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kernel/auditfilter.c
34.1 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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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 |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#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 <net/net_namespace.h> |
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#include <net/sock.h> |
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#include "audit.h" |
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/* * Locking model: * * audit_filter_mutex: |
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* 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 * LSM rules during filtering. If modified, these structures * 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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*/ |
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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]), |
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LIST_HEAD_INIT(audit_filter_list[6]), #if AUDIT_NR_FILTERS != 7 |
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#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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LIST_HEAD_INIT(audit_rules_list[6]), |
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}; |
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|
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DEFINE_MUTEX(audit_filter_mutex); |
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|
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static void audit_free_lsm_field(struct audit_field *f) { switch (f->type) { 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: kfree(f->lsm_str); security_audit_rule_free(f->lsm_rule); } } |
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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) |
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for (i = 0; i < erule->field_count; i++) audit_free_lsm_field(&erule->fields[i]); |
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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; |
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fields = kcalloc(field_count, sizeof(*fields), GFP_KERNEL); |
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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 representation. */ |
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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->inode_f || krule->watch || krule->tree || |
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(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) { |
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__u32 *p = kcalloc(AUDIT_BITMASK_SIZE, sizeof(__u32), GFP_KERNEL); |
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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. */ |
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static inline struct audit_entry *audit_to_entry_common(struct audit_rule_data *rule) |
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{ 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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pr_err("AUDIT_FILTER_ENTRY is deprecated "); goto exit_err; |
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case AUDIT_FILTER_EXIT: case AUDIT_FILTER_TASK: #endif |
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case AUDIT_FILTER_USER: |
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case AUDIT_FILTER_EXCLUDE: |
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case AUDIT_FILTER_FS: |
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; } |
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if (unlikely(rule->action == AUDIT_POSSIBLE)) { |
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pr_err("AUDIT_POSSIBLE is deprecated "); |
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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) { |
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case AUDIT_MSGTYPE: |
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if (entry->rule.listnr != AUDIT_FILTER_EXCLUDE && |
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entry->rule.listnr != AUDIT_FILTER_USER) return -EINVAL; break; |
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case AUDIT_FSTYPE: if (entry->rule.listnr != AUDIT_FILTER_FS) return -EINVAL; break; } |
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switch (entry->rule.listnr) { |
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case AUDIT_FILTER_FS: switch(f->type) { case AUDIT_FSTYPE: case AUDIT_FILTERKEY: break; default: return -EINVAL; } |
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} |
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|
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/* Check for valid field type and op */ switch (f->type) { case AUDIT_ARG0: case AUDIT_ARG1: case AUDIT_ARG2: case AUDIT_ARG3: case AUDIT_PERS: /* <uapi/linux/personality.h> */ case AUDIT_DEVMINOR: /* all ops are valid */ break; |
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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: |
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case AUDIT_MSGTYPE: case AUDIT_PPID: case AUDIT_DEVMAJOR: |
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case AUDIT_EXIT: case AUDIT_SUCCESS: |
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case AUDIT_INODE: |
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case AUDIT_SESSIONID: |
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case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
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case AUDIT_SADDR_FAM: |
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/* bit ops are only useful on syscall args */ if (f->op == Audit_bitmask || f->op == Audit_bittest) return -EINVAL; break; |
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case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: |
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case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: |
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case AUDIT_WATCH: case AUDIT_DIR: case AUDIT_FILTERKEY: |
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case AUDIT_LOGINUID_SET: |
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case AUDIT_ARCH: |
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case AUDIT_FSTYPE: |
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case AUDIT_PERM: case AUDIT_FILETYPE: case AUDIT_FIELD_COMPARE: case AUDIT_EXE: /* only equal and not equal valid ops */ |
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if (f->op != Audit_not_equal && f->op != Audit_equal) return -EINVAL; break; |
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default: /* field not recognized */ return -EINVAL; } /* Check for select valid field values */ switch (f->type) { case AUDIT_LOGINUID_SET: if ((f->val != 0) && (f->val != 1)) return -EINVAL; break; |
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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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case AUDIT_SADDR_FAM: if (f->val >= AF_MAX) |
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return -EINVAL; |
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break; |
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default: |
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break; |
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} |
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|
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return 0; |
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} |
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/* Translate struct audit_rule_data to kernel's rule representation. */ |
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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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struct audit_fsnotify_mark *audit_mark; |
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|
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entry = audit_to_entry_common(data); |
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if (IS_ERR(entry)) goto exit_nofree; |
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|
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bufp = data->buf; |
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for (i = 0; i < data->field_count; i++) { struct audit_field *f = &entry->rule.fields[i]; |
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u32 f_val; |
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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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|
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/* Support legacy tests for a valid loginuid */ |
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if ((f->type == AUDIT_LOGINUID) && (f_val == AUDIT_UID_UNSET)) { |
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f->type = AUDIT_LOGINUID_SET; |
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f_val = 0; |
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entry->rule.pflags |= AUDIT_LOGINUID_LEGACY; |
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} |
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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); |
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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); |
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if (!gid_valid(f->gid)) goto exit_free; break; |
e54dc2431 [PATCH] audit sig... |
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case AUDIT_ARCH: |
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f->val = f_val; |
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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)) { err = PTR_ERR(str); |
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500 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
501 502 503 |
} entry->rule.buflen += f_val; f->lsm_str = str; |
d7a96f3a1 Audit: internally... |
504 |
err = security_audit_rule_init(f->type, f->op, str, |
04305e4af Audit: Final rena... |
505 |
(void **)&f->lsm_rule); |
3dc7e3153 [PATCH] support f... |
506 507 508 |
/* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (err == -EINVAL) { |
f952d10ff audit: Use more c... |
509 510 511 |
pr_warn("audit rule for LSM \'%s\' is invalid ", str); |
3dc7e3153 [PATCH] support f... |
512 |
err = 0; |
2ad3e17eb audit: fix error ... |
513 |
} else if (err) |
3dc7e3153 [PATCH] support f... |
514 |
goto exit_free; |
3dc7e3153 [PATCH] support f... |
515 |
break; |
f368c07d7 [PATCH] audit: pa... |
516 |
case AUDIT_WATCH: |
2ad3e17eb audit: fix error ... |
517 518 519 |
str = audit_unpack_string(&bufp, &remain, f_val); if (IS_ERR(str)) { err = PTR_ERR(str); |
f368c07d7 [PATCH] audit: pa... |
520 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
521 522 |
} err = audit_to_watch(&entry->rule, str, f_val, f->op); |
f368c07d7 [PATCH] audit: pa... |
523 524 525 526 |
if (err) { kfree(str); goto exit_free; } |
2ad3e17eb audit: fix error ... |
527 |
entry->rule.buflen += f_val; |
f368c07d7 [PATCH] audit: pa... |
528 |
break; |
74c3cbe33 [PATCH] audit: wa... |
529 |
case AUDIT_DIR: |
2ad3e17eb audit: fix error ... |
530 531 532 |
str = audit_unpack_string(&bufp, &remain, f_val); if (IS_ERR(str)) { err = PTR_ERR(str); |
74c3cbe33 [PATCH] audit: wa... |
533 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
534 |
} |
74c3cbe33 [PATCH] audit: wa... |
535 536 537 538 |
err = audit_make_tree(&entry->rule, str, f->op); kfree(str); if (err) goto exit_free; |
2ad3e17eb audit: fix error ... |
539 |
entry->rule.buflen += f_val; |
74c3cbe33 [PATCH] audit: wa... |
540 |
break; |
f368c07d7 [PATCH] audit: pa... |
541 |
case AUDIT_INODE: |
2ad3e17eb audit: fix error ... |
542 |
f->val = f_val; |
f368c07d7 [PATCH] audit: pa... |
543 544 545 546 |
err = audit_to_inode(&entry->rule, f); if (err) goto exit_free; break; |
5adc8a6ad [PATCH] add rule ... |
547 |
case AUDIT_FILTERKEY: |
2ad3e17eb audit: fix error ... |
548 |
if (entry->rule.filterkey || f_val > AUDIT_MAX_KEY_LEN) |
5adc8a6ad [PATCH] add rule ... |
549 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
550 551 552 |
str = audit_unpack_string(&bufp, &remain, f_val); if (IS_ERR(str)) { err = PTR_ERR(str); |
5adc8a6ad [PATCH] add rule ... |
553 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
554 555 |
} entry->rule.buflen += f_val; |
5adc8a6ad [PATCH] add rule ... |
556 557 |
entry->rule.filterkey = str; break; |
34d99af52 audit: implement ... |
558 |
case AUDIT_EXE: |
2ad3e17eb audit: fix error ... |
559 |
if (entry->rule.exe || f_val > PATH_MAX) |
34d99af52 audit: implement ... |
560 |
goto exit_free; |
2ad3e17eb audit: fix error ... |
561 |
str = audit_unpack_string(&bufp, &remain, f_val); |
34d99af52 audit: implement ... |
562 563 564 565 |
if (IS_ERR(str)) { err = PTR_ERR(str); goto exit_free; } |
2ad3e17eb audit: fix error ... |
566 |
audit_mark = audit_alloc_mark(&entry->rule, str, f_val); |
34d99af52 audit: implement ... |
567 568 569 570 571 |
if (IS_ERR(audit_mark)) { kfree(str); err = PTR_ERR(audit_mark); goto exit_free; } |
2ad3e17eb audit: fix error ... |
572 |
entry->rule.buflen += f_val; |
34d99af52 audit: implement ... |
573 574 |
entry->rule.exe = audit_mark; break; |
2ad3e17eb audit: fix error ... |
575 576 577 |
default: f->val = f_val; break; |
f368c07d7 [PATCH] audit: pa... |
578 579 |
} } |
5af75d8d5 audit: validate c... |
580 581 |
if (entry->rule.inode_f && entry->rule.inode_f->op == Audit_not_equal) entry->rule.inode_f = NULL; |
93315ed6d [PATCH] audit str... |
582 583 584 585 586 |
exit_nofree: return entry; exit_free: |
373e0f340 kernel/auditfilte... |
587 588 |
if (entry->rule.tree) audit_put_tree(entry->rule.tree); /* that's the temporary one */ |
34d99af52 audit: implement ... |
589 590 |
if (entry->rule.exe) audit_remove_mark(entry->rule.exe); /* that's the template one */ |
93315ed6d [PATCH] audit str... |
591 592 593 594 595 |
audit_free_rule(entry); return ERR_PTR(err); } /* Pack a filter field's string representation into data block. */ |
74c3cbe33 [PATCH] audit: wa... |
596 |
static inline size_t audit_pack_string(void **bufp, const char *str) |
93315ed6d [PATCH] audit str... |
597 598 599 600 601 602 603 604 |
{ size_t len = strlen(str); memcpy(*bufp, str, len); *bufp += len; return len; } |
fd97646b0 audit: Fix typo i... |
605 |
/* Translate kernel rule representation to struct audit_rule_data. */ |
93315ed6d [PATCH] audit str... |
606 607 608 609 610 611 612 613 |
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)) |
0a3b483e8 [PATCH] fix audit... |
614 |
return NULL; |
93315ed6d [PATCH] audit str... |
615 616 617 618 619 620 621 622 623 624 |
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; |
5af75d8d5 audit: validate c... |
625 |
data->fieldflags[i] = audit_ops[f->op]; |
93315ed6d [PATCH] audit str... |
626 |
switch(f->type) { |
3a6b9f85c [PATCH] audit: re... |
627 628 629 630 631 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3 [PATCH] audit: su... |
632 633 634 635 636 |
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... |
637 |
data->buflen += data->values[i] = |
04305e4af Audit: Final rena... |
638 |
audit_pack_string(&bufp, f->lsm_str); |
3dc7e3153 [PATCH] support f... |
639 |
break; |
f368c07d7 [PATCH] audit: pa... |
640 641 |
case AUDIT_WATCH: data->buflen += data->values[i] = |
cfcad62c7 audit: seperate a... |
642 643 |
audit_pack_string(&bufp, audit_watch_path(krule->watch)); |
f368c07d7 [PATCH] audit: pa... |
644 |
break; |
74c3cbe33 [PATCH] audit: wa... |
645 646 647 648 649 |
case AUDIT_DIR: data->buflen += data->values[i] = audit_pack_string(&bufp, audit_tree_path(krule->tree)); break; |
5adc8a6ad [PATCH] add rule ... |
650 651 652 653 |
case AUDIT_FILTERKEY: data->buflen += data->values[i] = audit_pack_string(&bufp, krule->filterkey); break; |
34d99af52 audit: implement ... |
654 655 656 657 |
case AUDIT_EXE: data->buflen += data->values[i] = audit_pack_string(&bufp, audit_mark_path(krule->exe)); break; |
041d7b98f audit: restore AU... |
658 659 660 661 662 663 |
case AUDIT_LOGINUID_SET: if (krule->pflags & AUDIT_LOGINUID_LEGACY && !f->val) { data->fields[i] = AUDIT_LOGINUID; data->values[i] = AUDIT_UID_UNSET; break; } |
df561f668 treewide: Use fal... |
664 |
fallthrough; /* if set */ |
93315ed6d [PATCH] audit str... |
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 |
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 || |
041d7b98f audit: restore AU... |
681 |
a->pflags != b->pflags || |
93315ed6d [PATCH] audit str... |
682 683 684 |
a->listnr != b->listnr || a->action != b->action || a->field_count != b->field_count) |
fe7752bab [PATCH] Fix audit... |
685 686 687 |
return 1; for (i = 0; i < a->field_count; i++) { |
93315ed6d [PATCH] audit str... |
688 689 |
if (a->fields[i].type != b->fields[i].type || a->fields[i].op != b->fields[i].op) |
fe7752bab [PATCH] Fix audit... |
690 |
return 1; |
93315ed6d [PATCH] audit str... |
691 692 |
switch(a->fields[i].type) { |
3a6b9f85c [PATCH] audit: re... |
693 694 695 696 697 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3 [PATCH] audit: su... |
698 699 700 701 702 |
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... |
703 |
if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
3dc7e3153 [PATCH] support f... |
704 705 |
return 1; break; |
f368c07d7 [PATCH] audit: pa... |
706 |
case AUDIT_WATCH: |
cfcad62c7 audit: seperate a... |
707 708 |
if (strcmp(audit_watch_path(a->watch), audit_watch_path(b->watch))) |
f368c07d7 [PATCH] audit: pa... |
709 710 |
return 1; break; |
74c3cbe33 [PATCH] audit: wa... |
711 712 713 714 715 |
case AUDIT_DIR: if (strcmp(audit_tree_path(a->tree), audit_tree_path(b->tree))) return 1; break; |
5adc8a6ad [PATCH] add rule ... |
716 717 718 719 720 |
case AUDIT_FILTERKEY: /* both filterkeys exist based on above type compare */ if (strcmp(a->filterkey, b->filterkey)) return 1; break; |
34d99af52 audit: implement ... |
721 722 723 724 725 726 |
case AUDIT_EXE: /* both paths exist based on above type compare */ if (strcmp(audit_mark_path(a->exe), audit_mark_path(b->exe))) return 1; break; |
ca57ec0f0 audit: Add typesp... |
727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 |
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... |
744 745 746 747 |
default: if (a->fields[i].val != b->fields[i].val) return 1; } |
fe7752bab [PATCH] Fix audit... |
748 749 750 751 752 753 754 755 |
} for (i = 0; i < AUDIT_BITMASK_SIZE; i++) if (a->mask[i] != b->mask[i]) return 1; return 0; } |
04305e4af Audit: Final rena... |
756 |
/* Duplicate LSM field information. The lsm_rule is opaque, so must be |
3dc7e3153 [PATCH] support f... |
757 |
* re-initialized. */ |
d7a96f3a1 Audit: internally... |
758 |
static inline int audit_dupe_lsm_field(struct audit_field *df, |
3dc7e3153 [PATCH] support f... |
759 760 761 |
struct audit_field *sf) { int ret = 0; |
04305e4af Audit: Final rena... |
762 |
char *lsm_str; |
3dc7e3153 [PATCH] support f... |
763 |
|
04305e4af Audit: Final rena... |
764 765 766 |
/* our own copy of lsm_str */ lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); if (unlikely(!lsm_str)) |
3e1fbd12c [PATCH] audit: fi... |
767 |
return -ENOMEM; |
04305e4af Audit: Final rena... |
768 |
df->lsm_str = lsm_str; |
3dc7e3153 [PATCH] support f... |
769 |
|
04305e4af Audit: Final rena... |
770 771 772 |
/* 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... |
773 774 775 |
/* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (ret == -EINVAL) { |
f952d10ff audit: Use more c... |
776 777 778 |
pr_warn("audit rule for LSM \'%s\' is invalid ", df->lsm_str); |
3dc7e3153 [PATCH] support f... |
779 780 781 782 783 784 785 |
ret = 0; } return ret; } /* Duplicate an audit rule. This will be a deep copy with the exception |
d7a96f3a1 Audit: internally... |
786 |
* of the watch - that pointer is carried over. The LSM specific fields |
3dc7e3153 [PATCH] support f... |
787 |
* will be updated in the copy. The point is to be able to replace the old |
f368c07d7 [PATCH] audit: pa... |
788 789 790 |
* 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... |
791 |
struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
3dc7e3153 [PATCH] support f... |
792 793 794 795 |
{ u32 fcount = old->field_count; struct audit_entry *entry; struct audit_krule *new; |
5adc8a6ad [PATCH] add rule ... |
796 |
char *fk; |
3dc7e3153 [PATCH] support f... |
797 798 799 800 801 802 803 |
int i, err = 0; entry = audit_init_entry(fcount); if (unlikely(!entry)) return ERR_PTR(-ENOMEM); new = &entry->rule; |
3dc7e3153 [PATCH] support f... |
804 |
new->flags = old->flags; |
041d7b98f audit: restore AU... |
805 |
new->pflags = old->pflags; |
3dc7e3153 [PATCH] support f... |
806 807 808 809 |
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... |
810 |
new->prio = old->prio; |
3dc7e3153 [PATCH] support f... |
811 |
new->buflen = old->buflen; |
f368c07d7 [PATCH] audit: pa... |
812 |
new->inode_f = old->inode_f; |
3dc7e3153 [PATCH] support f... |
813 |
new->field_count = old->field_count; |
ae7b8f410 Audit: clean up t... |
814 |
|
74c3cbe33 [PATCH] audit: wa... |
815 816 817 818 819 820 821 822 |
/* * 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... |
823 |
memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
04305e4af Audit: Final rena... |
824 |
/* deep copy this information, updating the lsm_rule fields, because |
3dc7e3153 [PATCH] support f... |
825 826 827 |
* 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... |
828 829 830 831 832 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3 [PATCH] audit: su... |
833 834 835 836 837 |
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... |
838 |
err = audit_dupe_lsm_field(&new->fields[i], |
3dc7e3153 [PATCH] support f... |
839 |
&old->fields[i]); |
5adc8a6ad [PATCH] add rule ... |
840 841 842 843 844 845 846 |
break; case AUDIT_FILTERKEY: fk = kstrdup(old->filterkey, GFP_KERNEL); if (unlikely(!fk)) err = -ENOMEM; else new->filterkey = fk; |
34d99af52 audit: implement ... |
847 848 849 850 |
break; case AUDIT_EXE: err = audit_dupe_exe(new, old); break; |
3dc7e3153 [PATCH] support f... |
851 852 |
} if (err) { |
34d99af52 audit: implement ... |
853 854 |
if (new->exe) audit_remove_mark(new->exe); |
3dc7e3153 [PATCH] support f... |
855 856 857 858 |
audit_free_rule(entry); return ERR_PTR(err); } } |
ae7b8f410 Audit: clean up t... |
859 860 861 |
if (old->watch) { audit_get_watch(old->watch); new->watch = old->watch; |
f368c07d7 [PATCH] audit: pa... |
862 |
} |
3dc7e3153 [PATCH] support f... |
863 864 |
return entry; } |
f368c07d7 [PATCH] audit: pa... |
865 866 867 |
/* 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... |
868 |
struct list_head **p) |
f368c07d7 [PATCH] audit: pa... |
869 870 |
{ struct audit_entry *e, *found = NULL; |
36c4f1b18 clean up audit_ru... |
871 |
struct list_head *list; |
f368c07d7 [PATCH] audit: pa... |
872 |
int h; |
36c4f1b18 clean up audit_ru... |
873 874 875 876 |
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... |
877 878 879 880 881 882 883 884 885 886 |
/* 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... |
887 888 |
} else { *p = list = &audit_filter_list[entry->rule.listnr]; |
f368c07d7 [PATCH] audit: pa... |
889 890 891 892 893 894 895 896 897 898 899 |
} 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... |
900 901 |
static u64 prio_low = ~0ULL/2; static u64 prio_high = ~0ULL/2 - 1; |
f368c07d7 [PATCH] audit: pa... |
902 |
/* Add rule to given filterlist if not a duplicate. */ |
36c4f1b18 clean up audit_ru... |
903 |
static inline int audit_add_rule(struct audit_entry *entry) |
fe7752bab [PATCH] Fix audit... |
904 |
{ |
93315ed6d [PATCH] audit str... |
905 |
struct audit_entry *e; |
f368c07d7 [PATCH] audit: pa... |
906 |
struct audit_watch *watch = entry->rule.watch; |
74c3cbe33 [PATCH] audit: wa... |
907 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18 clean up audit_ru... |
908 |
struct list_head *list; |
ae9d2fb48 audit: fix uninit... |
909 |
int err = 0; |
471a5c7c8 [PATCH] introduce... |
910 911 |
#ifdef CONFIG_AUDITSYSCALL int dont_count = 0; |
42d5e3765 audit: filter PAT... |
912 913 914 |
/* If any of these, don't count towards total */ switch(entry->rule.listnr) { case AUDIT_FILTER_USER: |
d904ac032 audit: rename FIL... |
915 |
case AUDIT_FILTER_EXCLUDE: |
42d5e3765 audit: filter PAT... |
916 |
case AUDIT_FILTER_FS: |
471a5c7c8 [PATCH] introduce... |
917 |
dont_count = 1; |
42d5e3765 audit: filter PAT... |
918 |
} |
471a5c7c8 [PATCH] introduce... |
919 |
#endif |
f368c07d7 [PATCH] audit: pa... |
920 |
|
f368c07d7 [PATCH] audit: pa... |
921 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18 clean up audit_ru... |
922 |
e = audit_find_rule(entry, &list); |
f368c07d7 [PATCH] audit: pa... |
923 |
if (e) { |
35fe4d0b1 Audit: move audit... |
924 |
mutex_unlock(&audit_filter_mutex); |
f368c07d7 [PATCH] audit: pa... |
925 |
err = -EEXIST; |
74c3cbe33 [PATCH] audit: wa... |
926 927 928 |
/* normally audit_add_tree_rule() will free it on failure */ if (tree) audit_put_tree(tree); |
f8259b262 audit: eliminate ... |
929 |
return err; |
f368c07d7 [PATCH] audit: pa... |
930 |
} |
fe7752bab [PATCH] Fix audit... |
931 |
|
f368c07d7 [PATCH] audit: pa... |
932 933 |
if (watch) { /* audit_filter_mutex is dropped and re-taken during this call */ |
ae7b8f410 Audit: clean up t... |
934 |
err = audit_add_watch(&entry->rule, &list); |
f368c07d7 [PATCH] audit: pa... |
935 936 |
if (err) { mutex_unlock(&audit_filter_mutex); |
2f992ee85 kernel/auditfilte... |
937 938 939 940 941 942 |
/* * normally audit_add_tree_rule() will free it * on failure */ if (tree) audit_put_tree(tree); |
f8259b262 audit: eliminate ... |
943 |
return err; |
f368c07d7 [PATCH] audit: pa... |
944 |
} |
fe7752bab [PATCH] Fix audit... |
945 |
} |
74c3cbe33 [PATCH] audit: wa... |
946 947 948 949 |
if (tree) { err = audit_add_tree_rule(&entry->rule); if (err) { mutex_unlock(&audit_filter_mutex); |
f8259b262 audit: eliminate ... |
950 |
return err; |
74c3cbe33 [PATCH] audit: wa... |
951 952 |
} } |
fe7752bab [PATCH] Fix audit... |
953 |
|
0590b9335 fixing audit rule... |
954 955 956 957 958 959 960 |
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... |
961 |
if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
e45aa212e audit rules order... |
962 963 |
list_add(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab [PATCH] Fix audit... |
964 |
list_add_rcu(&entry->list, list); |
6a2bceec0 [PATCH] fix AUDIT... |
965 |
entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
fe7752bab [PATCH] Fix audit... |
966 |
} else { |
e45aa212e audit rules order... |
967 968 |
list_add_tail(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab [PATCH] Fix audit... |
969 970 |
list_add_tail_rcu(&entry->list, list); } |
471a5c7c8 [PATCH] introduce... |
971 972 973 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules++; |
e54dc2431 [PATCH] audit sig... |
974 975 976 |
if (!audit_match_signal(entry)) audit_signals++; |
471a5c7c8 [PATCH] introduce... |
977 |
#endif |
f368c07d7 [PATCH] audit: pa... |
978 |
mutex_unlock(&audit_filter_mutex); |
fe7752bab [PATCH] Fix audit... |
979 |
|
f368c07d7 [PATCH] audit: pa... |
980 |
return err; |
fe7752bab [PATCH] Fix audit... |
981 |
} |
f368c07d7 [PATCH] audit: pa... |
982 |
/* Remove an existing rule from filterlist. */ |
7f4929428 audit: clean simp... |
983 |
int audit_del_rule(struct audit_entry *entry) |
fe7752bab [PATCH] Fix audit... |
984 985 |
{ struct audit_entry *e; |
74c3cbe33 [PATCH] audit: wa... |
986 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18 clean up audit_ru... |
987 |
struct list_head *list; |
36c4f1b18 clean up audit_ru... |
988 |
int ret = 0; |
471a5c7c8 [PATCH] introduce... |
989 990 |
#ifdef CONFIG_AUDITSYSCALL int dont_count = 0; |
42d5e3765 audit: filter PAT... |
991 992 993 |
/* If any of these, don't count towards total */ switch(entry->rule.listnr) { case AUDIT_FILTER_USER: |
d904ac032 audit: rename FIL... |
994 |
case AUDIT_FILTER_EXCLUDE: |
42d5e3765 audit: filter PAT... |
995 |
case AUDIT_FILTER_FS: |
471a5c7c8 [PATCH] introduce... |
996 |
dont_count = 1; |
42d5e3765 audit: filter PAT... |
997 |
} |
471a5c7c8 [PATCH] introduce... |
998 |
#endif |
f368c07d7 [PATCH] audit: pa... |
999 |
|
f368c07d7 [PATCH] audit: pa... |
1000 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18 clean up audit_ru... |
1001 |
e = audit_find_rule(entry, &list); |
f368c07d7 [PATCH] audit: pa... |
1002 |
if (!e) { |
f368c07d7 [PATCH] audit: pa... |
1003 1004 1005 |
ret = -ENOENT; goto out; } |
cfcad62c7 audit: seperate a... |
1006 |
if (e->rule.watch) |
a05fb6cc5 audit: do not get... |
1007 |
audit_remove_watch_rule(&e->rule); |
f368c07d7 [PATCH] audit: pa... |
1008 |
|
74c3cbe33 [PATCH] audit: wa... |
1009 1010 |
if (e->rule.tree) audit_remove_tree_rule(&e->rule); |
34d99af52 audit: implement ... |
1011 1012 |
if (e->rule.exe) audit_remove_mark_rule(&e->rule); |
471a5c7c8 [PATCH] introduce... |
1013 1014 1015 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules--; |
e54dc2431 [PATCH] audit sig... |
1016 1017 1018 |
if (!audit_match_signal(entry)) audit_signals--; |
471a5c7c8 [PATCH] introduce... |
1019 |
#endif |
8c85fc9ae audit: make audit... |
1020 1021 1022 1023 |
list_del_rcu(&e->list); list_del(&e->rule.list); call_rcu(&e->rcu, audit_free_rule_rcu); |
f368c07d7 [PATCH] audit: pa... |
1024 |
|
f368c07d7 [PATCH] audit: pa... |
1025 |
out: |
8c85fc9ae audit: make audit... |
1026 |
mutex_unlock(&audit_filter_mutex); |
74c3cbe33 [PATCH] audit: wa... |
1027 1028 |
if (tree) audit_put_tree(tree); /* that's the temporary one */ |
f368c07d7 [PATCH] audit: pa... |
1029 1030 |
return ret; |
fe7752bab [PATCH] Fix audit... |
1031 |
} |
93315ed6d [PATCH] audit str... |
1032 |
/* List rules using struct audit_rule_data. */ |
45a0642b4 audit: kernel gen... |
1033 |
static void audit_list_rules(int seq, struct sk_buff_head *q) |
93315ed6d [PATCH] audit str... |
1034 |
{ |
9044e6bca [PATCH] fix deadl... |
1035 |
struct sk_buff *skb; |
e45aa212e audit rules order... |
1036 |
struct audit_krule *r; |
93315ed6d [PATCH] audit str... |
1037 |
int i; |
f368c07d7 [PATCH] audit: pa... |
1038 1039 |
/* This is a blocking read, so use audit_filter_mutex instead of rcu * iterator to sync with list writers. */ |
93315ed6d [PATCH] audit str... |
1040 |
for (i=0; i<AUDIT_NR_FILTERS; i++) { |
e45aa212e audit rules order... |
1041 |
list_for_each_entry(r, &audit_rules_list[i], list) { |
f368c07d7 [PATCH] audit: pa... |
1042 |
struct audit_rule_data *data; |
e45aa212e audit rules order... |
1043 |
data = audit_krule_to_data(r); |
f368c07d7 [PATCH] audit: pa... |
1044 1045 |
if (unlikely(!data)) break; |
45a0642b4 audit: kernel gen... |
1046 1047 |
skb = audit_make_reply(seq, AUDIT_LIST_RULES, 0, 1, data, |
f9441639e audit: fix netlin... |
1048 |
sizeof(*data) + data->buflen); |
9044e6bca [PATCH] fix deadl... |
1049 1050 |
if (skb) skb_queue_tail(q, skb); |
93315ed6d [PATCH] audit str... |
1051 1052 1053 |
kfree(data); } } |
45a0642b4 audit: kernel gen... |
1054 |
skb = audit_make_reply(seq, AUDIT_LIST_RULES, 1, 1, NULL, 0); |
9044e6bca [PATCH] fix deadl... |
1055 1056 |
if (skb) skb_queue_tail(q, skb); |
93315ed6d [PATCH] audit str... |
1057 |
} |
5adc8a6ad [PATCH] add rule ... |
1058 |
/* Log rule additions and removals */ |
dc9eb698f audit: stop pushi... |
1059 |
static void audit_log_rule_change(char *action, struct audit_krule *rule, int res) |
5adc8a6ad [PATCH] add rule ... |
1060 1061 |
{ struct audit_buffer *ab; |
1a6b9f231 [AUDIT] make audi... |
1062 1063 |
if (!audit_enabled) return; |
626abcd13 audit: add syscal... |
1064 |
ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
5adc8a6ad [PATCH] add rule ... |
1065 1066 |
if (!ab) return; |
5c5b8d8be audit: use existi... |
1067 |
audit_log_session_info(ab); |
b122c3767 audit: use a cons... |
1068 |
audit_log_task_context(ab); |
c1e8f06d7 audit: fix format... |
1069 |
audit_log_format(ab, " op=%s", action); |
9d9609851 Audit: clean up a... |
1070 |
audit_log_key(ab, rule->filterkey); |
5adc8a6ad [PATCH] add rule ... |
1071 1072 1073 |
audit_log_format(ab, " list=%d res=%d", rule->listnr, res); audit_log_end(ab); } |
fe7752bab [PATCH] Fix audit... |
1074 |
/** |
ce0d9f046 audit: refactor a... |
1075 |
* audit_rule_change - apply all rules to the specified message type |
fe7752bab [PATCH] Fix audit... |
1076 |
* @type: audit message type |
fe7752bab [PATCH] Fix audit... |
1077 1078 |
* @seq: netlink audit message sequence (serial) number * @data: payload data |
93315ed6d [PATCH] audit str... |
1079 |
* @datasz: size of payload data |
fe7752bab [PATCH] Fix audit... |
1080 |
*/ |
45a0642b4 audit: kernel gen... |
1081 |
int audit_rule_change(int type, int seq, void *data, size_t datasz) |
fe7752bab [PATCH] Fix audit... |
1082 |
{ |
93315ed6d [PATCH] audit str... |
1083 1084 |
int err = 0; struct audit_entry *entry; |
fe7752bab [PATCH] Fix audit... |
1085 1086 |
switch (type) { |
93315ed6d [PATCH] audit str... |
1087 |
case AUDIT_ADD_RULE: |
70c4cf17e audit: fix a memo... |
1088 1089 1090 |
entry = audit_data_to_entry(data, datasz); if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18 clean up audit_ru... |
1091 |
err = audit_add_rule(entry); |
e7df61f4d audit: invalid op... |
1092 |
audit_log_rule_change("add_rule", &entry->rule, !err); |
fe7752bab [PATCH] Fix audit... |
1093 |
break; |
93315ed6d [PATCH] audit str... |
1094 |
case AUDIT_DEL_RULE: |
70c4cf17e audit: fix a memo... |
1095 1096 1097 |
entry = audit_data_to_entry(data, datasz); if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18 clean up audit_ru... |
1098 |
err = audit_del_rule(entry); |
e7df61f4d audit: invalid op... |
1099 |
audit_log_rule_change("remove_rule", &entry->rule, !err); |
fe7752bab [PATCH] Fix audit... |
1100 1101 |
break; default: |
739c95038 audit: WARN if au... |
1102 |
WARN_ON(1); |
70c4cf17e audit: fix a memo... |
1103 |
return -EINVAL; |
fe7752bab [PATCH] Fix audit... |
1104 |
} |
34d99af52 audit: implement ... |
1105 1106 1107 |
if (err || type == AUDIT_DEL_RULE) { if (entry->rule.exe) audit_remove_mark(entry->rule.exe); |
e85322d21 audit: cull redun... |
1108 |
audit_free_rule(entry); |
34d99af52 audit: implement ... |
1109 |
} |
e85322d21 audit: cull redun... |
1110 |
|
fe7752bab [PATCH] Fix audit... |
1111 1112 |
return err; } |
ce0d9f046 audit: refactor a... |
1113 1114 |
/** * audit_list_rules_send - list the audit rules |
d211f177b audit: Update kdo... |
1115 |
* @request_skb: skb of request we are replying to (used to target the reply) |
ce0d9f046 audit: refactor a... |
1116 1117 |
* @seq: netlink audit message sequence (serial) number */ |
6f285b19d audit: Send repli... |
1118 |
int audit_list_rules_send(struct sk_buff *request_skb, int seq) |
ce0d9f046 audit: refactor a... |
1119 1120 1121 |
{ struct task_struct *tsk; struct audit_netlink_list *dest; |
ce0d9f046 audit: refactor a... |
1122 1123 1124 1125 1126 1127 |
/* 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 */ |
3054d0671 audit: fix a net ... |
1128 |
dest = kmalloc(sizeof(*dest), GFP_KERNEL); |
ce0d9f046 audit: refactor a... |
1129 1130 |
if (!dest) return -ENOMEM; |
3054d0671 audit: fix a net ... |
1131 1132 |
dest->net = get_net(sock_net(NETLINK_CB(request_skb).sk)); dest->portid = NETLINK_CB(request_skb).portid; |
ce0d9f046 audit: refactor a... |
1133 1134 1135 |
skb_queue_head_init(&dest->q); mutex_lock(&audit_filter_mutex); |
45a0642b4 audit: kernel gen... |
1136 |
audit_list_rules(seq, &dest->q); |
ce0d9f046 audit: refactor a... |
1137 |
mutex_unlock(&audit_filter_mutex); |
3054d0671 audit: fix a net ... |
1138 |
tsk = kthread_run(audit_send_list_thread, dest, "audit_send_list"); |
ce0d9f046 audit: refactor a... |
1139 1140 |
if (IS_ERR(tsk)) { skb_queue_purge(&dest->q); |
3054d0671 audit: fix a net ... |
1141 |
put_net(dest->net); |
ce0d9f046 audit: refactor a... |
1142 |
kfree(dest); |
3054d0671 audit: fix a net ... |
1143 |
return PTR_ERR(tsk); |
ce0d9f046 audit: refactor a... |
1144 |
} |
3054d0671 audit: fix a net ... |
1145 |
return 0; |
ce0d9f046 audit: refactor a... |
1146 |
} |
5af75d8d5 audit: validate c... |
1147 |
int audit_comparator(u32 left, u32 op, u32 right) |
fe7752bab [PATCH] Fix audit... |
1148 1149 |
{ switch (op) { |
5af75d8d5 audit: validate c... |
1150 |
case Audit_equal: |
fe7752bab [PATCH] Fix audit... |
1151 |
return (left == right); |
5af75d8d5 audit: validate c... |
1152 |
case Audit_not_equal: |
fe7752bab [PATCH] Fix audit... |
1153 |
return (left != right); |
5af75d8d5 audit: validate c... |
1154 |
case Audit_lt: |
fe7752bab [PATCH] Fix audit... |
1155 |
return (left < right); |
5af75d8d5 audit: validate c... |
1156 |
case Audit_le: |
fe7752bab [PATCH] Fix audit... |
1157 |
return (left <= right); |
5af75d8d5 audit: validate c... |
1158 |
case Audit_gt: |
fe7752bab [PATCH] Fix audit... |
1159 |
return (left > right); |
5af75d8d5 audit: validate c... |
1160 |
case Audit_ge: |
fe7752bab [PATCH] Fix audit... |
1161 |
return (left >= right); |
5af75d8d5 audit: validate c... |
1162 |
case Audit_bitmask: |
74f2345b6 [PATCH] allow aud... |
1163 |
return (left & right); |
5af75d8d5 audit: validate c... |
1164 |
case Audit_bittest: |
74f2345b6 [PATCH] allow aud... |
1165 |
return ((left & right) == right); |
5af75d8d5 audit: validate c... |
1166 |
default: |
5af75d8d5 audit: validate c... |
1167 |
return 0; |
fe7752bab [PATCH] Fix audit... |
1168 1169 |
} } |
ca57ec0f0 audit: Add typesp... |
1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
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: |
ca57ec0f0 audit: Add typesp... |
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 |
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: |
ca57ec0f0 audit: Add typesp... |
1210 1211 1212 |
return 0; } } |
bfcec7087 audit: set the na... |
1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 |
/** * 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... |
1242 1243 1244 1245 1246 1247 1248 1249 |
/** * 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. */ |
795d673af audit_compare_dna... |
1250 |
int audit_compare_dname_path(const struct qstr *dname, const char *path, int parentlen) |
f368c07d7 [PATCH] audit: pa... |
1251 |
{ |
e3d6b07b8 audit: optimize a... |
1252 |
int dlen, pathlen; |
f368c07d7 [PATCH] audit: pa... |
1253 |
const char *p; |
795d673af audit_compare_dna... |
1254 |
dlen = dname->len; |
29e9a3467 audit: make audit... |
1255 1256 |
pathlen = strlen(path); if (pathlen < dlen) |
f368c07d7 [PATCH] audit: pa... |
1257 |
return 1; |
e3d6b07b8 audit: optimize a... |
1258 |
parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
29e9a3467 audit: make audit... |
1259 |
if (pathlen - parentlen != dlen) |
f368c07d7 [PATCH] audit: pa... |
1260 |
return 1; |
29e9a3467 audit: make audit... |
1261 1262 |
p = path + parentlen; |
fe7752bab [PATCH] Fix audit... |
1263 |
|
795d673af audit_compare_dna... |
1264 |
return strncmp(p, dname->name, dlen); |
f368c07d7 [PATCH] audit: pa... |
1265 |
} |
fe7752bab [PATCH] Fix audit... |
1266 |
|
86b2efbe3 audit: add fields... |
1267 |
int audit_filter(int msgtype, unsigned int listtype) |
fe7752bab [PATCH] Fix audit... |
1268 1269 |
{ struct audit_entry *e; |
86b2efbe3 audit: add fields... |
1270 |
int ret = 1; /* Audit by default */ |
9ce34218a whitespace fixes:... |
1271 |
|
fe7752bab [PATCH] Fix audit... |
1272 |
rcu_read_lock(); |
86b2efbe3 audit: add fields... |
1273 1274 |
list_for_each_entry_rcu(e, &audit_filter_list[listtype], list) { int i, result = 0; |
fe7752bab [PATCH] Fix audit... |
1275 |
|
93315ed6d [PATCH] audit str... |
1276 1277 |
for (i = 0; i < e->rule.field_count; i++) { struct audit_field *f = &e->rule.fields[i]; |
86b2efbe3 audit: add fields... |
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 |
pid_t pid; u32 sid; switch (f->type) { case AUDIT_PID: pid = task_pid_nr(current); result = audit_comparator(pid, f->op, f->val); break; case AUDIT_UID: result = audit_uid_comparator(current_uid(), f->op, f->uid); break; case AUDIT_GID: result = audit_gid_comparator(current_gid(), f->op, f->gid); break; case AUDIT_LOGINUID: result = audit_uid_comparator(audit_get_loginuid(current), f->op, f->uid); break; case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(current), f->op, f->val); break; case AUDIT_MSGTYPE: result = audit_comparator(msgtype, f->op, f->val); break; case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: if (f->lsm_rule) { security_task_getsecid(current, &sid); result = security_audit_rule_match(sid, |
90462a5bd audit: remove unu... |
1311 |
f->type, f->op, f->lsm_rule); |
86b2efbe3 audit: add fields... |
1312 1313 |
} break; |
29c1372d6 audit: allow othe... |
1314 1315 1316 1317 1318 |
case AUDIT_EXE: result = audit_exe_compare(current, e->rule.exe); if (f->op == Audit_not_equal) result = !result; break; |
86b2efbe3 audit: add fields... |
1319 1320 |
default: goto unlock_and_return; |
fe7752bab [PATCH] Fix audit... |
1321 |
} |
86b2efbe3 audit: add fields... |
1322 1323 1324 1325 1326 1327 |
if (result < 0) /* error */ goto unlock_and_return; if (!result) break; } if (result > 0) { |
d904ac032 audit: rename FIL... |
1328 |
if (e->rule.action == AUDIT_NEVER || listtype == AUDIT_FILTER_EXCLUDE) |
86b2efbe3 audit: add fields... |
1329 1330 |
ret = 0; break; |
fe7752bab [PATCH] Fix audit... |
1331 |
} |
fe7752bab [PATCH] Fix audit... |
1332 1333 1334 |
} unlock_and_return: rcu_read_unlock(); |
86b2efbe3 audit: add fields... |
1335 |
return ret; |
fe7752bab [PATCH] Fix audit... |
1336 |
} |
3dc7e3153 [PATCH] support f... |
1337 |
|
e45aa212e audit rules order... |
1338 |
static int update_lsm_rule(struct audit_krule *r) |
1a9d0797b audit_update_lsm_... |
1339 |
{ |
e45aa212e audit rules order... |
1340 |
struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
1a9d0797b audit_update_lsm_... |
1341 |
struct audit_entry *nentry; |
1a9d0797b audit_update_lsm_... |
1342 |
int err = 0; |
e45aa212e audit rules order... |
1343 |
if (!security_audit_rule_known(r)) |
1a9d0797b audit_update_lsm_... |
1344 |
return 0; |
ae7b8f410 Audit: clean up t... |
1345 |
nentry = audit_dupe_rule(r); |
34d99af52 audit: implement ... |
1346 1347 |
if (entry->rule.exe) audit_remove_mark(entry->rule.exe); |
1a9d0797b audit_update_lsm_... |
1348 1349 1350 1351 1352 |
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... |
1353 |
if (r->watch) |
e45aa212e audit rules order... |
1354 |
list_del(&r->rlist); |
1a9d0797b audit_update_lsm_... |
1355 |
list_del_rcu(&entry->list); |
e45aa212e audit rules order... |
1356 |
list_del(&r->list); |
1a9d0797b audit_update_lsm_... |
1357 |
} else { |
ae7b8f410 Audit: clean up t... |
1358 |
if (r->watch || r->tree) |
e45aa212e audit rules order... |
1359 |
list_replace_init(&r->rlist, &nentry->rule.rlist); |
1a9d0797b audit_update_lsm_... |
1360 |
list_replace_rcu(&entry->list, &nentry->list); |
e45aa212e audit rules order... |
1361 |
list_replace(&r->list, &nentry->rule.list); |
1a9d0797b audit_update_lsm_... |
1362 1363 1364 1365 1366 |
} call_rcu(&entry->rcu, audit_free_rule_rcu); return err; } |
04305e4af Audit: Final rena... |
1367 |
/* This function will re-initialize the lsm_rule field of all applicable rules. |
d7a96f3a1 Audit: internally... |
1368 |
* It will traverse the filter lists serarching for rules that contain LSM |
3dc7e3153 [PATCH] support f... |
1369 |
* specific filter fields. When such a rule is found, it is copied, the |
d7a96f3a1 Audit: internally... |
1370 |
* LSM field is re-initialized, and the old rule is replaced with the |
3dc7e3153 [PATCH] support f... |
1371 |
* updated rule. */ |
d7a96f3a1 Audit: internally... |
1372 |
int audit_update_lsm_rules(void) |
3dc7e3153 [PATCH] support f... |
1373 |
{ |
e45aa212e audit rules order... |
1374 |
struct audit_krule *r, *n; |
3dc7e3153 [PATCH] support f... |
1375 |
int i, err = 0; |
f368c07d7 [PATCH] audit: pa... |
1376 1377 |
/* audit_filter_mutex synchronizes the writers */ mutex_lock(&audit_filter_mutex); |
3dc7e3153 [PATCH] support f... |
1378 1379 |
for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
e45aa212e audit rules order... |
1380 1381 |
list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { int res = update_lsm_rule(r); |
1a9d0797b audit_update_lsm_... |
1382 1383 |
if (!err) err = res; |
3dc7e3153 [PATCH] support f... |
1384 1385 |
} } |
f368c07d7 [PATCH] audit: pa... |
1386 |
mutex_unlock(&audit_filter_mutex); |
3dc7e3153 [PATCH] support f... |
1387 1388 1389 |
return err; } |