diff options
Diffstat (limited to 'security')
| -rw-r--r-- | security/Kconfig | 8 | ||||
| -rw-r--r-- | security/Makefile | 3 | ||||
| -rw-r--r-- | security/commoncap.c | 2 | ||||
| -rw-r--r-- | security/inode.c | 33 | ||||
| -rw-r--r-- | security/security.c | 8 | ||||
| -rw-r--r-- | security/selinux/Kconfig | 3 | ||||
| -rw-r--r-- | security/selinux/avc.c | 2 | ||||
| -rw-r--r-- | security/selinux/hooks.c | 62 | ||||
| -rw-r--r-- | security/selinux/include/avc.h | 4 | ||||
| -rw-r--r-- | security/selinux/include/security.h | 15 | ||||
| -rw-r--r-- | security/selinux/ss/avtab.c | 8 | ||||
| -rw-r--r-- | security/selinux/ss/conditional.c | 18 | ||||
| -rw-r--r-- | security/selinux/ss/conditional.h | 2 | ||||
| -rw-r--r-- | security/selinux/ss/ebitmap.c | 4 | ||||
| -rw-r--r-- | security/selinux/ss/hashtab.c | 6 | ||||
| -rw-r--r-- | security/selinux/ss/mls.c | 14 | ||||
| -rw-r--r-- | security/selinux/ss/policydb.c | 225 | ||||
| -rw-r--r-- | security/selinux/ss/policydb.h | 5 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 180 | ||||
| -rw-r--r-- | security/selinux/ss/sidtab.c | 12 | ||||
| -rw-r--r-- | security/smack/smack.h | 1 | ||||
| -rw-r--r-- | security/smack/smack_access.c | 10 | ||||
| -rw-r--r-- | security/smack/smackfs.c | 92 |
23 files changed, 603 insertions, 114 deletions
diff --git a/security/Kconfig b/security/Kconfig index 559293922a4..d9f47ce7e20 100644 --- a/security/Kconfig +++ b/security/Kconfig @@ -51,6 +51,14 @@ config SECURITY If you are unsure how to answer this question, answer N. +config SECURITYFS + bool "Enable the securityfs filesystem" + help + This will build the securityfs filesystem. It is currently used by + the TPM bios character driver. It is not used by SELinux or SMACK. + + If you are unsure how to answer this question, answer N. + config SECURITY_NETWORK bool "Socket and Networking Security Hooks" depends on SECURITY diff --git a/security/Makefile b/security/Makefile index f65426099aa..c05c127fff9 100644 --- a/security/Makefile +++ b/security/Makefile @@ -10,7 +10,8 @@ subdir-$(CONFIG_SECURITY_SMACK) += smack obj-y += commoncap.o # Object file lists -obj-$(CONFIG_SECURITY) += security.o capability.o inode.o +obj-$(CONFIG_SECURITY) += security.o capability.o +obj-$(CONFIG_SECURITYFS) += inode.o # Must precede capability.o in order to stack properly. obj-$(CONFIG_SECURITY_SELINUX) += selinux/built-in.o obj-$(CONFIG_SECURITY_SMACK) += smack/built-in.o diff --git a/security/commoncap.c b/security/commoncap.c index e4c4b3fc0c0..399bfdb9e2d 100644 --- a/security/commoncap.c +++ b/security/commoncap.c @@ -541,7 +541,7 @@ int cap_task_post_setuid (uid_t old_ruid, uid_t old_euid, uid_t old_suid, * yet with increased caps. * So we check for increased caps on the target process. */ -static inline int cap_safe_nice(struct task_struct *p) +static int cap_safe_nice(struct task_struct *p) { if (!cap_issubset(p->cap_permitted, current->cap_permitted) && !capable(CAP_SYS_NICE)) diff --git a/security/inode.c b/security/inode.c index acc6cf0d790..ca4958ebad8 100644 --- a/security/inode.c +++ b/security/inode.c @@ -190,7 +190,7 @@ static int create_by_name(const char *name, mode_t mode, * @name: a pointer to a string containing the name of the file to create. * @mode: the permission that the file should have * @parent: a pointer to the parent dentry for this file. This should be a - * directory dentry if set. If this paramater is NULL, then the + * directory dentry if set. If this parameter is %NULL, then the * file will be created in the root of the securityfs filesystem. * @data: a pointer to something that the caller will want to get to later * on. The inode.i_private pointer will point to this value on @@ -199,18 +199,18 @@ static int create_by_name(const char *name, mode_t mode, * this file. * * This is the basic "create a file" function for securityfs. It allows for a - * wide range of flexibility in createing a file, or a directory (if you + * wide range of flexibility in creating a file, or a directory (if you * want to create a directory, the securityfs_create_dir() function is - * recommended to be used instead.) + * recommended to be used instead). * - * This function will return a pointer to a dentry if it succeeds. This + * This function returns a pointer to a dentry if it succeeds. This * pointer must be passed to the securityfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, NULL will be returned. + * you are responsible here). If an error occurs, %NULL is returned. * - * If securityfs is not enabled in the kernel, the value -ENODEV will be + * If securityfs is not enabled in the kernel, the value %-ENODEV is * returned. It is not wise to check for this value, but rather, check for - * NULL or !NULL instead as to eliminate the need for #ifdef in the calling + * %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling * code. */ struct dentry *securityfs_create_file(const char *name, mode_t mode, @@ -252,19 +252,19 @@ EXPORT_SYMBOL_GPL(securityfs_create_file); * @name: a pointer to a string containing the name of the directory to * create. * @parent: a pointer to the parent dentry for this file. This should be a - * directory dentry if set. If this paramater is NULL, then the + * directory dentry if set. If this parameter is %NULL, then the * directory will be created in the root of the securityfs filesystem. * - * This function creates a directory in securityfs with the given name. + * This function creates a directory in securityfs with the given @name. * - * This function will return a pointer to a dentry if it succeeds. This + * This function returns a pointer to a dentry if it succeeds. This * pointer must be passed to the securityfs_remove() function when the file is * to be removed (no automatic cleanup happens if your module is unloaded, - * you are responsible here.) If an error occurs, NULL will be returned. + * you are responsible here). If an error occurs, %NULL will be returned. * - * If securityfs is not enabled in the kernel, the value -ENODEV will be + * If securityfs is not enabled in the kernel, the value %-ENODEV is * returned. It is not wise to check for this value, but rather, check for - * NULL or !NULL instead as to eliminate the need for #ifdef in the calling + * %NULL or !%NULL instead as to eliminate the need for #ifdef in the calling * code. */ struct dentry *securityfs_create_dir(const char *name, struct dentry *parent) @@ -278,16 +278,15 @@ EXPORT_SYMBOL_GPL(securityfs_create_dir); /** * securityfs_remove - removes a file or directory from the securityfs filesystem * - * @dentry: a pointer to a the dentry of the file or directory to be - * removed. + * @dentry: a pointer to a the dentry of the file or directory to be removed. * * This function removes a file or directory in securityfs that was previously * created with a call to another securityfs function (like * securityfs_create_file() or variants thereof.) * * This function is required to be called in order for the file to be - * removed, no automatic cleanup of files will happen when a module is - * removed, you are responsible here. + * removed. No automatic cleanup of files will happen when a module is + * removed; you are responsible here. */ void securityfs_remove(struct dentry *dentry) { diff --git a/security/security.c b/security/security.c index 3a4b4f55b33..255b08559b2 100644 --- a/security/security.c +++ b/security/security.c @@ -82,8 +82,8 @@ __setup("security=", choose_lsm); * * Return true if: * -The passed LSM is the one chosen by user at boot time, - * -or user didsn't specify a specific LSM and we're the first to ask - * for registeration permissoin, + * -or user didn't specify a specific LSM and we're the first to ask + * for registration permission, * -or the passed LSM is currently loaded. * Otherwise, return false. */ @@ -101,13 +101,13 @@ int __init security_module_enable(struct security_operations *ops) * register_security - registers a security framework with the kernel * @ops: a pointer to the struct security_options that is to be registered * - * This function is to allow a security module to register itself with the + * This function allows a security module to register itself with the * kernel security subsystem. Some rudimentary checking is done on the @ops * value passed to this function. You'll need to check first if your LSM * is allowed to register its @ops by calling security_module_enable(@ops). * * If there is already a security module registered with the kernel, - * an error will be returned. Otherwise 0 is returned on success. + * an error will be returned. Otherwise %0 is returned on success. */ int register_security(struct security_operations *ops) { diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig index a436d1cfa88..26301dd651d 100644 --- a/security/selinux/Kconfig +++ b/security/selinux/Kconfig @@ -6,9 +6,6 @@ config SECURITY_SELINUX help This selects NSA Security-Enhanced Linux (SELinux). You will also need a policy configuration and a labeled filesystem. - You can obtain the policy compiler (checkpolicy), the utility for - labeling filesystems (setfiles), and an example policy configuration - from <http://www.nsa.gov/selinux/>. If you are unsure how to answer this question, answer N. config SECURITY_SELINUX_BOOTPARAM diff --git a/security/selinux/avc.c b/security/selinux/avc.c index 114b4b4c97b..cb30c7e350b 100644 --- a/security/selinux/avc.c +++ b/security/selinux/avc.c @@ -136,7 +136,7 @@ static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass) * @tclass: target security class * @av: access vector */ -static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av) +void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av) { const char **common_pts = NULL; u32 common_base = 0; diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 03fc6a81ae3..4a7374c12d9 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -957,7 +957,8 @@ out_err: return rc; } -void selinux_write_opts(struct seq_file *m, struct security_mnt_opts *opts) +static void selinux_write_opts(struct seq_file *m, + struct security_mnt_opts *opts) { int i; char *prefix; @@ -1290,7 +1291,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent /* Default to the fs superblock SID. */ isec->sid = sbsec->sid; - if (sbsec->proc) { + if (sbsec->proc && !S_ISLNK(inode->i_mode)) { struct proc_inode *proci = PROC_I(inode); if (proci->pde) { isec->sclass = inode_mode_to_security_class(inode->i_mode); @@ -3548,38 +3549,44 @@ out: #endif /* IPV6 */ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad, - char **addrp, int src, u8 *proto) + char **_addrp, int src, u8 *proto) { - int ret = 0; + char *addrp; + int ret; switch (ad->u.net.family) { case PF_INET: ret = selinux_parse_skb_ipv4(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v4info.saddr : - &ad->u.net.v4info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v4info.saddr : + &ad->u.net.v4info.daddr); + goto okay; #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) case PF_INET6: ret = selinux_parse_skb_ipv6(skb, ad, proto); - if (ret || !addrp) - break; - *addrp = (char *)(src ? &ad->u.net.v6info.saddr : - &ad->u.net.v6info.daddr); - break; + if (ret) + goto parse_error; + addrp = (char *)(src ? &ad->u.net.v6info.saddr : + &ad->u.net.v6info.daddr); + goto okay; #endif /* IPV6 */ default: - break; + addrp = NULL; + goto okay; } - if (unlikely(ret)) - printk(KERN_WARNING - "SELinux: failure in selinux_parse_skb()," - " unable to parse packet\n"); - +parse_error: + printk(KERN_WARNING + "SELinux: failure in selinux_parse_skb()," + " unable to parse packet\n"); return ret; + +okay: + if (_addrp) + *_addrp = addrp; + return 0; } /** @@ -5219,8 +5226,12 @@ static int selinux_setprocattr(struct task_struct *p, if (sid == 0) return -EINVAL; - - /* Only allow single threaded processes to change context */ + /* + * SELinux allows to change context in the following case only. + * - Single threaded processes. + * - Multi threaded processes intend to change its context into + * more restricted domain (defined by TYPEBOUNDS statement). + */ if (atomic_read(&p->mm->mm_users) != 1) { struct task_struct *g, *t; struct mm_struct *mm = p->mm; @@ -5228,11 +5239,16 @@ static int selinux_setprocattr(struct task_struct *p, do_each_thread(g, t) { if (t->mm == mm && t != p) { read_unlock(&tasklist_lock); - return -EPERM; + error = security_bounded_transition(tsec->sid, sid); + if (!error) + goto boundary_ok; + + return error; } } while_each_thread(g, t); read_unlock(&tasklist_lock); } +boundary_ok: /* Check permissions for the transition. */ error = avc_has_perm(tsec->sid, sid, SECCLASS_PROCESS, diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h index 7b9769f5e77..d12ff1a9c0a 100644 --- a/security/selinux/include/avc.h +++ b/security/selinux/include/avc.h @@ -12,6 +12,7 @@ #include <linux/kdev_t.h> #include <linux/spinlock.h> #include <linux/init.h> +#include <linux/audit.h> #include <linux/in6.h> #include <linux/path.h> #include <asm/system.h> @@ -126,6 +127,9 @@ int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid, u32 events, u32 ssid, u32 tsid, u16 tclass, u32 perms); +/* Shows permission in human readable form */ +void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av); + /* Exported to selinuxfs */ int avc_get_hash_stats(char *page); extern unsigned int avc_cache_threshold; diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index 7c543003d65..72447370bc9 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -27,13 +27,14 @@ #define POLICYDB_VERSION_RANGETRANS 21 #define POLICYDB_VERSION_POLCAP 22 #define POLICYDB_VERSION_PERMISSIVE 23 +#define POLICYDB_VERSION_BOUNDARY 24 /* Range of policy versions we understand*/ #define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE #ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX #define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE #else -#define POLICYDB_VERSION_MAX POLICYDB_VERSION_PERMISSIVE +#define POLICYDB_VERSION_MAX POLICYDB_VERSION_BOUNDARY #endif #define CONTEXT_MNT 0x01 @@ -62,6 +63,16 @@ enum { extern int selinux_policycap_netpeer; extern int selinux_policycap_openperm; +/* + * type_datum properties + * available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY + */ +#define TYPEDATUM_PROPERTY_PRIMARY 0x0001 +#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002 + +/* limitation of boundary depth */ +#define POLICYDB_BOUNDS_MAXDEPTH 4 + int security_load_policy(void *data, size_t len); int security_policycap_supported(unsigned int req_cap); @@ -117,6 +128,8 @@ int security_node_sid(u16 domain, void *addr, u32 addrlen, int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, u16 tclass); +int security_bounded_transition(u32 oldsid, u32 newsid); + int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid); int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type, diff --git a/security/selinux/ss/avtab.c b/security/selinux/ss/avtab.c index a1be97f8bee..1215b8e47db 100644 --- a/security/selinux/ss/avtab.c +++ b/security/selinux/ss/avtab.c @@ -98,7 +98,7 @@ struct avtab_node * avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datum *datum) { int hvalue; - struct avtab_node *prev, *cur, *newnode; + struct avtab_node *prev, *cur; u16 specified = key->specified & ~(AVTAB_ENABLED|AVTAB_ENABLED_OLD); if (!h || !h->htable) @@ -122,9 +122,7 @@ avtab_insert_nonunique(struct avtab *h, struct avtab_key *key, struct avtab_datu key->target_class < cur->key.target_class) break; } - newnode = avtab_insert_node(h, hvalue, prev, cur, key, datum); - - return newnode; + return avtab_insert_node(h, hvalue, prev, cur, key, datum); } struct avtab_datum *avtab_search(struct avtab *h, struct avtab_key *key) @@ -231,7 +229,7 @@ void avtab_destroy(struct avtab *h) for (i = 0; i < h->nslot; i++) { cur = h->htable[i]; - while (cur != NULL) { + while (cur) { temp = cur; cur = cur->next; kmem_cache_free(avtab_node_cachep, temp); diff --git a/security/selinux/ss/conditional.c b/security/selinux/ss/conditional.c index fb4efe4f4bc..4a4e35cac22 100644 --- a/security/selinux/ss/conditional.c +++ b/security/selinux/ss/conditional.c @@ -29,7 +29,7 @@ static int cond_evaluate_expr(struct policydb *p, struct cond_expr *expr) int s[COND_EXPR_MAXDEPTH]; int sp = -1; - for (cur = expr; cur != NULL; cur = cur->next) { + for (cur = expr; cur; cur = cur->next) { switch (cur->expr_type) { case COND_BOOL: if (sp == (COND_EXPR_MAXDEPTH - 1)) @@ -97,14 +97,14 @@ int evaluate_cond_node(struct policydb *p, struct cond_node *node) if (new_state == -1) printk(KERN_ERR "SELinux: expression result was undefined - disabling all rules.\n"); /* turn the rules on or off */ - for (cur = node->true_list; cur != NULL; cur = cur->next) { + for (cur = node->true_list; cur; cur = cur->next) { if (new_state <= 0) cur->node->key.specified &= ~AVTAB_ENABLED; else cur->node->key.specified |= AVTAB_ENABLED; } - for (cur = node->false_list; cur != NULL; cur = cur->next) { + for (cur = node->false_list; cur; cur = cur->next) { /* -1 or 1 */ if (new_state) cur->node->key.specified &= ~AVTAB_ENABLED; @@ -128,7 +128,7 @@ int cond_policydb_init(struct policydb *p) static void cond_av_list_destroy(struct cond_av_list *list) { struct cond_av_list *cur, *next; - for (cur = list; cur != NULL; cur = next) { + for (cur = list; cur; cur = next) { next = cur->next; /* the avtab_ptr_t node is destroy by the avtab */ kfree(cur); @@ -139,7 +139,7 @@ static void cond_node_destroy(struct cond_node *node) { struct cond_expr *cur_expr, *next_expr; - for (cur_expr = node->expr; cur_expr != NULL; cur_expr = next_expr) { + for (cur_expr = node->expr; cur_expr; cur_expr = next_expr) { next_expr = cur_expr->next; kfree(cur_expr); } @@ -155,7 +155,7 @@ static void cond_list_destroy(struct cond_node *list) if (list == NULL) return; - for (cur = list; cur != NULL; cur = next) { + for (cur = list; cur; cur = next) { next = cur->next; cond_node_destroy(cur); } @@ -239,7 +239,7 @@ int cond_read_bool(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto err; - key[len] = 0; + key[len] = '\0'; if (hashtab_insert(h, key, booldatum)) goto err; @@ -291,7 +291,7 @@ static int cond_insertf(struct avtab *a, struct avtab_key *k, struct avtab_datum goto err; } found = 0; - for (cur = other; cur != NULL; cur = cur->next) { + for (cur = other; cur; cur = cur->next) { if (cur->node == node_ptr) { found = 1; break; @@ -485,7 +485,7 @@ void cond_compute_av(struct avtab *ctab, struct avtab_key *key, struct av_decisi if (!ctab || !key || !avd) return; - for (node = avtab_search_node(ctab, key); node != NULL; + for (node = avtab_search_node(ctab, key); node; node = avtab_search_node_next(node, key->specified)) { if ((u16)(AVTAB_ALLOWED|AVTAB_ENABLED) == (node->key.specified & (AVTAB_ALLOWED|AVTAB_ENABLED))) diff --git a/security/selinux/ss/conditional.h b/security/selinux/ss/conditional.h index 65b9f8366e9..53ddb013ae5 100644 --- a/security/selinux/ss/conditional.h +++ b/security/selinux/ss/conditional.h @@ -28,7 +28,7 @@ struct cond_expr { #define COND_XOR 5 /* bool ^ bool */ #define COND_EQ 6 /* bool == bool */ #define COND_NEQ 7 /* bool != bool */ -#define COND_LAST 8 +#define COND_LAST COND_NEQ __u32 expr_type; __u32 bool; struct cond_expr *next; diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c index ddc275490af..68c7348d1ac 100644 --- a/security/selinux/ss/ebitmap.c +++ b/security/selinux/ss/ebitmap.c @@ -109,7 +109,7 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap, *catmap = c_iter; c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1); - while (e_iter != NULL) { + while (e_iter) { for (i = 0; i < EBITMAP_UNIT_NUMS; i++) { unsigned int delta, e_startbit, c_endbit; @@ -197,7 +197,7 @@ int ebitmap_netlbl_import(struct ebitmap *ebmap, } } c_iter = c_iter->next; - } while (c_iter != NULL); + } while (c_iter); if (e_iter != NULL) ebmap->highbit = e_iter->startbit + EBITMAP_SIZE; else diff --git a/security/selinux/ss/hashtab.c b/security/selinux/ss/hashtab.c index 2e7788e1321..933e735bb18 100644 --- a/security/selinux/ss/hashtab.c +++ b/security/selinux/ss/hashtab.c @@ -81,7 +81,7 @@ void *hashtab_search(struct hashtab *h, const void *key) hvalue = h->hash_value(h, key); cur = h->htable[hvalue]; - while (cur != NULL && h->keycmp(h, key, cur->key) > 0) + while (cur && h->keycmp(h, key, cur->key) > 0) cur = cur->next; if (cur == NULL || (h->keycmp(h, key, cur->key) != 0)) @@ -100,7 +100,7 @@ void hashtab_destroy(struct hashtab *h) for (i = 0; i < h->size; i++) { cur = h->htable[i]; - while (cur != NULL) { + while (cur) { temp = cur; cur = cur->next; kfree(temp); @@ -127,7 +127,7 @@ int hashtab_map(struct hashtab *h, for (i = 0; i < h->size; i++) { cur = h->htable[i]; - while (cur != NULL) { + while (cur) { ret = apply(cur->key, cur->datum, args); if (ret) return ret; diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index 77d745da48b..b5407f16c2a 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -283,8 +283,8 @@ int mls_context_to_sid(struct policydb *pol, p++; delim = *p; - if (delim != 0) - *p++ = 0; + if (delim != '\0') + *p++ = '\0'; for (l = 0; l < 2; l++) { levdatum = hashtab_search(pol->p_levels.table, scontextp); @@ -302,14 +302,14 @@ int mls_context_to_sid(struct policydb *pol, while (*p && *p != ',' && *p != '-') p++; delim = *p; - if (delim != 0) - *p++ = 0; + if (delim != '\0') + *p++ = '\0'; /* Separate into range if exists */ rngptr = strchr(scontextp, '.'); if (rngptr != NULL) { /* Remove '.' */ - *rngptr++ = 0; + *rngptr++ = '\0'; } catdatum = hashtab_search(pol->p_cats.table, @@ -357,8 +357,8 @@ int mls_context_to_sid(struct policydb *pol, p++; delim = *p; - if (delim != 0) - *p++ = 0; + if (delim != '\0') + *p++ = '\0'; } else break; } diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index 2391761ae42..72e4a54973a 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -30,6 +30,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/errno.h> +#include <linux/audit.h> #include "security.h" #include "policydb.h" @@ -116,7 +117,12 @@ static struct policydb_compat_info policydb_compat[] = { .version = POLICYDB_VERSION_PERMISSIVE, .sym_num = SYM_NUM, .ocon_num = OCON_NUM, - } + }, + { + .version = POLICYDB_VERSION_BOUNDARY, + .sym_num = SYM_NUM, + .ocon_num = OCON_NUM, + }, }; static struct policydb_compat_info *policydb_lookup_compat(int version) @@ -254,7 +260,9 @@ static int role_index(void *key, void *datum, void *datap) role = datum; p = datap; - if (!role->value || role->value > p->p_roles.nprim) + if (!role->value + || role->value > p->p_roles.nprim + || role->bounds > p->p_roles.nprim) return -EINVAL; p->p_role_val_to_name[role->value - 1] = key; p->role_val_to_struct[role->value - 1] = role; @@ -270,9 +278,12 @@ static int type_index(void *key, void *datum, void *datap) p = datap; if (typdatum->primary) { - if (!typdatum->value || typdatum->value > p->p_types.nprim) + if (!typdatum->value + || typdatum->value > p->p_types.nprim + || typdatum->bounds > p->p_types.nprim) return -EINVAL; p->p_type_val_to_name[typdatum->value - 1] = key; + p->type_val_to_struct[typdatum->value - 1] = typdatum; } return 0; @@ -285,7 +296,9 @@ static int user_index(void *key, void *datum, void *datap) usrdatum = datum; p = datap; - if (!usrdatum->value || usrdatum->value > p->p_users.nprim) + if (!usrdatum->value + || usrdatum->value > p->p_users.nprim + || usrdatum->bounds > p->p_users.nprim) return -EINVAL; p->p_user_val_to_name[usrdatum->value - 1] = key; p->user_val_to_struct[usrdatum->value - 1] = usrdatum; @@ -438,6 +451,14 @@ static int policydb_index_others(struct policydb *p) goto out; } + p->type_val_to_struct = + kmalloc(p->p_types.nprim * sizeof(*(p->type_val_to_struct)), + GFP_KERNEL); + if (!p->type_val_to_struct) { + rc = -ENOMEM; + goto out; + } + if (cond_init_bool_indexes(p)) { rc = -ENOMEM; goto out; @@ -625,6 +646,7 @@ void policydb_destroy(struct policydb *p) kfree(p->class_val_to_struct); kfree(p->role_val_to_struct); kfree(p->user_val_to_struct); + kfree(p->type_val_to_struct); avtab_destroy(&p->te_avtab); @@ -932,7 +954,7 @@ static int perm_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; rc = hashtab_insert(h, key, perdatum); if (rc) @@ -979,7 +1001,7 @@ static int common_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; for (i = 0; i < nel; i++) { rc = perm_read(p, comdatum->permissions.table, fp); @@ -1117,7 +1139,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; if (len2) { cladatum->comkey = kmalloc(len2 + 1, GFP_KERNEL); @@ -1128,7 +1150,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(cladatum->comkey, fp, len2); if (rc < 0) goto bad; - cladatum->comkey[len2] = 0; + cladatum->comkey[len2] = '\0'; cladatum->comdatum = hashtab_search(p->p_commons.table, cladatum->comkey); @@ -1176,8 +1198,8 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) { char *key = NULL; struct role_datum *role; - int rc; - __le32 buf[2]; + int rc, to_read = 2; + __le32 buf[3]; u32 len; role = kzalloc(sizeof(*role), GFP_KERNEL); @@ -1186,12 +1208,17 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) goto out; } - rc = next_entry(buf, fp, sizeof buf); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) + to_read = 3; + + rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); if (rc < 0) goto bad; len = le32_to_cpu(buf[0]); role->value = le32_to_cpu(buf[1]); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) + role->bounds = le32_to_cpu(buf[2]); key = kmalloc(len + 1, GFP_KERNEL); if (!key) { @@ -1201,7 +1228,7 @@ static int role_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; rc = ebitmap_read(&role->dominates, fp); if (rc) @@ -1236,8 +1263,8 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) { char *key = NULL; struct type_datum *typdatum; - int rc; - __le32 buf[3]; + int rc, to_read = 3; + __le32 buf[4]; u32 len; typdatum = kzalloc(sizeof(*typdatum), GFP_KERNEL); @@ -1246,13 +1273,27 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) return rc; } - rc = next_entry(buf, fp, sizeof buf); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) + to_read = 4; + + rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); if (rc < 0) goto bad; len = le32_to_cpu(buf[0]); typdatum->value = le32_to_cpu(buf[1]); - typdatum->primary = le32_to_cpu(buf[2]); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) { + u32 prop = le32_to_cpu(buf[2]); + + if (prop & TYPEDATUM_PROPERTY_PRIMARY) + typdatum->primary = 1; + if (prop & TYPEDATUM_PROPERTY_ATTRIBUTE) + typdatum->attribute = 1; + + typdatum->bounds = le32_to_cpu(buf[3]); + } else { + typdatum->primary = le32_to_cpu(buf[2]); + } key = kmalloc(len + 1, GFP_KERNEL); if (!key) { @@ -1262,7 +1303,7 @@ static int type_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; rc = hashtab_insert(h, key, typdatum); if (rc) @@ -1309,8 +1350,8 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) { char *key = NULL; struct user_datum *usrdatum; - int rc; - __le32 buf[2]; + int rc, to_read = 2; + __le32 buf[3]; u32 len; usrdatum = kzalloc(sizeof(*usrdatum), GFP_KERNEL); @@ -1319,12 +1360,17 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) goto out; } - rc = next_entry(buf, fp, sizeof buf); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) + to_read = 3; + + rc = next_entry(buf, fp, sizeof(buf[0]) * to_read); if (rc < 0) goto bad; len = le32_to_cpu(buf[0]); usrdatum->value = le32_to_cpu(buf[1]); + if (p->policyvers >= POLICYDB_VERSION_BOUNDARY) + usrdatum->bounds = le32_to_cpu(buf[2]); key = kmalloc(len + 1, GFP_KERNEL); if (!key) { @@ -1334,7 +1380,7 @@ static int user_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; rc = ebitmap_read(&usrdatum->roles, fp); if (rc) @@ -1388,7 +1434,7 @@ static int sens_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; levdatum->level = kmalloc(sizeof(struct mls_level), GFP_ATOMIC); if (!levdatum->level) { @@ -1440,7 +1486,7 @@ static int cat_read(struct policydb *p, struct hashtab *h, void *fp) rc = next_entry(key, fp, len); if (rc < 0) goto bad; - key[len] = 0; + key[len] = '\0'; rc = hashtab_insert(h, key, catdatum); if (rc) @@ -1465,6 +1511,133 @@ static int (*read_f[SYM_NUM]) (struct policydb *p, struct hashtab *h, void *fp) cat_read, }; +static int user_bounds_sanity_check(void *key, void *datum, void *datap) +{ + struct user_datum *upper, *user; + struct policydb *p = datap; + int depth = 0; + + upper = user = datum; + while (upper->bounds) { + struct ebitmap_node *node; + unsigned long bit; + + if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { + printk(KERN_ERR "SELinux: user %s: " + "too deep or looped boundary", + (char *) key); + return -EINVAL; + } + + upper = p->user_val_to_struct[upper->bounds - 1]; + ebitmap_for_each_positive_bit(&user->roles, node, bit) { + if (ebitmap_get_bit(&upper->roles, bit)) + continue; + + printk(KERN_ERR + "SELinux: boundary violated policy: " + "user=%s role=%s bounds=%s\n", + p->p_user_val_to_name[user->value - 1], + p->p_role_val_to_name[bit], + p->p_user_val_to_name[upper->value - 1]); + + return -EINVAL; + } + } + + return 0; +} + +static int role_bounds_sanity_check(void *key, void *datum, void *datap) +{ + struct role_datum *upper, *role; + struct policydb *p = datap; + int depth = 0; + + upper = role = datum; + while (upper->bounds) { + struct ebitmap_node *node; + unsigned long bit; + + if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { + printk(KERN_ERR "SELinux: role %s: " + "too deep or looped bounds\n", + (char *) key); + return -EINVAL; + } + + upper = p->role_val_to_struct[upper->bounds - 1]; + ebitmap_for_each_positive_bit(&role->types, node, bit) { + if (ebitmap_get_bit(&upper->types, bit)) + continue; + + printk(KERN_ERR + "SELinux: boundary violated policy: " + "role=%s type=%s bounds=%s\n", + p->p_role_val_to_name[role->value - 1], + p->p_type_val_to_name[bit], + p->p_role_val_to_name[upper->value - 1]); + + return -EINVAL; + } + } + + return 0; +} + +static int type_bounds_sanity_check(void *key, void *datum, void *datap) +{ + struct type_datum *upper, *type; + struct policydb *p = datap; + int depth = 0; + + upper = type = datum; + while (upper->bounds) { + if (++depth == POLICYDB_BOUNDS_MAXDEPTH) { + printk(KERN_ERR "SELinux: type %s: " + "too deep or looped boundary\n", + (char *) key); + return -EINVAL; + } + + upper = p->type_val_to_struct[upper->bounds - 1]; + if (upper->attribute) { + printk(KERN_ERR "SELinux: type %s: " + "bounded by attribute %s", + (char *) key, + p->p_type_val_to_name[upper->value - 1]); + return -EINVAL; + } + } + + return 0; +} + +static int policydb_bounds_sanity_check(struct policydb *p) +{ + int rc; + + if (p->policyvers < POLICYDB_VERSION_BOUNDARY) + return 0; + + rc = hashtab_map(p->p_users.table, + user_bounds_sanity_check, p); + if (rc) + return rc; + + rc = hashtab_map(p->p_roles.table, + role_bounds_sanity_check, p); + if (rc) + return rc; + + rc = hashtab_map(p->p_types.table, + type_bounds_sanity_check, p); + if (rc) + return rc; + + return 0; +} + extern int ss_initialized; /* @@ -1523,7 +1696,7 @@ int policydb_read(struct policydb *p, void *fp) kfree(policydb_str); goto bad; } - policydb_str[len] = 0; + policydb_str[len] = '\0'; if (strcmp(policydb_str, POLICYDB_STRING)) { printk(KERN_ERR "SELinux: policydb string %s does not match " "my string %s\n", policydb_str, POLICYDB_STRING); @@ -1961,6 +2134,10 @@ int policydb_read(struct policydb *p, void *fp) goto bad; } + rc = policydb_bounds_sanity_check(p); + if (rc) + goto bad; + rc = 0; out: return rc; diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h index 4253370fda6..55152d498b5 100644 --- a/security/selinux/ss/policydb.h +++ b/security/selinux/ss/policydb.h @@ -61,6 +61,7 @@ struct class_datum { /* Role attributes */ struct role_datum { u32 value; /* internal role value */ + u32 bounds; /* boundary of role */ struct ebitmap dominates; /* set of roles dominated by this role */ struct ebitmap types; /* set of authorized types for role */ }; @@ -81,12 +82,15 @@ struct role_allow { /* Type attributes */ struct type_datum { u32 value; /* internal type value */ + u32 bounds; /* boundary of type */ unsigned char primary; /* primary name? */ + unsigned char attribute;/* attribute ?*/ }; /* User attributes */ struct user_datum { u32 value; /* internal user value */ + u32 bounds; /* bounds of user */ struct ebitmap roles; /* set of authorized roles for user */ struct mls_range range; /* MLS range (min - max) for user */ struct mls_level dfltlevel; /* default login MLS level for user */ @@ -209,6 +213,7 @@ struct policydb { struct class_datum **class_val_to_struct; struct role_datum **role_val_to_struct; struct user_datum **user_val_to_struct; + struct type_datum **type_val_to_struct; /* type enforcement access vectors and transitions */ struct avtab te_avtab; diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 8551952ef32..ab0cc0c7b94 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -88,6 +88,11 @@ static u32 latest_granting; static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len); +static int context_struct_compute_av(struct context *scontext, + struct context *tcontext, + u16 tclass, + u32 requested, + struct av_decision *avd); /* * Return the boolean value of a constraint expression * when it is applied to the specified source and target @@ -274,6 +279,100 @@ mls_ops: } /* + * security_boundary_permission - drops violated permissions + * on boundary constraint. + */ +static void type_attribute_bounds_av(struct context *scontext, + struct context *tcontext, + u16 tclass, + u32 requested, + struct av_decision *avd) +{ + struct context lo_scontext; + struct context lo_tcontext; + struct av_decision lo_avd; + struct type_datum *source + = policydb.type_val_to_struct[scontext->type - 1]; + struct type_datum *target + = policydb.type_val_to_struct[tcontext->type - 1]; + u32 masked = 0; + + if (source->bounds) { + memset(&lo_avd, 0, sizeof(lo_avd)); + + memcpy(&lo_scontext, scontext, sizeof(lo_scontext)); + lo_scontext.type = source->bounds; + + context_struct_compute_av(&lo_scontext, + tcontext, + tclass, + requested, + &lo_avd); + if ((lo_avd.allowed & avd->allowed) == avd->allowed) + return; /* no masked permission */ + masked = ~lo_avd.allowed & avd->allowed; + } + + if (target->bounds) { + memset(&lo_avd, 0, sizeof(lo_avd)); + + memcpy(&lo_tcontext, tcontext, sizeof(lo_tcontext)); + lo_tcontext.type = target->bounds; + + context_struct_compute_av(scontext, + &lo_tcontext, + tclass, + requested, + &lo_avd); + if ((lo_avd.allowed & avd->allowed) == avd->allowed) + return; /* no masked permission */ + masked = ~lo_avd.allowed & avd->allowed; + } + + if (source->bounds && target->bounds) { + memset(&lo_avd, 0, sizeof(lo_avd)); + /* + * lo_scontext and lo_tcontext are already + * set up. + */ + + context_struct_compute_av(&lo_scontext, + &lo_tcontext, + tclass, + requested, + &lo_avd); + if ((lo_avd.allowed & avd->allowed) == avd->allowed) + return; /* no masked permission */ + masked = ~lo_avd.allowed & avd->allowed; + } + + if (masked) { + struct audit_buffer *ab; + char *stype_name + = policydb.p_type_val_to_name[source->value - 1]; + char *ttype_name + = policydb.p_type_val_to_name[target->value - 1]; + char *tclass_name + = policydb.p_class_val_to_name[tclass - 1]; + + /* mask violated permissions */ + avd->allowed &= ~masked; + + /* notice to userspace via audit message */ + ab = audit_log_start(current->audit_context, + GFP_ATOMIC, AUDIT_SELINUX_ERR); + if (!ab) + return; + + audit_log_format(ab, "av boundary violation: " + "source=%s target=%s tclass=%s", + stype_name, ttype_name, tclass_name); + avc_dump_av(ab, tclass, masked); + audit_log_end(ab); + } +} + +/* * Compute access vectors based on a context structure pair for * the permissions in a particular class. */ @@ -356,7 +455,7 @@ static int context_struct_compute_av(struct context *scontext, avkey.source_type = i + 1; avkey.target_type = j + 1; for (node = avtab_search_node(&policydb.te_avtab, &avkey); - node != NULL; + node; node = avtab_search_node_next(node, avkey.specified)) { if (node->key.specified == AVTAB_ALLOWED) avd->allowed |= node->datum.data; @@ -404,6 +503,14 @@ static int context_struct_compute_av(struct context *scontext, PROCESS__DYNTRANSITION); } + /* + * If the given source and target types have boundary + * constraint, lazy checks have to mask any violated + * permission and notice it to userspace via audit. + */ + type_attribute_bounds_av(scontext, tcontext, + tclass, requested, avd); + return 0; inval_class: @@ -549,6 +656,69 @@ out: return rc; } +/* + * security_bounded_transition - check whether the given + * transition is directed to bounded, or not. + * It returns 0, if @newsid is bounded by @oldsid. + * Otherwise, it returns error code. + * + * @oldsid : current security identifier + * @newsid : destinated security identifier + */ +int security_bounded_transition(u32 old_sid, u32 new_sid) +{ + struct context *old_context, *new_context; + struct type_datum *type; + int index; + int rc = -EINVAL; + + read_lock(&policy_rwlock); + + old_context = sidtab_search(&sidtab, old_sid); + if (!old_context) { + printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", + __func__, old_sid); + goto out; + } + + new_context = sidtab_search(&sidtab, new_sid); + if (!new_context) { + printk(KERN_ERR "SELinux: %s: unrecognized SID %u\n", + __func__, new_sid); + goto out; + } + + /* type/domain unchaned */ + if (old_context->type == new_context->type) { + rc = 0; + goto out; + } + + index = new_context->type; + while (true) { + type = policydb.type_val_to_struct[index - 1]; + BUG_ON(!type); + + /* not bounded anymore */ + if (!type->bounds) { + rc = -EPERM; + break; + } + + /* @newsid is bounded by @oldsid */ + if (type->bounds == old_context->type) { + rc = 0; + break; + } + index = type->bounds; + } +out: + read_unlock(&policy_rwlock); + + return rc; +} + + /** * security_compute_av - Compute access vector decisions. * @ssid: source security identifier @@ -794,7 +964,7 @@ static int string_to_context_struct(struct policydb *pol, *p++ = 0; typdatum = hashtab_search(pol->p_types.table, scontextp); - if (!typdatum) + if (!typdatum || typdatum->attribute) goto out; ctx->type = typdatum->value; @@ -1037,7 +1207,7 @@ static int security_compute_sid(u32 ssid, /* If no permanent rule, also check for enabled conditional rules */ if (!avdatum) { node = avtab_search_node(&policydb.te_cond_avtab, &avkey); - for (; node != NULL; node = avtab_search_node_next(node, specified)) { + for (; node; node = avtab_search_node_next(node, specified)) { if (node->key.specified & AVTAB_ENABLED) { avdatum = &node->datum; break; @@ -2050,7 +2220,7 @@ int security_set_bools(int len, int *values) policydb.bool_val_to_struct[i]->state = 0; } - for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { + for (cur = policydb.cond_list; cur; cur = cur->next) { rc = evaluate_cond_node(&policydb, cur); if (rc) goto out; @@ -2102,7 +2272,7 @@ static int security_preserve_bools(struct policydb *p) if (booldatum) booldatum->state = bvalues[i]; } - for (cur = p->cond_list; cur != NULL; cur = cur->next) { + for (cur = p->cond_list; cur; cur = cur->next) { rc = evaluate_cond_node(p, cur); if (rc) goto out; diff --git a/security/selinux/ss/sidtab.c b/security/selinux/ss/sidtab.c index a81ded10412..e817989764c 100644 --- a/security/selinux/ss/sidtab.c +++ b/security/selinux/ss/sidtab.c @@ -43,7 +43,7 @@ int sidtab_insert(struct sidtab *s, u32 sid, struct context *context) hvalue = SIDTAB_HASH(sid); prev = NULL; cur = s->htable[hvalue]; - while (cur != NULL && sid > cur->sid) { + while (cur && sid > cur->sid) { prev = cur; cur = cur->next; } @@ -92,7 +92,7 @@ static struct context *sidtab_search_core(struct sidtab *s, u32 sid, int force) hvalue = SIDTAB_HASH(sid); cur = s->htable[hvalue]; - while (cur != NULL && sid > cur->sid) + while (cur && sid > cur->sid) cur = cur->next; if (force && cur && sid == cur->sid && cur->context.len) @@ -103,7 +103,7 @@ static struct context *sidtab_search_core(struct sidtab *s, u32 sid, int force) sid = SECINITSID_UNLABELED; hvalue = SIDTAB_HASH(sid); cur = s->htable[hvalue]; - while (cur != NULL && sid > cur->sid) + while (cur && sid > cur->sid) cur = cur->next; if (!cur || sid != cur->sid) return NULL; @@ -136,7 +136,7 @@ int sidtab_map(struct sidtab *s, for (i = 0; i < SIDTAB_SIZE; i++) { cur = s->htable[i]; - while (cur != NULL) { + while (cur) { rc = apply(cur->sid, &cur->context, args); if (rc) goto out; @@ -155,7 +155,7 @@ static inline u32 sidtab_search_context(struct sidtab *s, for (i = 0; i < SIDTAB_SIZE; i++) { cur = s->htable[i]; - while (cur != NULL) { + while (cur) { if (context_cmp(&cur->context, context)) return cur->sid; cur = cur->next; @@ -242,7 +242,7 @@ void sidtab_destroy(struct sidtab *s) for (i = 0; i < SIDTAB_SIZE; i++) { cur = s->htable[i]; - while (cur != NULL) { + while (cur) { temp = cur; cur = cur->next; context_destroy(&temp->context); diff --git a/security/smack/smack.h b/security/smack/smack.h index 4a4477f5afd..31dce559595 100644 --- a/security/smack/smack.h +++ b/security/smack/smack.h @@ -178,6 +178,7 @@ u32 smack_to_secid(const char *); extern int smack_cipso_direct; extern int smack_net_nltype; extern char *smack_net_ambient; +extern char *smack_onlycap; extern struct smack_known *smack_known; extern struct smack_known smack_known_floor; diff --git a/security/smack/smack_access.c b/security/smack/smack_access.c index f6b5f6eed6d..79ff21ed4c3 100644 --- a/security/smack/smack_access.c +++ b/security/smack/smack_access.c @@ -157,7 +157,7 @@ int smk_access(char *subject_label, char *object_label, int request) * * This function checks the current subject label/object label pair * in the access rule list and returns 0 if the access is permitted, - * non zero otherwise. It allows that current my have the capability + * non zero otherwise. It allows that current may have the capability * to override the rules. */ int smk_curacc(char *obj_label, u32 mode) @@ -168,6 +168,14 @@ int smk_curacc(char *obj_label, u32 mode) if (rc == 0) return 0; + /* + * Return if a specific label has been designated as the + * only one that gets privilege and current does not + * have that label. + */ + if (smack_onlycap != NULL && smack_onlycap != current->security) + return rc; + if (capable(CAP_MAC_OVERRIDE)) return 0; diff --git a/security/smack/smackfs.c b/security/smack/smackfs.c index 271a835fbbe..e7c642458ec 100644 --- a/security/smack/smackfs.c +++ b/security/smack/smackfs.c @@ -39,6 +39,7 @@ enum smk_inos { SMK_DIRECT = 6, /* CIPSO level indicating direct label */ SMK_AMBIENT = 7, /* internet ambient label */ SMK_NLTYPE = 8, /* label scheme to use by default */ + SMK_ONLYCAP = 9, /* the only "capable" label */ }; /* @@ -68,6 +69,16 @@ int smack_net_nltype = NETLBL_NLTYPE_CIPSOV4; */ int smack_cipso_direct = SMACK_CIPSO_DIRECT_DEFAULT; +/* + * Unless a process is running with this label even + * having CAP_MAC_OVERRIDE isn't enough to grant + * privilege to violate MAC policy. If no label is + * designated (the NULL case) capabilities apply to + * everyone. It is expected that the hat (^) label + * will be used if any label is used. + */ +char *smack_onlycap; + static int smk_cipso_doi_value = SMACK_CIPSO_DOI_DEFAULT; struct smk_list_entry *smack_list; @@ -787,6 +798,85 @@ static const struct file_operations smk_ambient_ops = { .write = smk_write_ambient, }; +/** + * smk_read_onlycap - read() for /smack/onlycap + * @filp: file pointer, not actually used + * @buf: where to put the result + * @cn: maximum to send along + * @ppos: where to start + * + * Returns number of bytes read or error code, as appropriate + */ +static ssize_t smk_read_onlycap(struct file *filp, char __user *buf, + size_t cn, loff_t *ppos) +{ + char *smack = ""; + ssize_t rc = -EINVAL; + int asize; + + if (*ppos != 0) + return 0; + + if (smack_onlycap != NULL) + smack = smack_onlycap; + + asize = strlen(smack) + 1; + + if (cn >= asize) + rc = simple_read_from_buffer(buf, cn, ppos, smack, asize); + + return rc; +} + +/** + * smk_write_onlycap - write() for /smack/onlycap + * @filp: file pointer, not actually used + * @buf: where to get the data from + * @count: bytes sent + * @ppos: where to start + * + * Returns number of bytes written or error code, as appropriate + */ +static ssize_t smk_write_onlycap(struct file *file, const char __user *buf, + size_t count, loff_t *ppos) +{ + char in[SMK_LABELLEN]; + char *sp = current->security; + + if (!capable(CAP_MAC_ADMIN)) + return -EPERM; + + /* + * This can be done using smk_access() but is done + * explicitly for clarity. The smk_access() implementation + * would use smk_access(smack_onlycap, MAY_WRITE) + */ + if (smack_onlycap != NULL && smack_onlycap != sp) + return -EPERM; + + if (count >= SMK_LABELLEN) + return -EINVAL; + + if (copy_from_user(in, buf, count) != 0) + return -EFAULT; + + /* + * Should the null string be passed in unset the onlycap value. + * This seems like something to be careful with as usually + * smk_import only expects to return NULL for errors. It + * is usually the case that a nullstring or "\n" would be + * bad to pass to smk_import but in fact this is useful here. + */ + smack_onlycap = smk_import(in, count); + + return count; +} + +static const struct file_operations smk_onlycap_ops = { + .read = smk_read_onlycap, + .write = smk_write_onlycap, +}; + struct option_names { int o_number; char *o_name; @@ -919,6 +1009,8 @@ static int smk_fill_super(struct super_block *sb, void *data, int silent) {"ambient", &smk_ambient_ops, S_IRUGO|S_IWUSR}, [SMK_NLTYPE] = {"nltype", &smk_nltype_ops, S_IRUGO|S_IWUSR}, + [SMK_ONLYCAP] = + {"onlycap", &smk_onlycap_ops, S_IRUGO|S_IWUSR}, /* last one */ {""} }; |