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918 lines
21 KiB
918 lines
21 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/types.h> |
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#include <linux/sched.h> |
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#include <linux/module.h> |
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#include <linux/sunrpc/types.h> |
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#include <linux/sunrpc/xdr.h> |
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#include <linux/sunrpc/svcsock.h> |
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#include <linux/sunrpc/svcauth.h> |
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#include <linux/sunrpc/gss_api.h> |
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#include <linux/sunrpc/addr.h> |
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#include <linux/err.h> |
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#include <linux/seq_file.h> |
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#include <linux/hash.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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#include <net/sock.h> |
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#include <net/ipv6.h> |
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#include <linux/kernel.h> |
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#include <linux/user_namespace.h> |
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#define RPCDBG_FACILITY RPCDBG_AUTH |
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#include "netns.h" |
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|
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/* |
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* AUTHUNIX and AUTHNULL credentials are both handled here. |
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* AUTHNULL is treated just like AUTHUNIX except that the uid/gid |
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* are always nobody (-2). i.e. we do the same IP address checks for |
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* AUTHNULL as for AUTHUNIX, and that is done here. |
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*/ |
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struct unix_domain { |
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struct auth_domain h; |
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/* other stuff later */ |
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}; |
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|
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extern struct auth_ops svcauth_null; |
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extern struct auth_ops svcauth_unix; |
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|
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static void svcauth_unix_domain_release_rcu(struct rcu_head *head) |
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{ |
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struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head); |
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struct unix_domain *ud = container_of(dom, struct unix_domain, h); |
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|
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kfree(dom->name); |
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kfree(ud); |
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} |
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|
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static void svcauth_unix_domain_release(struct auth_domain *dom) |
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{ |
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call_rcu(&dom->rcu_head, svcauth_unix_domain_release_rcu); |
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} |
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|
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struct auth_domain *unix_domain_find(char *name) |
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{ |
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struct auth_domain *rv; |
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struct unix_domain *new = NULL; |
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|
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rv = auth_domain_find(name); |
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while(1) { |
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if (rv) { |
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if (new && rv != &new->h) |
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svcauth_unix_domain_release(&new->h); |
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|
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if (rv->flavour != &svcauth_unix) { |
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auth_domain_put(rv); |
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return NULL; |
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} |
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return rv; |
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} |
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|
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new = kmalloc(sizeof(*new), GFP_KERNEL); |
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if (new == NULL) |
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return NULL; |
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kref_init(&new->h.ref); |
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new->h.name = kstrdup(name, GFP_KERNEL); |
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if (new->h.name == NULL) { |
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kfree(new); |
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return NULL; |
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} |
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new->h.flavour = &svcauth_unix; |
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rv = auth_domain_lookup(name, &new->h); |
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} |
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} |
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EXPORT_SYMBOL_GPL(unix_domain_find); |
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|
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/************************************************** |
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* cache for IP address to unix_domain |
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* as needed by AUTH_UNIX |
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*/ |
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#define IP_HASHBITS 8 |
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#define IP_HASHMAX (1<<IP_HASHBITS) |
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|
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struct ip_map { |
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struct cache_head h; |
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char m_class[8]; /* e.g. "nfsd" */ |
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struct in6_addr m_addr; |
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struct unix_domain *m_client; |
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struct rcu_head m_rcu; |
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}; |
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|
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static void ip_map_put(struct kref *kref) |
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{ |
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struct cache_head *item = container_of(kref, struct cache_head, ref); |
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struct ip_map *im = container_of(item, struct ip_map,h); |
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|
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if (test_bit(CACHE_VALID, &item->flags) && |
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!test_bit(CACHE_NEGATIVE, &item->flags)) |
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auth_domain_put(&im->m_client->h); |
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kfree_rcu(im, m_rcu); |
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} |
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|
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static inline int hash_ip6(const struct in6_addr *ip) |
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{ |
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return hash_32(ipv6_addr_hash(ip), IP_HASHBITS); |
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} |
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static int ip_map_match(struct cache_head *corig, struct cache_head *cnew) |
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{ |
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struct ip_map *orig = container_of(corig, struct ip_map, h); |
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struct ip_map *new = container_of(cnew, struct ip_map, h); |
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return strcmp(orig->m_class, new->m_class) == 0 && |
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ipv6_addr_equal(&orig->m_addr, &new->m_addr); |
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} |
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static void ip_map_init(struct cache_head *cnew, struct cache_head *citem) |
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{ |
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struct ip_map *new = container_of(cnew, struct ip_map, h); |
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struct ip_map *item = container_of(citem, struct ip_map, h); |
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|
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strcpy(new->m_class, item->m_class); |
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new->m_addr = item->m_addr; |
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} |
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static void update(struct cache_head *cnew, struct cache_head *citem) |
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{ |
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struct ip_map *new = container_of(cnew, struct ip_map, h); |
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struct ip_map *item = container_of(citem, struct ip_map, h); |
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|
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kref_get(&item->m_client->h.ref); |
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new->m_client = item->m_client; |
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} |
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static struct cache_head *ip_map_alloc(void) |
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{ |
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struct ip_map *i = kmalloc(sizeof(*i), GFP_KERNEL); |
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if (i) |
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return &i->h; |
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else |
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return NULL; |
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} |
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|
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static int ip_map_upcall(struct cache_detail *cd, struct cache_head *h) |
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{ |
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return sunrpc_cache_pipe_upcall(cd, h); |
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} |
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|
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static void ip_map_request(struct cache_detail *cd, |
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struct cache_head *h, |
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char **bpp, int *blen) |
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{ |
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char text_addr[40]; |
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struct ip_map *im = container_of(h, struct ip_map, h); |
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|
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if (ipv6_addr_v4mapped(&(im->m_addr))) { |
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snprintf(text_addr, 20, "%pI4", &im->m_addr.s6_addr32[3]); |
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} else { |
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snprintf(text_addr, 40, "%pI6", &im->m_addr); |
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} |
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qword_add(bpp, blen, im->m_class); |
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qword_add(bpp, blen, text_addr); |
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(*bpp)[-1] = '\n'; |
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} |
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|
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static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, struct in6_addr *addr); |
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static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, struct unix_domain *udom, time64_t expiry); |
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|
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static int ip_map_parse(struct cache_detail *cd, |
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char *mesg, int mlen) |
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{ |
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/* class ipaddress [domainname] */ |
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/* should be safe just to use the start of the input buffer |
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* for scratch: */ |
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char *buf = mesg; |
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int len; |
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char class[8]; |
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union { |
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struct sockaddr sa; |
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struct sockaddr_in s4; |
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struct sockaddr_in6 s6; |
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} address; |
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struct sockaddr_in6 sin6; |
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int err; |
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|
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struct ip_map *ipmp; |
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struct auth_domain *dom; |
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time64_t expiry; |
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|
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if (mesg[mlen-1] != '\n') |
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return -EINVAL; |
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mesg[mlen-1] = 0; |
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|
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/* class */ |
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len = qword_get(&mesg, class, sizeof(class)); |
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if (len <= 0) return -EINVAL; |
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|
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/* ip address */ |
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len = qword_get(&mesg, buf, mlen); |
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if (len <= 0) return -EINVAL; |
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|
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if (rpc_pton(cd->net, buf, len, &address.sa, sizeof(address)) == 0) |
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return -EINVAL; |
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switch (address.sa.sa_family) { |
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case AF_INET: |
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/* Form a mapped IPv4 address in sin6 */ |
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sin6.sin6_family = AF_INET6; |
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ipv6_addr_set_v4mapped(address.s4.sin_addr.s_addr, |
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&sin6.sin6_addr); |
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break; |
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#if IS_ENABLED(CONFIG_IPV6) |
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case AF_INET6: |
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memcpy(&sin6, &address.s6, sizeof(sin6)); |
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break; |
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#endif |
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default: |
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return -EINVAL; |
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} |
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|
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expiry = get_expiry(&mesg); |
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if (expiry ==0) |
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return -EINVAL; |
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|
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/* domainname, or empty for NEGATIVE */ |
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len = qword_get(&mesg, buf, mlen); |
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if (len < 0) return -EINVAL; |
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|
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if (len) { |
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dom = unix_domain_find(buf); |
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if (dom == NULL) |
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return -ENOENT; |
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} else |
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dom = NULL; |
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|
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/* IPv6 scope IDs are ignored for now */ |
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ipmp = __ip_map_lookup(cd, class, &sin6.sin6_addr); |
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if (ipmp) { |
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err = __ip_map_update(cd, ipmp, |
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container_of(dom, struct unix_domain, h), |
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expiry); |
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} else |
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err = -ENOMEM; |
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|
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if (dom) |
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auth_domain_put(dom); |
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|
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cache_flush(); |
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return err; |
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} |
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|
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static int ip_map_show(struct seq_file *m, |
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struct cache_detail *cd, |
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struct cache_head *h) |
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{ |
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struct ip_map *im; |
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struct in6_addr addr; |
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char *dom = "-no-domain-"; |
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|
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if (h == NULL) { |
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seq_puts(m, "#class IP domain\n"); |
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return 0; |
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} |
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im = container_of(h, struct ip_map, h); |
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/* class addr domain */ |
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addr = im->m_addr; |
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|
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if (test_bit(CACHE_VALID, &h->flags) && |
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!test_bit(CACHE_NEGATIVE, &h->flags)) |
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dom = im->m_client->h.name; |
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|
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if (ipv6_addr_v4mapped(&addr)) { |
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seq_printf(m, "%s %pI4 %s\n", |
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im->m_class, &addr.s6_addr32[3], dom); |
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} else { |
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seq_printf(m, "%s %pI6 %s\n", im->m_class, &addr, dom); |
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} |
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return 0; |
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} |
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|
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static struct ip_map *__ip_map_lookup(struct cache_detail *cd, char *class, |
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struct in6_addr *addr) |
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{ |
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struct ip_map ip; |
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struct cache_head *ch; |
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|
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strcpy(ip.m_class, class); |
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ip.m_addr = *addr; |
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ch = sunrpc_cache_lookup_rcu(cd, &ip.h, |
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hash_str(class, IP_HASHBITS) ^ |
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hash_ip6(addr)); |
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|
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if (ch) |
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return container_of(ch, struct ip_map, h); |
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else |
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return NULL; |
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} |
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|
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static int __ip_map_update(struct cache_detail *cd, struct ip_map *ipm, |
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struct unix_domain *udom, time64_t expiry) |
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{ |
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struct ip_map ip; |
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struct cache_head *ch; |
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|
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ip.m_client = udom; |
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ip.h.flags = 0; |
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if (!udom) |
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set_bit(CACHE_NEGATIVE, &ip.h.flags); |
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ip.h.expiry_time = expiry; |
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ch = sunrpc_cache_update(cd, &ip.h, &ipm->h, |
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hash_str(ipm->m_class, IP_HASHBITS) ^ |
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hash_ip6(&ipm->m_addr)); |
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if (!ch) |
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return -ENOMEM; |
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cache_put(ch, cd); |
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return 0; |
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} |
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|
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void svcauth_unix_purge(struct net *net) |
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{ |
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struct sunrpc_net *sn; |
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|
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sn = net_generic(net, sunrpc_net_id); |
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cache_purge(sn->ip_map_cache); |
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} |
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EXPORT_SYMBOL_GPL(svcauth_unix_purge); |
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|
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static inline struct ip_map * |
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ip_map_cached_get(struct svc_xprt *xprt) |
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{ |
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struct ip_map *ipm = NULL; |
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struct sunrpc_net *sn; |
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|
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if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { |
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spin_lock(&xprt->xpt_lock); |
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ipm = xprt->xpt_auth_cache; |
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if (ipm != NULL) { |
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sn = net_generic(xprt->xpt_net, sunrpc_net_id); |
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if (cache_is_expired(sn->ip_map_cache, &ipm->h)) { |
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/* |
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* The entry has been invalidated since it was |
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* remembered, e.g. by a second mount from the |
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* same IP address. |
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*/ |
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xprt->xpt_auth_cache = NULL; |
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spin_unlock(&xprt->xpt_lock); |
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cache_put(&ipm->h, sn->ip_map_cache); |
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return NULL; |
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} |
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cache_get(&ipm->h); |
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} |
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spin_unlock(&xprt->xpt_lock); |
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} |
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return ipm; |
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} |
|
|
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static inline void |
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ip_map_cached_put(struct svc_xprt *xprt, struct ip_map *ipm) |
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{ |
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if (test_bit(XPT_CACHE_AUTH, &xprt->xpt_flags)) { |
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spin_lock(&xprt->xpt_lock); |
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if (xprt->xpt_auth_cache == NULL) { |
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/* newly cached, keep the reference */ |
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xprt->xpt_auth_cache = ipm; |
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ipm = NULL; |
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} |
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spin_unlock(&xprt->xpt_lock); |
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} |
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if (ipm) { |
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struct sunrpc_net *sn; |
|
|
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sn = net_generic(xprt->xpt_net, sunrpc_net_id); |
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cache_put(&ipm->h, sn->ip_map_cache); |
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} |
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} |
|
|
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void |
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svcauth_unix_info_release(struct svc_xprt *xpt) |
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{ |
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struct ip_map *ipm; |
|
|
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ipm = xpt->xpt_auth_cache; |
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if (ipm != NULL) { |
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struct sunrpc_net *sn; |
|
|
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sn = net_generic(xpt->xpt_net, sunrpc_net_id); |
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cache_put(&ipm->h, sn->ip_map_cache); |
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} |
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} |
|
|
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/**************************************************************************** |
|
* auth.unix.gid cache |
|
* simple cache to map a UID to a list of GIDs |
|
* because AUTH_UNIX aka AUTH_SYS has a max of UNX_NGROUPS |
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*/ |
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#define GID_HASHBITS 8 |
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#define GID_HASHMAX (1<<GID_HASHBITS) |
|
|
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struct unix_gid { |
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struct cache_head h; |
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kuid_t uid; |
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struct group_info *gi; |
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struct rcu_head rcu; |
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}; |
|
|
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static int unix_gid_hash(kuid_t uid) |
|
{ |
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return hash_long(from_kuid(&init_user_ns, uid), GID_HASHBITS); |
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} |
|
|
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static void unix_gid_put(struct kref *kref) |
|
{ |
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struct cache_head *item = container_of(kref, struct cache_head, ref); |
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struct unix_gid *ug = container_of(item, struct unix_gid, h); |
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if (test_bit(CACHE_VALID, &item->flags) && |
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!test_bit(CACHE_NEGATIVE, &item->flags)) |
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put_group_info(ug->gi); |
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kfree_rcu(ug, rcu); |
|
} |
|
|
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static int unix_gid_match(struct cache_head *corig, struct cache_head *cnew) |
|
{ |
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struct unix_gid *orig = container_of(corig, struct unix_gid, h); |
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struct unix_gid *new = container_of(cnew, struct unix_gid, h); |
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return uid_eq(orig->uid, new->uid); |
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} |
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static void unix_gid_init(struct cache_head *cnew, struct cache_head *citem) |
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{ |
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struct unix_gid *new = container_of(cnew, struct unix_gid, h); |
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struct unix_gid *item = container_of(citem, struct unix_gid, h); |
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new->uid = item->uid; |
|
} |
|
static void unix_gid_update(struct cache_head *cnew, struct cache_head *citem) |
|
{ |
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struct unix_gid *new = container_of(cnew, struct unix_gid, h); |
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struct unix_gid *item = container_of(citem, struct unix_gid, h); |
|
|
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get_group_info(item->gi); |
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new->gi = item->gi; |
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} |
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static struct cache_head *unix_gid_alloc(void) |
|
{ |
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struct unix_gid *g = kmalloc(sizeof(*g), GFP_KERNEL); |
|
if (g) |
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return &g->h; |
|
else |
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return NULL; |
|
} |
|
|
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static int unix_gid_upcall(struct cache_detail *cd, struct cache_head *h) |
|
{ |
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return sunrpc_cache_pipe_upcall_timeout(cd, h); |
|
} |
|
|
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static void unix_gid_request(struct cache_detail *cd, |
|
struct cache_head *h, |
|
char **bpp, int *blen) |
|
{ |
|
char tuid[20]; |
|
struct unix_gid *ug = container_of(h, struct unix_gid, h); |
|
|
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snprintf(tuid, 20, "%u", from_kuid(&init_user_ns, ug->uid)); |
|
qword_add(bpp, blen, tuid); |
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(*bpp)[-1] = '\n'; |
|
} |
|
|
|
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid); |
|
|
|
static int unix_gid_parse(struct cache_detail *cd, |
|
char *mesg, int mlen) |
|
{ |
|
/* uid expiry Ngid gid0 gid1 ... gidN-1 */ |
|
int id; |
|
kuid_t uid; |
|
int gids; |
|
int rv; |
|
int i; |
|
int err; |
|
time64_t expiry; |
|
struct unix_gid ug, *ugp; |
|
|
|
if (mesg[mlen - 1] != '\n') |
|
return -EINVAL; |
|
mesg[mlen-1] = 0; |
|
|
|
rv = get_int(&mesg, &id); |
|
if (rv) |
|
return -EINVAL; |
|
uid = make_kuid(current_user_ns(), id); |
|
ug.uid = uid; |
|
|
|
expiry = get_expiry(&mesg); |
|
if (expiry == 0) |
|
return -EINVAL; |
|
|
|
rv = get_int(&mesg, &gids); |
|
if (rv || gids < 0 || gids > 8192) |
|
return -EINVAL; |
|
|
|
ug.gi = groups_alloc(gids); |
|
if (!ug.gi) |
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return -ENOMEM; |
|
|
|
for (i = 0 ; i < gids ; i++) { |
|
int gid; |
|
kgid_t kgid; |
|
rv = get_int(&mesg, &gid); |
|
err = -EINVAL; |
|
if (rv) |
|
goto out; |
|
kgid = make_kgid(current_user_ns(), gid); |
|
if (!gid_valid(kgid)) |
|
goto out; |
|
ug.gi->gid[i] = kgid; |
|
} |
|
|
|
groups_sort(ug.gi); |
|
ugp = unix_gid_lookup(cd, uid); |
|
if (ugp) { |
|
struct cache_head *ch; |
|
ug.h.flags = 0; |
|
ug.h.expiry_time = expiry; |
|
ch = sunrpc_cache_update(cd, |
|
&ug.h, &ugp->h, |
|
unix_gid_hash(uid)); |
|
if (!ch) |
|
err = -ENOMEM; |
|
else { |
|
err = 0; |
|
cache_put(ch, cd); |
|
} |
|
} else |
|
err = -ENOMEM; |
|
out: |
|
if (ug.gi) |
|
put_group_info(ug.gi); |
|
return err; |
|
} |
|
|
|
static int unix_gid_show(struct seq_file *m, |
|
struct cache_detail *cd, |
|
struct cache_head *h) |
|
{ |
|
struct user_namespace *user_ns = m->file->f_cred->user_ns; |
|
struct unix_gid *ug; |
|
int i; |
|
int glen; |
|
|
|
if (h == NULL) { |
|
seq_puts(m, "#uid cnt: gids...\n"); |
|
return 0; |
|
} |
|
ug = container_of(h, struct unix_gid, h); |
|
if (test_bit(CACHE_VALID, &h->flags) && |
|
!test_bit(CACHE_NEGATIVE, &h->flags)) |
|
glen = ug->gi->ngroups; |
|
else |
|
glen = 0; |
|
|
|
seq_printf(m, "%u %d:", from_kuid_munged(user_ns, ug->uid), glen); |
|
for (i = 0; i < glen; i++) |
|
seq_printf(m, " %d", from_kgid_munged(user_ns, ug->gi->gid[i])); |
|
seq_printf(m, "\n"); |
|
return 0; |
|
} |
|
|
|
static const struct cache_detail unix_gid_cache_template = { |
|
.owner = THIS_MODULE, |
|
.hash_size = GID_HASHMAX, |
|
.name = "auth.unix.gid", |
|
.cache_put = unix_gid_put, |
|
.cache_upcall = unix_gid_upcall, |
|
.cache_request = unix_gid_request, |
|
.cache_parse = unix_gid_parse, |
|
.cache_show = unix_gid_show, |
|
.match = unix_gid_match, |
|
.init = unix_gid_init, |
|
.update = unix_gid_update, |
|
.alloc = unix_gid_alloc, |
|
}; |
|
|
|
int unix_gid_cache_create(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct cache_detail *cd; |
|
int err; |
|
|
|
cd = cache_create_net(&unix_gid_cache_template, net); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
err = cache_register_net(cd, net); |
|
if (err) { |
|
cache_destroy_net(cd, net); |
|
return err; |
|
} |
|
sn->unix_gid_cache = cd; |
|
return 0; |
|
} |
|
|
|
void unix_gid_cache_destroy(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct cache_detail *cd = sn->unix_gid_cache; |
|
|
|
sn->unix_gid_cache = NULL; |
|
cache_purge(cd); |
|
cache_unregister_net(cd, net); |
|
cache_destroy_net(cd, net); |
|
} |
|
|
|
static struct unix_gid *unix_gid_lookup(struct cache_detail *cd, kuid_t uid) |
|
{ |
|
struct unix_gid ug; |
|
struct cache_head *ch; |
|
|
|
ug.uid = uid; |
|
ch = sunrpc_cache_lookup_rcu(cd, &ug.h, unix_gid_hash(uid)); |
|
if (ch) |
|
return container_of(ch, struct unix_gid, h); |
|
else |
|
return NULL; |
|
} |
|
|
|
static struct group_info *unix_gid_find(kuid_t uid, struct svc_rqst *rqstp) |
|
{ |
|
struct unix_gid *ug; |
|
struct group_info *gi; |
|
int ret; |
|
struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, |
|
sunrpc_net_id); |
|
|
|
ug = unix_gid_lookup(sn->unix_gid_cache, uid); |
|
if (!ug) |
|
return ERR_PTR(-EAGAIN); |
|
ret = cache_check(sn->unix_gid_cache, &ug->h, &rqstp->rq_chandle); |
|
switch (ret) { |
|
case -ENOENT: |
|
return ERR_PTR(-ENOENT); |
|
case -ETIMEDOUT: |
|
return ERR_PTR(-ESHUTDOWN); |
|
case 0: |
|
gi = get_group_info(ug->gi); |
|
cache_put(&ug->h, sn->unix_gid_cache); |
|
return gi; |
|
default: |
|
return ERR_PTR(-EAGAIN); |
|
} |
|
} |
|
|
|
int |
|
svcauth_unix_set_client(struct svc_rqst *rqstp) |
|
{ |
|
struct sockaddr_in *sin; |
|
struct sockaddr_in6 *sin6, sin6_storage; |
|
struct ip_map *ipm; |
|
struct group_info *gi; |
|
struct svc_cred *cred = &rqstp->rq_cred; |
|
struct svc_xprt *xprt = rqstp->rq_xprt; |
|
struct net *net = xprt->xpt_net; |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
|
|
switch (rqstp->rq_addr.ss_family) { |
|
case AF_INET: |
|
sin = svc_addr_in(rqstp); |
|
sin6 = &sin6_storage; |
|
ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &sin6->sin6_addr); |
|
break; |
|
case AF_INET6: |
|
sin6 = svc_addr_in6(rqstp); |
|
break; |
|
default: |
|
BUG(); |
|
} |
|
|
|
rqstp->rq_client = NULL; |
|
if (rqstp->rq_proc == 0) |
|
goto out; |
|
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred; |
|
ipm = ip_map_cached_get(xprt); |
|
if (ipm == NULL) |
|
ipm = __ip_map_lookup(sn->ip_map_cache, rqstp->rq_server->sv_program->pg_class, |
|
&sin6->sin6_addr); |
|
|
|
if (ipm == NULL) |
|
return SVC_DENIED; |
|
|
|
switch (cache_check(sn->ip_map_cache, &ipm->h, &rqstp->rq_chandle)) { |
|
default: |
|
BUG(); |
|
case -ETIMEDOUT: |
|
return SVC_CLOSE; |
|
case -EAGAIN: |
|
return SVC_DROP; |
|
case -ENOENT: |
|
return SVC_DENIED; |
|
case 0: |
|
rqstp->rq_client = &ipm->m_client->h; |
|
kref_get(&rqstp->rq_client->ref); |
|
ip_map_cached_put(xprt, ipm); |
|
break; |
|
} |
|
|
|
gi = unix_gid_find(cred->cr_uid, rqstp); |
|
switch (PTR_ERR(gi)) { |
|
case -EAGAIN: |
|
return SVC_DROP; |
|
case -ESHUTDOWN: |
|
return SVC_CLOSE; |
|
case -ENOENT: |
|
break; |
|
default: |
|
put_group_info(cred->cr_group_info); |
|
cred->cr_group_info = gi; |
|
} |
|
|
|
out: |
|
rqstp->rq_auth_stat = rpc_auth_ok; |
|
return SVC_OK; |
|
} |
|
|
|
EXPORT_SYMBOL_GPL(svcauth_unix_set_client); |
|
|
|
static int |
|
svcauth_null_accept(struct svc_rqst *rqstp) |
|
{ |
|
struct kvec *argv = &rqstp->rq_arg.head[0]; |
|
struct kvec *resv = &rqstp->rq_res.head[0]; |
|
struct svc_cred *cred = &rqstp->rq_cred; |
|
|
|
if (argv->iov_len < 3*4) |
|
return SVC_GARBAGE; |
|
|
|
if (svc_getu32(argv) != 0) { |
|
dprintk("svc: bad null cred\n"); |
|
rqstp->rq_auth_stat = rpc_autherr_badcred; |
|
return SVC_DENIED; |
|
} |
|
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) { |
|
dprintk("svc: bad null verf\n"); |
|
rqstp->rq_auth_stat = rpc_autherr_badverf; |
|
return SVC_DENIED; |
|
} |
|
|
|
/* Signal that mapping to nobody uid/gid is required */ |
|
cred->cr_uid = INVALID_UID; |
|
cred->cr_gid = INVALID_GID; |
|
cred->cr_group_info = groups_alloc(0); |
|
if (cred->cr_group_info == NULL) |
|
return SVC_CLOSE; /* kmalloc failure - client must retry */ |
|
|
|
/* Put NULL verifier */ |
|
svc_putnl(resv, RPC_AUTH_NULL); |
|
svc_putnl(resv, 0); |
|
|
|
rqstp->rq_cred.cr_flavor = RPC_AUTH_NULL; |
|
return SVC_OK; |
|
} |
|
|
|
static int |
|
svcauth_null_release(struct svc_rqst *rqstp) |
|
{ |
|
if (rqstp->rq_client) |
|
auth_domain_put(rqstp->rq_client); |
|
rqstp->rq_client = NULL; |
|
if (rqstp->rq_cred.cr_group_info) |
|
put_group_info(rqstp->rq_cred.cr_group_info); |
|
rqstp->rq_cred.cr_group_info = NULL; |
|
|
|
return 0; /* don't drop */ |
|
} |
|
|
|
|
|
struct auth_ops svcauth_null = { |
|
.name = "null", |
|
.owner = THIS_MODULE, |
|
.flavour = RPC_AUTH_NULL, |
|
.accept = svcauth_null_accept, |
|
.release = svcauth_null_release, |
|
.set_client = svcauth_unix_set_client, |
|
}; |
|
|
|
|
|
static int |
|
svcauth_unix_accept(struct svc_rqst *rqstp) |
|
{ |
|
struct kvec *argv = &rqstp->rq_arg.head[0]; |
|
struct kvec *resv = &rqstp->rq_res.head[0]; |
|
struct svc_cred *cred = &rqstp->rq_cred; |
|
struct user_namespace *userns; |
|
u32 slen, i; |
|
int len = argv->iov_len; |
|
|
|
if ((len -= 3*4) < 0) |
|
return SVC_GARBAGE; |
|
|
|
svc_getu32(argv); /* length */ |
|
svc_getu32(argv); /* time stamp */ |
|
slen = XDR_QUADLEN(svc_getnl(argv)); /* machname length */ |
|
if (slen > 64 || (len -= (slen + 3)*4) < 0) |
|
goto badcred; |
|
argv->iov_base = (void*)((__be32*)argv->iov_base + slen); /* skip machname */ |
|
argv->iov_len -= slen*4; |
|
/* |
|
* Note: we skip uid_valid()/gid_valid() checks here for |
|
* backwards compatibility with clients that use -1 id's. |
|
* Instead, -1 uid or gid is later mapped to the |
|
* (export-specific) anonymous id by nfsd_setuser. |
|
* Supplementary gid's will be left alone. |
|
*/ |
|
userns = (rqstp->rq_xprt && rqstp->rq_xprt->xpt_cred) ? |
|
rqstp->rq_xprt->xpt_cred->user_ns : &init_user_ns; |
|
cred->cr_uid = make_kuid(userns, svc_getnl(argv)); /* uid */ |
|
cred->cr_gid = make_kgid(userns, svc_getnl(argv)); /* gid */ |
|
slen = svc_getnl(argv); /* gids length */ |
|
if (slen > UNX_NGROUPS || (len -= (slen + 2)*4) < 0) |
|
goto badcred; |
|
cred->cr_group_info = groups_alloc(slen); |
|
if (cred->cr_group_info == NULL) |
|
return SVC_CLOSE; |
|
for (i = 0; i < slen; i++) { |
|
kgid_t kgid = make_kgid(userns, svc_getnl(argv)); |
|
cred->cr_group_info->gid[i] = kgid; |
|
} |
|
groups_sort(cred->cr_group_info); |
|
if (svc_getu32(argv) != htonl(RPC_AUTH_NULL) || svc_getu32(argv) != 0) { |
|
rqstp->rq_auth_stat = rpc_autherr_badverf; |
|
return SVC_DENIED; |
|
} |
|
|
|
/* Put NULL verifier */ |
|
svc_putnl(resv, RPC_AUTH_NULL); |
|
svc_putnl(resv, 0); |
|
|
|
rqstp->rq_cred.cr_flavor = RPC_AUTH_UNIX; |
|
return SVC_OK; |
|
|
|
badcred: |
|
rqstp->rq_auth_stat = rpc_autherr_badcred; |
|
return SVC_DENIED; |
|
} |
|
|
|
static int |
|
svcauth_unix_release(struct svc_rqst *rqstp) |
|
{ |
|
/* Verifier (such as it is) is already in place. |
|
*/ |
|
if (rqstp->rq_client) |
|
auth_domain_put(rqstp->rq_client); |
|
rqstp->rq_client = NULL; |
|
if (rqstp->rq_cred.cr_group_info) |
|
put_group_info(rqstp->rq_cred.cr_group_info); |
|
rqstp->rq_cred.cr_group_info = NULL; |
|
|
|
return 0; |
|
} |
|
|
|
|
|
struct auth_ops svcauth_unix = { |
|
.name = "unix", |
|
.owner = THIS_MODULE, |
|
.flavour = RPC_AUTH_UNIX, |
|
.accept = svcauth_unix_accept, |
|
.release = svcauth_unix_release, |
|
.domain_release = svcauth_unix_domain_release, |
|
.set_client = svcauth_unix_set_client, |
|
}; |
|
|
|
static const struct cache_detail ip_map_cache_template = { |
|
.owner = THIS_MODULE, |
|
.hash_size = IP_HASHMAX, |
|
.name = "auth.unix.ip", |
|
.cache_put = ip_map_put, |
|
.cache_upcall = ip_map_upcall, |
|
.cache_request = ip_map_request, |
|
.cache_parse = ip_map_parse, |
|
.cache_show = ip_map_show, |
|
.match = ip_map_match, |
|
.init = ip_map_init, |
|
.update = update, |
|
.alloc = ip_map_alloc, |
|
}; |
|
|
|
int ip_map_cache_create(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct cache_detail *cd; |
|
int err; |
|
|
|
cd = cache_create_net(&ip_map_cache_template, net); |
|
if (IS_ERR(cd)) |
|
return PTR_ERR(cd); |
|
err = cache_register_net(cd, net); |
|
if (err) { |
|
cache_destroy_net(cd, net); |
|
return err; |
|
} |
|
sn->ip_map_cache = cd; |
|
return 0; |
|
} |
|
|
|
void ip_map_cache_destroy(struct net *net) |
|
{ |
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id); |
|
struct cache_detail *cd = sn->ip_map_cache; |
|
|
|
sn->ip_map_cache = NULL; |
|
cache_purge(cd); |
|
cache_unregister_net(cd, net); |
|
cache_destroy_net(cd, net); |
|
}
|
|
|