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479 lines
12 KiB
479 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* security/tomoyo/audit.c |
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* |
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* Copyright (C) 2005-2011 NTT DATA CORPORATION |
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*/ |
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|
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#include "common.h" |
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#include <linux/slab.h> |
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|
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/** |
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* tomoyo_print_bprm - Print "struct linux_binprm" for auditing. |
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* |
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* @bprm: Pointer to "struct linux_binprm". |
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* @dump: Pointer to "struct tomoyo_page_dump". |
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* |
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* Returns the contents of @bprm on success, NULL otherwise. |
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* |
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* This function uses kzalloc(), so caller must kfree() if this function |
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* didn't return NULL. |
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*/ |
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static char *tomoyo_print_bprm(struct linux_binprm *bprm, |
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struct tomoyo_page_dump *dump) |
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{ |
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static const int tomoyo_buffer_len = 4096 * 2; |
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char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS); |
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char *cp; |
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char *last_start; |
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int len; |
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unsigned long pos = bprm->p; |
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int offset = pos % PAGE_SIZE; |
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int argv_count = bprm->argc; |
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int envp_count = bprm->envc; |
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bool truncated = false; |
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if (!buffer) |
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return NULL; |
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len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ "); |
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cp = buffer + len; |
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if (!argv_count) { |
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memmove(cp, "} envp[]={ ", 11); |
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cp += 11; |
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} |
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last_start = cp; |
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while (argv_count || envp_count) { |
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if (!tomoyo_dump_page(bprm, pos, dump)) |
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goto out; |
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pos += PAGE_SIZE - offset; |
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/* Read. */ |
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while (offset < PAGE_SIZE) { |
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const char *kaddr = dump->data; |
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const unsigned char c = kaddr[offset++]; |
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if (cp == last_start) |
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*cp++ = '"'; |
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if (cp >= buffer + tomoyo_buffer_len - 32) { |
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/* Reserve some room for "..." string. */ |
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truncated = true; |
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} else if (c == '\\') { |
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*cp++ = '\\'; |
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*cp++ = '\\'; |
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} else if (c > ' ' && c < 127) { |
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*cp++ = c; |
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} else if (!c) { |
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*cp++ = '"'; |
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*cp++ = ' '; |
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last_start = cp; |
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} else { |
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*cp++ = '\\'; |
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*cp++ = (c >> 6) + '0'; |
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*cp++ = ((c >> 3) & 7) + '0'; |
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*cp++ = (c & 7) + '0'; |
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} |
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if (c) |
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continue; |
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if (argv_count) { |
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if (--argv_count == 0) { |
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if (truncated) { |
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cp = last_start; |
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memmove(cp, "... ", 4); |
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cp += 4; |
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} |
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memmove(cp, "} envp[]={ ", 11); |
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cp += 11; |
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last_start = cp; |
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truncated = false; |
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} |
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} else if (envp_count) { |
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if (--envp_count == 0) { |
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if (truncated) { |
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cp = last_start; |
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memmove(cp, "... ", 4); |
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cp += 4; |
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} |
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} |
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} |
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if (!argv_count && !envp_count) |
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break; |
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} |
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offset = 0; |
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} |
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*cp++ = '}'; |
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*cp = '\0'; |
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return buffer; |
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out: |
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snprintf(buffer, tomoyo_buffer_len - 1, |
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"argv[]={ ... } envp[]= { ... }"); |
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return buffer; |
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} |
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/** |
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* tomoyo_filetype - Get string representation of file type. |
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* |
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* @mode: Mode value for stat(). |
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* |
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* Returns file type string. |
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*/ |
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static inline const char *tomoyo_filetype(const umode_t mode) |
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{ |
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switch (mode & S_IFMT) { |
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case S_IFREG: |
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case 0: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE]; |
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case S_IFDIR: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY]; |
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case S_IFLNK: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK]; |
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case S_IFIFO: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO]; |
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case S_IFSOCK: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET]; |
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case S_IFBLK: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV]; |
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case S_IFCHR: |
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return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV]; |
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} |
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return "unknown"; /* This should not happen. */ |
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} |
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/** |
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* tomoyo_print_header - Get header line of audit log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* |
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* Returns string representation. |
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* |
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* This function uses kmalloc(), so caller must kfree() if this function |
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* didn't return NULL. |
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*/ |
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static char *tomoyo_print_header(struct tomoyo_request_info *r) |
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{ |
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struct tomoyo_time stamp; |
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const pid_t gpid = task_pid_nr(current); |
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struct tomoyo_obj_info *obj = r->obj; |
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static const int tomoyo_buffer_len = 4096; |
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char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS); |
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int pos; |
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u8 i; |
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if (!buffer) |
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return NULL; |
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tomoyo_convert_time(ktime_get_real_seconds(), &stamp); |
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pos = snprintf(buffer, tomoyo_buffer_len - 1, |
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"#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s granted=%s (global-pid=%u) task={ pid=%u ppid=%u uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u fsuid=%u fsgid=%u }", |
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stamp.year, stamp.month, stamp.day, stamp.hour, |
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stamp.min, stamp.sec, r->profile, tomoyo_mode[r->mode], |
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str_yes_no(r->granted), gpid, tomoyo_sys_getpid(), |
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tomoyo_sys_getppid(), |
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from_kuid(&init_user_ns, current_uid()), |
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from_kgid(&init_user_ns, current_gid()), |
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from_kuid(&init_user_ns, current_euid()), |
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from_kgid(&init_user_ns, current_egid()), |
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from_kuid(&init_user_ns, current_suid()), |
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from_kgid(&init_user_ns, current_sgid()), |
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from_kuid(&init_user_ns, current_fsuid()), |
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from_kgid(&init_user_ns, current_fsgid())); |
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if (!obj) |
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goto no_obj_info; |
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if (!obj->validate_done) { |
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tomoyo_get_attributes(obj); |
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obj->validate_done = true; |
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} |
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for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) { |
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struct tomoyo_mini_stat *stat; |
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unsigned int dev; |
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umode_t mode; |
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if (!obj->stat_valid[i]) |
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continue; |
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stat = &obj->stat[i]; |
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dev = stat->dev; |
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mode = stat->mode; |
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if (i & 1) { |
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pos += snprintf(buffer + pos, |
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tomoyo_buffer_len - 1 - pos, |
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" path%u.parent={ uid=%u gid=%u ino=%lu perm=0%o }", |
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(i >> 1) + 1, |
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from_kuid(&init_user_ns, stat->uid), |
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from_kgid(&init_user_ns, stat->gid), |
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(unsigned long)stat->ino, |
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stat->mode & S_IALLUGO); |
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continue; |
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} |
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pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos, |
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" path%u={ uid=%u gid=%u ino=%lu major=%u minor=%u perm=0%o type=%s", |
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(i >> 1) + 1, |
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from_kuid(&init_user_ns, stat->uid), |
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from_kgid(&init_user_ns, stat->gid), |
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(unsigned long)stat->ino, |
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MAJOR(dev), MINOR(dev), |
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mode & S_IALLUGO, tomoyo_filetype(mode)); |
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if (S_ISCHR(mode) || S_ISBLK(mode)) { |
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dev = stat->rdev; |
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pos += snprintf(buffer + pos, |
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tomoyo_buffer_len - 1 - pos, |
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" dev_major=%u dev_minor=%u", |
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MAJOR(dev), MINOR(dev)); |
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} |
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pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos, |
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" }"); |
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} |
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no_obj_info: |
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if (pos < tomoyo_buffer_len - 1) |
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return buffer; |
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kfree(buffer); |
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return NULL; |
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} |
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/** |
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* tomoyo_init_log - Allocate buffer for audit logs. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @len: Buffer size needed for @fmt and @args. |
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* @fmt: The printf()'s format string. |
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* @args: va_list structure for @fmt. |
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* |
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* Returns pointer to allocated memory. |
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* |
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* This function uses kzalloc(), so caller must kfree() if this function |
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* didn't return NULL. |
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*/ |
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char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt, |
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va_list args) |
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{ |
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char *buf = NULL; |
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char *bprm_info = NULL; |
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const char *header = NULL; |
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char *realpath = NULL; |
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const char *symlink = NULL; |
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int pos; |
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const char *domainname = r->domain->domainname->name; |
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header = tomoyo_print_header(r); |
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if (!header) |
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return NULL; |
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/* +10 is for '\n' etc. and '\0'. */ |
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len += strlen(domainname) + strlen(header) + 10; |
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if (r->ee) { |
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struct file *file = r->ee->bprm->file; |
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realpath = tomoyo_realpath_from_path(&file->f_path); |
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bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump); |
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if (!realpath || !bprm_info) |
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goto out; |
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/* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */ |
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len += strlen(realpath) + 80 + strlen(bprm_info); |
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} else if (r->obj && r->obj->symlink_target) { |
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symlink = r->obj->symlink_target->name; |
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/* +18 is for " symlink.target=\"%s\"" */ |
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len += 18 + strlen(symlink); |
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} |
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len = tomoyo_round2(len); |
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buf = kzalloc(len, GFP_NOFS); |
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if (!buf) |
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goto out; |
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len--; |
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pos = snprintf(buf, len, "%s", header); |
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if (realpath) { |
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struct linux_binprm *bprm = r->ee->bprm; |
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pos += snprintf(buf + pos, len - pos, |
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" exec={ realpath=\"%s\" argc=%d envc=%d %s }", |
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realpath, bprm->argc, bprm->envc, bprm_info); |
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} else if (symlink) |
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pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"", |
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symlink); |
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pos += snprintf(buf + pos, len - pos, "\n%s\n", domainname); |
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vsnprintf(buf + pos, len - pos, fmt, args); |
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out: |
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kfree(realpath); |
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kfree(bprm_info); |
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kfree(header); |
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return buf; |
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} |
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/* Wait queue for /sys/kernel/security/tomoyo/audit. */ |
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static DECLARE_WAIT_QUEUE_HEAD(tomoyo_log_wait); |
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/* Structure for audit log. */ |
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struct tomoyo_log { |
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struct list_head list; |
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char *log; |
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int size; |
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}; |
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/* The list for "struct tomoyo_log". */ |
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static LIST_HEAD(tomoyo_log); |
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/* Lock for "struct list_head tomoyo_log". */ |
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static DEFINE_SPINLOCK(tomoyo_log_lock); |
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/* Length of "struct list_head tomoyo_log". */ |
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static unsigned int tomoyo_log_count; |
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/** |
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* tomoyo_get_audit - Get audit mode. |
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* |
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* @ns: Pointer to "struct tomoyo_policy_namespace". |
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* @profile: Profile number. |
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* @index: Index number of functionality. |
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* @matched_acl: Pointer to "struct tomoyo_acl_info". |
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* @is_granted: True if granted log, false otherwise. |
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* |
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* Returns true if this request should be audited, false otherwise. |
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*/ |
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static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns, |
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const u8 profile, const u8 index, |
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const struct tomoyo_acl_info *matched_acl, |
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const bool is_granted) |
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{ |
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u8 mode; |
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const u8 category = tomoyo_index2category[index] + |
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TOMOYO_MAX_MAC_INDEX; |
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struct tomoyo_profile *p; |
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if (!tomoyo_policy_loaded) |
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return false; |
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p = tomoyo_profile(ns, profile); |
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if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG]) |
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return false; |
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if (is_granted && matched_acl && matched_acl->cond && |
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matched_acl->cond->grant_log != TOMOYO_GRANTLOG_AUTO) |
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return matched_acl->cond->grant_log == TOMOYO_GRANTLOG_YES; |
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mode = p->config[index]; |
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if (mode == TOMOYO_CONFIG_USE_DEFAULT) |
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mode = p->config[category]; |
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if (mode == TOMOYO_CONFIG_USE_DEFAULT) |
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mode = p->default_config; |
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if (is_granted) |
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return mode & TOMOYO_CONFIG_WANT_GRANT_LOG; |
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return mode & TOMOYO_CONFIG_WANT_REJECT_LOG; |
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} |
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/** |
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* tomoyo_write_log2 - Write an audit log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @len: Buffer size needed for @fmt and @args. |
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* @fmt: The printf()'s format string. |
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* @args: va_list structure for @fmt. |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt, |
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va_list args) |
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{ |
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char *buf; |
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struct tomoyo_log *entry; |
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bool quota_exceeded = false; |
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if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type, |
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r->matched_acl, r->granted)) |
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goto out; |
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buf = tomoyo_init_log(r, len, fmt, args); |
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if (!buf) |
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goto out; |
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entry = kzalloc(sizeof(*entry), GFP_NOFS); |
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if (!entry) { |
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kfree(buf); |
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goto out; |
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} |
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entry->log = buf; |
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len = tomoyo_round2(strlen(buf) + 1); |
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/* |
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* The entry->size is used for memory quota checks. |
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* Don't go beyond strlen(entry->log). |
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*/ |
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entry->size = len + tomoyo_round2(sizeof(*entry)); |
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spin_lock(&tomoyo_log_lock); |
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if (tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT] && |
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tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] + entry->size >= |
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tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT]) { |
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quota_exceeded = true; |
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} else { |
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tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] += entry->size; |
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list_add_tail(&entry->list, &tomoyo_log); |
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tomoyo_log_count++; |
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} |
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spin_unlock(&tomoyo_log_lock); |
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if (quota_exceeded) { |
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kfree(buf); |
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kfree(entry); |
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goto out; |
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} |
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wake_up(&tomoyo_log_wait); |
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out: |
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return; |
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} |
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/** |
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* tomoyo_write_log - Write an audit log. |
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* |
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* @r: Pointer to "struct tomoyo_request_info". |
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* @fmt: The printf()'s format string, followed by parameters. |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...) |
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{ |
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va_list args; |
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int len; |
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va_start(args, fmt); |
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len = vsnprintf((char *) &len, 1, fmt, args) + 1; |
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va_end(args); |
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va_start(args, fmt); |
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tomoyo_write_log2(r, len, fmt, args); |
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va_end(args); |
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} |
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/** |
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* tomoyo_read_log - Read an audit log. |
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* |
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* @head: Pointer to "struct tomoyo_io_buffer". |
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* |
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* Returns nothing. |
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*/ |
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void tomoyo_read_log(struct tomoyo_io_buffer *head) |
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{ |
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struct tomoyo_log *ptr = NULL; |
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if (head->r.w_pos) |
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return; |
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kfree(head->read_buf); |
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head->read_buf = NULL; |
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spin_lock(&tomoyo_log_lock); |
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if (!list_empty(&tomoyo_log)) { |
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ptr = list_entry(tomoyo_log.next, typeof(*ptr), list); |
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list_del(&ptr->list); |
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tomoyo_log_count--; |
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tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] -= ptr->size; |
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} |
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spin_unlock(&tomoyo_log_lock); |
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if (ptr) { |
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head->read_buf = ptr->log; |
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head->r.w[head->r.w_pos++] = head->read_buf; |
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kfree(ptr); |
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} |
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} |
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/** |
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* tomoyo_poll_log - Wait for an audit log. |
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* |
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* @file: Pointer to "struct file". |
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* @wait: Pointer to "poll_table". Maybe NULL. |
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* |
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* Returns EPOLLIN | EPOLLRDNORM when ready to read an audit log. |
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*/ |
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__poll_t tomoyo_poll_log(struct file *file, poll_table *wait) |
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{ |
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if (tomoyo_log_count) |
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return EPOLLIN | EPOLLRDNORM; |
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poll_wait(file, &tomoyo_log_wait, wait); |
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if (tomoyo_log_count) |
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return EPOLLIN | EPOLLRDNORM; |
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return 0; |
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}
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