diff options
Diffstat (limited to 'security/selinux/ss')
| -rw-r--r-- | security/selinux/ss/ebitmap.c | 198 | ||||
| -rw-r--r-- | security/selinux/ss/ebitmap.h | 26 | ||||
| -rw-r--r-- | security/selinux/ss/hashtab.c | 6 | ||||
| -rw-r--r-- | security/selinux/ss/hashtab.h | 10 | ||||
| -rw-r--r-- | security/selinux/ss/mls.c | 156 | ||||
| -rw-r--r-- | security/selinux/ss/mls.h | 46 | ||||
| -rw-r--r-- | security/selinux/ss/policydb.c | 6 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 437 | ||||
| -rw-r--r-- | security/selinux/ss/symtab.c | 8 |
9 files changed, 443 insertions, 450 deletions
diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c index d539346ab3a..ce492a6b38e 100644 --- a/security/selinux/ss/ebitmap.c +++ b/security/selinux/ss/ebitmap.c @@ -6,7 +6,7 @@ /* * Updated: Hewlett-Packard <paul.moore@hp.com> * - * Added ebitmap_export() and ebitmap_import() + * Added support to import/export the NetLabel category bitmap * * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 */ @@ -14,6 +14,7 @@ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/errno.h> +#include <net/netlabel.h> #include "ebitmap.h" #include "policydb.h" @@ -67,141 +68,120 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src) return 0; } +#ifdef CONFIG_NETLABEL /** - * ebitmap_export - Export an ebitmap to a unsigned char bitmap string - * @src: the ebitmap to export - * @dst: the resulting bitmap string - * @dst_len: length of dst in bytes + * ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap + * @ebmap: the ebitmap to export + * @catmap: the NetLabel category bitmap * * Description: - * Allocate a buffer at least src->highbit bits long and export the extensible - * bitmap into the buffer. The bitmap string will be in little endian format, - * i.e. LSB first. The value returned in dst_len may not the true size of the - * buffer as the length of the buffer is rounded up to a multiple of MAPTYPE. - * The caller must free the buffer when finished. Returns zero on success, - * negative values on failure. + * Export a SELinux extensibile bitmap into a NetLabel category bitmap. + * Returns zero on success, negative values on error. * */ -int ebitmap_export(const struct ebitmap *src, - unsigned char **dst, - size_t *dst_len) +int ebitmap_netlbl_export(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap **catmap) { - size_t bitmap_len; - unsigned char *bitmap; - struct ebitmap_node *iter_node; - MAPTYPE node_val; - size_t bitmap_byte; - unsigned char bitmask; - - if (src->highbit == 0) { - *dst = NULL; - *dst_len = 0; + struct ebitmap_node *e_iter = ebmap->node; + struct netlbl_lsm_secattr_catmap *c_iter; + u32 cmap_idx; + + /* This function is a much simpler because SELinux's MAPTYPE happens + * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is + * changed from a u64 this function will most likely need to be changed + * as well. It's not ideal but I think the tradeoff in terms of + * neatness and speed is worth it. */ + + if (e_iter == NULL) { + *catmap = NULL; return 0; } - bitmap_len = src->highbit / 8; - if (src->highbit % 7) - bitmap_len += 1; - - bitmap = kzalloc((bitmap_len & ~(sizeof(MAPTYPE) - 1)) + - sizeof(MAPTYPE), - GFP_ATOMIC); - if (bitmap == NULL) + c_iter = netlbl_secattr_catmap_alloc(GFP_ATOMIC); + if (c_iter == NULL) return -ENOMEM; + *catmap = c_iter; + c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1); + + while (e_iter != NULL) { + if (e_iter->startbit >= + (c_iter->startbit + NETLBL_CATMAP_SIZE)) { + c_iter->next = netlbl_secattr_catmap_alloc(GFP_ATOMIC); + if (c_iter->next == NULL) + goto netlbl_export_failure; + c_iter = c_iter->next; + c_iter->startbit = e_iter->startbit & + ~(NETLBL_CATMAP_SIZE - 1); + } + cmap_idx = (e_iter->startbit - c_iter->startbit) / + NETLBL_CATMAP_MAPSIZE; + c_iter->bitmap[cmap_idx] = e_iter->map; + e_iter = e_iter->next; + } - iter_node = src->node; - do { - bitmap_byte = iter_node->startbit / 8; - bitmask = 0x80; - node_val = iter_node->map; - do { - if (bitmask == 0) { - bitmap_byte++; - bitmask = 0x80; - } - if (node_val & (MAPTYPE)0x01) - bitmap[bitmap_byte] |= bitmask; - node_val >>= 1; - bitmask >>= 1; - } while (node_val > 0); - iter_node = iter_node->next; - } while (iter_node); - - *dst = bitmap; - *dst_len = bitmap_len; return 0; + +netlbl_export_failure: + netlbl_secattr_catmap_free(*catmap); + return -ENOMEM; } /** - * ebitmap_import - Import an unsigned char bitmap string into an ebitmap - * @src: the bitmap string - * @src_len: the bitmap length in bytes - * @dst: the empty ebitmap + * ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap + * @ebmap: the ebitmap to export + * @catmap: the NetLabel category bitmap * * Description: - * This function takes a little endian bitmap string in src and imports it into - * the ebitmap pointed to by dst. Returns zero on success, negative values on - * failure. + * Import a NetLabel category bitmap into a SELinux extensibile bitmap. + * Returns zero on success, negative values on error. * */ -int ebitmap_import(const unsigned char *src, - size_t src_len, - struct ebitmap *dst) +int ebitmap_netlbl_import(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap *catmap) { - size_t src_off = 0; - size_t node_limit; - struct ebitmap_node *node_new; - struct ebitmap_node *node_last = NULL; - u32 i_byte; - u32 i_bit; - unsigned char src_byte; - - while (src_off < src_len) { - if (src_len - src_off >= sizeof(MAPTYPE)) { - if (*(MAPTYPE *)&src[src_off] == 0) { - src_off += sizeof(MAPTYPE); - continue; - } - node_limit = sizeof(MAPTYPE); - } else { - for (src_byte = 0, i_byte = src_off; - i_byte < src_len && src_byte == 0; - i_byte++) - src_byte |= src[i_byte]; - if (src_byte == 0) - break; - node_limit = src_len - src_off; - } + struct ebitmap_node *e_iter = NULL; + struct ebitmap_node *emap_prev = NULL; + struct netlbl_lsm_secattr_catmap *c_iter = catmap; + u32 c_idx; - node_new = kzalloc(sizeof(*node_new), GFP_ATOMIC); - if (unlikely(node_new == NULL)) { - ebitmap_destroy(dst); - return -ENOMEM; - } - node_new->startbit = src_off * 8; - for (i_byte = 0; i_byte < node_limit; i_byte++) { - src_byte = src[src_off++]; - for (i_bit = i_byte * 8; src_byte != 0; i_bit++) { - if (src_byte & 0x80) - node_new->map |= MAPBIT << i_bit; - src_byte <<= 1; - } - } + /* This function is a much simpler because SELinux's MAPTYPE happens + * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is + * changed from a u64 this function will most likely need to be changed + * as well. It's not ideal but I think the tradeoff in terms of + * neatness and speed is worth it. */ - if (node_last != NULL) - node_last->next = node_new; - else - dst->node = node_new; - node_last = node_new; - } + do { + for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) { + if (c_iter->bitmap[c_idx] == 0) + continue; + + e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC); + if (e_iter == NULL) + goto netlbl_import_failure; + if (emap_prev == NULL) + ebmap->node = e_iter; + else + emap_prev->next = e_iter; + emap_prev = e_iter; - if (likely(node_last != NULL)) - dst->highbit = node_last->startbit + MAPSIZE; + e_iter->startbit = c_iter->startbit + + NETLBL_CATMAP_MAPSIZE * c_idx; + e_iter->map = c_iter->bitmap[c_idx]; + } + c_iter = c_iter->next; + } while (c_iter != NULL); + if (e_iter != NULL) + ebmap->highbit = e_iter->startbit + MAPSIZE; else - ebitmap_init(dst); + ebitmap_destroy(ebmap); return 0; + +netlbl_import_failure: + ebitmap_destroy(ebmap); + return -ENOMEM; } +#endif /* CONFIG_NETLABEL */ int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2) { diff --git a/security/selinux/ss/ebitmap.h b/security/selinux/ss/ebitmap.h index da2d4651b10..1270e34b61c 100644 --- a/security/selinux/ss/ebitmap.h +++ b/security/selinux/ss/ebitmap.h @@ -14,6 +14,8 @@ #ifndef _SS_EBITMAP_H_ #define _SS_EBITMAP_H_ +#include <net/netlabel.h> + #define MAPTYPE u64 /* portion of bitmap in each node */ #define MAPSIZE (sizeof(MAPTYPE) * 8) /* number of bits in node bitmap */ #define MAPBIT 1ULL /* a bit in the node bitmap */ @@ -69,16 +71,28 @@ static inline int ebitmap_node_get_bit(struct ebitmap_node * n, int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2); int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src); -int ebitmap_export(const struct ebitmap *src, - unsigned char **dst, - size_t *dst_len); -int ebitmap_import(const unsigned char *src, - size_t src_len, - struct ebitmap *dst); int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2); int ebitmap_get_bit(struct ebitmap *e, unsigned long bit); int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value); void ebitmap_destroy(struct ebitmap *e); int ebitmap_read(struct ebitmap *e, void *fp); +#ifdef CONFIG_NETLABEL +int ebitmap_netlbl_export(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap **catmap); +int ebitmap_netlbl_import(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap *catmap); +#else +static inline int ebitmap_netlbl_export(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap **catmap) +{ + return -ENOMEM; +} +static inline int ebitmap_netlbl_import(struct ebitmap *ebmap, + struct netlbl_lsm_secattr_catmap *catmap) +{ + return -ENOMEM; +} +#endif + #endif /* _SS_EBITMAP_H_ */ diff --git a/security/selinux/ss/hashtab.c b/security/selinux/ss/hashtab.c index 24e5ec95763..77b530c3bbc 100644 --- a/security/selinux/ss/hashtab.c +++ b/security/selinux/ss/hashtab.c @@ -8,8 +8,8 @@ #include <linux/errno.h> #include "hashtab.h" -struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, void *key), - int (*keycmp)(struct hashtab *h, void *key1, void *key2), +struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void *key), + int (*keycmp)(struct hashtab *h, const void *key1, const void *key2), u32 size) { struct hashtab *p; @@ -71,7 +71,7 @@ int hashtab_insert(struct hashtab *h, void *key, void *datum) return 0; } -void *hashtab_search(struct hashtab *h, void *key) +void *hashtab_search(struct hashtab *h, const void *key) { u32 hvalue; struct hashtab_node *cur; diff --git a/security/selinux/ss/hashtab.h b/security/selinux/ss/hashtab.h index 4cc85816a71..7e2ff3e3c6d 100644 --- a/security/selinux/ss/hashtab.h +++ b/security/selinux/ss/hashtab.h @@ -22,9 +22,9 @@ struct hashtab { struct hashtab_node **htable; /* hash table */ u32 size; /* number of slots in hash table */ u32 nel; /* number of elements in hash table */ - u32 (*hash_value)(struct hashtab *h, void *key); + u32 (*hash_value)(struct hashtab *h, const void *key); /* hash function */ - int (*keycmp)(struct hashtab *h, void *key1, void *key2); + int (*keycmp)(struct hashtab *h, const void *key1, const void *key2); /* key comparison function */ }; @@ -39,8 +39,8 @@ struct hashtab_info { * Returns NULL if insufficent space is available or * the new hash table otherwise. */ -struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, void *key), - int (*keycmp)(struct hashtab *h, void *key1, void *key2), +struct hashtab *hashtab_create(u32 (*hash_value)(struct hashtab *h, const void *key), + int (*keycmp)(struct hashtab *h, const void *key1, const void *key2), u32 size); /* @@ -59,7 +59,7 @@ int hashtab_insert(struct hashtab *h, void *k, void *d); * Returns NULL if no entry has the specified key or * the datum of the entry otherwise. */ -void *hashtab_search(struct hashtab *h, void *k); +void *hashtab_search(struct hashtab *h, const void *k); /* * Destroys the specified hash table. diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c index 2cca8e25162..b4f682dc13f 100644 --- a/security/selinux/ss/mls.c +++ b/security/selinux/ss/mls.c @@ -13,7 +13,7 @@ /* * Updated: Hewlett-Packard <paul.moore@hp.com> * - * Added support to import/export the MLS label + * Added support to import/export the MLS label from NetLabel * * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 */ @@ -22,6 +22,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/errno.h> +#include <net/netlabel.h> #include "sidtab.h" #include "mls.h" #include "policydb.h" @@ -571,163 +572,108 @@ int mls_compute_sid(struct context *scontext, return -EINVAL; } +#ifdef CONFIG_NETLABEL /** - * mls_export_lvl - Export the MLS sensitivity levels + * mls_export_netlbl_lvl - Export the MLS sensitivity levels to NetLabel * @context: the security context - * @low: the low sensitivity level - * @high: the high sensitivity level + * @secattr: the NetLabel security attributes * * Description: - * Given the security context copy the low MLS sensitivity level into lvl_low - * and the high sensitivity level in lvl_high. The MLS levels are only - * exported if the pointers are not NULL, if they are NULL then that level is - * not exported. + * Given the security context copy the low MLS sensitivity level into the + * NetLabel MLS sensitivity level field. * */ -void mls_export_lvl(const struct context *context, u32 *low, u32 *high) +void mls_export_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr) { if (!selinux_mls_enabled) return; - if (low != NULL) - *low = context->range.level[0].sens - 1; - if (high != NULL) - *high = context->range.level[1].sens - 1; + secattr->mls_lvl = context->range.level[0].sens - 1; + secattr->flags |= NETLBL_SECATTR_MLS_LVL; } /** - * mls_import_lvl - Import the MLS sensitivity levels + * mls_import_netlbl_lvl - Import the NetLabel MLS sensitivity levels * @context: the security context - * @low: the low sensitivity level - * @high: the high sensitivity level + * @secattr: the NetLabel security attributes * * Description: - * Given the security context and the two sensitivty levels, set the MLS levels - * in the context according the two given as parameters. Returns zero on - * success, negative values on failure. + * Given the security context and the NetLabel security attributes, copy the + * NetLabel MLS sensitivity level into the context. * */ -void mls_import_lvl(struct context *context, u32 low, u32 high) +void mls_import_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr) { if (!selinux_mls_enabled) return; - context->range.level[0].sens = low + 1; - context->range.level[1].sens = high + 1; + context->range.level[0].sens = secattr->mls_lvl + 1; + context->range.level[1].sens = context->range.level[0].sens; } /** - * mls_export_cat - Export the MLS categories + * mls_export_netlbl_cat - Export the MLS categories to NetLabel * @context: the security context - * @low: the low category - * @low_len: length of the cat_low bitmap in bytes - * @high: the high category - * @high_len: length of the cat_high bitmap in bytes + * @secattr: the NetLabel security attributes * * Description: - * Given the security context export the low MLS category bitmap into cat_low - * and the high category bitmap into cat_high. The MLS categories are only - * exported if the pointers are not NULL, if they are NULL then that level is - * not exported. The caller is responsibile for freeing the memory when - * finished. Returns zero on success, negative values on failure. + * Given the security context copy the low MLS categories into the NetLabel + * MLS category field. Returns zero on success, negative values on failure. * */ -int mls_export_cat(const struct context *context, - unsigned char **low, - size_t *low_len, - unsigned char **high, - size_t *high_len) +int mls_export_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr) { - int rc = -EPERM; + int rc; - if (!selinux_mls_enabled) { - *low = NULL; - *low_len = 0; - *high = NULL; - *high_len = 0; + if (!selinux_mls_enabled) return 0; - } - if (low != NULL) { - rc = ebitmap_export(&context->range.level[0].cat, - low, - low_len); - if (rc != 0) - goto export_cat_failure; - } - if (high != NULL) { - rc = ebitmap_export(&context->range.level[1].cat, - high, - high_len); - if (rc != 0) - goto export_cat_failure; - } - - return 0; + rc = ebitmap_netlbl_export(&context->range.level[0].cat, + &secattr->mls_cat); + if (rc == 0 && secattr->mls_cat != NULL) + secattr->flags |= NETLBL_SECATTR_MLS_CAT; -export_cat_failure: - if (low != NULL) { - kfree(*low); - *low = NULL; - *low_len = 0; - } - if (high != NULL) { - kfree(*high); - *high = NULL; - *high_len = 0; - } return rc; } /** - * mls_import_cat - Import the MLS categories + * mls_import_netlbl_cat - Import the MLS categories from NetLabel * @context: the security context - * @low: the low category - * @low_len: length of the cat_low bitmap in bytes - * @high: the high category - * @high_len: length of the cat_high bitmap in bytes + * @secattr: the NetLabel security attributes * * Description: - * Given the security context and the two category bitmap strings import the - * categories into the security context. The MLS categories are only imported - * if the pointers are not NULL, if they are NULL they are skipped. Returns - * zero on success, negative values on failure. + * Copy the NetLabel security attributes into the SELinux context; since the + * NetLabel security attribute only contains a single MLS category use it for + * both the low and high categories of the context. Returns zero on success, + * negative values on failure. * */ -int mls_import_cat(struct context *context, - const unsigned char *low, - size_t low_len, - const unsigned char *high, - size_t high_len) +int mls_import_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr) { - int rc = -EPERM; + int rc; if (!selinux_mls_enabled) return 0; - if (low != NULL) { - rc = ebitmap_import(low, - low_len, - &context->range.level[0].cat); - if (rc != 0) - goto import_cat_failure; - } - if (high != NULL) { - if (high == low) - rc = ebitmap_cpy(&context->range.level[1].cat, - &context->range.level[0].cat); - else - rc = ebitmap_import(high, - high_len, - &context->range.level[1].cat); - if (rc != 0) - goto import_cat_failure; - } + rc = ebitmap_netlbl_import(&context->range.level[0].cat, + secattr->mls_cat); + if (rc != 0) + goto import_netlbl_cat_failure; + + rc = ebitmap_cpy(&context->range.level[1].cat, + &context->range.level[0].cat); + if (rc != 0) + goto import_netlbl_cat_failure; return 0; -import_cat_failure: +import_netlbl_cat_failure: ebitmap_destroy(&context->range.level[0].cat); ebitmap_destroy(&context->range.level[1].cat); return rc; } +#endif /* CONFIG_NETLABEL */ diff --git a/security/selinux/ss/mls.h b/security/selinux/ss/mls.h index df6032c6d49..661d6fc7696 100644 --- a/security/selinux/ss/mls.h +++ b/security/selinux/ss/mls.h @@ -13,7 +13,7 @@ /* * Updated: Hewlett-Packard <paul.moore@hp.com> * - * Added support to import/export the MLS label + * Added support to import/export the MLS label from NetLabel * * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 */ @@ -69,19 +69,37 @@ int mls_compute_sid(struct context *scontext, int mls_setup_user_range(struct context *fromcon, struct user_datum *user, struct context *usercon); -void mls_export_lvl(const struct context *context, u32 *low, u32 *high); -void mls_import_lvl(struct context *context, u32 low, u32 high); - -int mls_export_cat(const struct context *context, - unsigned char **low, - size_t *low_len, - unsigned char **high, - size_t *high_len); -int mls_import_cat(struct context *context, - const unsigned char *low, - size_t low_len, - const unsigned char *high, - size_t high_len); +#ifdef CONFIG_NETLABEL +void mls_export_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr); +void mls_import_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr); +int mls_export_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr); +int mls_import_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr); +#else +static inline void mls_export_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr) +{ + return; +} +static inline void mls_import_netlbl_lvl(struct context *context, + struct netlbl_lsm_secattr *secattr) +{ + return; +} +static inline int mls_export_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr) +{ + return -ENOMEM; +} +static inline int mls_import_netlbl_cat(struct context *context, + struct netlbl_lsm_secattr *secattr) +{ + return -ENOMEM; +} +#endif #endif /* _SS_MLS_H */ diff --git a/security/selinux/ss/policydb.c b/security/selinux/ss/policydb.c index ba48961f9d0..cd79c6338aa 100644 --- a/security/selinux/ss/policydb.c +++ b/security/selinux/ss/policydb.c @@ -468,7 +468,7 @@ static int common_destroy(void *key, void *datum, void *p) return 0; } -static int class_destroy(void *key, void *datum, void *p) +static int cls_destroy(void *key, void *datum, void *p) { struct class_datum *cladatum; struct constraint_node *constraint, *ctemp; @@ -566,7 +566,7 @@ static int cat_destroy(void *key, void *datum, void *p) static int (*destroy_f[SYM_NUM]) (void *key, void *datum, void *datap) = { common_destroy, - class_destroy, + cls_destroy, role_destroy, type_destroy, user_destroy, @@ -1124,7 +1124,7 @@ static int class_read(struct policydb *p, struct hashtab *h, void *fp) out: return rc; bad: - class_destroy(key, cladatum, NULL); + cls_destroy(key, cladatum, NULL); goto out; } diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index bfe122764c9..bdb7070dd3d 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -17,9 +17,13 @@ * * Added support for NetLabel * + * Updated: Chad Sellers <csellers@tresys.com> + * + * Added validation of kernel classes and permissions + * * Copyright (C) 2006 Hewlett-Packard Development Company, L.P. * Copyright (C) 2004-2006 Trusted Computer Solutions, Inc. - * Copyright (C) 2003 - 2004 Tresys Technology, LLC + * Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> * 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 @@ -29,6 +33,7 @@ #include <linux/slab.h> #include <linux/string.h> #include <linux/spinlock.h> +#include <linux/rcupdate.h> #include <linux/errno.h> #include <linux/in.h> #include <linux/sched.h> @@ -49,10 +54,17 @@ #include "mls.h" #include "objsec.h" #include "selinux_netlabel.h" +#include "xfrm.h" +#include "ebitmap.h" extern void selnl_notify_policyload(u32 seqno); unsigned int policydb_loaded_version; +/* + * This is declared in avc.c + */ +extern const struct selinux_class_perm selinux_class_perm; + static DEFINE_RWLOCK(policy_rwlock); #define POLICY_RDLOCK read_lock(&policy_rwlock) #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) @@ -1019,86 +1031,112 @@ int security_change_sid(u32 ssid, } /* - * Verify that each permission that is defined under the - * existing policy is still defined with the same value - * in the new policy. - */ -static int validate_perm(void *key, void *datum, void *p) -{ - struct hashtab *h; - struct perm_datum *perdatum, *perdatum2; - int rc = 0; - - - h = p; - perdatum = datum; - - perdatum2 = hashtab_search(h, key); - if (!perdatum2) { - printk(KERN_ERR "security: permission %s disappeared", - (char *)key); - rc = -ENOENT; - goto out; - } - if (perdatum->value != perdatum2->value) { - printk(KERN_ERR "security: the value of permission %s changed", - (char *)key); - rc = -EINVAL; - } -out: - return rc; -} - -/* - * Verify that each class that is defined under the - * existing policy is still defined with the same - * attributes in the new policy. + * Verify that each kernel class that is defined in the + * policy is correct */ -static int validate_class(void *key, void *datum, void *p) +static int validate_classes(struct policydb *p) { - struct policydb *newp; - struct class_datum *cladatum, *cladatum2; - int rc; - - newp = p; - cladatum = datum; - - cladatum2 = hashtab_search(newp->p_classes.table, key); - if (!cladatum2) { - printk(KERN_ERR "security: class %s disappeared\n", - (char *)key); - rc = -ENOENT; - goto out; - } - if (cladatum->value != cladatum2->value) { - printk(KERN_ERR "security: the value of class %s changed\n", - (char *)key); - rc = -EINVAL; - goto out; + int i, j; + struct class_datum *cladatum; + struct perm_datum *perdatum; + u32 nprim, tmp, common_pts_len, perm_val, pol_val; + u16 class_val; + const struct selinux_class_perm *kdefs = &selinux_class_perm; + const char *def_class, *def_perm, *pol_class; + struct symtab *perms; + + for (i = 1; i < kdefs->cts_len; i++) { + def_class = kdefs->class_to_string[i]; + if (i > p->p_classes.nprim) { + printk(KERN_INFO + "security: class %s not defined in policy\n", + def_class); + continue; + } + pol_class = p->p_class_val_to_name[i-1]; + if (strcmp(pol_class, def_class)) { + printk(KERN_ERR + "security: class %d is incorrect, found %s but should be %s\n", + i, pol_class, def_class); + return -EINVAL; + } } - if ((cladatum->comdatum && !cladatum2->comdatum) || - (!cladatum->comdatum && cladatum2->comdatum)) { - printk(KERN_ERR "security: the inherits clause for the access " - "vector definition for class %s changed\n", (char *)key); - rc = -EINVAL; - goto out; + for (i = 0; i < kdefs->av_pts_len; i++) { + class_val = kdefs->av_perm_to_string[i].tclass; + perm_val = kdefs->av_perm_to_string[i].value; + def_perm = kdefs->av_perm_to_string[i].name; + if (class_val > p->p_classes.nprim) + continue; + pol_class = p->p_class_val_to_name[class_val-1]; + cladatum = hashtab_search(p->p_classes.table, pol_class); + BUG_ON(!cladatum); + perms = &cladatum->permissions; + nprim = 1 << (perms->nprim - 1); + if (perm_val > nprim) { + printk(KERN_INFO + "security: permission %s in class %s not defined in policy\n", + def_perm, pol_class); + continue; + } + perdatum = hashtab_search(perms->table, def_perm); + if (perdatum == NULL) { + printk(KERN_ERR + "security: permission %s in class %s not found in policy\n", + def_perm, pol_class); + return -EINVAL; + } + pol_val = 1 << (perdatum->value - 1); + if (pol_val != perm_val) { + printk(KERN_ERR + "security: permission %s in class %s has incorrect value\n", + def_perm, pol_class); + return -EINVAL; + } } - if (cladatum->comdatum) { - rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm, - cladatum2->comdatum->permissions.table); - if (rc) { - printk(" in the access vector definition for class " - "%s\n", (char *)key); - goto out; + for (i = 0; i < kdefs->av_inherit_len; i++) { + class_val = kdefs->av_inherit[i].tclass; + if (class_val > p->p_classes.nprim) + continue; + pol_class = p->p_class_val_to_name[class_val-1]; + cladatum = hashtab_search(p->p_classes.table, pol_class); + BUG_ON(!cladatum); + if (!cladatum->comdatum) { + printk(KERN_ERR + "security: class %s should have an inherits clause but does not\n", + pol_class); + return -EINVAL; + } + tmp = kdefs->av_inherit[i].common_base; + common_pts_len = 0; + while (!(tmp & 0x01)) { + common_pts_len++; + tmp >>= 1; + } + perms = &cladatum->comdatum->permissions; + for (j = 0; j < common_pts_len; j++) { + def_perm = kdefs->av_inherit[i].common_pts[j]; + if (j >= perms->nprim) { + printk(KERN_INFO + "security: permission %s in class %s not defined in policy\n", + def_perm, pol_class); + continue; + } + perdatum = hashtab_search(perms->table, def_perm); + if (perdatum == NULL) { + printk(KERN_ERR + "security: permission %s in class %s not found in policy\n", + def_perm, pol_class); + return -EINVAL; + } + if (perdatum->value != j + 1) { + printk(KERN_ERR + "security: permission %s in class %s has incorrect value\n", + def_perm, pol_class); + return -EINVAL; + } } } - rc = hashtab_map(cladatum->permissions.table, validate_perm, - cladatum2->permissions.table); - if (rc) - printk(" in access vector definition for class %s\n", - (char *)key); -out: - return rc; + return 0; } /* Clone the SID into the new SID table. */ @@ -1243,6 +1281,16 @@ int security_load_policy(void *data, size_t len) avtab_cache_destroy(); return -EINVAL; } + /* Verify that the kernel defined classes are correct. */ + if (validate_classes(&policydb)) { + printk(KERN_ERR + "security: the definition of a class is incorrect\n"); + LOAD_UNLOCK; + sidtab_destroy(&sidtab); + policydb_destroy(&policydb); + avtab_cache_destroy(); + return -EINVAL; + } policydb_loaded_version = policydb.policyvers; ss_initialized = 1; seqno = ++latest_granting; @@ -1265,10 +1313,10 @@ int security_load_policy(void *data, size_t len) sidtab_init(&newsidtab); - /* Verify that the existing classes did not change. */ - if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) { - printk(KERN_ERR "security: the definition of an existing " - "class changed\n"); + /* Verify that the kernel defined classes are correct. */ + if (validate_classes(&newpolicydb)) { + printk(KERN_ERR + "security: the definition of a class is incorrect\n"); rc = -EINVAL; goto err; } @@ -2145,6 +2193,32 @@ void selinux_audit_set_callback(int (*callback)(void)) aurule_callback = callback; } +/** + * security_skb_extlbl_sid - Determine the external label of a packet + * @skb: the packet + * @base_sid: the SELinux SID to use as a context for MLS only external labels + * @sid: the packet's SID + * + * Description: + * Check the various different forms of external packet labeling and determine + * the external SID for the packet. + * + */ +void security_skb_extlbl_sid(struct sk_buff *skb, u32 base_sid, u32 *sid) +{ + u32 xfrm_sid; + u32 nlbl_sid; + + selinux_skb_xfrm_sid(skb, &xfrm_sid); + if (selinux_netlbl_skbuff_getsid(skb, + (xfrm_sid == SECSID_NULL ? + base_sid : xfrm_sid), + &nlbl_sid) != 0) + nlbl_sid = SECSID_NULL; + + *sid = (nlbl_sid == SECSID_NULL ? xfrm_sid : nlbl_sid); +} + #ifdef CONFIG_NETLABEL /* * This is the structure we store inside the NetLabel cache block. @@ -2209,8 +2283,6 @@ static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) cache = kzalloc(sizeof(*cache), GFP_ATOMIC); if (cache == NULL) goto netlbl_cache_add_return; - secattr.cache->free = selinux_netlbl_cache_free; - secattr.cache->data = (void *)cache; cache->type = NETLBL_CACHE_T_MLS; if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, @@ -2223,6 +2295,10 @@ static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; + secattr.cache->free = selinux_netlbl_cache_free; + secattr.cache->data = (void *)cache; + secattr.flags = NETLBL_SECATTR_CACHE; + netlbl_cache_add(skb, &secattr); netlbl_cache_add_return: @@ -2268,7 +2344,7 @@ static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, POLICY_RDLOCK; - if (secattr->cache) { + if (secattr->flags & NETLBL_SECATTR_CACHE) { cache = NETLBL_CACHE(secattr->cache->data); switch (cache->type) { case NETLBL_CACHE_T_SID: @@ -2301,7 +2377,7 @@ static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, default: goto netlbl_secattr_to_sid_return; } - } else if (secattr->mls_lvl_vld) { + } else if (secattr->flags & NETLBL_SECATTR_MLS_LVL) { ctx = sidtab_search(&sidtab, base_sid); if (ctx == NULL) goto netlbl_secattr_to_sid_return; @@ -2309,13 +2385,10 @@ static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, ctx_new.user = ctx->user; ctx_new.role = ctx->role; ctx_new.type = ctx->type; - mls_import_lvl(&ctx_new, secattr->mls_lvl, secattr->mls_lvl); - if (secattr->mls_cat) { - if (mls_import_cat(&ctx_new, - secattr->mls_cat, - secattr->mls_cat_len, - NULL, - 0) != 0) + mls_import_netlbl_lvl(&ctx_new, secattr); + if (secattr->flags & NETLBL_SECATTR_MLS_CAT) { + if (ebitmap_netlbl_import(&ctx_new.range.level[0].cat, + secattr->mls_cat) != 0) goto netlbl_secattr_to_sid_return; ctx_new.range.level[1].cat.highbit = ctx_new.range.level[0].cat.highbit; @@ -2360,20 +2433,20 @@ netlbl_secattr_to_sid_return_cleanup: * assign to the packet. Returns zero on success, negative values on failure. * */ -static int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, - u32 base_sid, - u32 *sid) +int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid) { int rc; struct netlbl_lsm_secattr secattr; netlbl_secattr_init(&secattr); rc = netlbl_skbuff_getattr(skb, &secattr); - if (rc == 0) + if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) rc = selinux_netlbl_secattr_to_sid(skb, &secattr, base_sid, sid); + else + *sid = SECSID_NULL; netlbl_secattr_destroy(&secattr); return rc; @@ -2386,7 +2459,9 @@ static int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, * * Description: * Attempt to label a socket using the NetLabel mechanism using the given - * SID. Returns zero values on success, negative values on failure. + * SID. Returns zero values on success, negative values on failure. The + * caller is responsibile for calling rcu_read_lock() before calling this + * this function and rcu_read_unlock() after this function returns. * */ static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) @@ -2409,19 +2484,18 @@ static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], GFP_ATOMIC); - mls_export_lvl(ctx, &secattr.mls_lvl, NULL); - secattr.mls_lvl_vld = 1; - rc = mls_export_cat(ctx, - &secattr.mls_cat, - &secattr.mls_cat_len, - NULL, - NULL); + secattr.flags |= NETLBL_SECATTR_DOMAIN; + mls_export_netlbl_lvl(ctx, &secattr); + rc = mls_export_netlbl_cat(ctx, &secattr); if (rc != 0) goto netlbl_socket_setsid_return; rc = netlbl_socket_setattr(sock, &secattr); - if (rc == 0) + if (rc == 0) { + spin_lock(&sksec->nlbl_lock); sksec->nlbl_state = NLBL_LABELED; + spin_unlock(&sksec->nlbl_lock); + } netlbl_socket_setsid_return: POLICY_RDUNLOCK; @@ -2430,6 +2504,25 @@ netlbl_socket_setsid_return: } /** + * selinux_netlbl_sk_security_reset - Reset the NetLabel fields + * @ssec: the sk_security_struct + * @family: the socket family + * + * Description: + * Called when the NetLabel state of a sk_security_struct needs to be reset. + * The caller is responsibile for all the NetLabel sk_security_struct locking. + * + */ +void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, + int family) +{ + if (family == PF_INET) + ssec->nlbl_state = NLBL_REQUIRE; + else + ssec->nlbl_state = NLBL_UNSET; +} + +/** * selinux_netlbl_sk_security_init - Setup the NetLabel fields * @ssec: the sk_security_struct * @family: the socket family @@ -2442,14 +2535,13 @@ netlbl_socket_setsid_return: void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, int family) { - if (family == PF_INET) - ssec->nlbl_state = NLBL_REQUIRE; - else - ssec->nlbl_state = NLBL_UNSET; + /* No locking needed, we are the only one who has access to ssec */ + selinux_netlbl_sk_security_reset(ssec, family); + spin_lock_init(&ssec->nlbl_lock); } /** - * selinux_netlbl_sk_clone_security - Copy the NetLabel fields + * selinux_netlbl_sk_security_clone - Copy the NetLabel fields * @ssec: the original sk_security_struct * @newssec: the cloned sk_security_struct * @@ -2458,41 +2550,41 @@ void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, * @newssec. * */ -void selinux_netlbl_sk_clone_security(struct sk_security_struct *ssec, +void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, struct sk_security_struct *newssec) { + /* We don't need to take newssec->nlbl_lock because we are the only + * thread with access to newssec, but we do need to take the RCU read + * lock as other threads could have access to ssec */ + rcu_read_lock(); + selinux_netlbl_sk_security_reset(newssec, ssec->sk->sk_family); newssec->sclass = ssec->sclass; - if (ssec->nlbl_state != NLBL_UNSET) - newssec->nlbl_state = NLBL_REQUIRE; - else - newssec->nlbl_state = NLBL_UNSET; + rcu_read_unlock(); } /** * selinux_netlbl_socket_post_create - Label a socket using NetLabel * @sock: the socket to label - * @sock_family: the socket family - * @sid: the SID to use * * Description: * Attempt to label a socket using the NetLabel mechanism using the given * SID. Returns zero values on success, negative values on failure. * */ -int selinux_netlbl_socket_post_create(struct socket *sock, - int sock_family, - u32 sid) +int selinux_netlbl_socket_post_create(struct socket *sock) { + int rc = 0; struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; struct sk_security_struct *sksec = sock->sk->sk_security; sksec->sclass = isec->sclass; - if (sock_family != PF_INET) - return 0; + rcu_read_lock(); + if (sksec->nlbl_state == NLBL_REQUIRE) + rc = selinux_netlbl_socket_setsid(sock, sksec->sid); + rcu_read_unlock(); - sksec->nlbl_state = NLBL_REQUIRE; - return selinux_netlbl_socket_setsid(sock, sid); + return rc; } /** @@ -2514,11 +2606,16 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) sksec->sclass = isec->sclass; - if (sk->sk_family != PF_INET) + rcu_read_lock(); + + if (sksec->nlbl_state != NLBL_REQUIRE) { + rcu_read_unlock(); return; + } netlbl_secattr_init(&secattr); if (netlbl_sock_getattr(sk, &secattr) == 0 && + secattr.flags != NETLBL_SECATTR_NONE && selinux_netlbl_secattr_to_sid(NULL, &secattr, SECINITSID_UNLABELED, @@ -2526,35 +2623,12 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) sksec->peer_sid = nlbl_peer_sid; netlbl_secattr_destroy(&secattr); - sksec->nlbl_state = NLBL_REQUIRE; - /* Try to set the NetLabel on the socket to save time later, if we fail * here we will pick up the pieces in later calls to * selinux_netlbl_inode_permission(). */ selinux_netlbl_socket_setsid(sock, sksec->sid); -} - -/** - * selinux_netlbl_inet_conn_request - Handle a new connection request - * @skb: the packet - * @sock_sid: the SID of the parent socket - * - * Description: - * If present, use the security attributes of the packet in @skb and the - * parent sock's SID to arrive at a SID for the new child sock. Returns the - * SID of the connection or SECSID_NULL on failure. - * - */ -u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid) -{ - int rc; - u32 peer_sid; - - rc = selinux_netlbl_skbuff_getsid(skb, sock_sid, &peer_sid); - if (rc != 0) - return SECSID_NULL; - return peer_sid; + rcu_read_unlock(); } /** @@ -2572,25 +2646,24 @@ u32 selinux_netlbl_inet_conn_request(struct sk_buff *skb, u32 sock_sid) int selinux_netlbl_inode_permission(struct inode *inode, int mask) { int rc; - struct inode_security_struct *isec; struct sk_security_struct *sksec; struct socket *sock; - if (!S_ISSOCK(inode->i_mode)) + if (!S_ISSOCK(inode->i_mode) || + ((mask & (MAY_WRITE | MAY_APPEND)) == 0)) return 0; - sock = SOCKET_I(inode); - isec = inode->i_security; sksec = sock->sk->sk_security; - mutex_lock(&isec->lock); - if (unlikely(sksec->nlbl_state == NLBL_REQUIRE && - (mask & (MAY_WRITE | MAY_APPEND)))) { - lock_sock(sock->sk); - rc = selinux_netlbl_socket_setsid(sock, sksec->sid); - release_sock(sock->sk); - } else - rc = 0; - mutex_unlock(&isec->lock); + + rcu_read_lock(); + if (sksec->nlbl_state != NLBL_REQUIRE) { + rcu_read_unlock(); + return 0; + } + lock_sock(sock->sk); + rc = selinux_netlbl_socket_setsid(sock, sksec->sid); + release_sock(sock->sk); + rcu_read_unlock(); return rc; } @@ -2648,42 +2721,6 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, } /** - * selinux_netlbl_socket_getpeersec_stream - Return the connected peer's SID - * @sock: the socket - * - * Description: - * Examine @sock to find the connected peer's SID. Returns the SID on success - * or SECSID_NULL on error. - * - */ -u32 selinux_netlbl_socket_getpeersec_stream(struct socket *sock) -{ - struct sk_security_struct *sksec = sock->sk->sk_security; - return sksec->peer_sid; -} - -/** - * selinux_netlbl_socket_getpeersec_dgram - Return the SID of a NetLabel packet - * @skb: the packet - * - * Description: - * Examine @skb to find the SID assigned to it by NetLabel. Returns the SID on - * success, SECSID_NULL on error. - * - */ -u32 selinux_netlbl_socket_getpeersec_dgram(struct sk_buff *skb) -{ - int peer_sid; - - if (selinux_netlbl_skbuff_getsid(skb, - SECINITSID_UNLABELED, - &peer_sid) != 0) - return SECSID_NULL; - - return peer_sid; -} - -/** * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel * @sock: the socket * @level: the socket level or protocol @@ -2701,21 +2738,19 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock, int optname) { int rc = 0; - struct inode *inode = SOCK_INODE(sock); struct sk_security_struct *sksec = sock->sk->sk_security; - struct inode_security_struct *isec = inode->i_security; struct netlbl_lsm_secattr secattr; - mutex_lock(&isec->lock); + rcu_read_lock(); if (level == IPPROTO_IP && optname == IP_OPTIONS && sksec->nlbl_state == NLBL_LABELED) { netlbl_secattr_init(&secattr); rc = netlbl_socket_getattr(sock, &secattr); - if (rc == 0 && (secattr.cache || secattr.mls_lvl_vld)) + if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) rc = -EACCES; netlbl_secattr_destroy(&secattr); } - mutex_unlock(&isec->lock); + rcu_read_unlock(); return rc; } diff --git a/security/selinux/ss/symtab.c b/security/selinux/ss/symtab.c index 24a10d36d3b..837658a98a5 100644 --- a/security/selinux/ss/symtab.c +++ b/security/selinux/ss/symtab.c @@ -9,9 +9,9 @@ #include <linux/errno.h> #include "symtab.h" -static unsigned int symhash(struct hashtab *h, void *key) +static unsigned int symhash(struct hashtab *h, const void *key) { - char *p, *keyp; + const char *p, *keyp; unsigned int size; unsigned int val; @@ -23,9 +23,9 @@ static unsigned int symhash(struct hashtab *h, void *key) return val & (h->size - 1); } -static int symcmp(struct hashtab *h, void *key1, void *key2) +static int symcmp(struct hashtab *h, const void *key1, const void *key2) { - char *keyp1, *keyp2; + const char *keyp1, *keyp2; keyp1 = key1; keyp2 = key2; |