mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
3034 lines
70 KiB
3034 lines
70 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (C) 2007 Casey Schaufler <[email protected]> |
|
* |
|
* Authors: |
|
* Casey Schaufler <[email protected]> |
|
* Ahmed S. Darwish <[email protected]> |
|
* |
|
* Special thanks to the authors of selinuxfs. |
|
* |
|
* Karl MacMillan <[email protected]> |
|
* James Morris <[email protected]> |
|
*/ |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/vmalloc.h> |
|
#include <linux/security.h> |
|
#include <linux/mutex.h> |
|
#include <linux/slab.h> |
|
#include <net/net_namespace.h> |
|
#include <net/cipso_ipv4.h> |
|
#include <linux/seq_file.h> |
|
#include <linux/ctype.h> |
|
#include <linux/audit.h> |
|
#include <linux/magic.h> |
|
#include <linux/fs_context.h> |
|
#include "smack.h" |
|
|
|
#define BEBITS (sizeof(__be32) * 8) |
|
/* |
|
* smackfs pseudo filesystem. |
|
*/ |
|
|
|
enum smk_inos { |
|
SMK_ROOT_INO = 2, |
|
SMK_LOAD = 3, /* load policy */ |
|
SMK_CIPSO = 4, /* load label -> CIPSO mapping */ |
|
SMK_DOI = 5, /* CIPSO DOI */ |
|
SMK_DIRECT = 6, /* CIPSO level indicating direct label */ |
|
SMK_AMBIENT = 7, /* internet ambient label */ |
|
SMK_NET4ADDR = 8, /* single label hosts */ |
|
SMK_ONLYCAP = 9, /* the only "capable" label */ |
|
SMK_LOGGING = 10, /* logging */ |
|
SMK_LOAD_SELF = 11, /* task specific rules */ |
|
SMK_ACCESSES = 12, /* access policy */ |
|
SMK_MAPPED = 13, /* CIPSO level indicating mapped label */ |
|
SMK_LOAD2 = 14, /* load policy with long labels */ |
|
SMK_LOAD_SELF2 = 15, /* load task specific rules with long labels */ |
|
SMK_ACCESS2 = 16, /* make an access check with long labels */ |
|
SMK_CIPSO2 = 17, /* load long label -> CIPSO mapping */ |
|
SMK_REVOKE_SUBJ = 18, /* set rules with subject label to '-' */ |
|
SMK_CHANGE_RULE = 19, /* change or add rules (long labels) */ |
|
SMK_SYSLOG = 20, /* change syslog label) */ |
|
SMK_PTRACE = 21, /* set ptrace rule */ |
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP |
|
SMK_UNCONFINED = 22, /* define an unconfined label */ |
|
#endif |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
SMK_NET6ADDR = 23, /* single label IPv6 hosts */ |
|
#endif /* CONFIG_IPV6 */ |
|
SMK_RELABEL_SELF = 24, /* relabel possible without CAP_MAC_ADMIN */ |
|
}; |
|
|
|
/* |
|
* List locks |
|
*/ |
|
static DEFINE_MUTEX(smack_cipso_lock); |
|
static DEFINE_MUTEX(smack_ambient_lock); |
|
static DEFINE_MUTEX(smk_net4addr_lock); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
static DEFINE_MUTEX(smk_net6addr_lock); |
|
#endif /* CONFIG_IPV6 */ |
|
|
|
/* |
|
* This is the "ambient" label for network traffic. |
|
* If it isn't somehow marked, use this. |
|
* It can be reset via smackfs/ambient |
|
*/ |
|
struct smack_known *smack_net_ambient; |
|
|
|
/* |
|
* This is the level in a CIPSO header that indicates a |
|
* smack label is contained directly in the category set. |
|
* It can be reset via smackfs/direct |
|
*/ |
|
int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; |
|
|
|
/* |
|
* This is the level in a CIPSO header that indicates a |
|
* secid is contained directly in the category set. |
|
* It can be reset via smackfs/mapped |
|
*/ |
|
int smack_cipso_mapped = SMACK_CIPSO_MAPPED_DEFAULT; |
|
|
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP |
|
/* |
|
* Allow one label to be unconfined. This is for |
|
* debugging and application bring-up purposes only. |
|
* It is bad and wrong, but everyone seems to expect |
|
* to have it. |
|
*/ |
|
struct smack_known *smack_unconfined; |
|
#endif |
|
|
|
/* |
|
* If this value is set restrict syslog use to the label specified. |
|
* It can be reset via smackfs/syslog |
|
*/ |
|
struct smack_known *smack_syslog_label; |
|
|
|
/* |
|
* Ptrace current rule |
|
* SMACK_PTRACE_DEFAULT regular smack ptrace rules (/proc based) |
|
* SMACK_PTRACE_EXACT labels must match, but can be overriden with |
|
* CAP_SYS_PTRACE |
|
* SMACK_PTRACE_DRACONIAN lables must match, CAP_SYS_PTRACE has no effect |
|
*/ |
|
int smack_ptrace_rule = SMACK_PTRACE_DEFAULT; |
|
|
|
/* |
|
* Certain IP addresses may be designated as single label hosts. |
|
* Packets are sent there unlabeled, but only from tasks that |
|
* can write to the specified label. |
|
*/ |
|
|
|
LIST_HEAD(smk_net4addr_list); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
LIST_HEAD(smk_net6addr_list); |
|
#endif /* CONFIG_IPV6 */ |
|
|
|
/* |
|
* Rule lists are maintained for each label. |
|
*/ |
|
struct smack_parsed_rule { |
|
struct smack_known *smk_subject; |
|
struct smack_known *smk_object; |
|
int smk_access1; |
|
int smk_access2; |
|
}; |
|
|
|
static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; |
|
|
|
/* |
|
* Values for parsing cipso rules |
|
* SMK_DIGITLEN: Length of a digit field in a rule. |
|
* SMK_CIPSOMIN: Minimum possible cipso rule length. |
|
* SMK_CIPSOMAX: Maximum possible cipso rule length. |
|
*/ |
|
#define SMK_DIGITLEN 4 |
|
#define SMK_CIPSOMIN (SMK_LABELLEN + 2 * SMK_DIGITLEN) |
|
#define SMK_CIPSOMAX (SMK_CIPSOMIN + SMACK_CIPSO_MAXCATNUM * SMK_DIGITLEN) |
|
|
|
/* |
|
* Values for parsing MAC rules |
|
* SMK_ACCESS: Maximum possible combination of access permissions |
|
* SMK_ACCESSLEN: Maximum length for a rule access field |
|
* SMK_LOADLEN: Smack rule length |
|
*/ |
|
#define SMK_OACCESS "rwxa" |
|
#define SMK_ACCESS "rwxatl" |
|
#define SMK_OACCESSLEN (sizeof(SMK_OACCESS) - 1) |
|
#define SMK_ACCESSLEN (sizeof(SMK_ACCESS) - 1) |
|
#define SMK_OLOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_OACCESSLEN) |
|
#define SMK_LOADLEN (SMK_LABELLEN + SMK_LABELLEN + SMK_ACCESSLEN) |
|
|
|
/* |
|
* Stricly for CIPSO level manipulation. |
|
* Set the category bit number in a smack label sized buffer. |
|
*/ |
|
static inline void smack_catset_bit(unsigned int cat, char *catsetp) |
|
{ |
|
if (cat == 0 || cat > (SMK_CIPSOLEN * 8)) |
|
return; |
|
|
|
catsetp[(cat - 1) / 8] |= 0x80 >> ((cat - 1) % 8); |
|
} |
|
|
|
/** |
|
* smk_netlabel_audit_set - fill a netlbl_audit struct |
|
* @nap: structure to fill |
|
*/ |
|
static void smk_netlabel_audit_set(struct netlbl_audit *nap) |
|
{ |
|
struct smack_known *skp = smk_of_current(); |
|
|
|
nap->loginuid = audit_get_loginuid(current); |
|
nap->sessionid = audit_get_sessionid(current); |
|
nap->secid = skp->smk_secid; |
|
} |
|
|
|
/* |
|
* Value for parsing single label host rules |
|
* "1.2.3.4 X" |
|
*/ |
|
#define SMK_NETLBLADDRMIN 9 |
|
|
|
/** |
|
* smk_set_access - add a rule to the rule list or replace an old rule |
|
* @srp: the rule to add or replace |
|
* @rule_list: the list of rules |
|
* @rule_lock: the rule list lock |
|
* |
|
* Looks through the current subject/object/access list for |
|
* the subject/object pair and replaces the access that was |
|
* there. If the pair isn't found add it with the specified |
|
* access. |
|
* |
|
* Returns 0 if nothing goes wrong or -ENOMEM if it fails |
|
* during the allocation of the new pair to add. |
|
*/ |
|
static int smk_set_access(struct smack_parsed_rule *srp, |
|
struct list_head *rule_list, |
|
struct mutex *rule_lock) |
|
{ |
|
struct smack_rule *sp; |
|
int found = 0; |
|
int rc = 0; |
|
|
|
mutex_lock(rule_lock); |
|
|
|
/* |
|
* Because the object label is less likely to match |
|
* than the subject label check it first |
|
*/ |
|
list_for_each_entry_rcu(sp, rule_list, list) { |
|
if (sp->smk_object == srp->smk_object && |
|
sp->smk_subject == srp->smk_subject) { |
|
found = 1; |
|
sp->smk_access |= srp->smk_access1; |
|
sp->smk_access &= ~srp->smk_access2; |
|
break; |
|
} |
|
} |
|
|
|
if (found == 0) { |
|
sp = kmem_cache_zalloc(smack_rule_cache, GFP_KERNEL); |
|
if (sp == NULL) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
sp->smk_subject = srp->smk_subject; |
|
sp->smk_object = srp->smk_object; |
|
sp->smk_access = srp->smk_access1 & ~srp->smk_access2; |
|
|
|
list_add_rcu(&sp->list, rule_list); |
|
} |
|
|
|
out: |
|
mutex_unlock(rule_lock); |
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_perm_from_str - parse smack accesses from a text string |
|
* @string: a text string that contains a Smack accesses code |
|
* |
|
* Returns an integer with respective bits set for specified accesses. |
|
*/ |
|
static int smk_perm_from_str(const char *string) |
|
{ |
|
int perm = 0; |
|
const char *cp; |
|
|
|
for (cp = string; ; cp++) |
|
switch (*cp) { |
|
case '-': |
|
break; |
|
case 'r': |
|
case 'R': |
|
perm |= MAY_READ; |
|
break; |
|
case 'w': |
|
case 'W': |
|
perm |= MAY_WRITE; |
|
break; |
|
case 'x': |
|
case 'X': |
|
perm |= MAY_EXEC; |
|
break; |
|
case 'a': |
|
case 'A': |
|
perm |= MAY_APPEND; |
|
break; |
|
case 't': |
|
case 'T': |
|
perm |= MAY_TRANSMUTE; |
|
break; |
|
case 'l': |
|
case 'L': |
|
perm |= MAY_LOCK; |
|
break; |
|
case 'b': |
|
case 'B': |
|
perm |= MAY_BRINGUP; |
|
break; |
|
default: |
|
return perm; |
|
} |
|
} |
|
|
|
/** |
|
* smk_fill_rule - Fill Smack rule from strings |
|
* @subject: subject label string |
|
* @object: object label string |
|
* @access1: access string |
|
* @access2: string with permissions to be removed |
|
* @rule: Smack rule |
|
* @import: if non-zero, import labels |
|
* @len: label length limit |
|
* |
|
* Returns 0 on success, appropriate error code on failure. |
|
*/ |
|
static int smk_fill_rule(const char *subject, const char *object, |
|
const char *access1, const char *access2, |
|
struct smack_parsed_rule *rule, int import, |
|
int len) |
|
{ |
|
const char *cp; |
|
struct smack_known *skp; |
|
|
|
if (import) { |
|
rule->smk_subject = smk_import_entry(subject, len); |
|
if (IS_ERR(rule->smk_subject)) |
|
return PTR_ERR(rule->smk_subject); |
|
|
|
rule->smk_object = smk_import_entry(object, len); |
|
if (IS_ERR(rule->smk_object)) |
|
return PTR_ERR(rule->smk_object); |
|
} else { |
|
cp = smk_parse_smack(subject, len); |
|
if (IS_ERR(cp)) |
|
return PTR_ERR(cp); |
|
skp = smk_find_entry(cp); |
|
kfree(cp); |
|
if (skp == NULL) |
|
return -ENOENT; |
|
rule->smk_subject = skp; |
|
|
|
cp = smk_parse_smack(object, len); |
|
if (IS_ERR(cp)) |
|
return PTR_ERR(cp); |
|
skp = smk_find_entry(cp); |
|
kfree(cp); |
|
if (skp == NULL) |
|
return -ENOENT; |
|
rule->smk_object = skp; |
|
} |
|
|
|
rule->smk_access1 = smk_perm_from_str(access1); |
|
if (access2) |
|
rule->smk_access2 = smk_perm_from_str(access2); |
|
else |
|
rule->smk_access2 = ~rule->smk_access1; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* smk_parse_rule - parse Smack rule from load string |
|
* @data: string to be parsed whose size is SMK_LOADLEN |
|
* @rule: Smack rule |
|
* @import: if non-zero, import labels |
|
* |
|
* Returns 0 on success, -1 on errors. |
|
*/ |
|
static int smk_parse_rule(const char *data, struct smack_parsed_rule *rule, |
|
int import) |
|
{ |
|
int rc; |
|
|
|
rc = smk_fill_rule(data, data + SMK_LABELLEN, |
|
data + SMK_LABELLEN + SMK_LABELLEN, NULL, rule, |
|
import, SMK_LABELLEN); |
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_parse_long_rule - parse Smack rule from rule string |
|
* @data: string to be parsed, null terminated |
|
* @rule: Will be filled with Smack parsed rule |
|
* @import: if non-zero, import labels |
|
* @tokens: number of substrings expected in data |
|
* |
|
* Returns number of processed bytes on success, -ERRNO on failure. |
|
*/ |
|
static ssize_t smk_parse_long_rule(char *data, struct smack_parsed_rule *rule, |
|
int import, int tokens) |
|
{ |
|
ssize_t cnt = 0; |
|
char *tok[4]; |
|
int rc; |
|
int i; |
|
|
|
/* |
|
* Parsing the rule in-place, filling all white-spaces with '\0' |
|
*/ |
|
for (i = 0; i < tokens; ++i) { |
|
while (isspace(data[cnt])) |
|
data[cnt++] = '\0'; |
|
|
|
if (data[cnt] == '\0') |
|
/* Unexpected end of data */ |
|
return -EINVAL; |
|
|
|
tok[i] = data + cnt; |
|
|
|
while (data[cnt] && !isspace(data[cnt])) |
|
++cnt; |
|
} |
|
while (isspace(data[cnt])) |
|
data[cnt++] = '\0'; |
|
|
|
while (i < 4) |
|
tok[i++] = NULL; |
|
|
|
rc = smk_fill_rule(tok[0], tok[1], tok[2], tok[3], rule, import, 0); |
|
return rc == 0 ? cnt : rc; |
|
} |
|
|
|
#define SMK_FIXED24_FMT 0 /* Fixed 24byte label format */ |
|
#define SMK_LONG_FMT 1 /* Variable long label format */ |
|
#define SMK_CHANGE_FMT 2 /* Rule modification format */ |
|
/** |
|
* smk_write_rules_list - write() for any /smack rule file |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* @rule_list: the list of rules to write to |
|
* @rule_lock: lock for the rule list |
|
* @format: /smack/load or /smack/load2 or /smack/change-rule format. |
|
* |
|
* Get one smack access rule from above. |
|
* The format for SMK_LONG_FMT is: |
|
* "subject<whitespace>object<whitespace>access[<whitespace>...]" |
|
* The format for SMK_FIXED24_FMT is exactly: |
|
* "subject object rwxat" |
|
* The format for SMK_CHANGE_FMT is: |
|
* "subject<whitespace>object<whitespace> |
|
* acc_enable<whitespace>acc_disable[<whitespace>...]" |
|
*/ |
|
static ssize_t smk_write_rules_list(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos, |
|
struct list_head *rule_list, |
|
struct mutex *rule_lock, int format) |
|
{ |
|
struct smack_parsed_rule rule; |
|
char *data; |
|
int rc; |
|
int trunc = 0; |
|
int tokens; |
|
ssize_t cnt = 0; |
|
|
|
/* |
|
* No partial writes. |
|
* Enough data must be present. |
|
*/ |
|
if (*ppos != 0) |
|
return -EINVAL; |
|
|
|
if (format == SMK_FIXED24_FMT) { |
|
/* |
|
* Minor hack for backward compatibility |
|
*/ |
|
if (count < SMK_OLOADLEN || count > SMK_LOADLEN) |
|
return -EINVAL; |
|
} else { |
|
if (count >= PAGE_SIZE) { |
|
count = PAGE_SIZE - 1; |
|
trunc = 1; |
|
} |
|
} |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
/* |
|
* In case of parsing only part of user buf, |
|
* avoid having partial rule at the data buffer |
|
*/ |
|
if (trunc) { |
|
while (count > 0 && (data[count - 1] != '\n')) |
|
--count; |
|
if (count == 0) { |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
} |
|
|
|
data[count] = '\0'; |
|
tokens = (format == SMK_CHANGE_FMT ? 4 : 3); |
|
while (cnt < count) { |
|
if (format == SMK_FIXED24_FMT) { |
|
rc = smk_parse_rule(data, &rule, 1); |
|
if (rc < 0) |
|
goto out; |
|
cnt = count; |
|
} else { |
|
rc = smk_parse_long_rule(data + cnt, &rule, 1, tokens); |
|
if (rc < 0) |
|
goto out; |
|
if (rc == 0) { |
|
rc = -EINVAL; |
|
goto out; |
|
} |
|
cnt += rc; |
|
} |
|
|
|
if (rule_list == NULL) |
|
rc = smk_set_access(&rule, &rule.smk_subject->smk_rules, |
|
&rule.smk_subject->smk_rules_lock); |
|
else |
|
rc = smk_set_access(&rule, rule_list, rule_lock); |
|
|
|
if (rc) |
|
goto out; |
|
} |
|
|
|
rc = cnt; |
|
out: |
|
kfree(data); |
|
return rc; |
|
} |
|
|
|
/* |
|
* Core logic for smackfs seq list operations. |
|
*/ |
|
|
|
static void *smk_seq_start(struct seq_file *s, loff_t *pos, |
|
struct list_head *head) |
|
{ |
|
struct list_head *list; |
|
int i = *pos; |
|
|
|
rcu_read_lock(); |
|
for (list = rcu_dereference(list_next_rcu(head)); |
|
list != head; |
|
list = rcu_dereference(list_next_rcu(list))) { |
|
if (i-- == 0) |
|
return list; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static void *smk_seq_next(struct seq_file *s, void *v, loff_t *pos, |
|
struct list_head *head) |
|
{ |
|
struct list_head *list = v; |
|
|
|
++*pos; |
|
list = rcu_dereference(list_next_rcu(list)); |
|
|
|
return (list == head) ? NULL : list; |
|
} |
|
|
|
static void smk_seq_stop(struct seq_file *s, void *v) |
|
{ |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void smk_rule_show(struct seq_file *s, struct smack_rule *srp, int max) |
|
{ |
|
/* |
|
* Don't show any rules with label names too long for |
|
* interface file (/smack/load or /smack/load2) |
|
* because you should expect to be able to write |
|
* anything you read back. |
|
*/ |
|
if (strlen(srp->smk_subject->smk_known) >= max || |
|
strlen(srp->smk_object->smk_known) >= max) |
|
return; |
|
|
|
if (srp->smk_access == 0) |
|
return; |
|
|
|
seq_printf(s, "%s %s", |
|
srp->smk_subject->smk_known, |
|
srp->smk_object->smk_known); |
|
|
|
seq_putc(s, ' '); |
|
|
|
if (srp->smk_access & MAY_READ) |
|
seq_putc(s, 'r'); |
|
if (srp->smk_access & MAY_WRITE) |
|
seq_putc(s, 'w'); |
|
if (srp->smk_access & MAY_EXEC) |
|
seq_putc(s, 'x'); |
|
if (srp->smk_access & MAY_APPEND) |
|
seq_putc(s, 'a'); |
|
if (srp->smk_access & MAY_TRANSMUTE) |
|
seq_putc(s, 't'); |
|
if (srp->smk_access & MAY_LOCK) |
|
seq_putc(s, 'l'); |
|
if (srp->smk_access & MAY_BRINGUP) |
|
seq_putc(s, 'b'); |
|
|
|
seq_putc(s, '\n'); |
|
} |
|
|
|
/* |
|
* Seq_file read operations for /smack/load |
|
*/ |
|
|
|
static void *load2_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
return smk_seq_start(s, pos, &smack_known_list); |
|
} |
|
|
|
static void *load2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
return smk_seq_next(s, v, pos, &smack_known_list); |
|
} |
|
|
|
static int load_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_rule *srp; |
|
struct smack_known *skp = |
|
list_entry_rcu(list, struct smack_known, list); |
|
|
|
list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
|
smk_rule_show(s, srp, SMK_LABELLEN); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations load_seq_ops = { |
|
.start = load2_seq_start, |
|
.next = load2_seq_next, |
|
.show = load_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_load - open() for /smack/load |
|
* @inode: inode structure representing file |
|
* @file: "load" file pointer |
|
* |
|
* For reading, use load_seq_* seq_file reading operations. |
|
*/ |
|
static int smk_open_load(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &load_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_load - write() for /smack/load |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* |
|
*/ |
|
static ssize_t smk_write_load(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
/* |
|
* Must have privilege. |
|
* No partial writes. |
|
* Enough data must be present. |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
|
SMK_FIXED24_FMT); |
|
} |
|
|
|
static const struct file_operations smk_load_ops = { |
|
.open = smk_open_load, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_load, |
|
.release = seq_release, |
|
}; |
|
|
|
/** |
|
* smk_cipso_doi - initialize the CIPSO domain |
|
*/ |
|
static void smk_cipso_doi(void) |
|
{ |
|
int rc; |
|
struct cipso_v4_doi *doip; |
|
struct netlbl_audit nai; |
|
|
|
smk_netlabel_audit_set(&nai); |
|
|
|
rc = netlbl_cfg_map_del(NULL, PF_INET, NULL, NULL, &nai); |
|
if (rc != 0) |
|
printk(KERN_WARNING "%s:%d remove rc = %d\n", |
|
__func__, __LINE__, rc); |
|
|
|
doip = kmalloc(sizeof(struct cipso_v4_doi), GFP_KERNEL); |
|
if (doip == NULL) |
|
panic("smack: Failed to initialize cipso DOI.\n"); |
|
doip->map.std = NULL; |
|
doip->doi = smk_cipso_doi_value; |
|
doip->type = CIPSO_V4_MAP_PASS; |
|
doip->tags[0] = CIPSO_V4_TAG_RBITMAP; |
|
for (rc = 1; rc < CIPSO_V4_TAG_MAXCNT; rc++) |
|
doip->tags[rc] = CIPSO_V4_TAG_INVALID; |
|
|
|
rc = netlbl_cfg_cipsov4_add(doip, &nai); |
|
if (rc != 0) { |
|
printk(KERN_WARNING "%s:%d cipso add rc = %d\n", |
|
__func__, __LINE__, rc); |
|
kfree(doip); |
|
return; |
|
} |
|
rc = netlbl_cfg_cipsov4_map_add(doip->doi, NULL, NULL, NULL, &nai); |
|
if (rc != 0) { |
|
printk(KERN_WARNING "%s:%d map add rc = %d\n", |
|
__func__, __LINE__, rc); |
|
kfree(doip); |
|
return; |
|
} |
|
} |
|
|
|
/** |
|
* smk_unlbl_ambient - initialize the unlabeled domain |
|
* @oldambient: previous domain string |
|
*/ |
|
static void smk_unlbl_ambient(char *oldambient) |
|
{ |
|
int rc; |
|
struct netlbl_audit nai; |
|
|
|
smk_netlabel_audit_set(&nai); |
|
|
|
if (oldambient != NULL) { |
|
rc = netlbl_cfg_map_del(oldambient, PF_INET, NULL, NULL, &nai); |
|
if (rc != 0) |
|
printk(KERN_WARNING "%s:%d remove rc = %d\n", |
|
__func__, __LINE__, rc); |
|
} |
|
if (smack_net_ambient == NULL) |
|
smack_net_ambient = &smack_known_floor; |
|
|
|
rc = netlbl_cfg_unlbl_map_add(smack_net_ambient->smk_known, PF_INET, |
|
NULL, NULL, &nai); |
|
if (rc != 0) |
|
printk(KERN_WARNING "%s:%d add rc = %d\n", |
|
__func__, __LINE__, rc); |
|
} |
|
|
|
/* |
|
* Seq_file read operations for /smack/cipso |
|
*/ |
|
|
|
static void *cipso_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
return smk_seq_start(s, pos, &smack_known_list); |
|
} |
|
|
|
static void *cipso_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
return smk_seq_next(s, v, pos, &smack_known_list); |
|
} |
|
|
|
/* |
|
* Print cipso labels in format: |
|
* label level[/cat[,cat]] |
|
*/ |
|
static int cipso_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_known *skp = |
|
list_entry_rcu(list, struct smack_known, list); |
|
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
|
char sep = '/'; |
|
int i; |
|
|
|
/* |
|
* Don't show a label that could not have been set using |
|
* /smack/cipso. This is in support of the notion that |
|
* anything read from /smack/cipso ought to be writeable |
|
* to /smack/cipso. |
|
* |
|
* /smack/cipso2 should be used instead. |
|
*/ |
|
if (strlen(skp->smk_known) >= SMK_LABELLEN) |
|
return 0; |
|
|
|
seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
|
|
|
for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
|
i = netlbl_catmap_walk(cmp, i + 1)) { |
|
seq_printf(s, "%c%d", sep, i); |
|
sep = ','; |
|
} |
|
|
|
seq_putc(s, '\n'); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations cipso_seq_ops = { |
|
.start = cipso_seq_start, |
|
.next = cipso_seq_next, |
|
.show = cipso_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_cipso - open() for /smack/cipso |
|
* @inode: inode structure representing file |
|
* @file: "cipso" file pointer |
|
* |
|
* Connect our cipso_seq_* operations with /smack/cipso |
|
* file_operations |
|
*/ |
|
static int smk_open_cipso(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &cipso_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_set_cipso - do the work for write() for cipso and cipso2 |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* @format: /smack/cipso or /smack/cipso2 |
|
* |
|
* Accepts only one cipso rule per write call. |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_set_cipso(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos, int format) |
|
{ |
|
struct smack_known *skp; |
|
struct netlbl_lsm_secattr ncats; |
|
char mapcatset[SMK_CIPSOLEN]; |
|
int maplevel; |
|
unsigned int cat; |
|
int catlen; |
|
ssize_t rc = -EINVAL; |
|
char *data = NULL; |
|
char *rule; |
|
int ret; |
|
int i; |
|
|
|
/* |
|
* Must have privilege. |
|
* No partial writes. |
|
* Enough data must be present. |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
if (*ppos != 0) |
|
return -EINVAL; |
|
if (format == SMK_FIXED24_FMT && |
|
(count < SMK_CIPSOMIN || count > SMK_CIPSOMAX)) |
|
return -EINVAL; |
|
if (count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
rule = data; |
|
/* |
|
* Only allow one writer at a time. Writes should be |
|
* quite rare and small in any case. |
|
*/ |
|
mutex_lock(&smack_cipso_lock); |
|
|
|
skp = smk_import_entry(rule, 0); |
|
if (IS_ERR(skp)) { |
|
rc = PTR_ERR(skp); |
|
goto out; |
|
} |
|
|
|
if (format == SMK_FIXED24_FMT) |
|
rule += SMK_LABELLEN; |
|
else |
|
rule += strlen(skp->smk_known) + 1; |
|
|
|
if (rule > data + count) { |
|
rc = -EOVERFLOW; |
|
goto out; |
|
} |
|
|
|
ret = sscanf(rule, "%d", &maplevel); |
|
if (ret != 1 || maplevel < 0 || maplevel > SMACK_CIPSO_MAXLEVEL) |
|
goto out; |
|
|
|
rule += SMK_DIGITLEN; |
|
if (rule > data + count) { |
|
rc = -EOVERFLOW; |
|
goto out; |
|
} |
|
|
|
ret = sscanf(rule, "%d", &catlen); |
|
if (ret != 1 || catlen > SMACK_CIPSO_MAXCATNUM) |
|
goto out; |
|
|
|
if (format == SMK_FIXED24_FMT && |
|
count != (SMK_CIPSOMIN + catlen * SMK_DIGITLEN)) |
|
goto out; |
|
|
|
memset(mapcatset, 0, sizeof(mapcatset)); |
|
|
|
for (i = 0; i < catlen; i++) { |
|
rule += SMK_DIGITLEN; |
|
if (rule > data + count) { |
|
rc = -EOVERFLOW; |
|
goto out; |
|
} |
|
ret = sscanf(rule, "%u", &cat); |
|
if (ret != 1 || cat > SMACK_CIPSO_MAXCATNUM) |
|
goto out; |
|
|
|
smack_catset_bit(cat, mapcatset); |
|
} |
|
|
|
rc = smk_netlbl_mls(maplevel, mapcatset, &ncats, SMK_CIPSOLEN); |
|
if (rc >= 0) { |
|
netlbl_catmap_free(skp->smk_netlabel.attr.mls.cat); |
|
skp->smk_netlabel.attr.mls.cat = ncats.attr.mls.cat; |
|
skp->smk_netlabel.attr.mls.lvl = ncats.attr.mls.lvl; |
|
rc = count; |
|
/* |
|
* This mapping may have been cached, so clear the cache. |
|
*/ |
|
netlbl_cache_invalidate(); |
|
} |
|
|
|
out: |
|
mutex_unlock(&smack_cipso_lock); |
|
kfree(data); |
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_cipso - write() for /smack/cipso |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Accepts only one cipso rule per write call. |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_cipso(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
return smk_set_cipso(file, buf, count, ppos, SMK_FIXED24_FMT); |
|
} |
|
|
|
static const struct file_operations smk_cipso_ops = { |
|
.open = smk_open_cipso, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_cipso, |
|
.release = seq_release, |
|
}; |
|
|
|
/* |
|
* Seq_file read operations for /smack/cipso2 |
|
*/ |
|
|
|
/* |
|
* Print cipso labels in format: |
|
* label level[/cat[,cat]] |
|
*/ |
|
static int cipso2_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_known *skp = |
|
list_entry_rcu(list, struct smack_known, list); |
|
struct netlbl_lsm_catmap *cmp = skp->smk_netlabel.attr.mls.cat; |
|
char sep = '/'; |
|
int i; |
|
|
|
seq_printf(s, "%s %3d", skp->smk_known, skp->smk_netlabel.attr.mls.lvl); |
|
|
|
for (i = netlbl_catmap_walk(cmp, 0); i >= 0; |
|
i = netlbl_catmap_walk(cmp, i + 1)) { |
|
seq_printf(s, "%c%d", sep, i); |
|
sep = ','; |
|
} |
|
|
|
seq_putc(s, '\n'); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations cipso2_seq_ops = { |
|
.start = cipso_seq_start, |
|
.next = cipso_seq_next, |
|
.show = cipso2_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_cipso2 - open() for /smack/cipso2 |
|
* @inode: inode structure representing file |
|
* @file: "cipso2" file pointer |
|
* |
|
* Connect our cipso_seq_* operations with /smack/cipso2 |
|
* file_operations |
|
*/ |
|
static int smk_open_cipso2(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &cipso2_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_cipso2 - write() for /smack/cipso2 |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Accepts only one cipso rule per write call. |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_cipso2(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
return smk_set_cipso(file, buf, count, ppos, SMK_LONG_FMT); |
|
} |
|
|
|
static const struct file_operations smk_cipso2_ops = { |
|
.open = smk_open_cipso2, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_cipso2, |
|
.release = seq_release, |
|
}; |
|
|
|
/* |
|
* Seq_file read operations for /smack/netlabel |
|
*/ |
|
|
|
static void *net4addr_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
return smk_seq_start(s, pos, &smk_net4addr_list); |
|
} |
|
|
|
static void *net4addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
return smk_seq_next(s, v, pos, &smk_net4addr_list); |
|
} |
|
|
|
/* |
|
* Print host/label pairs |
|
*/ |
|
static int net4addr_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smk_net4addr *skp = |
|
list_entry_rcu(list, struct smk_net4addr, list); |
|
char *kp = SMACK_CIPSO_OPTION; |
|
|
|
if (skp->smk_label != NULL) |
|
kp = skp->smk_label->smk_known; |
|
seq_printf(s, "%pI4/%d %s\n", &skp->smk_host.s_addr, |
|
skp->smk_masks, kp); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations net4addr_seq_ops = { |
|
.start = net4addr_seq_start, |
|
.next = net4addr_seq_next, |
|
.show = net4addr_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_net4addr - open() for /smack/netlabel |
|
* @inode: inode structure representing file |
|
* @file: "netlabel" file pointer |
|
* |
|
* Connect our net4addr_seq_* operations with /smack/netlabel |
|
* file_operations |
|
*/ |
|
static int smk_open_net4addr(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &net4addr_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_net4addr_insert |
|
* @new : netlabel to insert |
|
* |
|
* This helper insert netlabel in the smack_net4addrs list |
|
* sorted by netmask length (longest to smallest) |
|
* locked by &smk_net4addr_lock in smk_write_net4addr |
|
* |
|
*/ |
|
static void smk_net4addr_insert(struct smk_net4addr *new) |
|
{ |
|
struct smk_net4addr *m; |
|
struct smk_net4addr *m_next; |
|
|
|
if (list_empty(&smk_net4addr_list)) { |
|
list_add_rcu(&new->list, &smk_net4addr_list); |
|
return; |
|
} |
|
|
|
m = list_entry_rcu(smk_net4addr_list.next, |
|
struct smk_net4addr, list); |
|
|
|
/* the comparison '>' is a bit hacky, but works */ |
|
if (new->smk_masks > m->smk_masks) { |
|
list_add_rcu(&new->list, &smk_net4addr_list); |
|
return; |
|
} |
|
|
|
list_for_each_entry_rcu(m, &smk_net4addr_list, list) { |
|
if (list_is_last(&m->list, &smk_net4addr_list)) { |
|
list_add_rcu(&new->list, &m->list); |
|
return; |
|
} |
|
m_next = list_entry_rcu(m->list.next, |
|
struct smk_net4addr, list); |
|
if (new->smk_masks > m_next->smk_masks) { |
|
list_add_rcu(&new->list, &m->list); |
|
return; |
|
} |
|
} |
|
} |
|
|
|
|
|
/** |
|
* smk_write_net4addr - write() for /smack/netlabel |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Accepts only one net4addr per write call. |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_net4addr(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct smk_net4addr *snp; |
|
struct sockaddr_in newname; |
|
char *smack; |
|
struct smack_known *skp = NULL; |
|
char *data; |
|
char *host = (char *)&newname.sin_addr.s_addr; |
|
int rc; |
|
struct netlbl_audit audit_info; |
|
struct in_addr mask; |
|
unsigned int m; |
|
unsigned int masks; |
|
int found; |
|
u32 mask_bits = (1<<31); |
|
__be32 nsa; |
|
u32 temp_mask; |
|
|
|
/* |
|
* Must have privilege. |
|
* No partial writes. |
|
* Enough data must be present. |
|
* "<addr/mask, as a.b.c.d/e><space><label>" |
|
* "<addr, as a.b.c.d><space><label>" |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
if (*ppos != 0) |
|
return -EINVAL; |
|
if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
smack = kzalloc(count + 1, GFP_KERNEL); |
|
if (smack == NULL) { |
|
rc = -ENOMEM; |
|
goto free_data_out; |
|
} |
|
|
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd/%u %s", |
|
&host[0], &host[1], &host[2], &host[3], &masks, smack); |
|
if (rc != 6) { |
|
rc = sscanf(data, "%hhd.%hhd.%hhd.%hhd %s", |
|
&host[0], &host[1], &host[2], &host[3], smack); |
|
if (rc != 5) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
m = BEBITS; |
|
masks = 32; |
|
} |
|
if (masks > BEBITS) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
|
|
/* |
|
* If smack begins with '-', it is an option, don't import it |
|
*/ |
|
if (smack[0] != '-') { |
|
skp = smk_import_entry(smack, 0); |
|
if (IS_ERR(skp)) { |
|
rc = PTR_ERR(skp); |
|
goto free_out; |
|
} |
|
} else { |
|
/* |
|
* Only the -CIPSO option is supported for IPv4 |
|
*/ |
|
if (strcmp(smack, SMACK_CIPSO_OPTION) != 0) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
} |
|
|
|
for (m = masks, temp_mask = 0; m > 0; m--) { |
|
temp_mask |= mask_bits; |
|
mask_bits >>= 1; |
|
} |
|
mask.s_addr = cpu_to_be32(temp_mask); |
|
|
|
newname.sin_addr.s_addr &= mask.s_addr; |
|
/* |
|
* Only allow one writer at a time. Writes should be |
|
* quite rare and small in any case. |
|
*/ |
|
mutex_lock(&smk_net4addr_lock); |
|
|
|
nsa = newname.sin_addr.s_addr; |
|
/* try to find if the prefix is already in the list */ |
|
found = 0; |
|
list_for_each_entry_rcu(snp, &smk_net4addr_list, list) { |
|
if (snp->smk_host.s_addr == nsa && snp->smk_masks == masks) { |
|
found = 1; |
|
break; |
|
} |
|
} |
|
smk_netlabel_audit_set(&audit_info); |
|
|
|
if (found == 0) { |
|
snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
|
if (snp == NULL) |
|
rc = -ENOMEM; |
|
else { |
|
rc = 0; |
|
snp->smk_host.s_addr = newname.sin_addr.s_addr; |
|
snp->smk_mask.s_addr = mask.s_addr; |
|
snp->smk_label = skp; |
|
snp->smk_masks = masks; |
|
smk_net4addr_insert(snp); |
|
} |
|
} else { |
|
/* |
|
* Delete the unlabeled entry, only if the previous label |
|
* wasn't the special CIPSO option |
|
*/ |
|
if (snp->smk_label != NULL) |
|
rc = netlbl_cfg_unlbl_static_del(&init_net, NULL, |
|
&snp->smk_host, &snp->smk_mask, |
|
PF_INET, &audit_info); |
|
else |
|
rc = 0; |
|
snp->smk_label = skp; |
|
} |
|
|
|
/* |
|
* Now tell netlabel about the single label nature of |
|
* this host so that incoming packets get labeled. |
|
* but only if we didn't get the special CIPSO option |
|
*/ |
|
if (rc == 0 && skp != NULL) |
|
rc = netlbl_cfg_unlbl_static_add(&init_net, NULL, |
|
&snp->smk_host, &snp->smk_mask, PF_INET, |
|
snp->smk_label->smk_secid, &audit_info); |
|
|
|
if (rc == 0) |
|
rc = count; |
|
|
|
mutex_unlock(&smk_net4addr_lock); |
|
|
|
free_out: |
|
kfree(smack); |
|
free_data_out: |
|
kfree(data); |
|
|
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_net4addr_ops = { |
|
.open = smk_open_net4addr, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_net4addr, |
|
.release = seq_release, |
|
}; |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
/* |
|
* Seq_file read operations for /smack/netlabel6 |
|
*/ |
|
|
|
static void *net6addr_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
return smk_seq_start(s, pos, &smk_net6addr_list); |
|
} |
|
|
|
static void *net6addr_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
return smk_seq_next(s, v, pos, &smk_net6addr_list); |
|
} |
|
|
|
/* |
|
* Print host/label pairs |
|
*/ |
|
static int net6addr_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smk_net6addr *skp = |
|
list_entry(list, struct smk_net6addr, list); |
|
|
|
if (skp->smk_label != NULL) |
|
seq_printf(s, "%pI6/%d %s\n", &skp->smk_host, skp->smk_masks, |
|
skp->smk_label->smk_known); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations net6addr_seq_ops = { |
|
.start = net6addr_seq_start, |
|
.next = net6addr_seq_next, |
|
.show = net6addr_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_net6addr - open() for /smack/netlabel |
|
* @inode: inode structure representing file |
|
* @file: "netlabel" file pointer |
|
* |
|
* Connect our net6addr_seq_* operations with /smack/netlabel |
|
* file_operations |
|
*/ |
|
static int smk_open_net6addr(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &net6addr_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_net6addr_insert |
|
* @new : entry to insert |
|
* |
|
* This inserts an entry in the smack_net6addrs list |
|
* sorted by netmask length (longest to smallest) |
|
* locked by &smk_net6addr_lock in smk_write_net6addr |
|
* |
|
*/ |
|
static void smk_net6addr_insert(struct smk_net6addr *new) |
|
{ |
|
struct smk_net6addr *m_next; |
|
struct smk_net6addr *m; |
|
|
|
if (list_empty(&smk_net6addr_list)) { |
|
list_add_rcu(&new->list, &smk_net6addr_list); |
|
return; |
|
} |
|
|
|
m = list_entry_rcu(smk_net6addr_list.next, |
|
struct smk_net6addr, list); |
|
|
|
if (new->smk_masks > m->smk_masks) { |
|
list_add_rcu(&new->list, &smk_net6addr_list); |
|
return; |
|
} |
|
|
|
list_for_each_entry_rcu(m, &smk_net6addr_list, list) { |
|
if (list_is_last(&m->list, &smk_net6addr_list)) { |
|
list_add_rcu(&new->list, &m->list); |
|
return; |
|
} |
|
m_next = list_entry_rcu(m->list.next, |
|
struct smk_net6addr, list); |
|
if (new->smk_masks > m_next->smk_masks) { |
|
list_add_rcu(&new->list, &m->list); |
|
return; |
|
} |
|
} |
|
} |
|
|
|
|
|
/** |
|
* smk_write_net6addr - write() for /smack/netlabel |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Accepts only one net6addr per write call. |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_net6addr(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct smk_net6addr *snp; |
|
struct in6_addr newname; |
|
struct in6_addr fullmask; |
|
struct smack_known *skp = NULL; |
|
char *smack; |
|
char *data; |
|
int rc = 0; |
|
int found = 0; |
|
int i; |
|
unsigned int scanned[8]; |
|
unsigned int m; |
|
unsigned int mask = 128; |
|
|
|
/* |
|
* Must have privilege. |
|
* No partial writes. |
|
* Enough data must be present. |
|
* "<addr/mask, as a:b:c:d:e:f:g:h/e><space><label>" |
|
* "<addr, as a:b:c:d:e:f:g:h><space><label>" |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
if (*ppos != 0) |
|
return -EINVAL; |
|
if (count < SMK_NETLBLADDRMIN || count > PAGE_SIZE - 1) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
smack = kzalloc(count + 1, GFP_KERNEL); |
|
if (smack == NULL) { |
|
rc = -ENOMEM; |
|
goto free_data_out; |
|
} |
|
|
|
i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x/%u %s", |
|
&scanned[0], &scanned[1], &scanned[2], &scanned[3], |
|
&scanned[4], &scanned[5], &scanned[6], &scanned[7], |
|
&mask, smack); |
|
if (i != 10) { |
|
i = sscanf(data, "%x:%x:%x:%x:%x:%x:%x:%x %s", |
|
&scanned[0], &scanned[1], &scanned[2], |
|
&scanned[3], &scanned[4], &scanned[5], |
|
&scanned[6], &scanned[7], smack); |
|
if (i != 9) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
} |
|
if (mask > 128) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
for (i = 0; i < 8; i++) { |
|
if (scanned[i] > 0xffff) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
newname.s6_addr16[i] = htons(scanned[i]); |
|
} |
|
|
|
/* |
|
* If smack begins with '-', it is an option, don't import it |
|
*/ |
|
if (smack[0] != '-') { |
|
skp = smk_import_entry(smack, 0); |
|
if (IS_ERR(skp)) { |
|
rc = PTR_ERR(skp); |
|
goto free_out; |
|
} |
|
} else { |
|
/* |
|
* Only -DELETE is supported for IPv6 |
|
*/ |
|
if (strcmp(smack, SMACK_DELETE_OPTION) != 0) { |
|
rc = -EINVAL; |
|
goto free_out; |
|
} |
|
} |
|
|
|
for (i = 0, m = mask; i < 8; i++) { |
|
if (m >= 16) { |
|
fullmask.s6_addr16[i] = 0xffff; |
|
m -= 16; |
|
} else if (m > 0) { |
|
fullmask.s6_addr16[i] = (1 << m) - 1; |
|
m = 0; |
|
} else |
|
fullmask.s6_addr16[i] = 0; |
|
newname.s6_addr16[i] &= fullmask.s6_addr16[i]; |
|
} |
|
|
|
/* |
|
* Only allow one writer at a time. Writes should be |
|
* quite rare and small in any case. |
|
*/ |
|
mutex_lock(&smk_net6addr_lock); |
|
/* |
|
* Try to find the prefix in the list |
|
*/ |
|
list_for_each_entry_rcu(snp, &smk_net6addr_list, list) { |
|
if (mask != snp->smk_masks) |
|
continue; |
|
for (found = 1, i = 0; i < 8; i++) { |
|
if (newname.s6_addr16[i] != |
|
snp->smk_host.s6_addr16[i]) { |
|
found = 0; |
|
break; |
|
} |
|
} |
|
if (found == 1) |
|
break; |
|
} |
|
if (found == 0) { |
|
snp = kzalloc(sizeof(*snp), GFP_KERNEL); |
|
if (snp == NULL) |
|
rc = -ENOMEM; |
|
else { |
|
snp->smk_host = newname; |
|
snp->smk_mask = fullmask; |
|
snp->smk_masks = mask; |
|
snp->smk_label = skp; |
|
smk_net6addr_insert(snp); |
|
} |
|
} else { |
|
snp->smk_label = skp; |
|
} |
|
|
|
if (rc == 0) |
|
rc = count; |
|
|
|
mutex_unlock(&smk_net6addr_lock); |
|
|
|
free_out: |
|
kfree(smack); |
|
free_data_out: |
|
kfree(data); |
|
|
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_net6addr_ops = { |
|
.open = smk_open_net6addr, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_net6addr, |
|
.release = seq_release, |
|
}; |
|
#endif /* CONFIG_IPV6 */ |
|
|
|
/** |
|
* smk_read_doi - read() for /smack/doi |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @count: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_doi(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[80]; |
|
ssize_t rc; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
sprintf(temp, "%d", smk_cipso_doi_value); |
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_doi - write() for /smack/doi |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_doi(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[80]; |
|
int i; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count >= sizeof(temp) || count == 0) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(temp, buf, count) != 0) |
|
return -EFAULT; |
|
|
|
temp[count] = '\0'; |
|
|
|
if (sscanf(temp, "%d", &i) != 1) |
|
return -EINVAL; |
|
|
|
smk_cipso_doi_value = i; |
|
|
|
smk_cipso_doi(); |
|
|
|
return count; |
|
} |
|
|
|
static const struct file_operations smk_doi_ops = { |
|
.read = smk_read_doi, |
|
.write = smk_write_doi, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* smk_read_direct - read() for /smack/direct |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @count: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_direct(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[80]; |
|
ssize_t rc; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
sprintf(temp, "%d", smack_cipso_direct); |
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_direct - write() for /smack/direct |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_direct(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct smack_known *skp; |
|
char temp[80]; |
|
int i; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count >= sizeof(temp) || count == 0) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(temp, buf, count) != 0) |
|
return -EFAULT; |
|
|
|
temp[count] = '\0'; |
|
|
|
if (sscanf(temp, "%d", &i) != 1) |
|
return -EINVAL; |
|
|
|
/* |
|
* Don't do anything if the value hasn't actually changed. |
|
* If it is changing reset the level on entries that were |
|
* set up to be direct when they were created. |
|
*/ |
|
if (smack_cipso_direct != i) { |
|
mutex_lock(&smack_known_lock); |
|
list_for_each_entry_rcu(skp, &smack_known_list, list) |
|
if (skp->smk_netlabel.attr.mls.lvl == |
|
smack_cipso_direct) |
|
skp->smk_netlabel.attr.mls.lvl = i; |
|
smack_cipso_direct = i; |
|
mutex_unlock(&smack_known_lock); |
|
} |
|
|
|
return count; |
|
} |
|
|
|
static const struct file_operations smk_direct_ops = { |
|
.read = smk_read_direct, |
|
.write = smk_write_direct, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* smk_read_mapped - read() for /smack/mapped |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @count: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_mapped(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[80]; |
|
ssize_t rc; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
sprintf(temp, "%d", smack_cipso_mapped); |
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_mapped - write() for /smack/mapped |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_mapped(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct smack_known *skp; |
|
char temp[80]; |
|
int i; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count >= sizeof(temp) || count == 0) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(temp, buf, count) != 0) |
|
return -EFAULT; |
|
|
|
temp[count] = '\0'; |
|
|
|
if (sscanf(temp, "%d", &i) != 1) |
|
return -EINVAL; |
|
|
|
/* |
|
* Don't do anything if the value hasn't actually changed. |
|
* If it is changing reset the level on entries that were |
|
* set up to be mapped when they were created. |
|
*/ |
|
if (smack_cipso_mapped != i) { |
|
mutex_lock(&smack_known_lock); |
|
list_for_each_entry_rcu(skp, &smack_known_list, list) |
|
if (skp->smk_netlabel.attr.mls.lvl == |
|
smack_cipso_mapped) |
|
skp->smk_netlabel.attr.mls.lvl = i; |
|
smack_cipso_mapped = i; |
|
mutex_unlock(&smack_known_lock); |
|
} |
|
|
|
return count; |
|
} |
|
|
|
static const struct file_operations smk_mapped_ops = { |
|
.read = smk_read_mapped, |
|
.write = smk_write_mapped, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* smk_read_ambient - read() for /smack/ambient |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @cn: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_ambient(struct file *filp, char __user *buf, |
|
size_t cn, loff_t *ppos) |
|
{ |
|
ssize_t rc; |
|
int asize; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
/* |
|
* Being careful to avoid a problem in the case where |
|
* smack_net_ambient gets changed in midstream. |
|
*/ |
|
mutex_lock(&smack_ambient_lock); |
|
|
|
asize = strlen(smack_net_ambient->smk_known) + 1; |
|
|
|
if (cn >= asize) |
|
rc = simple_read_from_buffer(buf, cn, ppos, |
|
smack_net_ambient->smk_known, |
|
asize); |
|
else |
|
rc = -EINVAL; |
|
|
|
mutex_unlock(&smack_ambient_lock); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_ambient - write() for /smack/ambient |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_ambient(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct smack_known *skp; |
|
char *oldambient; |
|
char *data; |
|
int rc = count; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
/* Enough data must be present */ |
|
if (count == 0 || count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
skp = smk_import_entry(data, count); |
|
if (IS_ERR(skp)) { |
|
rc = PTR_ERR(skp); |
|
goto out; |
|
} |
|
|
|
mutex_lock(&smack_ambient_lock); |
|
|
|
oldambient = smack_net_ambient->smk_known; |
|
smack_net_ambient = skp; |
|
smk_unlbl_ambient(oldambient); |
|
|
|
mutex_unlock(&smack_ambient_lock); |
|
|
|
out: |
|
kfree(data); |
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_ambient_ops = { |
|
.read = smk_read_ambient, |
|
.write = smk_write_ambient, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/* |
|
* Seq_file operations for /smack/onlycap |
|
*/ |
|
static void *onlycap_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
return smk_seq_start(s, pos, &smack_onlycap_list); |
|
} |
|
|
|
static void *onlycap_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
return smk_seq_next(s, v, pos, &smack_onlycap_list); |
|
} |
|
|
|
static int onlycap_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_known_list_elem *sklep = |
|
list_entry_rcu(list, struct smack_known_list_elem, list); |
|
|
|
seq_puts(s, sklep->smk_label->smk_known); |
|
seq_putc(s, ' '); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations onlycap_seq_ops = { |
|
.start = onlycap_seq_start, |
|
.next = onlycap_seq_next, |
|
.show = onlycap_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
static int smk_open_onlycap(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &onlycap_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_list_swap_rcu - swap public list with a private one in RCU-safe way |
|
* The caller must hold appropriate mutex to prevent concurrent modifications |
|
* to the public list. |
|
* Private list is assumed to be not accessible to other threads yet. |
|
* |
|
* @public: public list |
|
* @private: private list |
|
*/ |
|
static void smk_list_swap_rcu(struct list_head *public, |
|
struct list_head *private) |
|
{ |
|
struct list_head *first, *last; |
|
|
|
if (list_empty(public)) { |
|
list_splice_init_rcu(private, public, synchronize_rcu); |
|
} else { |
|
/* Remember public list before replacing it */ |
|
first = public->next; |
|
last = public->prev; |
|
|
|
/* Publish private list in place of public in RCU-safe way */ |
|
private->prev->next = public; |
|
private->next->prev = public; |
|
rcu_assign_pointer(public->next, private->next); |
|
public->prev = private->prev; |
|
|
|
synchronize_rcu(); |
|
|
|
/* When all readers are done with the old public list, |
|
* attach it in place of private */ |
|
private->next = first; |
|
private->prev = last; |
|
first->prev = private; |
|
last->next = private; |
|
} |
|
} |
|
|
|
/** |
|
* smk_parse_label_list - parse list of Smack labels, separated by spaces |
|
* |
|
* @data: the string to parse |
|
* @list: destination list |
|
* |
|
* Returns zero on success or error code, as appropriate |
|
*/ |
|
static int smk_parse_label_list(char *data, struct list_head *list) |
|
{ |
|
char *tok; |
|
struct smack_known *skp; |
|
struct smack_known_list_elem *sklep; |
|
|
|
while ((tok = strsep(&data, " ")) != NULL) { |
|
if (!*tok) |
|
continue; |
|
|
|
skp = smk_import_entry(tok, 0); |
|
if (IS_ERR(skp)) |
|
return PTR_ERR(skp); |
|
|
|
sklep = kzalloc(sizeof(*sklep), GFP_KERNEL); |
|
if (sklep == NULL) |
|
return -ENOMEM; |
|
|
|
sklep->smk_label = skp; |
|
list_add(&sklep->list, list); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* smk_destroy_label_list - destroy a list of smack_known_list_elem |
|
* @list: header pointer of the list to destroy |
|
*/ |
|
void smk_destroy_label_list(struct list_head *list) |
|
{ |
|
struct smack_known_list_elem *sklep; |
|
struct smack_known_list_elem *sklep2; |
|
|
|
list_for_each_entry_safe(sklep, sklep2, list, list) |
|
kfree(sklep); |
|
|
|
INIT_LIST_HEAD(list); |
|
} |
|
|
|
/** |
|
* smk_write_onlycap - write() for smackfs/onlycap |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *data; |
|
LIST_HEAD(list_tmp); |
|
int rc; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
rc = smk_parse_label_list(data, &list_tmp); |
|
kfree(data); |
|
|
|
/* |
|
* Clear the smack_onlycap on invalid label errors. This means |
|
* that we can pass a null string to unset the onlycap value. |
|
* |
|
* Importing will also reject a label beginning with '-', |
|
* so "-usecapabilities" will also work. |
|
* |
|
* But do so only on invalid label, not on system errors. |
|
* The invalid label must be first to count as clearing attempt. |
|
*/ |
|
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
|
mutex_lock(&smack_onlycap_lock); |
|
smk_list_swap_rcu(&smack_onlycap_list, &list_tmp); |
|
mutex_unlock(&smack_onlycap_lock); |
|
rc = count; |
|
} |
|
|
|
smk_destroy_label_list(&list_tmp); |
|
|
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_onlycap_ops = { |
|
.open = smk_open_onlycap, |
|
.read = seq_read, |
|
.write = smk_write_onlycap, |
|
.llseek = seq_lseek, |
|
.release = seq_release, |
|
}; |
|
|
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP |
|
/** |
|
* smk_read_unconfined - read() for smackfs/unconfined |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @cn: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_unconfined(struct file *filp, char __user *buf, |
|
size_t cn, loff_t *ppos) |
|
{ |
|
char *smack = ""; |
|
ssize_t rc = -EINVAL; |
|
int asize; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
if (smack_unconfined != NULL) |
|
smack = smack_unconfined->smk_known; |
|
|
|
asize = strlen(smack) + 1; |
|
|
|
if (cn >= asize) |
|
rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_unconfined - write() for smackfs/unconfined |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_unconfined(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *data; |
|
struct smack_known *skp; |
|
int rc = count; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
/* |
|
* Clear the smack_unconfined on invalid label errors. This means |
|
* that we can pass a null string to unset the unconfined value. |
|
* |
|
* Importing will also reject a label beginning with '-', |
|
* so "-confine" will also work. |
|
* |
|
* But do so only on invalid label, not on system errors. |
|
*/ |
|
skp = smk_import_entry(data, count); |
|
if (PTR_ERR(skp) == -EINVAL) |
|
skp = NULL; |
|
else if (IS_ERR(skp)) { |
|
rc = PTR_ERR(skp); |
|
goto freeout; |
|
} |
|
|
|
smack_unconfined = skp; |
|
|
|
freeout: |
|
kfree(data); |
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_unconfined_ops = { |
|
.read = smk_read_unconfined, |
|
.write = smk_write_unconfined, |
|
.llseek = default_llseek, |
|
}; |
|
#endif /* CONFIG_SECURITY_SMACK_BRINGUP */ |
|
|
|
/** |
|
* smk_read_logging - read() for /smack/logging |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @count: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_logging(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[32]; |
|
ssize_t rc; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
sprintf(temp, "%d\n", log_policy); |
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_logging - write() for /smack/logging |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_logging(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[32]; |
|
int i; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count >= sizeof(temp) || count == 0) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(temp, buf, count) != 0) |
|
return -EFAULT; |
|
|
|
temp[count] = '\0'; |
|
|
|
if (sscanf(temp, "%d", &i) != 1) |
|
return -EINVAL; |
|
if (i < 0 || i > 3) |
|
return -EINVAL; |
|
log_policy = i; |
|
return count; |
|
} |
|
|
|
|
|
|
|
static const struct file_operations smk_logging_ops = { |
|
.read = smk_read_logging, |
|
.write = smk_write_logging, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/* |
|
* Seq_file read operations for /smack/load-self |
|
*/ |
|
|
|
static void *load_self_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_start(s, pos, &tsp->smk_rules); |
|
} |
|
|
|
static void *load_self_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_rules); |
|
} |
|
|
|
static int load_self_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_rule *srp = |
|
list_entry_rcu(list, struct smack_rule, list); |
|
|
|
smk_rule_show(s, srp, SMK_LABELLEN); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations load_self_seq_ops = { |
|
.start = load_self_seq_start, |
|
.next = load_self_seq_next, |
|
.show = load_self_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
|
|
/** |
|
* smk_open_load_self - open() for /smack/load-self2 |
|
* @inode: inode structure representing file |
|
* @file: "load" file pointer |
|
* |
|
* For reading, use load_seq_* seq_file reading operations. |
|
*/ |
|
static int smk_open_load_self(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &load_self_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_load_self - write() for /smack/load-self |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* |
|
*/ |
|
static ssize_t smk_write_load_self(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
|
&tsp->smk_rules_lock, SMK_FIXED24_FMT); |
|
} |
|
|
|
static const struct file_operations smk_load_self_ops = { |
|
.open = smk_open_load_self, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_load_self, |
|
.release = seq_release, |
|
}; |
|
|
|
/** |
|
* smk_user_access - handle access check transaction |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* @format: /smack/load or /smack/load2 or /smack/change-rule format. |
|
*/ |
|
static ssize_t smk_user_access(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos, int format) |
|
{ |
|
struct smack_parsed_rule rule; |
|
char *data; |
|
int res; |
|
|
|
data = simple_transaction_get(file, buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
if (format == SMK_FIXED24_FMT) { |
|
if (count < SMK_LOADLEN) |
|
return -EINVAL; |
|
res = smk_parse_rule(data, &rule, 0); |
|
} else { |
|
/* |
|
* simple_transaction_get() returns null-terminated data |
|
*/ |
|
res = smk_parse_long_rule(data, &rule, 0, 3); |
|
} |
|
|
|
if (res >= 0) |
|
res = smk_access(rule.smk_subject, rule.smk_object, |
|
rule.smk_access1, NULL); |
|
else if (res != -ENOENT) |
|
return res; |
|
|
|
/* |
|
* smk_access() can return a value > 0 in the "bringup" case. |
|
*/ |
|
data[0] = res >= 0 ? '1' : '0'; |
|
data[1] = '\0'; |
|
|
|
simple_transaction_set(file, 2); |
|
|
|
if (format == SMK_FIXED24_FMT) |
|
return SMK_LOADLEN; |
|
return count; |
|
} |
|
|
|
/** |
|
* smk_write_access - handle access check transaction |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
*/ |
|
static ssize_t smk_write_access(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
return smk_user_access(file, buf, count, ppos, SMK_FIXED24_FMT); |
|
} |
|
|
|
static const struct file_operations smk_access_ops = { |
|
.write = smk_write_access, |
|
.read = simple_transaction_read, |
|
.release = simple_transaction_release, |
|
.llseek = generic_file_llseek, |
|
}; |
|
|
|
|
|
/* |
|
* Seq_file read operations for /smack/load2 |
|
*/ |
|
|
|
static int load2_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_rule *srp; |
|
struct smack_known *skp = |
|
list_entry_rcu(list, struct smack_known, list); |
|
|
|
list_for_each_entry_rcu(srp, &skp->smk_rules, list) |
|
smk_rule_show(s, srp, SMK_LONGLABEL); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations load2_seq_ops = { |
|
.start = load2_seq_start, |
|
.next = load2_seq_next, |
|
.show = load2_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_load2 - open() for /smack/load2 |
|
* @inode: inode structure representing file |
|
* @file: "load2" file pointer |
|
* |
|
* For reading, use load2_seq_* seq_file reading operations. |
|
*/ |
|
static int smk_open_load2(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &load2_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_load2 - write() for /smack/load2 |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* |
|
*/ |
|
static ssize_t smk_write_load2(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
/* |
|
* Must have privilege. |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
|
SMK_LONG_FMT); |
|
} |
|
|
|
static const struct file_operations smk_load2_ops = { |
|
.open = smk_open_load2, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_load2, |
|
.release = seq_release, |
|
}; |
|
|
|
/* |
|
* Seq_file read operations for /smack/load-self2 |
|
*/ |
|
|
|
static void *load_self2_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_start(s, pos, &tsp->smk_rules); |
|
} |
|
|
|
static void *load_self2_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_rules); |
|
} |
|
|
|
static int load_self2_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_rule *srp = |
|
list_entry_rcu(list, struct smack_rule, list); |
|
|
|
smk_rule_show(s, srp, SMK_LONGLABEL); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations load_self2_seq_ops = { |
|
.start = load_self2_seq_start, |
|
.next = load_self2_seq_next, |
|
.show = load_self2_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_load_self2 - open() for /smack/load-self2 |
|
* @inode: inode structure representing file |
|
* @file: "load" file pointer |
|
* |
|
* For reading, use load_seq_* seq_file reading operations. |
|
*/ |
|
static int smk_open_load_self2(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &load_self2_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_load_self2 - write() for /smack/load-self2 |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* |
|
*/ |
|
static ssize_t smk_write_load_self2(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_write_rules_list(file, buf, count, ppos, &tsp->smk_rules, |
|
&tsp->smk_rules_lock, SMK_LONG_FMT); |
|
} |
|
|
|
static const struct file_operations smk_load_self2_ops = { |
|
.open = smk_open_load_self2, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_load_self2, |
|
.release = seq_release, |
|
}; |
|
|
|
/** |
|
* smk_write_access2 - handle access check transaction |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
*/ |
|
static ssize_t smk_write_access2(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
return smk_user_access(file, buf, count, ppos, SMK_LONG_FMT); |
|
} |
|
|
|
static const struct file_operations smk_access2_ops = { |
|
.write = smk_write_access2, |
|
.read = simple_transaction_read, |
|
.release = simple_transaction_release, |
|
.llseek = generic_file_llseek, |
|
}; |
|
|
|
/** |
|
* smk_write_revoke_subj - write() for /smack/revoke-subject |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
*/ |
|
static ssize_t smk_write_revoke_subj(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *data; |
|
const char *cp; |
|
struct smack_known *skp; |
|
struct smack_rule *sp; |
|
struct list_head *rule_list; |
|
struct mutex *rule_lock; |
|
int rc = count; |
|
|
|
if (*ppos != 0) |
|
return -EINVAL; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (count == 0 || count > SMK_LONGLABEL) |
|
return -EINVAL; |
|
|
|
data = memdup_user(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
cp = smk_parse_smack(data, count); |
|
if (IS_ERR(cp)) { |
|
rc = PTR_ERR(cp); |
|
goto out_data; |
|
} |
|
|
|
skp = smk_find_entry(cp); |
|
if (skp == NULL) |
|
goto out_cp; |
|
|
|
rule_list = &skp->smk_rules; |
|
rule_lock = &skp->smk_rules_lock; |
|
|
|
mutex_lock(rule_lock); |
|
|
|
list_for_each_entry_rcu(sp, rule_list, list) |
|
sp->smk_access = 0; |
|
|
|
mutex_unlock(rule_lock); |
|
|
|
out_cp: |
|
kfree(cp); |
|
out_data: |
|
kfree(data); |
|
|
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_revoke_subj_ops = { |
|
.write = smk_write_revoke_subj, |
|
.read = simple_transaction_read, |
|
.release = simple_transaction_release, |
|
.llseek = generic_file_llseek, |
|
}; |
|
|
|
/** |
|
* smk_init_sysfs - initialize /sys/fs/smackfs |
|
* |
|
*/ |
|
static int smk_init_sysfs(void) |
|
{ |
|
return sysfs_create_mount_point(fs_kobj, "smackfs"); |
|
} |
|
|
|
/** |
|
* smk_write_change_rule - write() for /smack/change-rule |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
*/ |
|
static ssize_t smk_write_change_rule(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
/* |
|
* Must have privilege. |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
return smk_write_rules_list(file, buf, count, ppos, NULL, NULL, |
|
SMK_CHANGE_FMT); |
|
} |
|
|
|
static const struct file_operations smk_change_rule_ops = { |
|
.write = smk_write_change_rule, |
|
.read = simple_transaction_read, |
|
.release = simple_transaction_release, |
|
.llseek = generic_file_llseek, |
|
}; |
|
|
|
/** |
|
* smk_read_syslog - read() for smackfs/syslog |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @cn: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_syslog(struct file *filp, char __user *buf, |
|
size_t cn, loff_t *ppos) |
|
{ |
|
struct smack_known *skp; |
|
ssize_t rc = -EINVAL; |
|
int asize; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
if (smack_syslog_label == NULL) |
|
skp = &smack_known_star; |
|
else |
|
skp = smack_syslog_label; |
|
|
|
asize = strlen(skp->smk_known) + 1; |
|
|
|
if (cn >= asize) |
|
rc = simple_read_from_buffer(buf, cn, ppos, skp->smk_known, |
|
asize); |
|
|
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_syslog - write() for smackfs/syslog |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes written or error code, as appropriate |
|
*/ |
|
static ssize_t smk_write_syslog(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *data; |
|
struct smack_known *skp; |
|
int rc = count; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
/* Enough data must be present */ |
|
if (count == 0 || count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
skp = smk_import_entry(data, count); |
|
if (IS_ERR(skp)) |
|
rc = PTR_ERR(skp); |
|
else |
|
smack_syslog_label = skp; |
|
|
|
kfree(data); |
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_syslog_ops = { |
|
.read = smk_read_syslog, |
|
.write = smk_write_syslog, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/* |
|
* Seq_file read operations for /smack/relabel-self |
|
*/ |
|
|
|
static void *relabel_self_seq_start(struct seq_file *s, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_start(s, pos, &tsp->smk_relabel); |
|
} |
|
|
|
static void *relabel_self_seq_next(struct seq_file *s, void *v, loff_t *pos) |
|
{ |
|
struct task_smack *tsp = smack_cred(current_cred()); |
|
|
|
return smk_seq_next(s, v, pos, &tsp->smk_relabel); |
|
} |
|
|
|
static int relabel_self_seq_show(struct seq_file *s, void *v) |
|
{ |
|
struct list_head *list = v; |
|
struct smack_known_list_elem *sklep = |
|
list_entry(list, struct smack_known_list_elem, list); |
|
|
|
seq_puts(s, sklep->smk_label->smk_known); |
|
seq_putc(s, ' '); |
|
|
|
return 0; |
|
} |
|
|
|
static const struct seq_operations relabel_self_seq_ops = { |
|
.start = relabel_self_seq_start, |
|
.next = relabel_self_seq_next, |
|
.show = relabel_self_seq_show, |
|
.stop = smk_seq_stop, |
|
}; |
|
|
|
/** |
|
* smk_open_relabel_self - open() for /smack/relabel-self |
|
* @inode: inode structure representing file |
|
* @file: "relabel-self" file pointer |
|
* |
|
* Connect our relabel_self_seq_* operations with /smack/relabel-self |
|
* file_operations |
|
*/ |
|
static int smk_open_relabel_self(struct inode *inode, struct file *file) |
|
{ |
|
return seq_open(file, &relabel_self_seq_ops); |
|
} |
|
|
|
/** |
|
* smk_write_relabel_self - write() for /smack/relabel-self |
|
* @file: file pointer, not actually used |
|
* @buf: where to get the data from |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
* |
|
*/ |
|
static ssize_t smk_write_relabel_self(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char *data; |
|
int rc; |
|
LIST_HEAD(list_tmp); |
|
|
|
/* |
|
* Must have privilege. |
|
*/ |
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
/* |
|
* No partial write. |
|
* Enough data must be present. |
|
*/ |
|
if (*ppos != 0) |
|
return -EINVAL; |
|
if (count == 0 || count > PAGE_SIZE) |
|
return -EINVAL; |
|
|
|
data = memdup_user_nul(buf, count); |
|
if (IS_ERR(data)) |
|
return PTR_ERR(data); |
|
|
|
rc = smk_parse_label_list(data, &list_tmp); |
|
kfree(data); |
|
|
|
if (!rc || (rc == -EINVAL && list_empty(&list_tmp))) { |
|
struct cred *new; |
|
struct task_smack *tsp; |
|
|
|
new = prepare_creds(); |
|
if (!new) { |
|
rc = -ENOMEM; |
|
goto out; |
|
} |
|
tsp = smack_cred(new); |
|
smk_destroy_label_list(&tsp->smk_relabel); |
|
list_splice(&list_tmp, &tsp->smk_relabel); |
|
commit_creds(new); |
|
return count; |
|
} |
|
out: |
|
smk_destroy_label_list(&list_tmp); |
|
return rc; |
|
} |
|
|
|
static const struct file_operations smk_relabel_self_ops = { |
|
.open = smk_open_relabel_self, |
|
.read = seq_read, |
|
.llseek = seq_lseek, |
|
.write = smk_write_relabel_self, |
|
.release = seq_release, |
|
}; |
|
|
|
/** |
|
* smk_read_ptrace - read() for /smack/ptrace |
|
* @filp: file pointer, not actually used |
|
* @buf: where to put the result |
|
* @count: maximum to send along |
|
* @ppos: where to start |
|
* |
|
* Returns number of bytes read or error code, as appropriate |
|
*/ |
|
static ssize_t smk_read_ptrace(struct file *filp, char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[32]; |
|
ssize_t rc; |
|
|
|
if (*ppos != 0) |
|
return 0; |
|
|
|
sprintf(temp, "%d\n", smack_ptrace_rule); |
|
rc = simple_read_from_buffer(buf, count, ppos, temp, strlen(temp)); |
|
return rc; |
|
} |
|
|
|
/** |
|
* smk_write_ptrace - write() for /smack/ptrace |
|
* @file: file pointer |
|
* @buf: data from user space |
|
* @count: bytes sent |
|
* @ppos: where to start - must be 0 |
|
*/ |
|
static ssize_t smk_write_ptrace(struct file *file, const char __user *buf, |
|
size_t count, loff_t *ppos) |
|
{ |
|
char temp[32]; |
|
int i; |
|
|
|
if (!smack_privileged(CAP_MAC_ADMIN)) |
|
return -EPERM; |
|
|
|
if (*ppos != 0 || count >= sizeof(temp) || count == 0) |
|
return -EINVAL; |
|
|
|
if (copy_from_user(temp, buf, count) != 0) |
|
return -EFAULT; |
|
|
|
temp[count] = '\0'; |
|
|
|
if (sscanf(temp, "%d", &i) != 1) |
|
return -EINVAL; |
|
if (i < SMACK_PTRACE_DEFAULT || i > SMACK_PTRACE_MAX) |
|
return -EINVAL; |
|
smack_ptrace_rule = i; |
|
|
|
return count; |
|
} |
|
|
|
static const struct file_operations smk_ptrace_ops = { |
|
.write = smk_write_ptrace, |
|
.read = smk_read_ptrace, |
|
.llseek = default_llseek, |
|
}; |
|
|
|
/** |
|
* smk_fill_super - fill the smackfs superblock |
|
* @sb: the empty superblock |
|
* @fc: unused |
|
* |
|
* Fill in the well known entries for the smack filesystem |
|
* |
|
* Returns 0 on success, an error code on failure |
|
*/ |
|
static int smk_fill_super(struct super_block *sb, struct fs_context *fc) |
|
{ |
|
int rc; |
|
|
|
static const struct tree_descr smack_files[] = { |
|
[SMK_LOAD] = { |
|
"load", &smk_load_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_CIPSO] = { |
|
"cipso", &smk_cipso_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_DOI] = { |
|
"doi", &smk_doi_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_DIRECT] = { |
|
"direct", &smk_direct_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_AMBIENT] = { |
|
"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_NET4ADDR] = { |
|
"netlabel", &smk_net4addr_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_ONLYCAP] = { |
|
"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_LOGGING] = { |
|
"logging", &smk_logging_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_LOAD_SELF] = { |
|
"load-self", &smk_load_self_ops, S_IRUGO|S_IWUGO}, |
|
[SMK_ACCESSES] = { |
|
"access", &smk_access_ops, S_IRUGO|S_IWUGO}, |
|
[SMK_MAPPED] = { |
|
"mapped", &smk_mapped_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_LOAD2] = { |
|
"load2", &smk_load2_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_LOAD_SELF2] = { |
|
"load-self2", &smk_load_self2_ops, S_IRUGO|S_IWUGO}, |
|
[SMK_ACCESS2] = { |
|
"access2", &smk_access2_ops, S_IRUGO|S_IWUGO}, |
|
[SMK_CIPSO2] = { |
|
"cipso2", &smk_cipso2_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_REVOKE_SUBJ] = { |
|
"revoke-subject", &smk_revoke_subj_ops, |
|
S_IRUGO|S_IWUSR}, |
|
[SMK_CHANGE_RULE] = { |
|
"change-rule", &smk_change_rule_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_SYSLOG] = { |
|
"syslog", &smk_syslog_ops, S_IRUGO|S_IWUSR}, |
|
[SMK_PTRACE] = { |
|
"ptrace", &smk_ptrace_ops, S_IRUGO|S_IWUSR}, |
|
#ifdef CONFIG_SECURITY_SMACK_BRINGUP |
|
[SMK_UNCONFINED] = { |
|
"unconfined", &smk_unconfined_ops, S_IRUGO|S_IWUSR}, |
|
#endif |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
[SMK_NET6ADDR] = { |
|
"ipv6host", &smk_net6addr_ops, S_IRUGO|S_IWUSR}, |
|
#endif /* CONFIG_IPV6 */ |
|
[SMK_RELABEL_SELF] = { |
|
"relabel-self", &smk_relabel_self_ops, |
|
S_IRUGO|S_IWUGO}, |
|
/* last one */ |
|
{""} |
|
}; |
|
|
|
rc = simple_fill_super(sb, SMACK_MAGIC, smack_files); |
|
if (rc != 0) { |
|
printk(KERN_ERR "%s failed %d while creating inodes\n", |
|
__func__, rc); |
|
return rc; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* smk_get_tree - get the smackfs superblock |
|
* @fc: The mount context, including any options |
|
* |
|
* Just passes everything along. |
|
* |
|
* Returns what the lower level code does. |
|
*/ |
|
static int smk_get_tree(struct fs_context *fc) |
|
{ |
|
return get_tree_single(fc, smk_fill_super); |
|
} |
|
|
|
static const struct fs_context_operations smk_context_ops = { |
|
.get_tree = smk_get_tree, |
|
}; |
|
|
|
/** |
|
* smk_init_fs_context - Initialise a filesystem context for smackfs |
|
* @fc: The blank mount context |
|
*/ |
|
static int smk_init_fs_context(struct fs_context *fc) |
|
{ |
|
fc->ops = &smk_context_ops; |
|
return 0; |
|
} |
|
|
|
static struct file_system_type smk_fs_type = { |
|
.name = "smackfs", |
|
.init_fs_context = smk_init_fs_context, |
|
.kill_sb = kill_litter_super, |
|
}; |
|
|
|
static struct vfsmount *smackfs_mount; |
|
|
|
/** |
|
* init_smk_fs - get the smackfs superblock |
|
* |
|
* register the smackfs |
|
* |
|
* Do not register smackfs if Smack wasn't enabled |
|
* on boot. We can not put this method normally under the |
|
* smack_init() code path since the security subsystem get |
|
* initialized before the vfs caches. |
|
* |
|
* Returns true if we were not chosen on boot or if |
|
* we were chosen and filesystem registration succeeded. |
|
*/ |
|
static int __init init_smk_fs(void) |
|
{ |
|
int err; |
|
int rc; |
|
|
|
if (smack_enabled == 0) |
|
return 0; |
|
|
|
err = smk_init_sysfs(); |
|
if (err) |
|
printk(KERN_ERR "smackfs: sysfs mountpoint problem.\n"); |
|
|
|
err = register_filesystem(&smk_fs_type); |
|
if (!err) { |
|
smackfs_mount = kern_mount(&smk_fs_type); |
|
if (IS_ERR(smackfs_mount)) { |
|
printk(KERN_ERR "smackfs: could not mount!\n"); |
|
err = PTR_ERR(smackfs_mount); |
|
smackfs_mount = NULL; |
|
} |
|
} |
|
|
|
smk_cipso_doi(); |
|
smk_unlbl_ambient(NULL); |
|
|
|
rc = smack_populate_secattr(&smack_known_floor); |
|
if (err == 0 && rc < 0) |
|
err = rc; |
|
rc = smack_populate_secattr(&smack_known_hat); |
|
if (err == 0 && rc < 0) |
|
err = rc; |
|
rc = smack_populate_secattr(&smack_known_huh); |
|
if (err == 0 && rc < 0) |
|
err = rc; |
|
rc = smack_populate_secattr(&smack_known_star); |
|
if (err == 0 && rc < 0) |
|
err = rc; |
|
rc = smack_populate_secattr(&smack_known_web); |
|
if (err == 0 && rc < 0) |
|
err = rc; |
|
|
|
return err; |
|
} |
|
|
|
__initcall(init_smk_fs);
|
|
|