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kernel/auditfilter.c
32.8 KB
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/* auditfilter.c -- filtering of audit events * * Copyright 2003-2004 Red Hat, Inc. * Copyright 2005 Hewlett-Packard Development Company, L.P. * Copyright 2005 IBM Corporation * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h> #include <linux/audit.h> #include <linux/kthread.h> |
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#include <linux/mutex.h> #include <linux/fs.h> #include <linux/namei.h> |
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#include <linux/netlink.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/security.h> |
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#include "audit.h" |
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/* * Locking model: * * audit_filter_mutex: * Synchronizes writes and blocking reads of audit's filterlist * data. Rcu is used to traverse the filterlist and access * contents of structs audit_entry, audit_watch and opaque |
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* LSM rules during filtering. If modified, these structures |
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* must be copied and replace their counterparts in the filterlist. * An audit_parent struct is not accessed during filtering, so may * be written directly provided audit_filter_mutex is held. */ |
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/* Audit filter lists, defined in <linux/audit.h> */ |
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struct list_head audit_filter_list[AUDIT_NR_FILTERS] = { LIST_HEAD_INIT(audit_filter_list[0]), LIST_HEAD_INIT(audit_filter_list[1]), LIST_HEAD_INIT(audit_filter_list[2]), LIST_HEAD_INIT(audit_filter_list[3]), LIST_HEAD_INIT(audit_filter_list[4]), LIST_HEAD_INIT(audit_filter_list[5]), #if AUDIT_NR_FILTERS != 6 #error Fix audit_filter_list initialiser #endif }; |
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static struct list_head audit_rules_list[AUDIT_NR_FILTERS] = { LIST_HEAD_INIT(audit_rules_list[0]), LIST_HEAD_INIT(audit_rules_list[1]), LIST_HEAD_INIT(audit_rules_list[2]), LIST_HEAD_INIT(audit_rules_list[3]), LIST_HEAD_INIT(audit_rules_list[4]), LIST_HEAD_INIT(audit_rules_list[5]), }; |
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|
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DEFINE_MUTEX(audit_filter_mutex); |
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|
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static inline void audit_free_rule(struct audit_entry *e) |
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{ |
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int i; |
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struct audit_krule *erule = &e->rule; |
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|
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/* some rules don't have associated watches */ |
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if (erule->watch) audit_put_watch(erule->watch); if (erule->fields) for (i = 0; i < erule->field_count; i++) { struct audit_field *f = &erule->fields[i]; |
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kfree(f->lsm_str); security_audit_rule_free(f->lsm_rule); |
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} |
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kfree(erule->fields); kfree(erule->filterkey); |
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kfree(e); } |
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void audit_free_rule_rcu(struct rcu_head *head) |
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{ struct audit_entry *e = container_of(head, struct audit_entry, rcu); audit_free_rule(e); } |
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/* Initialize an audit filterlist entry. */ static inline struct audit_entry *audit_init_entry(u32 field_count) { struct audit_entry *entry; struct audit_field *fields; entry = kzalloc(sizeof(*entry), GFP_KERNEL); if (unlikely(!entry)) return NULL; fields = kzalloc(sizeof(*fields) * field_count, GFP_KERNEL); if (unlikely(!fields)) { kfree(entry); return NULL; } entry->rule.fields = fields; return entry; } |
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/* Unpack a filter field's string representation from user-space * buffer. */ |
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char *audit_unpack_string(void **bufp, size_t *remain, size_t len) |
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{ char *str; if (!*bufp || (len == 0) || (len > *remain)) return ERR_PTR(-EINVAL); /* Of the currently implemented string fields, PATH_MAX * defines the longest valid length. */ if (len > PATH_MAX) return ERR_PTR(-ENAMETOOLONG); str = kmalloc(len + 1, GFP_KERNEL); if (unlikely(!str)) return ERR_PTR(-ENOMEM); memcpy(str, *bufp, len); str[len] = 0; *bufp += len; *remain -= len; return str; } |
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/* Translate an inode field to kernel respresentation. */ static inline int audit_to_inode(struct audit_krule *krule, struct audit_field *f) { if (krule->listnr != AUDIT_FILTER_EXIT || |
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krule->watch || krule->inode_f || krule->tree || (f->op != Audit_equal && f->op != Audit_not_equal)) |
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return -EINVAL; krule->inode_f = f; return 0; } |
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static __u32 *classes[AUDIT_SYSCALL_CLASSES]; int __init audit_register_class(int class, unsigned *list) { __u32 *p = kzalloc(AUDIT_BITMASK_SIZE * sizeof(__u32), GFP_KERNEL); if (!p) return -ENOMEM; while (*list != ~0U) { unsigned n = *list++; if (n >= AUDIT_BITMASK_SIZE * 32 - AUDIT_SYSCALL_CLASSES) { kfree(p); return -EINVAL; } p[AUDIT_WORD(n)] |= AUDIT_BIT(n); } if (class >= AUDIT_SYSCALL_CLASSES || classes[class]) { kfree(p); return -EINVAL; } classes[class] = p; return 0; } |
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int audit_match_class(int class, unsigned syscall) { |
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if (unlikely(syscall >= AUDIT_BITMASK_SIZE * 32)) |
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return 0; if (unlikely(class >= AUDIT_SYSCALL_CLASSES || !classes[class])) return 0; return classes[class][AUDIT_WORD(syscall)] & AUDIT_BIT(syscall); } |
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#ifdef CONFIG_AUDITSYSCALL |
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static inline int audit_match_class_bits(int class, u32 *mask) { int i; if (classes[class]) { for (i = 0; i < AUDIT_BITMASK_SIZE; i++) if (mask[i] & classes[class][i]) return 0; } return 1; } static int audit_match_signal(struct audit_entry *entry) { struct audit_field *arch = entry->rule.arch_f; if (!arch) { /* When arch is unspecified, we must check both masks on biarch * as syscall number alone is ambiguous. */ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, entry->rule.mask) && audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, entry->rule.mask)); } switch(audit_classify_arch(arch->val)) { case 0: /* native */ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL, entry->rule.mask)); case 1: /* 32bit on biarch */ return (audit_match_class_bits(AUDIT_CLASS_SIGNAL_32, entry->rule.mask)); default: return 1; } } |
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#endif |
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|
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/* Common user-space to kernel rule translation. */ static inline struct audit_entry *audit_to_entry_common(struct audit_rule *rule) { unsigned listnr; struct audit_entry *entry; |
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int i, err; err = -EINVAL; listnr = rule->flags & ~AUDIT_FILTER_PREPEND; switch(listnr) { default: goto exit_err; |
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#ifdef CONFIG_AUDITSYSCALL case AUDIT_FILTER_ENTRY: |
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if (rule->action == AUDIT_ALWAYS) goto exit_err; |
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case AUDIT_FILTER_EXIT: case AUDIT_FILTER_TASK: #endif |
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case AUDIT_FILTER_USER: case AUDIT_FILTER_TYPE: |
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; } |
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if (unlikely(rule->action == AUDIT_POSSIBLE)) { printk(KERN_ERR "AUDIT_POSSIBLE is deprecated "); goto exit_err; } if (rule->action != AUDIT_NEVER && rule->action != AUDIT_ALWAYS) |
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goto exit_err; if (rule->field_count > AUDIT_MAX_FIELDS) goto exit_err; err = -ENOMEM; |
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entry = audit_init_entry(rule->field_count); if (!entry) |
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goto exit_err; |
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entry->rule.flags = rule->flags & AUDIT_FILTER_PREPEND; entry->rule.listnr = listnr; entry->rule.action = rule->action; entry->rule.field_count = rule->field_count; |
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for (i = 0; i < AUDIT_BITMASK_SIZE; i++) entry->rule.mask[i] = rule->mask[i]; |
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for (i = 0; i < AUDIT_SYSCALL_CLASSES; i++) { int bit = AUDIT_BITMASK_SIZE * 32 - i - 1; __u32 *p = &entry->rule.mask[AUDIT_WORD(bit)]; __u32 *class; if (!(*p & AUDIT_BIT(bit))) continue; *p &= ~AUDIT_BIT(bit); class = classes[i]; if (class) { int j; for (j = 0; j < AUDIT_BITMASK_SIZE; j++) entry->rule.mask[j] |= class[j]; } } |
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return entry; exit_err: return ERR_PTR(err); } |
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static u32 audit_ops[] = { [Audit_equal] = AUDIT_EQUAL, [Audit_not_equal] = AUDIT_NOT_EQUAL, [Audit_bitmask] = AUDIT_BIT_MASK, [Audit_bittest] = AUDIT_BIT_TEST, [Audit_lt] = AUDIT_LESS_THAN, [Audit_gt] = AUDIT_GREATER_THAN, [Audit_le] = AUDIT_LESS_THAN_OR_EQUAL, [Audit_ge] = AUDIT_GREATER_THAN_OR_EQUAL, }; static u32 audit_to_op(u32 op) { u32 n; for (n = Audit_equal; n < Audit_bad && audit_ops[n] != op; n++) ; return n; } |
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/* check if an audit field is valid */ |
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static int audit_field_valid(struct audit_entry *entry, struct audit_field *f) |
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{ |
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switch(f->type) { case AUDIT_MSGTYPE: if (entry->rule.listnr != AUDIT_FILTER_TYPE && entry->rule.listnr != AUDIT_FILTER_USER) return -EINVAL; break; }; |
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|
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switch(f->type) { default: return -EINVAL; case AUDIT_UID: case AUDIT_EUID: case AUDIT_SUID: case AUDIT_FSUID: case AUDIT_LOGINUID: case AUDIT_OBJ_UID: case AUDIT_GID: case AUDIT_EGID: case AUDIT_SGID: case AUDIT_FSGID: case AUDIT_OBJ_GID: case AUDIT_PID: case AUDIT_PERS: case AUDIT_MSGTYPE: case AUDIT_PPID: case AUDIT_DEVMAJOR: case AUDIT_DEVMINOR: case AUDIT_EXIT: case AUDIT_SUCCESS: /* bit ops are only useful on syscall args */ if (f->op == Audit_bitmask || f->op == Audit_bittest) return -EINVAL; break; case AUDIT_ARG0: case AUDIT_ARG1: case AUDIT_ARG2: case AUDIT_ARG3: case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: case AUDIT_WATCH: case AUDIT_DIR: case AUDIT_FILTERKEY: break; |
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case AUDIT_LOGINUID_SET: if ((f->val != 0) && (f->val != 1)) return -EINVAL; /* FALL THROUGH */ |
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case AUDIT_ARCH: if (f->op != Audit_not_equal && f->op != Audit_equal) return -EINVAL; break; case AUDIT_PERM: if (f->val & ~15) return -EINVAL; break; case AUDIT_FILETYPE: if (f->val & ~S_IFMT) return -EINVAL; break; case AUDIT_FIELD_COMPARE: if (f->val > AUDIT_MAX_FIELD_COMPARE) return -EINVAL; break; }; |
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return 0; |
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} |
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/* Translate struct audit_rule_data to kernel's rule respresentation. */ static struct audit_entry *audit_data_to_entry(struct audit_rule_data *data, size_t datasz) |
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{ |
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int err = 0; struct audit_entry *entry; void *bufp; |
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size_t remain = datasz - sizeof(struct audit_rule_data); |
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int i; |
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char *str; |
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|
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entry = audit_to_entry_common((struct audit_rule *)data); if (IS_ERR(entry)) goto exit_nofree; |
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|
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bufp = data->buf; entry->rule.vers_ops = 2; for (i = 0; i < data->field_count; i++) { struct audit_field *f = &entry->rule.fields[i]; err = -EINVAL; |
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f->op = audit_to_op(data->fieldflags[i]); if (f->op == Audit_bad) |
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goto exit_free; |
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f->type = data->fields[i]; |
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f->val = data->values[i]; |
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f->uid = INVALID_UID; f->gid = INVALID_GID; |
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f->lsm_str = NULL; f->lsm_rule = NULL; |
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|
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/* Support legacy tests for a valid loginuid */ |
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if ((f->type == AUDIT_LOGINUID) && (f->val == ~0U)) { |
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f->type = AUDIT_LOGINUID_SET; f->val = 0; } |
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err = audit_field_valid(entry, f); if (err) goto exit_free; err = -EINVAL; |
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switch (f->type) { |
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case AUDIT_LOGINUID: |
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case AUDIT_UID: case AUDIT_EUID: case AUDIT_SUID: case AUDIT_FSUID: |
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case AUDIT_OBJ_UID: |
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f->uid = make_kuid(current_user_ns(), f->val); if (!uid_valid(f->uid)) goto exit_free; break; |
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case AUDIT_GID: case AUDIT_EGID: case AUDIT_SGID: case AUDIT_FSGID: |
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case AUDIT_OBJ_GID: |
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f->gid = make_kgid(current_user_ns(), f->val); if (!gid_valid(f->gid)) goto exit_free; break; |
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case AUDIT_ARCH: entry->rule.arch_f = f; break; |
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case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
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case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
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str = audit_unpack_string(&bufp, &remain, f->val); if (IS_ERR(str)) goto exit_free; entry->rule.buflen += f->val; |
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err = security_audit_rule_init(f->type, f->op, str, |
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(void **)&f->lsm_rule); |
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/* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (err == -EINVAL) { |
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printk(KERN_WARNING "audit rule for LSM " |
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"\'%s\' is invalid ", str); err = 0; } if (err) { kfree(str); goto exit_free; } else |
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f->lsm_str = str; |
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break; |
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case AUDIT_WATCH: str = audit_unpack_string(&bufp, &remain, f->val); if (IS_ERR(str)) goto exit_free; entry->rule.buflen += f->val; err = audit_to_watch(&entry->rule, str, f->val, f->op); if (err) { kfree(str); goto exit_free; } break; |
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case AUDIT_DIR: str = audit_unpack_string(&bufp, &remain, f->val); if (IS_ERR(str)) goto exit_free; entry->rule.buflen += f->val; err = audit_make_tree(&entry->rule, str, f->op); kfree(str); if (err) goto exit_free; break; |
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case AUDIT_INODE: err = audit_to_inode(&entry->rule, f); if (err) goto exit_free; break; |
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case AUDIT_FILTERKEY: |
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if (entry->rule.filterkey || f->val > AUDIT_MAX_KEY_LEN) goto exit_free; str = audit_unpack_string(&bufp, &remain, f->val); if (IS_ERR(str)) goto exit_free; entry->rule.buflen += f->val; entry->rule.filterkey = str; break; |
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} } |
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if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal) entry->rule.inode_f = NULL; |
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exit_nofree: return entry; exit_free: |
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if (entry->rule.watch) audit_put_watch(entry->rule.watch); /* matches initial get */ if (entry->rule.tree) audit_put_tree(entry->rule.tree); /* that's the temporary one */ |
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audit_free_rule(entry); return ERR_PTR(err); } /* Pack a filter field's string representation into data block. */ |
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static inline size_t audit_pack_string(void **bufp, const char *str) |
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{ size_t len = strlen(str); memcpy(*bufp, str, len); *bufp += len; return len; } |
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/* Translate kernel rule respresentation to struct audit_rule_data. */ static struct audit_rule_data *audit_krule_to_data(struct audit_krule *krule) { struct audit_rule_data *data; void *bufp; int i; data = kmalloc(sizeof(*data) + krule->buflen, GFP_KERNEL); if (unlikely(!data)) |
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return NULL; |
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memset(data, 0, sizeof(*data)); data->flags = krule->flags | krule->listnr; data->action = krule->action; data->field_count = krule->field_count; bufp = data->buf; for (i = 0; i < data->field_count; i++) { struct audit_field *f = &krule->fields[i]; data->fields[i] = f->type; |
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data->fieldflags[i] = audit_ops[f->op]; |
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switch(f->type) { |
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case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
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case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
3dc7e3153 [PATCH] support f... |
570 |
data->buflen += data->values[i] = |
04305e4af Audit: Final rena... |
571 |
audit_pack_string(&bufp, f->lsm_str); |
3dc7e3153 [PATCH] support f... |
572 |
break; |
f368c07d7 [PATCH] audit: pa... |
573 574 |
case AUDIT_WATCH: data->buflen += data->values[i] = |
cfcad62c7 audit: seperate a... |
575 576 |
audit_pack_string(&bufp, audit_watch_path(krule->watch)); |
f368c07d7 [PATCH] audit: pa... |
577 |
break; |
74c3cbe33 [PATCH] audit: wa... |
578 579 580 581 582 |
case AUDIT_DIR: data->buflen += data->values[i] = audit_pack_string(&bufp, audit_tree_path(krule->tree)); break; |
5adc8a6ad [PATCH] add rule ... |
583 584 585 586 |
case AUDIT_FILTERKEY: data->buflen += data->values[i] = audit_pack_string(&bufp, krule->filterkey); break; |
93315ed6d [PATCH] audit str... |
587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 |
default: data->values[i] = f->val; } } for (i = 0; i < AUDIT_BITMASK_SIZE; i++) data->mask[i] = krule->mask[i]; return data; } /* Compare two rules in kernel format. Considered success if rules * don't match. */ static int audit_compare_rule(struct audit_krule *a, struct audit_krule *b) { int i; if (a->flags != b->flags || a->listnr != b->listnr || a->action != b->action || a->field_count != b->field_count) |
fe7752bab [PATCH] Fix audit... |
606 607 608 |
return 1; for (i = 0; i < a->field_count; i++) { |
93315ed6d [PATCH] audit str... |
609 610 |
if (a->fields[i].type != b->fields[i].type || a->fields[i].op != b->fields[i].op) |
fe7752bab [PATCH] Fix audit... |
611 |
return 1; |
93315ed6d [PATCH] audit str... |
612 613 |
switch(a->fields[i].type) { |
3a6b9f85c [PATCH] audit: re... |
614 615 616 617 618 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3 [PATCH] audit: su... |
619 620 621 622 623 |
case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
04305e4af Audit: Final rena... |
624 |
if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
3dc7e3153 [PATCH] support f... |
625 626 |
return 1; break; |
f368c07d7 [PATCH] audit: pa... |
627 |
case AUDIT_WATCH: |
cfcad62c7 audit: seperate a... |
628 629 |
if (strcmp(audit_watch_path(a->watch), audit_watch_path(b->watch))) |
f368c07d7 [PATCH] audit: pa... |
630 631 |
return 1; break; |
74c3cbe33 [PATCH] audit: wa... |
632 633 634 635 636 |
case AUDIT_DIR: if (strcmp(audit_tree_path(a->tree), audit_tree_path(b->tree))) return 1; break; |
5adc8a6ad [PATCH] add rule ... |
637 638 639 640 641 |
case AUDIT_FILTERKEY: /* both filterkeys exist based on above type compare */ if (strcmp(a->filterkey, b->filterkey)) return 1; break; |
ca57ec0f0 audit: Add typesp... |
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 |
case AUDIT_UID: case AUDIT_EUID: case AUDIT_SUID: case AUDIT_FSUID: case AUDIT_LOGINUID: case AUDIT_OBJ_UID: if (!uid_eq(a->fields[i].uid, b->fields[i].uid)) return 1; break; case AUDIT_GID: case AUDIT_EGID: case AUDIT_SGID: case AUDIT_FSGID: case AUDIT_OBJ_GID: if (!gid_eq(a->fields[i].gid, b->fields[i].gid)) return 1; break; |
93315ed6d [PATCH] audit str... |
659 660 661 662 |
default: if (a->fields[i].val != b->fields[i].val) return 1; } |
fe7752bab [PATCH] Fix audit... |
663 664 665 666 667 668 669 670 |
} for (i = 0; i < AUDIT_BITMASK_SIZE; i++) if (a->mask[i] != b->mask[i]) return 1; return 0; } |
04305e4af Audit: Final rena... |
671 |
/* Duplicate LSM field information. The lsm_rule is opaque, so must be |
3dc7e3153 [PATCH] support f... |
672 |
* re-initialized. */ |
d7a96f3a1 Audit: internally... |
673 |
static inline int audit_dupe_lsm_field(struct audit_field *df, |
3dc7e3153 [PATCH] support f... |
674 675 676 |
struct audit_field *sf) { int ret = 0; |
04305e4af Audit: Final rena... |
677 |
char *lsm_str; |
3dc7e3153 [PATCH] support f... |
678 |
|
04305e4af Audit: Final rena... |
679 680 681 |
/* our own copy of lsm_str */ lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); if (unlikely(!lsm_str)) |
3e1fbd12c [PATCH] audit: fi... |
682 |
return -ENOMEM; |
04305e4af Audit: Final rena... |
683 |
df->lsm_str = lsm_str; |
3dc7e3153 [PATCH] support f... |
684 |
|
04305e4af Audit: Final rena... |
685 686 687 |
/* our own (refreshed) copy of lsm_rule */ ret = security_audit_rule_init(df->type, df->op, df->lsm_str, (void **)&df->lsm_rule); |
3dc7e3153 [PATCH] support f... |
688 689 690 |
/* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (ret == -EINVAL) { |
d7a96f3a1 Audit: internally... |
691 |
printk(KERN_WARNING "audit rule for LSM \'%s\' is " |
04305e4af Audit: Final rena... |
692 693 |
"invalid ", df->lsm_str); |
3dc7e3153 [PATCH] support f... |
694 695 696 697 698 699 700 |
ret = 0; } return ret; } /* Duplicate an audit rule. This will be a deep copy with the exception |
d7a96f3a1 Audit: internally... |
701 |
* of the watch - that pointer is carried over. The LSM specific fields |
3dc7e3153 [PATCH] support f... |
702 |
* will be updated in the copy. The point is to be able to replace the old |
f368c07d7 [PATCH] audit: pa... |
703 704 705 |
* rule with the new rule in the filterlist, then free the old rule. * The rlist element is undefined; list manipulations are handled apart from * the initial copy. */ |
ae7b8f410 Audit: clean up t... |
706 |
struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
3dc7e3153 [PATCH] support f... |
707 708 709 710 |
{ u32 fcount = old->field_count; struct audit_entry *entry; struct audit_krule *new; |
5adc8a6ad [PATCH] add rule ... |
711 |
char *fk; |
3dc7e3153 [PATCH] support f... |
712 713 714 715 716 717 718 719 720 721 722 723 724 |
int i, err = 0; entry = audit_init_entry(fcount); if (unlikely(!entry)) return ERR_PTR(-ENOMEM); new = &entry->rule; new->vers_ops = old->vers_ops; new->flags = old->flags; new->listnr = old->listnr; new->action = old->action; for (i = 0; i < AUDIT_BITMASK_SIZE; i++) new->mask[i] = old->mask[i]; |
0590b9335 fixing audit rule... |
725 |
new->prio = old->prio; |
3dc7e3153 [PATCH] support f... |
726 |
new->buflen = old->buflen; |
f368c07d7 [PATCH] audit: pa... |
727 |
new->inode_f = old->inode_f; |
3dc7e3153 [PATCH] support f... |
728 |
new->field_count = old->field_count; |
ae7b8f410 Audit: clean up t... |
729 |
|
74c3cbe33 [PATCH] audit: wa... |
730 731 732 733 734 735 736 737 |
/* * note that we are OK with not refcounting here; audit_match_tree() * never dereferences tree and we can't get false positives there * since we'd have to have rule gone from the list *and* removed * before the chunks found by lookup had been allocated, i.e. before * the beginning of list scan. */ new->tree = old->tree; |
3dc7e3153 [PATCH] support f... |
738 |
memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
04305e4af Audit: Final rena... |
739 |
/* deep copy this information, updating the lsm_rule fields, because |
3dc7e3153 [PATCH] support f... |
740 741 742 |
* the originals will all be freed when the old rule is freed. */ for (i = 0; i < fcount; i++) { switch (new->fields[i].type) { |
3a6b9f85c [PATCH] audit: re... |
743 744 745 746 747 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3 [PATCH] audit: su... |
748 749 750 751 752 |
case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
d7a96f3a1 Audit: internally... |
753 |
err = audit_dupe_lsm_field(&new->fields[i], |
3dc7e3153 [PATCH] support f... |
754 |
&old->fields[i]); |
5adc8a6ad [PATCH] add rule ... |
755 756 757 758 759 760 761 |
break; case AUDIT_FILTERKEY: fk = kstrdup(old->filterkey, GFP_KERNEL); if (unlikely(!fk)) err = -ENOMEM; else new->filterkey = fk; |
3dc7e3153 [PATCH] support f... |
762 763 764 765 766 767 |
} if (err) { audit_free_rule(entry); return ERR_PTR(err); } } |
ae7b8f410 Audit: clean up t... |
768 769 770 |
if (old->watch) { audit_get_watch(old->watch); new->watch = old->watch; |
f368c07d7 [PATCH] audit: pa... |
771 |
} |
3dc7e3153 [PATCH] support f... |
772 773 |
return entry; } |
f368c07d7 [PATCH] audit: pa... |
774 775 776 |
/* Find an existing audit rule. * Caller must hold audit_filter_mutex to prevent stale rule data. */ static struct audit_entry *audit_find_rule(struct audit_entry *entry, |
36c4f1b18 clean up audit_ru... |
777 |
struct list_head **p) |
f368c07d7 [PATCH] audit: pa... |
778 779 |
{ struct audit_entry *e, *found = NULL; |
36c4f1b18 clean up audit_ru... |
780 |
struct list_head *list; |
f368c07d7 [PATCH] audit: pa... |
781 |
int h; |
36c4f1b18 clean up audit_ru... |
782 783 784 785 |
if (entry->rule.inode_f) { h = audit_hash_ino(entry->rule.inode_f->val); *p = list = &audit_inode_hash[h]; } else if (entry->rule.watch) { |
f368c07d7 [PATCH] audit: pa... |
786 787 788 789 790 791 792 793 794 795 |
/* we don't know the inode number, so must walk entire hash */ for (h = 0; h < AUDIT_INODE_BUCKETS; h++) { list = &audit_inode_hash[h]; list_for_each_entry(e, list, list) if (!audit_compare_rule(&entry->rule, &e->rule)) { found = e; goto out; } } goto out; |
36c4f1b18 clean up audit_ru... |
796 797 |
} else { *p = list = &audit_filter_list[entry->rule.listnr]; |
f368c07d7 [PATCH] audit: pa... |
798 799 800 801 802 803 804 805 806 807 808 |
} list_for_each_entry(e, list, list) if (!audit_compare_rule(&entry->rule, &e->rule)) { found = e; goto out; } out: return found; } |
0590b9335 fixing audit rule... |
809 810 |
static u64 prio_low = ~0ULL/2; static u64 prio_high = ~0ULL/2 - 1; |
f368c07d7 [PATCH] audit: pa... |
811 |
/* Add rule to given filterlist if not a duplicate. */ |
36c4f1b18 clean up audit_ru... |
812 |
static inline int audit_add_rule(struct audit_entry *entry) |
fe7752bab [PATCH] Fix audit... |
813 |
{ |
93315ed6d [PATCH] audit str... |
814 |
struct audit_entry *e; |
f368c07d7 [PATCH] audit: pa... |
815 |
struct audit_watch *watch = entry->rule.watch; |
74c3cbe33 [PATCH] audit: wa... |
816 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18 clean up audit_ru... |
817 |
struct list_head *list; |
ae7b8f410 Audit: clean up t... |
818 |
int err; |
471a5c7c8 [PATCH] introduce... |
819 820 821 822 823 824 825 826 |
#ifdef CONFIG_AUDITSYSCALL int dont_count = 0; /* If either of these, don't count towards total */ if (entry->rule.listnr == AUDIT_FILTER_USER || entry->rule.listnr == AUDIT_FILTER_TYPE) dont_count = 1; #endif |
f368c07d7 [PATCH] audit: pa... |
827 |
|
f368c07d7 [PATCH] audit: pa... |
828 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18 clean up audit_ru... |
829 |
e = audit_find_rule(entry, &list); |
f368c07d7 [PATCH] audit: pa... |
830 |
if (e) { |
35fe4d0b1 Audit: move audit... |
831 |
mutex_unlock(&audit_filter_mutex); |
f368c07d7 [PATCH] audit: pa... |
832 |
err = -EEXIST; |
74c3cbe33 [PATCH] audit: wa... |
833 834 835 |
/* normally audit_add_tree_rule() will free it on failure */ if (tree) audit_put_tree(tree); |
f368c07d7 [PATCH] audit: pa... |
836 837 |
goto error; } |
fe7752bab [PATCH] Fix audit... |
838 |
|
f368c07d7 [PATCH] audit: pa... |
839 840 |
if (watch) { /* audit_filter_mutex is dropped and re-taken during this call */ |
ae7b8f410 Audit: clean up t... |
841 |
err = audit_add_watch(&entry->rule, &list); |
f368c07d7 [PATCH] audit: pa... |
842 843 |
if (err) { mutex_unlock(&audit_filter_mutex); |
2f992ee85 kernel/auditfilte... |
844 845 846 847 848 849 |
/* * normally audit_add_tree_rule() will free it * on failure */ if (tree) audit_put_tree(tree); |
f368c07d7 [PATCH] audit: pa... |
850 851 |
goto error; } |
fe7752bab [PATCH] Fix audit... |
852 |
} |
74c3cbe33 [PATCH] audit: wa... |
853 854 855 856 857 858 859 |
if (tree) { err = audit_add_tree_rule(&entry->rule); if (err) { mutex_unlock(&audit_filter_mutex); goto error; } } |
fe7752bab [PATCH] Fix audit... |
860 |
|
0590b9335 fixing audit rule... |
861 862 863 864 865 866 867 |
entry->rule.prio = ~0ULL; if (entry->rule.listnr == AUDIT_FILTER_EXIT) { if (entry->rule.flags & AUDIT_FILTER_PREPEND) entry->rule.prio = ++prio_high; else entry->rule.prio = --prio_low; } |
fe7752bab [PATCH] Fix audit... |
868 |
if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
e45aa212e audit rules order... |
869 870 |
list_add(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab [PATCH] Fix audit... |
871 |
list_add_rcu(&entry->list, list); |
6a2bceec0 [PATCH] fix AUDIT... |
872 |
entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
fe7752bab [PATCH] Fix audit... |
873 |
} else { |
e45aa212e audit rules order... |
874 875 |
list_add_tail(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab [PATCH] Fix audit... |
876 877 |
list_add_tail_rcu(&entry->list, list); } |
471a5c7c8 [PATCH] introduce... |
878 879 880 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules++; |
e54dc2431 [PATCH] audit sig... |
881 882 883 |
if (!audit_match_signal(entry)) audit_signals++; |
471a5c7c8 [PATCH] introduce... |
884 |
#endif |
f368c07d7 [PATCH] audit: pa... |
885 |
mutex_unlock(&audit_filter_mutex); |
fe7752bab [PATCH] Fix audit... |
886 |
|
f368c07d7 [PATCH] audit: pa... |
887 888 889 |
return 0; error: |
f368c07d7 [PATCH] audit: pa... |
890 891 892 |
if (watch) audit_put_watch(watch); /* tmp watch, matches initial get */ return err; |
fe7752bab [PATCH] Fix audit... |
893 |
} |
f368c07d7 [PATCH] audit: pa... |
894 |
/* Remove an existing rule from filterlist. */ |
36c4f1b18 clean up audit_ru... |
895 |
static inline int audit_del_rule(struct audit_entry *entry) |
fe7752bab [PATCH] Fix audit... |
896 897 |
{ struct audit_entry *e; |
cfcad62c7 audit: seperate a... |
898 |
struct audit_watch *watch = entry->rule.watch; |
74c3cbe33 [PATCH] audit: wa... |
899 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18 clean up audit_ru... |
900 |
struct list_head *list; |
36c4f1b18 clean up audit_ru... |
901 |
int ret = 0; |
471a5c7c8 [PATCH] introduce... |
902 903 904 905 906 907 908 909 |
#ifdef CONFIG_AUDITSYSCALL int dont_count = 0; /* If either of these, don't count towards total */ if (entry->rule.listnr == AUDIT_FILTER_USER || entry->rule.listnr == AUDIT_FILTER_TYPE) dont_count = 1; #endif |
f368c07d7 [PATCH] audit: pa... |
910 |
|
f368c07d7 [PATCH] audit: pa... |
911 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18 clean up audit_ru... |
912 |
e = audit_find_rule(entry, &list); |
f368c07d7 [PATCH] audit: pa... |
913 914 915 916 917 |
if (!e) { mutex_unlock(&audit_filter_mutex); ret = -ENOENT; goto out; } |
cfcad62c7 audit: seperate a... |
918 |
if (e->rule.watch) |
a05fb6cc5 audit: do not get... |
919 |
audit_remove_watch_rule(&e->rule); |
f368c07d7 [PATCH] audit: pa... |
920 |
|
74c3cbe33 [PATCH] audit: wa... |
921 922 |
if (e->rule.tree) audit_remove_tree_rule(&e->rule); |
f368c07d7 [PATCH] audit: pa... |
923 |
list_del_rcu(&e->list); |
e45aa212e audit rules order... |
924 |
list_del(&e->rule.list); |
f368c07d7 [PATCH] audit: pa... |
925 |
call_rcu(&e->rcu, audit_free_rule_rcu); |
471a5c7c8 [PATCH] introduce... |
926 927 928 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules--; |
e54dc2431 [PATCH] audit sig... |
929 930 931 |
if (!audit_match_signal(entry)) audit_signals--; |
471a5c7c8 [PATCH] introduce... |
932 |
#endif |
f368c07d7 [PATCH] audit: pa... |
933 |
mutex_unlock(&audit_filter_mutex); |
f368c07d7 [PATCH] audit: pa... |
934 |
out: |
cfcad62c7 audit: seperate a... |
935 936 |
if (watch) audit_put_watch(watch); /* match initial get */ |
74c3cbe33 [PATCH] audit: wa... |
937 938 |
if (tree) audit_put_tree(tree); /* that's the temporary one */ |
f368c07d7 [PATCH] audit: pa... |
939 940 |
return ret; |
fe7752bab [PATCH] Fix audit... |
941 |
} |
93315ed6d [PATCH] audit str... |
942 |
/* List rules using struct audit_rule_data. */ |
9044e6bca [PATCH] fix deadl... |
943 |
static void audit_list_rules(int pid, int seq, struct sk_buff_head *q) |
93315ed6d [PATCH] audit str... |
944 |
{ |
9044e6bca [PATCH] fix deadl... |
945 |
struct sk_buff *skb; |
e45aa212e audit rules order... |
946 |
struct audit_krule *r; |
93315ed6d [PATCH] audit str... |
947 |
int i; |
f368c07d7 [PATCH] audit: pa... |
948 949 |
/* This is a blocking read, so use audit_filter_mutex instead of rcu * iterator to sync with list writers. */ |
93315ed6d [PATCH] audit str... |
950 |
for (i=0; i<AUDIT_NR_FILTERS; i++) { |
e45aa212e audit rules order... |
951 |
list_for_each_entry(r, &audit_rules_list[i], list) { |
f368c07d7 [PATCH] audit: pa... |
952 |
struct audit_rule_data *data; |
e45aa212e audit rules order... |
953 |
data = audit_krule_to_data(r); |
f368c07d7 [PATCH] audit: pa... |
954 955 956 957 |
if (unlikely(!data)) break; skb = audit_make_reply(pid, seq, AUDIT_LIST_RULES, 0, 1, data, sizeof(*data) + data->buflen); |
9044e6bca [PATCH] fix deadl... |
958 959 |
if (skb) skb_queue_tail(q, skb); |
93315ed6d [PATCH] audit str... |
960 961 962 |
kfree(data); } } |
9044e6bca [PATCH] fix deadl... |
963 964 965 |
skb = audit_make_reply(pid, seq, AUDIT_LIST_RULES, 1, 1, NULL, 0); if (skb) skb_queue_tail(q, skb); |
93315ed6d [PATCH] audit str... |
966 |
} |
5adc8a6ad [PATCH] add rule ... |
967 |
/* Log rule additions and removals */ |
dc9eb698f audit: stop pushi... |
968 |
static void audit_log_rule_change(char *action, struct audit_krule *rule, int res) |
5adc8a6ad [PATCH] add rule ... |
969 970 |
{ struct audit_buffer *ab; |
dc9eb698f audit: stop pushi... |
971 972 |
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current)); u32 sessionid = audit_get_sessionid(current); |
5adc8a6ad [PATCH] add rule ... |
973 |
|
1a6b9f231 [AUDIT] make audi... |
974 975 |
if (!audit_enabled) return; |
5adc8a6ad [PATCH] add rule ... |
976 977 978 |
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); if (!ab) return; |
dc9eb698f audit: stop pushi... |
979 |
audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid); |
b122c3767 audit: use a cons... |
980 |
audit_log_task_context(ab); |
9d9609851 Audit: clean up a... |
981 982 983 |
audit_log_format(ab, " op="); audit_log_string(ab, action); audit_log_key(ab, rule->filterkey); |
5adc8a6ad [PATCH] add rule ... |
984 985 986 |
audit_log_format(ab, " list=%d res=%d", rule->listnr, res); audit_log_end(ab); } |
fe7752bab [PATCH] Fix audit... |
987 988 989 990 |
/** * audit_receive_filter - apply all rules to the specified message type * @type: audit message type * @pid: target pid for netlink audit messages |
fe7752bab [PATCH] Fix audit... |
991 992 |
* @seq: netlink audit message sequence (serial) number * @data: payload data |
93315ed6d [PATCH] audit str... |
993 |
* @datasz: size of payload data |
fe7752bab [PATCH] Fix audit... |
994 |
*/ |
dc9eb698f audit: stop pushi... |
995 |
int audit_receive_filter(int type, int pid, int seq, void *data, size_t datasz) |
fe7752bab [PATCH] Fix audit... |
996 997 |
{ struct task_struct *tsk; |
9044e6bca [PATCH] fix deadl... |
998 |
struct audit_netlink_list *dest; |
93315ed6d [PATCH] audit str... |
999 1000 |
int err = 0; struct audit_entry *entry; |
fe7752bab [PATCH] Fix audit... |
1001 1002 |
switch (type) { |
93315ed6d [PATCH] audit str... |
1003 |
case AUDIT_LIST_RULES: |
fe7752bab [PATCH] Fix audit... |
1004 1005 1006 1007 1008 |
/* We can't just spew out the rules here because we might fill * the available socket buffer space and deadlock waiting for * auditctl to read from it... which isn't ever going to * happen if we're actually running in the context of auditctl * trying to _send_ the stuff */ |
9ce34218a whitespace fixes:... |
1009 |
|
9044e6bca [PATCH] fix deadl... |
1010 |
dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); |
fe7752bab [PATCH] Fix audit... |
1011 1012 |
if (!dest) return -ENOMEM; |
9044e6bca [PATCH] fix deadl... |
1013 1014 |
dest->pid = pid; skb_queue_head_init(&dest->q); |
fe7752bab [PATCH] Fix audit... |
1015 |
|
f368c07d7 [PATCH] audit: pa... |
1016 |
mutex_lock(&audit_filter_mutex); |
189009091 audit: remove the... |
1017 |
audit_list_rules(pid, seq, &dest->q); |
f368c07d7 [PATCH] audit: pa... |
1018 |
mutex_unlock(&audit_filter_mutex); |
9044e6bca [PATCH] fix deadl... |
1019 1020 |
tsk = kthread_run(audit_send_list, dest, "audit_send_list"); |
fe7752bab [PATCH] Fix audit... |
1021 |
if (IS_ERR(tsk)) { |
9044e6bca [PATCH] fix deadl... |
1022 |
skb_queue_purge(&dest->q); |
fe7752bab [PATCH] Fix audit... |
1023 1024 1025 1026 |
kfree(dest); err = PTR_ERR(tsk); } break; |
93315ed6d [PATCH] audit str... |
1027 |
case AUDIT_ADD_RULE: |
189009091 audit: remove the... |
1028 |
entry = audit_data_to_entry(data, datasz); |
93315ed6d [PATCH] audit str... |
1029 1030 |
if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18 clean up audit_ru... |
1031 |
err = audit_add_rule(entry); |
dc9eb698f audit: stop pushi... |
1032 |
audit_log_rule_change("add rule", &entry->rule, !err); |
5d3301088 [PATCH] add/remov... |
1033 |
if (err) |
93315ed6d [PATCH] audit str... |
1034 |
audit_free_rule(entry); |
fe7752bab [PATCH] Fix audit... |
1035 |
break; |
93315ed6d [PATCH] audit str... |
1036 |
case AUDIT_DEL_RULE: |
189009091 audit: remove the... |
1037 |
entry = audit_data_to_entry(data, datasz); |
93315ed6d [PATCH] audit str... |
1038 1039 |
if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18 clean up audit_ru... |
1040 |
err = audit_del_rule(entry); |
dc9eb698f audit: stop pushi... |
1041 |
audit_log_rule_change("remove rule", &entry->rule, !err); |
93315ed6d [PATCH] audit str... |
1042 |
audit_free_rule(entry); |
fe7752bab [PATCH] Fix audit... |
1043 1044 1045 1046 1047 1048 1049 |
break; default: return -EINVAL; } return err; } |
5af75d8d5 audit: validate c... |
1050 |
int audit_comparator(u32 left, u32 op, u32 right) |
fe7752bab [PATCH] Fix audit... |
1051 1052 |
{ switch (op) { |
5af75d8d5 audit: validate c... |
1053 |
case Audit_equal: |
fe7752bab [PATCH] Fix audit... |
1054 |
return (left == right); |
5af75d8d5 audit: validate c... |
1055 |
case Audit_not_equal: |
fe7752bab [PATCH] Fix audit... |
1056 |
return (left != right); |
5af75d8d5 audit: validate c... |
1057 |
case Audit_lt: |
fe7752bab [PATCH] Fix audit... |
1058 |
return (left < right); |
5af75d8d5 audit: validate c... |
1059 |
case Audit_le: |
fe7752bab [PATCH] Fix audit... |
1060 |
return (left <= right); |
5af75d8d5 audit: validate c... |
1061 |
case Audit_gt: |
fe7752bab [PATCH] Fix audit... |
1062 |
return (left > right); |
5af75d8d5 audit: validate c... |
1063 |
case Audit_ge: |
fe7752bab [PATCH] Fix audit... |
1064 |
return (left >= right); |
5af75d8d5 audit: validate c... |
1065 |
case Audit_bitmask: |
74f2345b6 [PATCH] allow aud... |
1066 |
return (left & right); |
5af75d8d5 audit: validate c... |
1067 |
case Audit_bittest: |
74f2345b6 [PATCH] allow aud... |
1068 |
return ((left & right) == right); |
5af75d8d5 audit: validate c... |
1069 1070 1071 |
default: BUG(); return 0; |
fe7752bab [PATCH] Fix audit... |
1072 1073 |
} } |
ca57ec0f0 audit: Add typesp... |
1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 |
int audit_uid_comparator(kuid_t left, u32 op, kuid_t right) { switch (op) { case Audit_equal: return uid_eq(left, right); case Audit_not_equal: return !uid_eq(left, right); case Audit_lt: return uid_lt(left, right); case Audit_le: return uid_lte(left, right); case Audit_gt: return uid_gt(left, right); case Audit_ge: return uid_gte(left, right); case Audit_bitmask: case Audit_bittest: default: BUG(); return 0; } } int audit_gid_comparator(kgid_t left, u32 op, kgid_t right) { switch (op) { case Audit_equal: return gid_eq(left, right); case Audit_not_equal: return !gid_eq(left, right); case Audit_lt: return gid_lt(left, right); case Audit_le: return gid_lte(left, right); case Audit_gt: return gid_gt(left, right); case Audit_ge: return gid_gte(left, right); case Audit_bitmask: case Audit_bittest: default: BUG(); return 0; } } |
bfcec7087 audit: set the na... |
1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 |
/** * parent_len - find the length of the parent portion of a pathname * @path: pathname of which to determine length */ int parent_len(const char *path) { int plen; const char *p; plen = strlen(path); if (plen == 0) return plen; /* disregard trailing slashes */ p = path + plen - 1; while ((*p == '/') && (p > path)) p--; /* walk backward until we find the next slash or hit beginning */ while ((*p != '/') && (p > path)) p--; /* did we find a slash? Then increment to include it in path */ if (*p == '/') p++; return p - path; } |
e3d6b07b8 audit: optimize a... |
1148 1149 1150 1151 1152 1153 1154 1155 1156 |
/** * audit_compare_dname_path - compare given dentry name with last component in * given path. Return of 0 indicates a match. * @dname: dentry name that we're comparing * @path: full pathname that we're comparing * @parentlen: length of the parent if known. Passing in AUDIT_NAME_FULL * here indicates that we must compute this value. */ int audit_compare_dname_path(const char *dname, const char *path, int parentlen) |
f368c07d7 [PATCH] audit: pa... |
1157 |
{ |
e3d6b07b8 audit: optimize a... |
1158 |
int dlen, pathlen; |
f368c07d7 [PATCH] audit: pa... |
1159 |
const char *p; |
f368c07d7 [PATCH] audit: pa... |
1160 |
dlen = strlen(dname); |
29e9a3467 audit: make audit... |
1161 1162 |
pathlen = strlen(path); if (pathlen < dlen) |
f368c07d7 [PATCH] audit: pa... |
1163 |
return 1; |
e3d6b07b8 audit: optimize a... |
1164 |
parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
29e9a3467 audit: make audit... |
1165 |
if (pathlen - parentlen != dlen) |
f368c07d7 [PATCH] audit: pa... |
1166 |
return 1; |
29e9a3467 audit: make audit... |
1167 1168 |
p = path + parentlen; |
fe7752bab [PATCH] Fix audit... |
1169 |
|
f368c07d7 [PATCH] audit: pa... |
1170 1171 |
return strncmp(p, dname, dlen); } |
fe7752bab [PATCH] Fix audit... |
1172 |
|
62062cf8a audit: allow chec... |
1173 |
static int audit_filter_user_rules(struct audit_krule *rule, int type, |
fe7752bab [PATCH] Fix audit... |
1174 1175 1176 1177 1178 |
enum audit_state *state) { int i; for (i = 0; i < rule->field_count; i++) { |
93315ed6d [PATCH] audit str... |
1179 |
struct audit_field *f = &rule->fields[i]; |
fe7752bab [PATCH] Fix audit... |
1180 |
int result = 0; |
c53fa1ed9 netlink: kill log... |
1181 |
u32 sid; |
fe7752bab [PATCH] Fix audit... |
1182 |
|
93315ed6d [PATCH] audit str... |
1183 |
switch (f->type) { |
fe7752bab [PATCH] Fix audit... |
1184 |
case AUDIT_PID: |
02276bda4 audit: Use curren... |
1185 |
result = audit_comparator(task_pid_vnr(current), f->op, f->val); |
fe7752bab [PATCH] Fix audit... |
1186 1187 |
break; case AUDIT_UID: |
ca57ec0f0 audit: Add typesp... |
1188 |
result = audit_uid_comparator(current_uid(), f->op, f->uid); |
fe7752bab [PATCH] Fix audit... |
1189 1190 |
break; case AUDIT_GID: |
ca57ec0f0 audit: Add typesp... |
1191 |
result = audit_gid_comparator(current_gid(), f->op, f->gid); |
fe7752bab [PATCH] Fix audit... |
1192 1193 |
break; case AUDIT_LOGINUID: |
ca57ec0f0 audit: Add typesp... |
1194 1195 |
result = audit_uid_comparator(audit_get_loginuid(current), f->op, f->uid); |
fe7752bab [PATCH] Fix audit... |
1196 |
break; |
780a7654c audit: Make testi... |
1197 1198 1199 1200 |
case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(current), f->op, f->val); break; |
62062cf8a audit: allow chec... |
1201 1202 1203 |
case AUDIT_MSGTYPE: result = audit_comparator(type, f->op, f->val); break; |
d29be158a Audit: add suppor... |
1204 1205 1206 1207 1208 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
c53fa1ed9 netlink: kill log... |
1209 1210 1211 |
if (f->lsm_rule) { security_task_getsecid(current, &sid); result = security_audit_rule_match(sid, |
d29be158a Audit: add suppor... |
1212 1213 1214 1215 |
f->type, f->op, f->lsm_rule, NULL); |
c53fa1ed9 netlink: kill log... |
1216 |
} |
d29be158a Audit: add suppor... |
1217 |
break; |
fe7752bab [PATCH] Fix audit... |
1218 1219 1220 1221 1222 1223 1224 |
} if (!result) return 0; } switch (rule->action) { case AUDIT_NEVER: *state = AUDIT_DISABLED; break; |
fe7752bab [PATCH] Fix audit... |
1225 1226 1227 1228 |
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; } return 1; } |
62062cf8a audit: allow chec... |
1229 |
int audit_filter_user(int type) |
fe7752bab [PATCH] Fix audit... |
1230 |
{ |
11f57cedc [PATCH] audit: fi... |
1231 |
enum audit_state state = AUDIT_DISABLED; |
fe7752bab [PATCH] Fix audit... |
1232 |
struct audit_entry *e; |
fe7752bab [PATCH] Fix audit... |
1233 1234 1235 1236 |
int ret = 1; rcu_read_lock(); list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { |
62062cf8a audit: allow chec... |
1237 |
if (audit_filter_user_rules(&e->rule, type, &state)) { |
fe7752bab [PATCH] Fix audit... |
1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 |
if (state == AUDIT_DISABLED) ret = 0; break; } } rcu_read_unlock(); return ret; /* Audit by default */ } int audit_filter_type(int type) { struct audit_entry *e; int result = 0; |
9ce34218a whitespace fixes:... |
1252 |
|
fe7752bab [PATCH] Fix audit... |
1253 1254 1255 1256 1257 1258 |
rcu_read_lock(); if (list_empty(&audit_filter_list[AUDIT_FILTER_TYPE])) goto unlock_and_return; list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_TYPE], list) { |
fe7752bab [PATCH] Fix audit... |
1259 |
int i; |
93315ed6d [PATCH] audit str... |
1260 1261 1262 1263 |
for (i = 0; i < e->rule.field_count; i++) { struct audit_field *f = &e->rule.fields[i]; if (f->type == AUDIT_MSGTYPE) { result = audit_comparator(type, f->op, f->val); |
fe7752bab [PATCH] Fix audit... |
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 |
if (!result) break; } } if (result) goto unlock_and_return; } unlock_and_return: rcu_read_unlock(); return result; } |
3dc7e3153 [PATCH] support f... |
1275 |
|
e45aa212e audit rules order... |
1276 |
static int update_lsm_rule(struct audit_krule *r) |
1a9d0797b audit_update_lsm_... |
1277 |
{ |
e45aa212e audit rules order... |
1278 |
struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
1a9d0797b audit_update_lsm_... |
1279 |
struct audit_entry *nentry; |
1a9d0797b audit_update_lsm_... |
1280 |
int err = 0; |
e45aa212e audit rules order... |
1281 |
if (!security_audit_rule_known(r)) |
1a9d0797b audit_update_lsm_... |
1282 |
return 0; |
ae7b8f410 Audit: clean up t... |
1283 |
nentry = audit_dupe_rule(r); |
1a9d0797b audit_update_lsm_... |
1284 1285 1286 1287 1288 |
if (IS_ERR(nentry)) { /* save the first error encountered for the * return value */ err = PTR_ERR(nentry); audit_panic("error updating LSM filters"); |
ae7b8f410 Audit: clean up t... |
1289 |
if (r->watch) |
e45aa212e audit rules order... |
1290 |
list_del(&r->rlist); |
1a9d0797b audit_update_lsm_... |
1291 |
list_del_rcu(&entry->list); |
e45aa212e audit rules order... |
1292 |
list_del(&r->list); |
1a9d0797b audit_update_lsm_... |
1293 |
} else { |
ae7b8f410 Audit: clean up t... |
1294 |
if (r->watch || r->tree) |
e45aa212e audit rules order... |
1295 |
list_replace_init(&r->rlist, &nentry->rule.rlist); |
1a9d0797b audit_update_lsm_... |
1296 |
list_replace_rcu(&entry->list, &nentry->list); |
e45aa212e audit rules order... |
1297 |
list_replace(&r->list, &nentry->rule.list); |
1a9d0797b audit_update_lsm_... |
1298 1299 1300 1301 1302 |
} call_rcu(&entry->rcu, audit_free_rule_rcu); return err; } |
04305e4af Audit: Final rena... |
1303 |
/* This function will re-initialize the lsm_rule field of all applicable rules. |
d7a96f3a1 Audit: internally... |
1304 |
* It will traverse the filter lists serarching for rules that contain LSM |
3dc7e3153 [PATCH] support f... |
1305 |
* specific filter fields. When such a rule is found, it is copied, the |
d7a96f3a1 Audit: internally... |
1306 |
* LSM field is re-initialized, and the old rule is replaced with the |
3dc7e3153 [PATCH] support f... |
1307 |
* updated rule. */ |
d7a96f3a1 Audit: internally... |
1308 |
int audit_update_lsm_rules(void) |
3dc7e3153 [PATCH] support f... |
1309 |
{ |
e45aa212e audit rules order... |
1310 |
struct audit_krule *r, *n; |
3dc7e3153 [PATCH] support f... |
1311 |
int i, err = 0; |
f368c07d7 [PATCH] audit: pa... |
1312 1313 |
/* audit_filter_mutex synchronizes the writers */ mutex_lock(&audit_filter_mutex); |
3dc7e3153 [PATCH] support f... |
1314 1315 |
for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
e45aa212e audit rules order... |
1316 1317 |
list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { int res = update_lsm_rule(r); |
1a9d0797b audit_update_lsm_... |
1318 1319 |
if (!err) err = res; |
3dc7e3153 [PATCH] support f... |
1320 1321 |
} } |
f368c07d7 [PATCH] audit: pa... |
1322 |
mutex_unlock(&audit_filter_mutex); |
3dc7e3153 [PATCH] support f... |
1323 1324 1325 |
return err; } |