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kernel/auditfilter.c
33.6 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 */ |
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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: * 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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DEFINE_MUTEX(audit_filter_mutex); |
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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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/* 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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/* 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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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)) { |
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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) { case AUDIT_MSGTYPE: if (entry->rule.listnr != AUDIT_FILTER_TYPE && entry->rule.listnr != AUDIT_FILTER_USER) return -EINVAL; break; }; |
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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: |
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case AUDIT_INODE: |
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/* 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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entry = audit_to_entry_common(data); |
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if (IS_ERR(entry)) goto exit_nofree; |
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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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/* 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; f->val = 0; } |
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if ((f->type == AUDIT_PID) || (f->type == AUDIT_PPID)) { struct pid *pid; rcu_read_lock(); pid = find_vpid(f->val); if (!pid) { rcu_read_unlock(); err = -ESRCH; goto exit_free; } f->val = pid_nr(pid); rcu_read_unlock(); } |
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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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pr_warn("audit rule for LSM \'%s\' is invalid ", str); |
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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: |
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data->buflen += data->values[i] = |
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audit_pack_string(&bufp, f->lsm_str); |
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break; |
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case AUDIT_WATCH: data->buflen += data->values[i] = |
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audit_pack_string(&bufp, audit_watch_path(krule->watch)); |
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break; |
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case AUDIT_DIR: data->buflen += data->values[i] = audit_pack_string(&bufp, audit_tree_path(krule->tree)); break; |
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|
598 599 600 601 |
case AUDIT_FILTERKEY: data->buflen += data->values[i] = audit_pack_string(&bufp, krule->filterkey); break; |
93315ed6d
|
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 |
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
|
621 622 623 |
return 1; for (i = 0; i < a->field_count; i++) { |
93315ed6d
|
624 625 |
if (a->fields[i].type != b->fields[i].type || a->fields[i].op != b->fields[i].op) |
fe7752bab
|
626 |
return 1; |
93315ed6d
|
627 628 |
switch(a->fields[i].type) { |
3a6b9f85c
|
629 630 631 632 633 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3
|
634 635 636 637 638 |
case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
04305e4af
|
639 |
if (strcmp(a->fields[i].lsm_str, b->fields[i].lsm_str)) |
3dc7e3153
|
640 641 |
return 1; break; |
f368c07d7
|
642 |
case AUDIT_WATCH: |
cfcad62c7
|
643 644 |
if (strcmp(audit_watch_path(a->watch), audit_watch_path(b->watch))) |
f368c07d7
|
645 646 |
return 1; break; |
74c3cbe33
|
647 648 649 650 651 |
case AUDIT_DIR: if (strcmp(audit_tree_path(a->tree), audit_tree_path(b->tree))) return 1; break; |
5adc8a6ad
|
652 653 654 655 656 |
case AUDIT_FILTERKEY: /* both filterkeys exist based on above type compare */ if (strcmp(a->filterkey, b->filterkey)) return 1; break; |
ca57ec0f0
|
657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 |
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
|
674 675 676 677 |
default: if (a->fields[i].val != b->fields[i].val) return 1; } |
fe7752bab
|
678 679 680 681 682 683 684 685 |
} for (i = 0; i < AUDIT_BITMASK_SIZE; i++) if (a->mask[i] != b->mask[i]) return 1; return 0; } |
04305e4af
|
686 |
/* Duplicate LSM field information. The lsm_rule is opaque, so must be |
3dc7e3153
|
687 |
* re-initialized. */ |
d7a96f3a1
|
688 |
static inline int audit_dupe_lsm_field(struct audit_field *df, |
3dc7e3153
|
689 690 691 |
struct audit_field *sf) { int ret = 0; |
04305e4af
|
692 |
char *lsm_str; |
3dc7e3153
|
693 |
|
04305e4af
|
694 695 696 |
/* our own copy of lsm_str */ lsm_str = kstrdup(sf->lsm_str, GFP_KERNEL); if (unlikely(!lsm_str)) |
3e1fbd12c
|
697 |
return -ENOMEM; |
04305e4af
|
698 |
df->lsm_str = lsm_str; |
3dc7e3153
|
699 |
|
04305e4af
|
700 701 702 |
/* our own (refreshed) copy of lsm_rule */ ret = security_audit_rule_init(df->type, df->op, df->lsm_str, (void **)&df->lsm_rule); |
3dc7e3153
|
703 704 705 |
/* Keep currently invalid fields around in case they * become valid after a policy reload. */ if (ret == -EINVAL) { |
f952d10ff
|
706 707 708 |
pr_warn("audit rule for LSM \'%s\' is invalid ", df->lsm_str); |
3dc7e3153
|
709 710 711 712 713 714 715 |
ret = 0; } return ret; } /* Duplicate an audit rule. This will be a deep copy with the exception |
d7a96f3a1
|
716 |
* of the watch - that pointer is carried over. The LSM specific fields |
3dc7e3153
|
717 |
* will be updated in the copy. The point is to be able to replace the old |
f368c07d7
|
718 719 720 |
* 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
|
721 |
struct audit_entry *audit_dupe_rule(struct audit_krule *old) |
3dc7e3153
|
722 723 724 725 |
{ u32 fcount = old->field_count; struct audit_entry *entry; struct audit_krule *new; |
5adc8a6ad
|
726 |
char *fk; |
3dc7e3153
|
727 728 729 730 731 732 733 734 735 736 737 738 739 |
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
|
740 |
new->prio = old->prio; |
3dc7e3153
|
741 |
new->buflen = old->buflen; |
f368c07d7
|
742 |
new->inode_f = old->inode_f; |
3dc7e3153
|
743 |
new->field_count = old->field_count; |
ae7b8f410
|
744 |
|
74c3cbe33
|
745 746 747 748 749 750 751 752 |
/* * 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
|
753 |
memcpy(new->fields, old->fields, sizeof(struct audit_field) * fcount); |
04305e4af
|
754 |
/* deep copy this information, updating the lsm_rule fields, because |
3dc7e3153
|
755 756 757 |
* the originals will all be freed when the old rule is freed. */ for (i = 0; i < fcount; i++) { switch (new->fields[i].type) { |
3a6b9f85c
|
758 759 760 761 762 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
6e5a2d1d3
|
763 764 765 766 767 |
case AUDIT_OBJ_USER: case AUDIT_OBJ_ROLE: case AUDIT_OBJ_TYPE: case AUDIT_OBJ_LEV_LOW: case AUDIT_OBJ_LEV_HIGH: |
d7a96f3a1
|
768 |
err = audit_dupe_lsm_field(&new->fields[i], |
3dc7e3153
|
769 |
&old->fields[i]); |
5adc8a6ad
|
770 771 772 773 774 775 776 |
break; case AUDIT_FILTERKEY: fk = kstrdup(old->filterkey, GFP_KERNEL); if (unlikely(!fk)) err = -ENOMEM; else new->filterkey = fk; |
3dc7e3153
|
777 778 779 780 781 782 |
} if (err) { audit_free_rule(entry); return ERR_PTR(err); } } |
ae7b8f410
|
783 784 785 |
if (old->watch) { audit_get_watch(old->watch); new->watch = old->watch; |
f368c07d7
|
786 |
} |
3dc7e3153
|
787 788 |
return entry; } |
f368c07d7
|
789 790 791 |
/* 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
|
792 |
struct list_head **p) |
f368c07d7
|
793 794 |
{ struct audit_entry *e, *found = NULL; |
36c4f1b18
|
795 |
struct list_head *list; |
f368c07d7
|
796 |
int h; |
36c4f1b18
|
797 798 799 800 |
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
|
801 802 803 804 805 806 807 808 809 810 |
/* 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
|
811 812 |
} else { *p = list = &audit_filter_list[entry->rule.listnr]; |
f368c07d7
|
813 814 815 816 817 818 819 820 821 822 823 |
} list_for_each_entry(e, list, list) if (!audit_compare_rule(&entry->rule, &e->rule)) { found = e; goto out; } out: return found; } |
0590b9335
|
824 825 |
static u64 prio_low = ~0ULL/2; static u64 prio_high = ~0ULL/2 - 1; |
f368c07d7
|
826 |
/* Add rule to given filterlist if not a duplicate. */ |
36c4f1b18
|
827 |
static inline int audit_add_rule(struct audit_entry *entry) |
fe7752bab
|
828 |
{ |
93315ed6d
|
829 |
struct audit_entry *e; |
f368c07d7
|
830 |
struct audit_watch *watch = entry->rule.watch; |
74c3cbe33
|
831 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18
|
832 |
struct list_head *list; |
ae7b8f410
|
833 |
int err; |
471a5c7c8
|
834 835 836 837 838 839 840 841 |
#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
|
842 |
|
f368c07d7
|
843 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18
|
844 |
e = audit_find_rule(entry, &list); |
f368c07d7
|
845 |
if (e) { |
35fe4d0b1
|
846 |
mutex_unlock(&audit_filter_mutex); |
f368c07d7
|
847 |
err = -EEXIST; |
74c3cbe33
|
848 849 850 |
/* normally audit_add_tree_rule() will free it on failure */ if (tree) audit_put_tree(tree); |
f368c07d7
|
851 852 |
goto error; } |
fe7752bab
|
853 |
|
f368c07d7
|
854 855 |
if (watch) { /* audit_filter_mutex is dropped and re-taken during this call */ |
ae7b8f410
|
856 |
err = audit_add_watch(&entry->rule, &list); |
f368c07d7
|
857 858 |
if (err) { mutex_unlock(&audit_filter_mutex); |
2f992ee85
|
859 860 861 862 863 864 |
/* * normally audit_add_tree_rule() will free it * on failure */ if (tree) audit_put_tree(tree); |
f368c07d7
|
865 866 |
goto error; } |
fe7752bab
|
867 |
} |
74c3cbe33
|
868 869 870 871 872 873 874 |
if (tree) { err = audit_add_tree_rule(&entry->rule); if (err) { mutex_unlock(&audit_filter_mutex); goto error; } } |
fe7752bab
|
875 |
|
0590b9335
|
876 877 878 879 880 881 882 |
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
|
883 |
if (entry->rule.flags & AUDIT_FILTER_PREPEND) { |
e45aa212e
|
884 885 |
list_add(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab
|
886 |
list_add_rcu(&entry->list, list); |
6a2bceec0
|
887 |
entry->rule.flags &= ~AUDIT_FILTER_PREPEND; |
fe7752bab
|
888 |
} else { |
e45aa212e
|
889 890 |
list_add_tail(&entry->rule.list, &audit_rules_list[entry->rule.listnr]); |
fe7752bab
|
891 892 |
list_add_tail_rcu(&entry->list, list); } |
471a5c7c8
|
893 894 895 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules++; |
e54dc2431
|
896 897 898 |
if (!audit_match_signal(entry)) audit_signals++; |
471a5c7c8
|
899 |
#endif |
f368c07d7
|
900 |
mutex_unlock(&audit_filter_mutex); |
fe7752bab
|
901 |
|
f368c07d7
|
902 903 904 |
return 0; error: |
f368c07d7
|
905 906 907 |
if (watch) audit_put_watch(watch); /* tmp watch, matches initial get */ return err; |
fe7752bab
|
908 |
} |
f368c07d7
|
909 |
/* Remove an existing rule from filterlist. */ |
36c4f1b18
|
910 |
static inline int audit_del_rule(struct audit_entry *entry) |
fe7752bab
|
911 912 |
{ struct audit_entry *e; |
cfcad62c7
|
913 |
struct audit_watch *watch = entry->rule.watch; |
74c3cbe33
|
914 |
struct audit_tree *tree = entry->rule.tree; |
36c4f1b18
|
915 |
struct list_head *list; |
36c4f1b18
|
916 |
int ret = 0; |
471a5c7c8
|
917 918 919 920 921 922 923 924 |
#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
|
925 |
|
f368c07d7
|
926 |
mutex_lock(&audit_filter_mutex); |
36c4f1b18
|
927 |
e = audit_find_rule(entry, &list); |
f368c07d7
|
928 929 930 931 932 |
if (!e) { mutex_unlock(&audit_filter_mutex); ret = -ENOENT; goto out; } |
cfcad62c7
|
933 |
if (e->rule.watch) |
a05fb6cc5
|
934 |
audit_remove_watch_rule(&e->rule); |
f368c07d7
|
935 |
|
74c3cbe33
|
936 937 |
if (e->rule.tree) audit_remove_tree_rule(&e->rule); |
f368c07d7
|
938 |
list_del_rcu(&e->list); |
e45aa212e
|
939 |
list_del(&e->rule.list); |
f368c07d7
|
940 |
call_rcu(&e->rcu, audit_free_rule_rcu); |
471a5c7c8
|
941 942 943 |
#ifdef CONFIG_AUDITSYSCALL if (!dont_count) audit_n_rules--; |
e54dc2431
|
944 945 946 |
if (!audit_match_signal(entry)) audit_signals--; |
471a5c7c8
|
947 |
#endif |
f368c07d7
|
948 |
mutex_unlock(&audit_filter_mutex); |
f368c07d7
|
949 |
out: |
cfcad62c7
|
950 951 |
if (watch) audit_put_watch(watch); /* match initial get */ |
74c3cbe33
|
952 953 |
if (tree) audit_put_tree(tree); /* that's the temporary one */ |
f368c07d7
|
954 955 |
return ret; |
fe7752bab
|
956 |
} |
93315ed6d
|
957 |
/* List rules using struct audit_rule_data. */ |
f9441639e
|
958 |
static void audit_list_rules(__u32 portid, int seq, struct sk_buff_head *q) |
93315ed6d
|
959 |
{ |
9044e6bca
|
960 |
struct sk_buff *skb; |
e45aa212e
|
961 |
struct audit_krule *r; |
93315ed6d
|
962 |
int i; |
f368c07d7
|
963 964 |
/* This is a blocking read, so use audit_filter_mutex instead of rcu * iterator to sync with list writers. */ |
93315ed6d
|
965 |
for (i=0; i<AUDIT_NR_FILTERS; i++) { |
e45aa212e
|
966 |
list_for_each_entry(r, &audit_rules_list[i], list) { |
f368c07d7
|
967 |
struct audit_rule_data *data; |
e45aa212e
|
968 |
data = audit_krule_to_data(r); |
f368c07d7
|
969 970 |
if (unlikely(!data)) break; |
f9441639e
|
971 972 973 |
skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, 0, 1, data, sizeof(*data) + data->buflen); |
9044e6bca
|
974 975 |
if (skb) skb_queue_tail(q, skb); |
93315ed6d
|
976 977 978 |
kfree(data); } } |
f9441639e
|
979 |
skb = audit_make_reply(portid, seq, AUDIT_LIST_RULES, 1, 1, NULL, 0); |
9044e6bca
|
980 981 |
if (skb) skb_queue_tail(q, skb); |
93315ed6d
|
982 |
} |
5adc8a6ad
|
983 |
/* Log rule additions and removals */ |
dc9eb698f
|
984 |
static void audit_log_rule_change(char *action, struct audit_krule *rule, int res) |
5adc8a6ad
|
985 986 |
{ struct audit_buffer *ab; |
dc9eb698f
|
987 |
uid_t loginuid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
4440e8548
|
988 |
unsigned int sessionid = audit_get_sessionid(current); |
5adc8a6ad
|
989 |
|
1a6b9f231
|
990 991 |
if (!audit_enabled) return; |
5adc8a6ad
|
992 993 994 |
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); if (!ab) return; |
dc9eb698f
|
995 |
audit_log_format(ab, "auid=%u ses=%u" ,loginuid, sessionid); |
b122c3767
|
996 |
audit_log_task_context(ab); |
9d9609851
|
997 998 999 |
audit_log_format(ab, " op="); audit_log_string(ab, action); audit_log_key(ab, rule->filterkey); |
5adc8a6ad
|
1000 1001 1002 |
audit_log_format(ab, " list=%d res=%d", rule->listnr, res); audit_log_end(ab); } |
fe7752bab
|
1003 |
/** |
ce0d9f046
|
1004 |
* audit_rule_change - apply all rules to the specified message type |
fe7752bab
|
1005 |
* @type: audit message type |
f9441639e
|
1006 |
* @portid: target port id for netlink audit messages |
fe7752bab
|
1007 1008 |
* @seq: netlink audit message sequence (serial) number * @data: payload data |
93315ed6d
|
1009 |
* @datasz: size of payload data |
fe7752bab
|
1010 |
*/ |
ce0d9f046
|
1011 1012 |
int audit_rule_change(int type, __u32 portid, int seq, void *data, size_t datasz) |
fe7752bab
|
1013 |
{ |
93315ed6d
|
1014 1015 |
int err = 0; struct audit_entry *entry; |
fe7752bab
|
1016 1017 |
switch (type) { |
93315ed6d
|
1018 |
case AUDIT_ADD_RULE: |
189009091
|
1019 |
entry = audit_data_to_entry(data, datasz); |
93315ed6d
|
1020 1021 |
if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18
|
1022 |
err = audit_add_rule(entry); |
dc9eb698f
|
1023 |
audit_log_rule_change("add rule", &entry->rule, !err); |
5d3301088
|
1024 |
if (err) |
93315ed6d
|
1025 |
audit_free_rule(entry); |
fe7752bab
|
1026 |
break; |
93315ed6d
|
1027 |
case AUDIT_DEL_RULE: |
189009091
|
1028 |
entry = audit_data_to_entry(data, datasz); |
93315ed6d
|
1029 1030 |
if (IS_ERR(entry)) return PTR_ERR(entry); |
36c4f1b18
|
1031 |
err = audit_del_rule(entry); |
dc9eb698f
|
1032 |
audit_log_rule_change("remove rule", &entry->rule, !err); |
93315ed6d
|
1033 |
audit_free_rule(entry); |
fe7752bab
|
1034 1035 1036 1037 1038 1039 1040 |
break; default: return -EINVAL; } return err; } |
ce0d9f046
|
1041 1042 |
/** * audit_list_rules_send - list the audit rules |
d211f177b
|
1043 |
* @request_skb: skb of request we are replying to (used to target the reply) |
ce0d9f046
|
1044 1045 |
* @seq: netlink audit message sequence (serial) number */ |
6f285b19d
|
1046 |
int audit_list_rules_send(struct sk_buff *request_skb, int seq) |
ce0d9f046
|
1047 |
{ |
6f285b19d
|
1048 1049 |
u32 portid = NETLINK_CB(request_skb).portid; struct net *net = sock_net(NETLINK_CB(request_skb).sk); |
ce0d9f046
|
1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 |
struct task_struct *tsk; struct audit_netlink_list *dest; int err = 0; /* 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 */ dest = kmalloc(sizeof(struct audit_netlink_list), GFP_KERNEL); if (!dest) return -ENOMEM; |
6f285b19d
|
1063 |
dest->net = get_net(net); |
ce0d9f046
|
1064 |
dest->portid = portid; |
ce0d9f046
|
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
skb_queue_head_init(&dest->q); mutex_lock(&audit_filter_mutex); audit_list_rules(portid, seq, &dest->q); mutex_unlock(&audit_filter_mutex); tsk = kthread_run(audit_send_list, dest, "audit_send_list"); if (IS_ERR(tsk)) { skb_queue_purge(&dest->q); kfree(dest); err = PTR_ERR(tsk); } return err; } |
5af75d8d5
|
1080 |
int audit_comparator(u32 left, u32 op, u32 right) |
fe7752bab
|
1081 1082 |
{ switch (op) { |
5af75d8d5
|
1083 |
case Audit_equal: |
fe7752bab
|
1084 |
return (left == right); |
5af75d8d5
|
1085 |
case Audit_not_equal: |
fe7752bab
|
1086 |
return (left != right); |
5af75d8d5
|
1087 |
case Audit_lt: |
fe7752bab
|
1088 |
return (left < right); |
5af75d8d5
|
1089 |
case Audit_le: |
fe7752bab
|
1090 |
return (left <= right); |
5af75d8d5
|
1091 |
case Audit_gt: |
fe7752bab
|
1092 |
return (left > right); |
5af75d8d5
|
1093 |
case Audit_ge: |
fe7752bab
|
1094 |
return (left >= right); |
5af75d8d5
|
1095 |
case Audit_bitmask: |
74f2345b6
|
1096 |
return (left & right); |
5af75d8d5
|
1097 |
case Audit_bittest: |
74f2345b6
|
1098 |
return ((left & right) == right); |
5af75d8d5
|
1099 1100 1101 |
default: BUG(); return 0; |
fe7752bab
|
1102 1103 |
} } |
ca57ec0f0
|
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 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 1148 |
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
|
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 |
/** * 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
|
1178 1179 1180 1181 1182 1183 1184 1185 1186 |
/** * 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
|
1187 |
{ |
e3d6b07b8
|
1188 |
int dlen, pathlen; |
f368c07d7
|
1189 |
const char *p; |
f368c07d7
|
1190 |
dlen = strlen(dname); |
29e9a3467
|
1191 1192 |
pathlen = strlen(path); if (pathlen < dlen) |
f368c07d7
|
1193 |
return 1; |
e3d6b07b8
|
1194 |
parentlen = parentlen == AUDIT_NAME_FULL ? parent_len(path) : parentlen; |
29e9a3467
|
1195 |
if (pathlen - parentlen != dlen) |
f368c07d7
|
1196 |
return 1; |
29e9a3467
|
1197 1198 |
p = path + parentlen; |
fe7752bab
|
1199 |
|
f368c07d7
|
1200 1201 |
return strncmp(p, dname, dlen); } |
fe7752bab
|
1202 |
|
62062cf8a
|
1203 |
static int audit_filter_user_rules(struct audit_krule *rule, int type, |
fe7752bab
|
1204 1205 1206 1207 1208 |
enum audit_state *state) { int i; for (i = 0; i < rule->field_count; i++) { |
93315ed6d
|
1209 |
struct audit_field *f = &rule->fields[i]; |
f1dc4867f
|
1210 |
pid_t pid; |
fe7752bab
|
1211 |
int result = 0; |
c53fa1ed9
|
1212 |
u32 sid; |
fe7752bab
|
1213 |
|
93315ed6d
|
1214 |
switch (f->type) { |
fe7752bab
|
1215 |
case AUDIT_PID: |
f1dc4867f
|
1216 1217 |
pid = task_pid_nr(current); result = audit_comparator(pid, f->op, f->val); |
fe7752bab
|
1218 1219 |
break; case AUDIT_UID: |
ca57ec0f0
|
1220 |
result = audit_uid_comparator(current_uid(), f->op, f->uid); |
fe7752bab
|
1221 1222 |
break; case AUDIT_GID: |
ca57ec0f0
|
1223 |
result = audit_gid_comparator(current_gid(), f->op, f->gid); |
fe7752bab
|
1224 1225 |
break; case AUDIT_LOGINUID: |
ca57ec0f0
|
1226 1227 |
result = audit_uid_comparator(audit_get_loginuid(current), f->op, f->uid); |
fe7752bab
|
1228 |
break; |
780a7654c
|
1229 1230 1231 1232 |
case AUDIT_LOGINUID_SET: result = audit_comparator(audit_loginuid_set(current), f->op, f->val); break; |
62062cf8a
|
1233 1234 1235 |
case AUDIT_MSGTYPE: result = audit_comparator(type, f->op, f->val); break; |
d29be158a
|
1236 1237 1238 1239 1240 |
case AUDIT_SUBJ_USER: case AUDIT_SUBJ_ROLE: case AUDIT_SUBJ_TYPE: case AUDIT_SUBJ_SEN: case AUDIT_SUBJ_CLR: |
c53fa1ed9
|
1241 1242 1243 |
if (f->lsm_rule) { security_task_getsecid(current, &sid); result = security_audit_rule_match(sid, |
d29be158a
|
1244 1245 1246 1247 |
f->type, f->op, f->lsm_rule, NULL); |
c53fa1ed9
|
1248 |
} |
d29be158a
|
1249 |
break; |
fe7752bab
|
1250 1251 1252 1253 1254 1255 1256 |
} if (!result) return 0; } switch (rule->action) { case AUDIT_NEVER: *state = AUDIT_DISABLED; break; |
fe7752bab
|
1257 1258 1259 1260 |
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break; } return 1; } |
62062cf8a
|
1261 |
int audit_filter_user(int type) |
fe7752bab
|
1262 |
{ |
11f57cedc
|
1263 |
enum audit_state state = AUDIT_DISABLED; |
fe7752bab
|
1264 |
struct audit_entry *e; |
724e4fcc8
|
1265 1266 1267 |
int rc, ret; ret = 1; /* Audit by default */ |
fe7752bab
|
1268 1269 1270 |
rcu_read_lock(); list_for_each_entry_rcu(e, &audit_filter_list[AUDIT_FILTER_USER], list) { |
724e4fcc8
|
1271 1272 1273 |
rc = audit_filter_user_rules(&e->rule, type, &state); if (rc) { if (rc > 0 && state == AUDIT_DISABLED) |
fe7752bab
|
1274 1275 1276 1277 1278 |
ret = 0; break; } } rcu_read_unlock(); |
724e4fcc8
|
1279 |
return ret; |
fe7752bab
|
1280 1281 1282 1283 1284 1285 |
} int audit_filter_type(int type) { struct audit_entry *e; int result = 0; |
9ce34218a
|
1286 |
|
fe7752bab
|
1287 1288 1289 1290 1291 1292 |
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
|
1293 |
int i; |
93315ed6d
|
1294 1295 1296 1297 |
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
|
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 |
if (!result) break; } } if (result) goto unlock_and_return; } unlock_and_return: rcu_read_unlock(); return result; } |
3dc7e3153
|
1309 |
|
e45aa212e
|
1310 |
static int update_lsm_rule(struct audit_krule *r) |
1a9d0797b
|
1311 |
{ |
e45aa212e
|
1312 |
struct audit_entry *entry = container_of(r, struct audit_entry, rule); |
1a9d0797b
|
1313 |
struct audit_entry *nentry; |
1a9d0797b
|
1314 |
int err = 0; |
e45aa212e
|
1315 |
if (!security_audit_rule_known(r)) |
1a9d0797b
|
1316 |
return 0; |
ae7b8f410
|
1317 |
nentry = audit_dupe_rule(r); |
1a9d0797b
|
1318 1319 1320 1321 1322 |
if (IS_ERR(nentry)) { /* save the first error encountered for the * return value */ err = PTR_ERR(nentry); audit_panic("error updating LSM filters"); |
ae7b8f410
|
1323 |
if (r->watch) |
e45aa212e
|
1324 |
list_del(&r->rlist); |
1a9d0797b
|
1325 |
list_del_rcu(&entry->list); |
e45aa212e
|
1326 |
list_del(&r->list); |
1a9d0797b
|
1327 |
} else { |
ae7b8f410
|
1328 |
if (r->watch || r->tree) |
e45aa212e
|
1329 |
list_replace_init(&r->rlist, &nentry->rule.rlist); |
1a9d0797b
|
1330 |
list_replace_rcu(&entry->list, &nentry->list); |
e45aa212e
|
1331 |
list_replace(&r->list, &nentry->rule.list); |
1a9d0797b
|
1332 1333 1334 1335 1336 |
} call_rcu(&entry->rcu, audit_free_rule_rcu); return err; } |
04305e4af
|
1337 |
/* This function will re-initialize the lsm_rule field of all applicable rules. |
d7a96f3a1
|
1338 |
* It will traverse the filter lists serarching for rules that contain LSM |
3dc7e3153
|
1339 |
* specific filter fields. When such a rule is found, it is copied, the |
d7a96f3a1
|
1340 |
* LSM field is re-initialized, and the old rule is replaced with the |
3dc7e3153
|
1341 |
* updated rule. */ |
d7a96f3a1
|
1342 |
int audit_update_lsm_rules(void) |
3dc7e3153
|
1343 |
{ |
e45aa212e
|
1344 |
struct audit_krule *r, *n; |
3dc7e3153
|
1345 |
int i, err = 0; |
f368c07d7
|
1346 1347 |
/* audit_filter_mutex synchronizes the writers */ mutex_lock(&audit_filter_mutex); |
3dc7e3153
|
1348 1349 |
for (i = 0; i < AUDIT_NR_FILTERS; i++) { |
e45aa212e
|
1350 1351 |
list_for_each_entry_safe(r, n, &audit_rules_list[i], list) { int res = update_lsm_rule(r); |
1a9d0797b
|
1352 1353 |
if (!err) err = res; |
3dc7e3153
|
1354 1355 |
} } |
f368c07d7
|
1356 |
mutex_unlock(&audit_filter_mutex); |
3dc7e3153
|
1357 1358 1359 |
return err; } |