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authorMichael Halcrow <mhalcrow@us.ibm.com>2007-10-16 04:27:53 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 12:43:10 -0400
commitf4aad16adfb8f0a2d666fdf8af4bd0dff2ce75e4 (patch)
tree42e7f191d1a3a1e1375af24acc5c336b30c5c4d1
parentcce76f9b9696a59974be9ed43478c000c57e597a (diff)
eCryptfs: add key list structure; search keyring
Add support structures for handling multiple keys. The list in crypt_stat contains the key identifiers for all of the keys that should be used for encrypting each file's File Encryption Key (FEK). For now, each inode inherits this list from the mount-wide crypt_stat struct, via the ecryptfs_copy_mount_wide_sigs_to_inode_sigs() function. This patch also removes the global key tfm from the mount-wide crypt_stat struct, instead keeping a list of tfm's meant for dealing with the various inode FEK's. eCryptfs will now search the user's keyring for FEK's parsed from the existing file metadata, so the user can make keys available at any time before or after mounting. Now that multiple FEK packets can be written to the file metadata, we need to be more meticulous about size limits. The updates to the code for writing out packets to the file metadata makes sizes and limits more explicit, uniformly expressed, and (hopefully) easier to follow. Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com> Cc: "Serge E. Hallyn" <serge@hallyn.com> Cc: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat
-rw-r--r--fs/ecryptfs/crypto.c208
-rw-r--r--fs/ecryptfs/ecryptfs_kernel.h71
-rw-r--r--fs/ecryptfs/keystore.c743
-rw-r--r--fs/ecryptfs/main.c121
4 files changed, 742 insertions, 401 deletions
diff --git a/fs/ecryptfs/crypto.c b/fs/ecryptfs/crypto.c
index 6ac630625b70..4f7d89591970 100644
--- a/fs/ecryptfs/crypto.c
+++ b/fs/ecryptfs/crypto.c
@@ -204,6 +204,8 @@ void
204ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat) 204ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
205{ 205{
206 memset((void *)crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat)); 206 memset((void *)crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat));
207 INIT_LIST_HEAD(&crypt_stat->keysig_list);
208 mutex_init(&crypt_stat->keysig_list_mutex);
207 mutex_init(&crypt_stat->cs_mutex); 209 mutex_init(&crypt_stat->cs_mutex);
208 mutex_init(&crypt_stat->cs_tfm_mutex); 210 mutex_init(&crypt_stat->cs_tfm_mutex);
209 mutex_init(&crypt_stat->cs_hash_tfm_mutex); 211 mutex_init(&crypt_stat->cs_hash_tfm_mutex);
@@ -218,20 +220,41 @@ ecryptfs_init_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
218 */ 220 */
219void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat) 221void ecryptfs_destruct_crypt_stat(struct ecryptfs_crypt_stat *crypt_stat)
220{ 222{
223 struct ecryptfs_key_sig *key_sig, *key_sig_tmp;
224
221 if (crypt_stat->tfm) 225 if (crypt_stat->tfm)
222 crypto_free_blkcipher(crypt_stat->tfm); 226 crypto_free_blkcipher(crypt_stat->tfm);
223 if (crypt_stat->hash_tfm) 227 if (crypt_stat->hash_tfm)
224 crypto_free_hash(crypt_stat->hash_tfm); 228 crypto_free_hash(crypt_stat->hash_tfm);
229 mutex_lock(&crypt_stat->keysig_list_mutex);
230 list_for_each_entry_safe(key_sig, key_sig_tmp,
231 &crypt_stat->keysig_list, crypt_stat_list) {
232 list_del(&key_sig->crypt_stat_list);
233 kmem_cache_free(ecryptfs_key_sig_cache, key_sig);
234 }
235 mutex_unlock(&crypt_stat->keysig_list_mutex);
225 memset(crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat)); 236 memset(crypt_stat, 0, sizeof(struct ecryptfs_crypt_stat));
226} 237}
227 238
228void ecryptfs_destruct_mount_crypt_stat( 239void ecryptfs_destruct_mount_crypt_stat(
229 struct ecryptfs_mount_crypt_stat *mount_crypt_stat) 240 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
230{ 241{
231 if (mount_crypt_stat->global_auth_tok_key) 242 struct ecryptfs_global_auth_tok *auth_tok, *auth_tok_tmp;
232 key_put(mount_crypt_stat->global_auth_tok_key); 243
233 if (mount_crypt_stat->global_key_tfm) 244 if (!(mount_crypt_stat->flags & ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED))
234 crypto_free_blkcipher(mount_crypt_stat->global_key_tfm); 245 return;
246 mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
247 list_for_each_entry_safe(auth_tok, auth_tok_tmp,
248 &mount_crypt_stat->global_auth_tok_list,
249 mount_crypt_stat_list) {
250 list_del(&auth_tok->mount_crypt_stat_list);
251 mount_crypt_stat->num_global_auth_toks--;
252 if (auth_tok->global_auth_tok_key
253 && !(auth_tok->flags & ECRYPTFS_AUTH_TOK_INVALID))
254 key_put(auth_tok->global_auth_tok_key);
255 kmem_cache_free(ecryptfs_global_auth_tok_cache, auth_tok);
256 }
257 mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
235 memset(mount_crypt_stat, 0, sizeof(struct ecryptfs_mount_crypt_stat)); 258 memset(mount_crypt_stat, 0, sizeof(struct ecryptfs_mount_crypt_stat));
236} 259}
237 260
@@ -931,6 +954,30 @@ static void ecryptfs_copy_mount_wide_flags_to_inode_flags(
931 crypt_stat->flags |= ECRYPTFS_VIEW_AS_ENCRYPTED; 954 crypt_stat->flags |= ECRYPTFS_VIEW_AS_ENCRYPTED;
932} 955}
933 956
957static int ecryptfs_copy_mount_wide_sigs_to_inode_sigs(
958 struct ecryptfs_crypt_stat *crypt_stat,
959 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
960{
961 struct ecryptfs_global_auth_tok *global_auth_tok;
962 int rc = 0;
963
964 mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
965 list_for_each_entry(global_auth_tok,
966 &mount_crypt_stat->global_auth_tok_list,
967 mount_crypt_stat_list) {
968 rc = ecryptfs_add_keysig(crypt_stat, global_auth_tok->sig);
969 if (rc) {
970 printk(KERN_ERR "Error adding keysig; rc = [%d]\n", rc);
971 mutex_unlock(
972 &mount_crypt_stat->global_auth_tok_list_mutex);
973 goto out;
974 }
975 }
976 mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
977out:
978 return rc;
979}
980
934/** 981/**
935 * ecryptfs_set_default_crypt_stat_vals 982 * ecryptfs_set_default_crypt_stat_vals
936 * @crypt_stat 983 * @crypt_stat
@@ -973,46 +1020,44 @@ static void ecryptfs_set_default_crypt_stat_vals(
973/* Associate an authentication token(s) with the file */ 1020/* Associate an authentication token(s) with the file */
974int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry) 1021int ecryptfs_new_file_context(struct dentry *ecryptfs_dentry)
975{ 1022{
976 int rc = 0;
977 struct ecryptfs_crypt_stat *crypt_stat = 1023 struct ecryptfs_crypt_stat *crypt_stat =
978 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat; 1024 &ecryptfs_inode_to_private(ecryptfs_dentry->d_inode)->crypt_stat;
979 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = 1025 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
980 &ecryptfs_superblock_to_private( 1026 &ecryptfs_superblock_to_private(
981 ecryptfs_dentry->d_sb)->mount_crypt_stat; 1027 ecryptfs_dentry->d_sb)->mount_crypt_stat;
982 int cipher_name_len; 1028 int cipher_name_len;
1029 int rc = 0;
983 1030
984 ecryptfs_set_default_crypt_stat_vals(crypt_stat, mount_crypt_stat); 1031 ecryptfs_set_default_crypt_stat_vals(crypt_stat, mount_crypt_stat);
985 /* See if there are mount crypt options */ 1032 mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
986 if (mount_crypt_stat->global_auth_tok) { 1033 BUG_ON(mount_crypt_stat->num_global_auth_toks == 0);
987 ecryptfs_printk(KERN_DEBUG, "Initializing context for new " 1034 mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
988 "file using mount_crypt_stat\n"); 1035 crypt_stat->flags |= ECRYPTFS_ENCRYPTED;
989 crypt_stat->flags |= ECRYPTFS_ENCRYPTED; 1036 crypt_stat->flags |= ECRYPTFS_KEY_VALID;
990 crypt_stat->flags |= ECRYPTFS_KEY_VALID; 1037 ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat,
991 ecryptfs_copy_mount_wide_flags_to_inode_flags(crypt_stat, 1038 mount_crypt_stat);
992 mount_crypt_stat); 1039 rc = ecryptfs_copy_mount_wide_sigs_to_inode_sigs(crypt_stat,
993 memcpy(crypt_stat->keysigs[crypt_stat->num_keysigs++], 1040 mount_crypt_stat);
994 mount_crypt_stat->global_auth_tok_sig, 1041 if (rc) {
995 ECRYPTFS_SIG_SIZE_HEX); 1042 printk(KERN_ERR "Error attempting to copy mount-wide key sigs "
996 cipher_name_len = 1043 "to the inode key sigs; rc = [%d]\n", rc);
997 strlen(mount_crypt_stat->global_default_cipher_name); 1044 goto out;
998 memcpy(crypt_stat->cipher, 1045 }
999 mount_crypt_stat->global_default_cipher_name, 1046 cipher_name_len =
1000 cipher_name_len); 1047 strlen(mount_crypt_stat->global_default_cipher_name);
1001 crypt_stat->cipher[cipher_name_len] = '\0'; 1048 memcpy(crypt_stat->cipher,
1002 crypt_stat->key_size = 1049 mount_crypt_stat->global_default_cipher_name,
1003 mount_crypt_stat->global_default_cipher_key_size; 1050 cipher_name_len);
1004 ecryptfs_generate_new_key(crypt_stat); 1051 crypt_stat->cipher[cipher_name_len] = '\0';
1005 } else 1052 crypt_stat->key_size =
1006 /* We should not encounter this scenario since we 1053 mount_crypt_stat->global_default_cipher_key_size;
1007 * should detect lack of global_auth_tok at mount time 1054 ecryptfs_generate_new_key(crypt_stat);
1008 * TODO: Applies to 0.1 release only; remove in future
1009 * release */
1010 BUG();
1011 rc = ecryptfs_init_crypt_ctx(crypt_stat); 1055 rc = ecryptfs_init_crypt_ctx(crypt_stat);
1012 if (rc) 1056 if (rc)
1013 ecryptfs_printk(KERN_ERR, "Error initializing cryptographic " 1057 ecryptfs_printk(KERN_ERR, "Error initializing cryptographic "
1014 "context for cipher [%s]: rc = [%d]\n", 1058 "context for cipher [%s]: rc = [%d]\n",
1015 crypt_stat->cipher, rc); 1059 crypt_stat->cipher, rc);
1060out:
1016 return rc; 1061 return rc;
1017} 1062}
1018 1063
@@ -1776,7 +1821,7 @@ out:
1776} 1821}
1777 1822
1778/** 1823/**
1779 * ecryptfs_process_cipher - Perform cipher initialization. 1824 * ecryptfs_process_key_cipher - Perform key cipher initialization.
1780 * @key_tfm: Crypto context for key material, set by this function 1825 * @key_tfm: Crypto context for key material, set by this function
1781 * @cipher_name: Name of the cipher 1826 * @cipher_name: Name of the cipher
1782 * @key_size: Size of the key in bytes 1827 * @key_size: Size of the key in bytes
@@ -1786,8 +1831,8 @@ out:
1786 * event, regardless of whether this function succeeds for fails. 1831 * event, regardless of whether this function succeeds for fails.
1787 */ 1832 */
1788int 1833int
1789ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name, 1834ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
1790 size_t *key_size) 1835 char *cipher_name, size_t *key_size)
1791{ 1836{
1792 char dummy_key[ECRYPTFS_MAX_KEY_BYTES]; 1837 char dummy_key[ECRYPTFS_MAX_KEY_BYTES];
1793 char *full_alg_name; 1838 char *full_alg_name;
@@ -1829,3 +1874,98 @@ ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name,
1829out: 1874out:
1830 return rc; 1875 return rc;
1831} 1876}
1877
1878struct kmem_cache *ecryptfs_key_tfm_cache;
1879struct list_head key_tfm_list;
1880struct mutex key_tfm_list_mutex;
1881
1882int ecryptfs_init_crypto(void)
1883{
1884 mutex_init(&key_tfm_list_mutex);
1885 INIT_LIST_HEAD(&key_tfm_list);
1886 return 0;
1887}
1888
1889int ecryptfs_destruct_crypto(void)
1890{
1891 struct ecryptfs_key_tfm *key_tfm, *key_tfm_tmp;
1892
1893 mutex_lock(&key_tfm_list_mutex);
1894 list_for_each_entry_safe(key_tfm, key_tfm_tmp, &key_tfm_list,
1895 key_tfm_list) {
1896 list_del(&key_tfm->key_tfm_list);
1897 if (key_tfm->key_tfm)
1898 crypto_free_blkcipher(key_tfm->key_tfm);
1899 kmem_cache_free(ecryptfs_key_tfm_cache, key_tfm);
1900 }
1901 mutex_unlock(&key_tfm_list_mutex);
1902 return 0;
1903}
1904
1905int
1906ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
1907 size_t key_size)
1908{
1909 struct ecryptfs_key_tfm *tmp_tfm;
1910 int rc = 0;
1911
1912 tmp_tfm = kmem_cache_alloc(ecryptfs_key_tfm_cache, GFP_KERNEL);
1913 if (key_tfm != NULL)
1914 (*key_tfm) = tmp_tfm;
1915 if (!tmp_tfm) {
1916 rc = -ENOMEM;
1917 printk(KERN_ERR "Error attempting to allocate from "
1918 "ecryptfs_key_tfm_cache\n");
1919 goto out;
1920 }
1921 mutex_init(&tmp_tfm->key_tfm_mutex);
1922 strncpy(tmp_tfm->cipher_name, cipher_name,
1923 ECRYPTFS_MAX_CIPHER_NAME_SIZE);
1924 tmp_tfm->key_size = key_size;
1925 if ((rc = ecryptfs_process_key_cipher(&tmp_tfm->key_tfm,
1926 tmp_tfm->cipher_name,
1927 &tmp_tfm->key_size))) {
1928 printk(KERN_ERR "Error attempting to initialize key TFM "
1929 "cipher with name = [%s]; rc = [%d]\n",
1930 tmp_tfm->cipher_name, rc);
1931 kmem_cache_free(ecryptfs_key_tfm_cache, tmp_tfm);
1932 if (key_tfm != NULL)
1933 (*key_tfm) = NULL;
1934 goto out;
1935 }
1936 mutex_lock(&key_tfm_list_mutex);
1937 list_add(&tmp_tfm->key_tfm_list, &key_tfm_list);
1938 mutex_unlock(&key_tfm_list_mutex);
1939out:
1940 return rc;
1941}
1942
1943int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
1944 struct mutex **tfm_mutex,
1945 char *cipher_name)
1946{
1947 struct ecryptfs_key_tfm *key_tfm;
1948 int rc = 0;
1949
1950 (*tfm) = NULL;
1951 (*tfm_mutex) = NULL;
1952 mutex_lock(&key_tfm_list_mutex);
1953 list_for_each_entry(key_tfm, &key_tfm_list, key_tfm_list) {
1954 if (strcmp(key_tfm->cipher_name, cipher_name) == 0) {
1955 (*tfm) = key_tfm->key_tfm;
1956 (*tfm_mutex) = &key_tfm->key_tfm_mutex;
1957 mutex_unlock(&key_tfm_list_mutex);
1958 goto out;
1959 }
1960 }
1961 mutex_unlock(&key_tfm_list_mutex);
1962 if ((rc = ecryptfs_add_new_key_tfm(&key_tfm, cipher_name, 0))) {
1963 printk(KERN_ERR "Error adding new key_tfm to list; rc = [%d]\n",
1964 rc);
1965 goto out;
1966 }
1967 (*tfm) = key_tfm->key_tfm;
1968 (*tfm_mutex) = &key_tfm->key_tfm_mutex;
1969out:
1970 return rc;
1971}
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 1b9dd9a96f19..6ddab6c856ac 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -48,10 +48,12 @@
48#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004 48#define ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH 0x00000004
49#define ECRYPTFS_VERSIONING_POLICY 0x00000008 49#define ECRYPTFS_VERSIONING_POLICY 0x00000008
50#define ECRYPTFS_VERSIONING_XATTR 0x00000010 50#define ECRYPTFS_VERSIONING_XATTR 0x00000010
51#define ECRYPTFS_VERSIONING_MULTKEY 0x00000020
51#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \ 52#define ECRYPTFS_VERSIONING_MASK (ECRYPTFS_VERSIONING_PASSPHRASE \
52 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \ 53 | ECRYPTFS_VERSIONING_PLAINTEXT_PASSTHROUGH \
53 | ECRYPTFS_VERSIONING_PUBKEY \ 54 | ECRYPTFS_VERSIONING_PUBKEY \
54 | ECRYPTFS_VERSIONING_XATTR) 55 | ECRYPTFS_VERSIONING_XATTR \
56 | ECRYPTFS_VERSIONING_MULTKEY)
55#define ECRYPTFS_MAX_PASSWORD_LENGTH 64 57#define ECRYPTFS_MAX_PASSWORD_LENGTH 64
56#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH 58#define ECRYPTFS_MAX_PASSPHRASE_BYTES ECRYPTFS_MAX_PASSWORD_LENGTH
57#define ECRYPTFS_SALT_SIZE 8 59#define ECRYPTFS_SALT_SIZE 8
@@ -144,6 +146,7 @@ struct ecryptfs_private_key {
144struct ecryptfs_auth_tok { 146struct ecryptfs_auth_tok {
145 u16 version; /* 8-bit major and 8-bit minor */ 147 u16 version; /* 8-bit major and 8-bit minor */
146 u16 token_type; 148 u16 token_type;
149#define ECRYPTFS_ENCRYPT_ONLY 0x00000001
147 u32 flags; 150 u32 flags;
148 struct ecryptfs_session_key session_key; 151 struct ecryptfs_session_key session_key;
149 u8 reserved[32]; 152 u8 reserved[32];
@@ -153,6 +156,7 @@ struct ecryptfs_auth_tok {
153 } token; 156 } token;
154} __attribute__ ((packed)); 157} __attribute__ ((packed));
155 158
159int ecryptfs_get_auth_tok_sig(char **sig, struct ecryptfs_auth_tok *auth_tok);
156void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok); 160void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok);
157extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size); 161extern void ecryptfs_to_hex(char *dst, char *src, size_t src_size);
158extern void ecryptfs_from_hex(char *dst, char *src, int dst_size); 162extern void ecryptfs_from_hex(char *dst, char *src, int dst_size);
@@ -194,7 +198,6 @@ ecryptfs_get_key_payload_data(struct key *key)
194#define ECRYPTFS_MAX_KEYSET_SIZE 1024 198#define ECRYPTFS_MAX_KEYSET_SIZE 1024
195#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32 199#define ECRYPTFS_MAX_CIPHER_NAME_SIZE 32
196#define ECRYPTFS_MAX_NUM_ENC_KEYS 64 200#define ECRYPTFS_MAX_NUM_ENC_KEYS 64
197#define ECRYPTFS_MAX_NUM_KEYSIGS 2 /* TODO: Make this a linked list */
198#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */ 201#define ECRYPTFS_MAX_IV_BYTES 16 /* 128 bits */
199#define ECRYPTFS_SALT_BYTES 2 202#define ECRYPTFS_SALT_BYTES 2
200#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5 203#define MAGIC_ECRYPTFS_MARKER 0x3c81b7f5
@@ -212,6 +215,11 @@ ecryptfs_get_key_payload_data(struct key *key)
212#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43 215#define ECRYPTFS_TAG_67_PACKET_TYPE 0x43
213#define MD5_DIGEST_SIZE 16 216#define MD5_DIGEST_SIZE 16
214 217
218struct ecryptfs_key_sig {
219 struct list_head crypt_stat_list;
220 char keysig[ECRYPTFS_SIG_SIZE_HEX];
221};
222
215/** 223/**
216 * This is the primary struct associated with each encrypted file. 224 * This is the primary struct associated with each encrypted file.
217 * 225 *
@@ -231,7 +239,6 @@ struct ecryptfs_crypt_stat {
231 u32 flags; 239 u32 flags;
232 unsigned int file_version; 240 unsigned int file_version;
233 size_t iv_bytes; 241 size_t iv_bytes;
234 size_t num_keysigs;
235 size_t header_extent_size; 242 size_t header_extent_size;
236 size_t num_header_extents_at_front; 243 size_t num_header_extents_at_front;
237 size_t extent_size; /* Data extent size; default is 4096 */ 244 size_t extent_size; /* Data extent size; default is 4096 */
@@ -245,7 +252,8 @@ struct ecryptfs_crypt_stat {
245 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE]; 252 unsigned char cipher[ECRYPTFS_MAX_CIPHER_NAME_SIZE];
246 unsigned char key[ECRYPTFS_MAX_KEY_BYTES]; 253 unsigned char key[ECRYPTFS_MAX_KEY_BYTES];
247 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES]; 254 unsigned char root_iv[ECRYPTFS_MAX_IV_BYTES];
248 unsigned char keysigs[ECRYPTFS_MAX_NUM_KEYSIGS][ECRYPTFS_SIG_SIZE_HEX]; 255 struct list_head keysig_list;
256 struct mutex keysig_list_mutex;
249 struct mutex cs_tfm_mutex; 257 struct mutex cs_tfm_mutex;
250 struct mutex cs_hash_tfm_mutex; 258 struct mutex cs_hash_tfm_mutex;
251 struct mutex cs_mutex; 259 struct mutex cs_mutex;
@@ -265,6 +273,26 @@ struct ecryptfs_dentry_info {
265 struct ecryptfs_crypt_stat *crypt_stat; 273 struct ecryptfs_crypt_stat *crypt_stat;
266}; 274};
267 275
276struct ecryptfs_global_auth_tok {
277#define ECRYPTFS_AUTH_TOK_INVALID 0x00000001
278 u32 flags;
279 struct list_head mount_crypt_stat_list;
280 struct key *global_auth_tok_key;
281 struct ecryptfs_auth_tok *global_auth_tok;
282 unsigned char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
283};
284
285struct ecryptfs_key_tfm {
286 struct crypto_blkcipher *key_tfm;
287 size_t key_size;
288 struct mutex key_tfm_mutex;
289 struct list_head key_tfm_list;
290 unsigned char cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE + 1];
291};
292
293extern struct list_head key_tfm_list;
294extern struct mutex key_tfm_list_mutex;
295
268/** 296/**
269 * This struct is to enable a mount-wide passphrase/salt combo. This 297 * This struct is to enable a mount-wide passphrase/salt combo. This
270 * is more or less a stopgap to provide similar functionality to other 298 * is more or less a stopgap to provide similar functionality to other
@@ -276,15 +304,14 @@ struct ecryptfs_mount_crypt_stat {
276#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001 304#define ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED 0x00000001
277#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002 305#define ECRYPTFS_XATTR_METADATA_ENABLED 0x00000002
278#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004 306#define ECRYPTFS_ENCRYPTED_VIEW_ENABLED 0x00000004
307#define ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED 0x00000008
279 u32 flags; 308 u32 flags;
280 struct ecryptfs_auth_tok *global_auth_tok; 309 struct list_head global_auth_tok_list;
281 struct key *global_auth_tok_key; 310 struct mutex global_auth_tok_list_mutex;
311 size_t num_global_auth_toks;
282 size_t global_default_cipher_key_size; 312 size_t global_default_cipher_key_size;
283 struct crypto_blkcipher *global_key_tfm;
284 struct mutex global_key_tfm_mutex;
285 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE 313 unsigned char global_default_cipher_name[ECRYPTFS_MAX_CIPHER_NAME_SIZE
286 + 1]; 314 + 1];
287 unsigned char global_auth_tok_sig[ECRYPTFS_SIG_SIZE_HEX + 1];
288}; 315};
289 316
290/* superblock private data. */ 317/* superblock private data. */
@@ -468,6 +495,9 @@ extern struct kmem_cache *ecryptfs_header_cache_2;
468extern struct kmem_cache *ecryptfs_xattr_cache; 495extern struct kmem_cache *ecryptfs_xattr_cache;
469extern struct kmem_cache *ecryptfs_lower_page_cache; 496extern struct kmem_cache *ecryptfs_lower_page_cache;
470extern struct kmem_cache *ecryptfs_key_record_cache; 497extern struct kmem_cache *ecryptfs_key_record_cache;
498extern struct kmem_cache *ecryptfs_key_sig_cache;
499extern struct kmem_cache *ecryptfs_global_auth_tok_cache;
500extern struct kmem_cache *ecryptfs_key_tfm_cache;
471 501
472int ecryptfs_interpose(struct dentry *hidden_dentry, 502int ecryptfs_interpose(struct dentry *hidden_dentry,
473 struct dentry *this_dentry, struct super_block *sb, 503 struct dentry *this_dentry, struct super_block *sb,
@@ -538,9 +568,8 @@ int
538ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat, 568ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
539 unsigned char *src, struct dentry *ecryptfs_dentry); 569 unsigned char *src, struct dentry *ecryptfs_dentry);
540int ecryptfs_truncate(struct dentry *dentry, loff_t new_length); 570int ecryptfs_truncate(struct dentry *dentry, loff_t new_length);
541int 571int ecryptfs_process_key_cipher(struct crypto_blkcipher **key_tfm,
542ecryptfs_process_cipher(struct crypto_blkcipher **key_tfm, char *cipher_name, 572 char *cipher_name, size_t *key_size);
543 size_t *key_size);
544int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode); 573int ecryptfs_inode_test(struct inode *inode, void *candidate_lower_inode);
545int ecryptfs_inode_set(struct inode *inode, void *lower_inode); 574int ecryptfs_inode_set(struct inode *inode, void *lower_inode);
546void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode); 575void ecryptfs_init_inode(struct inode *inode, struct inode *lower_inode);
@@ -580,6 +609,24 @@ void
580ecryptfs_write_header_metadata(char *virt, 609ecryptfs_write_header_metadata(char *virt,
581 struct ecryptfs_crypt_stat *crypt_stat, 610 struct ecryptfs_crypt_stat *crypt_stat,
582 size_t *written); 611 size_t *written);
612int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig);
613int
614ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
615 char *sig);
616int ecryptfs_get_global_auth_tok_for_sig(
617 struct ecryptfs_global_auth_tok **global_auth_tok,
618 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig);
619int
620ecryptfs_add_new_key_tfm(struct ecryptfs_key_tfm **key_tfm, char *cipher_name,
621 size_t key_size);
622int ecryptfs_init_crypto(void);
623int ecryptfs_destruct_crypto(void);
624int ecryptfs_get_tfm_and_mutex_for_cipher_name(struct crypto_blkcipher **tfm,
625 struct mutex **tfm_mutex,
626 char *cipher_name);
627int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
628 struct ecryptfs_auth_tok **auth_tok,
629 char *sig);
583int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start, 630int ecryptfs_write_zeros(struct file *file, pgoff_t index, int start,
584 int num_zeros); 631 int num_zeros);
585 632
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c
index b550dea8eee6..a1764fe3318c 100644
--- a/fs/ecryptfs/keystore.c
+++ b/fs/ecryptfs/keystore.c
@@ -402,20 +402,24 @@ out:
402 * 402 *
403 * Returns Zero on success; non-zero error otherwise. 403 * Returns Zero on success; non-zero error otherwise.
404 */ 404 */
405static int decrypt_pki_encrypted_session_key( 405static int
406 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, 406decrypt_pki_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
407 struct ecryptfs_auth_tok *auth_tok, 407 struct ecryptfs_crypt_stat *crypt_stat)
408 struct ecryptfs_crypt_stat *crypt_stat)
409{ 408{
410 u16 cipher_code = 0; 409 u16 cipher_code = 0;
411 struct ecryptfs_msg_ctx *msg_ctx; 410 struct ecryptfs_msg_ctx *msg_ctx;
412 struct ecryptfs_message *msg = NULL; 411 struct ecryptfs_message *msg = NULL;
412 char *auth_tok_sig;
413 char *netlink_message; 413 char *netlink_message;
414 size_t netlink_message_length; 414 size_t netlink_message_length;
415 int rc; 415 int rc;
416 416
417 rc = write_tag_64_packet(mount_crypt_stat->global_auth_tok_sig, 417 if ((rc = ecryptfs_get_auth_tok_sig(&auth_tok_sig, auth_tok))) {
418 &(auth_tok->session_key), 418 printk(KERN_ERR "Unrecognized auth tok type: [%d]\n",
419 auth_tok->token_type);
420 goto out;
421 }
422 rc = write_tag_64_packet(auth_tok_sig, &(auth_tok->session_key),
419 &netlink_message, &netlink_message_length); 423 &netlink_message, &netlink_message_length);
420 if (rc) { 424 if (rc) {
421 ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet"); 425 ecryptfs_printk(KERN_ERR, "Failed to write tag 64 packet");
@@ -921,126 +925,241 @@ out:
921 return rc; 925 return rc;
922} 926}
923 927
928static int
929ecryptfs_find_global_auth_tok_for_sig(
930 struct ecryptfs_global_auth_tok **global_auth_tok,
931 struct ecryptfs_mount_crypt_stat *mount_crypt_stat, char *sig)
932{
933 struct ecryptfs_global_auth_tok *walker;
934 int rc = 0;
935
936 (*global_auth_tok) = NULL;
937 mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
938 list_for_each_entry(walker,
939 &mount_crypt_stat->global_auth_tok_list,
940 mount_crypt_stat_list) {
941 if (memcmp(walker->sig, sig, ECRYPTFS_SIG_SIZE_HEX) == 0) {
942 (*global_auth_tok) = walker;
943 goto out;
944 }
945 }
946 rc = -EINVAL;
947out:
948 mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
949 return rc;
950}
951
924/** 952/**
925 * decrypt_session_key - Decrypt the session key with the given auth_tok. 953 * ecryptfs_verify_version
954 * @version: The version number to confirm
955 *
956 * Returns zero on good version; non-zero otherwise
957 */
958static int ecryptfs_verify_version(u16 version)
959{
960 int rc = 0;
961 unsigned char major;
962 unsigned char minor;
963
964 major = ((version >> 8) & 0xFF);
965 minor = (version & 0xFF);
966 if (major != ECRYPTFS_VERSION_MAJOR) {
967 ecryptfs_printk(KERN_ERR, "Major version number mismatch. "
968 "Expected [%d]; got [%d]\n",
969 ECRYPTFS_VERSION_MAJOR, major);
970 rc = -EINVAL;
971 goto out;
972 }
973 if (minor != ECRYPTFS_VERSION_MINOR) {
974 ecryptfs_printk(KERN_ERR, "Minor version number mismatch. "
975 "Expected [%d]; got [%d]\n",
976 ECRYPTFS_VERSION_MINOR, minor);
977 rc = -EINVAL;
978 goto out;
979 }
980out:
981 return rc;
982}
983
984int ecryptfs_keyring_auth_tok_for_sig(struct key **auth_tok_key,
985 struct ecryptfs_auth_tok **auth_tok,
986 char *sig)
987{
988 int rc = 0;
989
990 (*auth_tok_key) = request_key(&key_type_user, sig, NULL);
991 if (!(*auth_tok_key) || IS_ERR(*auth_tok_key)) {
992 printk(KERN_ERR "Could not find key with description: [%s]\n",
993 sig);
994 process_request_key_err(PTR_ERR(*auth_tok_key));
995 rc = -EINVAL;
996 goto out;
997 }
998 (*auth_tok) = ecryptfs_get_key_payload_data(*auth_tok_key);
999 if (ecryptfs_verify_version((*auth_tok)->version)) {
1000 printk(KERN_ERR
1001 "Data structure version mismatch. "
1002 "Userspace tools must match eCryptfs "
1003 "kernel module with major version [%d] "
1004 "and minor version [%d]\n",
1005 ECRYPTFS_VERSION_MAJOR,
1006 ECRYPTFS_VERSION_MINOR);
1007 rc = -EINVAL;
1008 goto out;
1009 }
1010 if ((*auth_tok)->token_type != ECRYPTFS_PASSWORD
1011 && (*auth_tok)->token_type != ECRYPTFS_PRIVATE_KEY) {
1012 printk(KERN_ERR "Invalid auth_tok structure "
1013 "returned from key query\n");
1014 rc = -EINVAL;
1015 goto out;
1016 }
1017out:
1018 return rc;
1019}
1020
1021/**
1022 * ecryptfs_find_auth_tok_for_sig
1023 * @auth_tok: Set to the matching auth_tok; NULL if not found
1024 * @crypt_stat: inode crypt_stat crypto context
1025 * @sig: Sig of auth_tok to find
1026 *
1027 * For now, this function simply looks at the registered auth_tok's
1028 * linked off the mount_crypt_stat, so all the auth_toks that can be
1029 * used must be registered at mount time. This function could
1030 * potentially try a lot harder to find auth_tok's (e.g., by calling
1031 * out to ecryptfsd to dynamically retrieve an auth_tok object) so
1032 * that static registration of auth_tok's will no longer be necessary.
1033 *
1034 * Returns zero on no error; non-zero on error
1035 */
1036static int
1037ecryptfs_find_auth_tok_for_sig(
1038 struct ecryptfs_auth_tok **auth_tok,
1039 struct ecryptfs_crypt_stat *crypt_stat, char *sig)
1040{
1041 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
1042 crypt_stat->mount_crypt_stat;
1043 struct ecryptfs_global_auth_tok *global_auth_tok;
1044 int rc = 0;
1045
1046 (*auth_tok) = NULL;
1047 if (ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok,
1048 mount_crypt_stat, sig)) {
1049 struct key *auth_tok_key;
1050
1051 rc = ecryptfs_keyring_auth_tok_for_sig(&auth_tok_key, auth_tok,
1052 sig);
1053 } else
1054 (*auth_tok) = global_auth_tok->global_auth_tok;
1055 return rc;
1056}
1057
1058/**
1059 * decrypt_passphrase_encrypted_session_key - Decrypt the session key
1060 * with the given auth_tok.
926 * 1061 *
927 * Returns Zero on success; non-zero error otherwise. 1062 * Returns Zero on success; non-zero error otherwise.
928 */ 1063 */
929static int decrypt_session_key(struct ecryptfs_auth_tok *auth_tok, 1064static int
930 struct ecryptfs_crypt_stat *crypt_stat) 1065decrypt_passphrase_encrypted_session_key(struct ecryptfs_auth_tok *auth_tok,
1066 struct ecryptfs_crypt_stat *crypt_stat)
931{ 1067{
932 struct ecryptfs_password *password_s_ptr; 1068 struct scatterlist dst_sg;
933 struct scatterlist src_sg[2], dst_sg[2]; 1069 struct scatterlist src_sg;
934 struct mutex *tfm_mutex = NULL; 1070 struct mutex *tfm_mutex = NULL;
935 char *encrypted_session_key;
936 char *session_key;
937 struct blkcipher_desc desc = { 1071 struct blkcipher_desc desc = {
938 .flags = CRYPTO_TFM_REQ_MAY_SLEEP 1072 .flags = CRYPTO_TFM_REQ_MAY_SLEEP
939 }; 1073 };
940 int rc = 0; 1074 int rc = 0;
941 1075
942 password_s_ptr = &auth_tok->token.password; 1076 if (unlikely(ecryptfs_verbosity > 0)) {
943 if (password_s_ptr->flags & ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET) 1077 ecryptfs_printk(
944 ecryptfs_printk(KERN_DEBUG, "Session key encryption key " 1078 KERN_DEBUG, "Session key encryption key (size [%d]):\n",
945 "set; skipping key generation\n"); 1079 auth_tok->token.password.session_key_encryption_key_bytes);
946 ecryptfs_printk(KERN_DEBUG, "Session key encryption key (size [%d])" 1080 ecryptfs_dump_hex(
947 ":\n", 1081 auth_tok->token.password.session_key_encryption_key,
948 password_s_ptr->session_key_encryption_key_bytes); 1082 auth_tok->token.password.session_key_encryption_key_bytes);
949 if (ecryptfs_verbosity > 0) 1083 }
950 ecryptfs_dump_hex(password_s_ptr->session_key_encryption_key, 1084 rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
951 password_s_ptr-> 1085 crypt_stat->cipher);
952 session_key_encryption_key_bytes); 1086 if (unlikely(rc)) {
953 if (!strcmp(crypt_stat->cipher, 1087 printk(KERN_ERR "Internal error whilst attempting to get "
954 crypt_stat->mount_crypt_stat->global_default_cipher_name) 1088 "tfm and mutex for cipher name [%s]; rc = [%d]\n",
955 && crypt_stat->mount_crypt_stat->global_key_tfm) { 1089 crypt_stat->cipher, rc);
956 desc.tfm = crypt_stat->mount_crypt_stat->global_key_tfm; 1090 goto out;
957 tfm_mutex = &crypt_stat->mount_crypt_stat->global_key_tfm_mutex;
958 } else {
959 char *full_alg_name;
960
961 rc = ecryptfs_crypto_api_algify_cipher_name(&full_alg_name,
962 crypt_stat->cipher,
963 "ecb");
964 if (rc)
965 goto out;
966 desc.tfm = crypto_alloc_blkcipher(full_alg_name, 0,
967 CRYPTO_ALG_ASYNC);
968 kfree(full_alg_name);
969 if (IS_ERR(desc.tfm)) {
970 rc = PTR_ERR(desc.tfm);
971 printk(KERN_ERR "Error allocating crypto context; "
972 "rc = [%d]\n", rc);
973 goto out;
974 }
975 crypto_blkcipher_set_flags(desc.tfm, CRYPTO_TFM_REQ_WEAK_KEY);
976 } 1091 }
977 if (tfm_mutex) 1092 if ((rc = virt_to_scatterlist(auth_tok->session_key.encrypted_key,
978 mutex_lock(tfm_mutex); 1093 auth_tok->session_key.encrypted_key_size,
979 rc = crypto_blkcipher_setkey(desc.tfm, 1094 &src_sg, 1)) != 1) {
980 password_s_ptr->session_key_encryption_key, 1095 printk(KERN_ERR "Internal error whilst attempting to convert "
981 crypt_stat->key_size); 1096 "auth_tok->session_key.encrypted_key to scatterlist; "
982 if (rc < 0) { 1097 "expected rc = 1; got rc = [%d]. "
1098 "auth_tok->session_key.encrypted_key_size = [%d]\n", rc,
1099 auth_tok->session_key.encrypted_key_size);
1100 goto out;
1101 }
1102 auth_tok->session_key.decrypted_key_size =
1103 auth_tok->session_key.encrypted_key_size;
1104 if ((rc = virt_to_scatterlist(auth_tok->session_key.decrypted_key,
1105 auth_tok->session_key.decrypted_key_size,
1106 &dst_sg, 1)) != 1) {
1107 printk(KERN_ERR "Internal error whilst attempting to convert "
1108 "auth_tok->session_key.decrypted_key to scatterlist; "
1109 "expected rc = 1; got rc = [%d]\n", rc);
1110 goto out;
1111 }
1112 mutex_lock(tfm_mutex);
1113 rc = crypto_blkcipher_setkey(
1114 desc.tfm, auth_tok->token.password.session_key_encryption_key,
1115 crypt_stat->key_size);
1116 if (unlikely(rc < 0)) {
1117 mutex_unlock(tfm_mutex);
983 printk(KERN_ERR "Error setting key for crypto context\n"); 1118 printk(KERN_ERR "Error setting key for crypto context\n");
984 rc = -EINVAL; 1119 rc = -EINVAL;
985 goto out_free_tfm; 1120 goto out;
986 }
987 /* TODO: virt_to_scatterlist */
988 encrypted_session_key = (char *)__get_free_page(GFP_KERNEL);
989 if (!encrypted_session_key) {
990 ecryptfs_printk(KERN_ERR, "Out of memory\n");
991 rc = -ENOMEM;
992 goto out_free_tfm;
993 } 1121 }
994 session_key = (char *)__get_free_page(GFP_KERNEL); 1122 rc = crypto_blkcipher_decrypt(&desc, &dst_sg, &src_sg,
995 if (!session_key) {
996 kfree(encrypted_session_key);
997 ecryptfs_printk(KERN_ERR, "Out of memory\n");
998 rc = -ENOMEM;
999 goto out_free_tfm;
1000 }
1001 memcpy(encrypted_session_key, auth_tok->session_key.encrypted_key,
1002 auth_tok->session_key.encrypted_key_size);
1003 src_sg[0].page = virt_to_page(encrypted_session_key);
1004 src_sg[0].offset = 0;
1005 BUG_ON(auth_tok->session_key.encrypted_key_size > PAGE_CACHE_SIZE);
1006 src_sg[0].length = auth_tok->session_key.encrypted_key_size;
1007 dst_sg[0].page = virt_to_page(session_key);
1008 dst_sg[0].offset = 0;
1009 auth_tok->session_key.decrypted_key_size =
1010 auth_tok->session_key.encrypted_key_size;
1011 dst_sg[0].length = auth_tok->session_key.encrypted_key_size;
1012 rc = crypto_blkcipher_decrypt(&desc, dst_sg, src_sg,
1013 auth_tok->session_key.encrypted_key_size); 1123 auth_tok->session_key.encrypted_key_size);
1014 if (rc) { 1124 mutex_unlock(tfm_mutex);
1125 if (unlikely(rc)) {
1015 printk(KERN_ERR "Error decrypting; rc = [%d]\n", rc); 1126 printk(KERN_ERR "Error decrypting; rc = [%d]\n", rc);
1016 goto out_free_memory; 1127 goto out;
1017 } 1128 }
1018 auth_tok->session_key.decrypted_key_size =
1019 auth_tok->session_key.encrypted_key_size;
1020 memcpy(auth_tok->session_key.decrypted_key, session_key,
1021 auth_tok->session_key.decrypted_key_size);
1022 auth_tok->session_key.flags |= ECRYPTFS_CONTAINS_DECRYPTED_KEY; 1129 auth_tok->session_key.flags |= ECRYPTFS_CONTAINS_DECRYPTED_KEY;
1023 memcpy(crypt_stat->key, auth_tok->session_key.decrypted_key, 1130 memcpy(crypt_stat->key, auth_tok->session_key.decrypted_key,
1024 auth_tok->session_key.decrypted_key_size); 1131 auth_tok->session_key.decrypted_key_size);
1025 crypt_stat->flags |= ECRYPTFS_KEY_VALID; 1132 crypt_stat->flags |= ECRYPTFS_KEY_VALID;
1026 ecryptfs_printk(KERN_DEBUG, "Decrypted session key:\n"); 1133 if (unlikely(ecryptfs_verbosity > 0)) {
1027 if (ecryptfs_verbosity > 0) 1134 ecryptfs_printk(KERN_DEBUG, "FEK of size [%d]:\n",
1135 crypt_stat->key_size);
1028 ecryptfs_dump_hex(crypt_stat->key, 1136 ecryptfs_dump_hex(crypt_stat->key,
1029 crypt_stat->key_size); 1137 crypt_stat->key_size);
1030out_free_memory: 1138 }
1031 memset(encrypted_session_key, 0, PAGE_CACHE_SIZE);
1032 free_page((unsigned long)encrypted_session_key);
1033 memset(session_key, 0, PAGE_CACHE_SIZE);
1034 free_page((unsigned long)session_key);
1035out_free_tfm:
1036 if (tfm_mutex)
1037 mutex_unlock(tfm_mutex);
1038 else
1039 crypto_free_blkcipher(desc.tfm);
1040out: 1139out:
1041 return rc; 1140 return rc;
1042} 1141}
1043 1142
1143int ecryptfs_get_auth_tok_sig(char **sig, struct ecryptfs_auth_tok *auth_tok)
1144{
1145 int rc = 0;
1146
1147 (*sig) = NULL;
1148 switch (auth_tok->token_type) {
1149 case ECRYPTFS_PASSWORD:
1150 (*sig) = auth_tok->token.password.signature;
1151 break;
1152 case ECRYPTFS_PRIVATE_KEY:
1153 (*sig) = auth_tok->token.private_key.signature;
1154 break;
1155 default:
1156 printk(KERN_ERR "Cannot get sig for auth_tok of type [%d]\n",
1157 auth_tok->token_type);
1158 rc = -EINVAL;
1159 }
1160 return rc;
1161}
1162
1044/** 1163/**
1045 * ecryptfs_parse_packet_set 1164 * ecryptfs_parse_packet_set
1046 * @dest: The header page in memory 1165 * @dest: The header page in memory
@@ -1058,25 +1177,22 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
1058 struct dentry *ecryptfs_dentry) 1177 struct dentry *ecryptfs_dentry)
1059{ 1178{
1060 size_t i = 0; 1179 size_t i = 0;
1061 size_t found_auth_tok = 0; 1180 size_t found_auth_tok;
1062 size_t next_packet_is_auth_tok_packet; 1181 size_t next_packet_is_auth_tok_packet;
1063 char sig[ECRYPTFS_SIG_SIZE_HEX];
1064 struct list_head auth_tok_list; 1182 struct list_head auth_tok_list;
1065 struct list_head *walker; 1183 struct ecryptfs_auth_tok *matching_auth_tok = NULL;
1066 struct ecryptfs_auth_tok *chosen_auth_tok = NULL;
1067 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
1068 &ecryptfs_superblock_to_private(
1069 ecryptfs_dentry->d_sb)->mount_crypt_stat;
1070 struct ecryptfs_auth_tok *candidate_auth_tok = NULL; 1184 struct ecryptfs_auth_tok *candidate_auth_tok = NULL;
1185 char *candidate_auth_tok_sig;
1071 size_t packet_size; 1186 size_t packet_size;
1072 struct ecryptfs_auth_tok *new_auth_tok; 1187 struct ecryptfs_auth_tok *new_auth_tok;
1073 unsigned char sig_tmp_space[ECRYPTFS_SIG_SIZE]; 1188 unsigned char sig_tmp_space[ECRYPTFS_SIG_SIZE];
1189 struct ecryptfs_auth_tok_list_item *auth_tok_list_item;
1074 size_t tag_11_contents_size; 1190 size_t tag_11_contents_size;
1075 size_t tag_11_packet_size; 1191 size_t tag_11_packet_size;
1076 int rc = 0; 1192 int rc = 0;
1077 1193
1078 INIT_LIST_HEAD(&auth_tok_list); 1194 INIT_LIST_HEAD(&auth_tok_list);
1079 /* Parse the header to find as many packets as we can, these will be 1195 /* Parse the header to find as many packets as we can; these will be
1080 * added the our &auth_tok_list */ 1196 * added the our &auth_tok_list */
1081 next_packet_is_auth_tok_packet = 1; 1197 next_packet_is_auth_tok_packet = 1;
1082 while (next_packet_is_auth_tok_packet) { 1198 while (next_packet_is_auth_tok_packet) {
@@ -1155,73 +1271,86 @@ int ecryptfs_parse_packet_set(struct ecryptfs_crypt_stat *crypt_stat,
1155 } 1271 }
1156 } 1272 }
1157 if (list_empty(&auth_tok_list)) { 1273 if (list_empty(&auth_tok_list)) {
1158 rc = -EINVAL; /* Do not support non-encrypted files in 1274 printk(KERN_ERR "The lower file appears to be a non-encrypted "
1159 * the 0.1 release */ 1275 "eCryptfs file; this is not supported in this version "
1276 "of the eCryptfs kernel module\n");
1277 rc = -EINVAL;
1160 goto out; 1278 goto out;
1161 } 1279 }
1162 /* If we have a global auth tok, then we should try to use 1280 /* auth_tok_list contains the set of authentication tokens
1163 * it */ 1281 * parsed from the metadata. We need to find a matching
1164 if (mount_crypt_stat->global_auth_tok) { 1282 * authentication token that has the secret component(s)
1165 memcpy(sig, mount_crypt_stat->global_auth_tok_sig, 1283 * necessary to decrypt the EFEK in the auth_tok parsed from
1166 ECRYPTFS_SIG_SIZE_HEX); 1284 * the metadata. There may be several potential matches, but
1167 chosen_auth_tok = mount_crypt_stat->global_auth_tok; 1285 * just one will be sufficient to decrypt to get the FEK. */
1168 } else 1286find_next_matching_auth_tok:
1169 BUG(); /* We should always have a global auth tok in 1287 found_auth_tok = 0;
1170 * the 0.1 release */ 1288 list_for_each_entry(auth_tok_list_item, &auth_tok_list, list) {
1171 /* Scan list to see if our chosen_auth_tok works */
1172 list_for_each(walker, &auth_tok_list) {
1173 struct ecryptfs_auth_tok_list_item *auth_tok_list_item;
1174 auth_tok_list_item =
1175 list_entry(walker, struct ecryptfs_auth_tok_list_item,
1176 list);
1177 candidate_auth_tok = &auth_tok_list_item->auth_tok; 1289 candidate_auth_tok = &auth_tok_list_item->auth_tok;
1178 if (unlikely(ecryptfs_verbosity > 0)) { 1290 if (unlikely(ecryptfs_verbosity > 0)) {
1179 ecryptfs_printk(KERN_DEBUG, 1291 ecryptfs_printk(KERN_DEBUG,
1180 "Considering cadidate auth tok:\n"); 1292 "Considering cadidate auth tok:\n");
1181 ecryptfs_dump_auth_tok(candidate_auth_tok); 1293 ecryptfs_dump_auth_tok(candidate_auth_tok);
1182 } 1294 }
1183 /* TODO: Replace ECRYPTFS_SIG_SIZE_HEX w/ dynamic value */ 1295 if ((rc = ecryptfs_get_auth_tok_sig(&candidate_auth_tok_sig,
1184 if (candidate_auth_tok->token_type == ECRYPTFS_PASSWORD 1296 candidate_auth_tok))) {
1185 && !strncmp(candidate_auth_tok->token.password.signature, 1297 printk(KERN_ERR
1186 sig, ECRYPTFS_SIG_SIZE_HEX)) { 1298 "Unrecognized candidate auth tok type: [%d]\n",
1187 found_auth_tok = 1; 1299 candidate_auth_tok->token_type);
1188 goto leave_list; 1300 rc = -EINVAL;
1189 /* TODO: Transfer the common salt into the 1301 goto out_wipe_list;
1190 * crypt_stat salt */ 1302 }
1191 } else if ((candidate_auth_tok->token_type 1303 if ((rc = ecryptfs_find_auth_tok_for_sig(
1192 == ECRYPTFS_PRIVATE_KEY) 1304 &matching_auth_tok, crypt_stat,
1193 && !strncmp(candidate_auth_tok->token.private_key.signature, 1305 candidate_auth_tok_sig)))
1194 sig, ECRYPTFS_SIG_SIZE_HEX)) { 1306 rc = 0;
1307 if (matching_auth_tok) {
1195 found_auth_tok = 1; 1308 found_auth_tok = 1;
1196 goto leave_list; 1309 goto found_matching_auth_tok;
1197 } 1310 }
1198 } 1311 }
1199 if (!found_auth_tok) { 1312 if (!found_auth_tok) {
1200 ecryptfs_printk(KERN_ERR, "Could not find authentication " 1313 ecryptfs_printk(KERN_ERR, "Could not find a usable "
1201 "token on temporary list for sig [%.*s]\n", 1314 "authentication token\n");
1202 ECRYPTFS_SIG_SIZE_HEX, sig);
1203 rc = -EIO; 1315 rc = -EIO;
1204 goto out_wipe_list; 1316 goto out_wipe_list;
1205 } 1317 }
1206leave_list: 1318found_matching_auth_tok:
1207 rc = -ENOTSUPP;
1208 if (candidate_auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) { 1319 if (candidate_auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) {
1209 memcpy(&(candidate_auth_tok->token.private_key), 1320 memcpy(&(candidate_auth_tok->token.private_key),
1210 &(chosen_auth_tok->token.private_key), 1321 &(matching_auth_tok->token.private_key),
1211 sizeof(struct ecryptfs_private_key)); 1322 sizeof(struct ecryptfs_private_key));
1212 rc = decrypt_pki_encrypted_session_key(mount_crypt_stat, 1323 rc = decrypt_pki_encrypted_session_key(candidate_auth_tok,
1213 candidate_auth_tok,
1214 crypt_stat); 1324 crypt_stat);
1215 } else if (candidate_auth_tok->token_type == ECRYPTFS_PASSWORD) { 1325 } else if (candidate_auth_tok->token_type == ECRYPTFS_PASSWORD) {
1216 memcpy(&(candidate_auth_tok->token.password), 1326 memcpy(&(candidate_auth_tok->token.password),
1217 &(chosen_auth_tok->token.password), 1327 &(matching_auth_tok->token.password),
1218 sizeof(struct ecryptfs_password)); 1328 sizeof(struct ecryptfs_password));
1219 rc = decrypt_session_key(candidate_auth_tok, crypt_stat); 1329 rc = decrypt_passphrase_encrypted_session_key(
1330 candidate_auth_tok, crypt_stat);
1220 } 1331 }
1221 if (rc) { 1332 if (rc) {
1222 ecryptfs_printk(KERN_ERR, "Error decrypting the " 1333 struct ecryptfs_auth_tok_list_item *auth_tok_list_item_tmp;
1223 "session key; rc = [%d]\n", rc); 1334
1224 goto out_wipe_list; 1335 ecryptfs_printk(KERN_WARNING, "Error decrypting the "
1336 "session key for authentication token with sig "
1337 "[%.*s]; rc = [%d]. Removing auth tok "
1338 "candidate from the list and searching for "
1339 "the next match.\n", candidate_auth_tok_sig,
1340 ECRYPTFS_SIG_SIZE_HEX, rc);
1341 list_for_each_entry_safe(auth_tok_list_item,
1342 auth_tok_list_item_tmp,
1343 &auth_tok_list, list) {
1344 if (candidate_auth_tok
1345 == &auth_tok_list_item->auth_tok) {
1346 list_del(&auth_tok_list_item->list);
1347 kmem_cache_free(
1348 ecryptfs_auth_tok_list_item_cache,
1349 auth_tok_list_item);
1350 goto find_next_matching_auth_tok;
1351 }
1352 }
1353 BUG();
1225 } 1354 }
1226 rc = ecryptfs_compute_root_iv(crypt_stat); 1355 rc = ecryptfs_compute_root_iv(crypt_stat);
1227 if (rc) { 1356 if (rc) {
@@ -1240,6 +1369,7 @@ out_wipe_list:
1240out: 1369out:
1241 return rc; 1370 return rc;
1242} 1371}
1372
1243static int 1373static int
1244pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok, 1374pki_encrypt_session_key(struct ecryptfs_auth_tok *auth_tok,
1245 struct ecryptfs_crypt_stat *crypt_stat, 1375 struct ecryptfs_crypt_stat *crypt_stat,
@@ -1291,15 +1421,15 @@ out:
1291 * Returns zero on success; non-zero on error. 1421 * Returns zero on success; non-zero on error.
1292 */ 1422 */
1293static int 1423static int
1294write_tag_1_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok, 1424write_tag_1_packet(char *dest, size_t *remaining_bytes,
1425 struct ecryptfs_auth_tok *auth_tok,
1295 struct ecryptfs_crypt_stat *crypt_stat, 1426 struct ecryptfs_crypt_stat *crypt_stat,
1296 struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
1297 struct ecryptfs_key_record *key_rec, size_t *packet_size) 1427 struct ecryptfs_key_record *key_rec, size_t *packet_size)
1298{ 1428{
1299 size_t i; 1429 size_t i;
1300 size_t encrypted_session_key_valid = 0; 1430 size_t encrypted_session_key_valid = 0;
1301 size_t key_rec_size;
1302 size_t packet_size_length; 1431 size_t packet_size_length;
1432 size_t max_packet_size;
1303 int rc = 0; 1433 int rc = 0;
1304 1434
1305 (*packet_size) = 0; 1435 (*packet_size) = 0;
@@ -1329,37 +1459,23 @@ write_tag_1_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok,
1329 ecryptfs_dump_hex(key_rec->enc_key, key_rec->enc_key_size); 1459 ecryptfs_dump_hex(key_rec->enc_key, key_rec->enc_key_size);
1330 } 1460 }
1331encrypted_session_key_set: 1461encrypted_session_key_set:
1332 /* Now we have a valid key_rec. Append it to the 1462 /* This format is inspired by OpenPGP; see RFC 2440
1333 * key_rec set. */ 1463 * packet tag 1 */
1334 key_rec_size = (sizeof(struct ecryptfs_key_record) 1464 max_packet_size = (1 /* Tag 1 identifier */
1335 - ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES 1465 + 3 /* Max Tag 1 packet size */
1336 + (key_rec->enc_key_size)); 1466 + 1 /* Version */
1337 /* TODO: Include a packet size limit as a parameter to this 1467 + ECRYPTFS_SIG_SIZE /* Key identifier */
1338 * function once we have multi-packet headers (for versions 1468 + 1 /* Cipher identifier */
1339 * later than 0.1 */ 1469 + key_rec->enc_key_size); /* Encrypted key size */
1340 if (key_rec_size >= ECRYPTFS_MAX_KEYSET_SIZE) { 1470 if (max_packet_size > (*remaining_bytes)) {
1341 ecryptfs_printk(KERN_ERR, "Keyset too large\n"); 1471 printk(KERN_ERR "Packet length larger than maximum allowable; "
1342 rc = -EINVAL; 1472 "need up to [%d] bytes, but there are only [%d] "
1343 goto out; 1473 "available\n", max_packet_size, (*remaining_bytes));
1344 }
1345 /* ***** TAG 1 Packet Format *****
1346 * | version number | 1 byte |
1347 * | key ID | 8 bytes |
1348 * | public key algorithm | 1 byte |
1349 * | encrypted session key | arbitrary |
1350 */
1351 if ((0x02 + ECRYPTFS_SIG_SIZE + key_rec->enc_key_size) >= max) {
1352 ecryptfs_printk(KERN_ERR,
1353 "Authentication token is too large\n");
1354 rc = -EINVAL; 1474 rc = -EINVAL;
1355 goto out; 1475 goto out;
1356 } 1476 }
1357 dest[(*packet_size)++] = ECRYPTFS_TAG_1_PACKET_TYPE; 1477 dest[(*packet_size)++] = ECRYPTFS_TAG_1_PACKET_TYPE;
1358 /* This format is inspired by OpenPGP; see RFC 2440 1478 rc = write_packet_length(&dest[(*packet_size)], (max_packet_size - 4),
1359 * packet tag 1 */
1360 rc = write_packet_length(&dest[(*packet_size)],
1361 (0x02 + ECRYPTFS_SIG_SIZE +
1362 key_rec->enc_key_size),
1363 &packet_size_length); 1479 &packet_size_length);
1364 if (rc) { 1480 if (rc) {
1365 ecryptfs_printk(KERN_ERR, "Error generating tag 1 packet " 1481 ecryptfs_printk(KERN_ERR, "Error generating tag 1 packet "
@@ -1377,6 +1493,8 @@ encrypted_session_key_set:
1377out: 1493out:
1378 if (rc) 1494 if (rc)
1379 (*packet_size) = 0; 1495 (*packet_size) = 0;
1496 else
1497 (*remaining_bytes) -= (*packet_size);
1380 return rc; 1498 return rc;
1381} 1499}
1382 1500
@@ -1448,19 +1566,22 @@ write_tag_11_packet(char *dest, int max, char *contents, size_t contents_length,
1448 * Returns zero on success; non-zero on error. 1566 * Returns zero on success; non-zero on error.
1449 */ 1567 */
1450static int 1568static int
1451write_tag_3_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok, 1569write_tag_3_packet(char *dest, size_t *remaining_bytes,
1570 struct ecryptfs_auth_tok *auth_tok,
1452 struct ecryptfs_crypt_stat *crypt_stat, 1571 struct ecryptfs_crypt_stat *crypt_stat,
1453 struct ecryptfs_key_record *key_rec, size_t *packet_size) 1572 struct ecryptfs_key_record *key_rec, size_t *packet_size)
1454{ 1573{
1455 size_t i; 1574 size_t i;
1456 size_t encrypted_session_key_valid = 0; 1575 size_t encrypted_session_key_valid = 0;
1457 char session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES]; 1576 char session_key_encryption_key[ECRYPTFS_MAX_KEY_BYTES];
1458 struct scatterlist dest_sg[2]; 1577 struct scatterlist dst_sg;
1459 struct scatterlist src_sg[2]; 1578 struct scatterlist src_sg;
1460 struct mutex *tfm_mutex = NULL; 1579 struct mutex *tfm_mutex = NULL;
1461 size_t key_rec_size;
1462 size_t packet_size_length;
1463 size_t cipher_code; 1580 size_t cipher_code;
1581 size_t packet_size_length;
1582 size_t max_packet_size;
1583 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
1584 crypt_stat->mount_crypt_stat;
1464 struct blkcipher_desc desc = { 1585 struct blkcipher_desc desc = {
1465 .tfm = NULL, 1586 .tfm = NULL,
1466 .flags = CRYPTO_TFM_REQ_MAY_SLEEP 1587 .flags = CRYPTO_TFM_REQ_MAY_SLEEP
@@ -1470,16 +1591,25 @@ write_tag_3_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok,
1470 (*packet_size) = 0; 1591 (*packet_size) = 0;
1471 ecryptfs_from_hex(key_rec->sig, auth_tok->token.password.signature, 1592 ecryptfs_from_hex(key_rec->sig, auth_tok->token.password.signature,
1472 ECRYPTFS_SIG_SIZE); 1593 ECRYPTFS_SIG_SIZE);
1473 encrypted_session_key_valid = 0; 1594 rc = ecryptfs_get_tfm_and_mutex_for_cipher_name(&desc.tfm, &tfm_mutex,
1474 for (i = 0; i < crypt_stat->key_size; i++) 1595 crypt_stat->cipher);
1475 encrypted_session_key_valid |= 1596 if (unlikely(rc)) {
1476 auth_tok->session_key.encrypted_key[i]; 1597 printk(KERN_ERR "Internal error whilst attempting to get "
1477 if (encrypted_session_key_valid) { 1598 "tfm and mutex for cipher name [%s]; rc = [%d]\n",
1478 memcpy(key_rec->enc_key, 1599 crypt_stat->cipher, rc);
1479 auth_tok->session_key.encrypted_key, 1600 goto out;
1480 auth_tok->session_key.encrypted_key_size); 1601 }
1481 goto encrypted_session_key_set; 1602 if (mount_crypt_stat->global_default_cipher_key_size == 0) {
1603 struct blkcipher_alg *alg = crypto_blkcipher_alg(desc.tfm);
1604
1605 printk(KERN_WARNING "No key size specified at mount; "
1606 "defaulting to [%d]\n", alg->max_keysize);
1607 mount_crypt_stat->global_default_cipher_key_size =
1608 alg->max_keysize;
1482 } 1609 }
1610 if (crypt_stat->key_size == 0)
1611 crypt_stat->key_size =
1612 mount_crypt_stat->global_default_cipher_key_size;
1483 if (auth_tok->session_key.encrypted_key_size == 0) 1613 if (auth_tok->session_key.encrypted_key_size == 0)
1484 auth_tok->session_key.encrypted_key_size = 1614 auth_tok->session_key.encrypted_key_size =
1485 crypt_stat->key_size; 1615 crypt_stat->key_size;
@@ -1487,9 +1617,24 @@ write_tag_3_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok,
1487 && strcmp("aes", crypt_stat->cipher) == 0) { 1617 && strcmp("aes", crypt_stat->cipher) == 0) {
1488 memset((crypt_stat->key + 24), 0, 8); 1618 memset((crypt_stat->key + 24), 0, 8);
1489 auth_tok->session_key.encrypted_key_size = 32; 1619 auth_tok->session_key.encrypted_key_size = 32;
1490 } 1620 } else
1621 auth_tok->session_key.encrypted_key_size = crypt_stat->key_size;
1491 key_rec->enc_key_size = 1622 key_rec->enc_key_size =
1492 auth_tok->session_key.encrypted_key_size; 1623 auth_tok->session_key.encrypted_key_size;
1624 encrypted_session_key_valid = 0;
1625 for (i = 0; i < auth_tok->session_key.encrypted_key_size; i++)
1626 encrypted_session_key_valid |=
1627 auth_tok->session_key.encrypted_key[i];
1628 if (encrypted_session_key_valid) {
1629 ecryptfs_printk(KERN_DEBUG, "encrypted_session_key_valid != 0; "
1630 "using auth_tok->session_key.encrypted_key, "
1631 "where key_rec->enc_key_size = [%d]\n",
1632 key_rec->enc_key_size);
1633 memcpy(key_rec->enc_key,
1634 auth_tok->session_key.encrypted_key,
1635 key_rec->enc_key_size);
1636 goto encrypted_session_key_set;
1637 }
1493 if (auth_tok->token.password.flags & 1638 if (auth_tok->token.password.flags &
1494 ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET) { 1639 ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET) {
1495 ecryptfs_printk(KERN_DEBUG, "Using previously generated " 1640 ecryptfs_printk(KERN_DEBUG, "Using previously generated "
@@ -1508,54 +1653,32 @@ write_tag_3_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok,
1508 ecryptfs_printk(KERN_DEBUG, "Session key encryption key:\n"); 1653 ecryptfs_printk(KERN_DEBUG, "Session key encryption key:\n");
1509 ecryptfs_dump_hex(session_key_encryption_key, 16); 1654 ecryptfs_dump_hex(session_key_encryption_key, 16);
1510 } 1655 }
1511 rc = virt_to_scatterlist(crypt_stat->key, 1656 if ((rc = virt_to_scatterlist(crypt_stat->key,
1512 key_rec->enc_key_size, src_sg, 2); 1657 key_rec->enc_key_size, &src_sg, 1))
1513 if (!rc) { 1658 != 1) {
1514 ecryptfs_printk(KERN_ERR, "Error generating scatterlist " 1659 ecryptfs_printk(KERN_ERR, "Error generating scatterlist "
1515 "for crypt_stat session key\n"); 1660 "for crypt_stat session key; expected rc = 1; "
1661 "got rc = [%d]. key_rec->enc_key_size = [%d]\n",
1662 rc, key_rec->enc_key_size);
1516 rc = -ENOMEM; 1663 rc = -ENOMEM;
1517 goto out; 1664 goto out;
1518 } 1665 }
1519 rc = virt_to_scatterlist(key_rec->enc_key, 1666 if ((rc = virt_to_scatterlist(key_rec->enc_key,
1520 key_rec->enc_key_size, dest_sg, 2); 1667 key_rec->enc_key_size, &dst_sg, 1))
1521 if (!rc) { 1668 != 1) {
1522 ecryptfs_printk(KERN_ERR, "Error generating scatterlist " 1669 ecryptfs_printk(KERN_ERR, "Error generating scatterlist "
1523 "for crypt_stat encrypted session key\n"); 1670 "for crypt_stat encrypted session key; "
1671 "expected rc = 1; got rc = [%d]. "
1672 "key_rec->enc_key_size = [%d]\n", rc,
1673 key_rec->enc_key_size);
1524 rc = -ENOMEM; 1674 rc = -ENOMEM;
1525 goto out; 1675 goto out;
1526 } 1676 }
1527 if (!strcmp(crypt_stat->cipher, 1677 mutex_lock(tfm_mutex);
1528 crypt_stat->mount_crypt_stat->global_default_cipher_name)
1529 && crypt_stat->mount_crypt_stat->global_key_tfm) {
1530 desc.tfm = crypt_stat->mount_crypt_stat->global_key_tfm;
1531 tfm_mutex = &crypt_stat->mount_crypt_stat->global_key_tfm_mutex;
1532 } else {
1533 char *full_alg_name;
1534
1535 rc = ecryptfs_crypto_api_algify_cipher_name(&full_alg_name,
1536 crypt_stat->cipher,
1537 "ecb");
1538 if (rc)
1539 goto out;
1540 desc.tfm = crypto_alloc_blkcipher(full_alg_name, 0,
1541 CRYPTO_ALG_ASYNC);
1542 kfree(full_alg_name);
1543 if (IS_ERR(desc.tfm)) {
1544 rc = PTR_ERR(desc.tfm);
1545 ecryptfs_printk(KERN_ERR, "Could not initialize crypto "
1546 "context for cipher [%s]; rc = [%d]\n",
1547 crypt_stat->cipher, rc);
1548 goto out;
1549 }
1550 crypto_blkcipher_set_flags(desc.tfm, CRYPTO_TFM_REQ_WEAK_KEY);
1551 }
1552 if (tfm_mutex)
1553 mutex_lock(tfm_mutex);
1554 rc = crypto_blkcipher_setkey(desc.tfm, session_key_encryption_key, 1678 rc = crypto_blkcipher_setkey(desc.tfm, session_key_encryption_key,
1555 crypt_stat->key_size); 1679 crypt_stat->key_size);
1556 if (rc < 0) { 1680 if (rc < 0) {
1557 if (tfm_mutex) 1681 mutex_unlock(tfm_mutex);
1558 mutex_unlock(tfm_mutex);
1559 ecryptfs_printk(KERN_ERR, "Error setting key for crypto " 1682 ecryptfs_printk(KERN_ERR, "Error setting key for crypto "
1560 "context; rc = [%d]\n", rc); 1683 "context; rc = [%d]\n", rc);
1561 goto out; 1684 goto out;
@@ -1563,56 +1686,53 @@ write_tag_3_packet(char *dest, size_t max, struct ecryptfs_auth_tok *auth_tok,
1563 rc = 0; 1686 rc = 0;
1564 ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes of the key\n", 1687 ecryptfs_printk(KERN_DEBUG, "Encrypting [%d] bytes of the key\n",
1565 crypt_stat->key_size); 1688 crypt_stat->key_size);
1566 rc = crypto_blkcipher_encrypt(&desc, dest_sg, src_sg, 1689 rc = crypto_blkcipher_encrypt(&desc, &dst_sg, &src_sg,
1567 (*key_rec).enc_key_size); 1690 (*key_rec).enc_key_size);
1691 mutex_unlock(tfm_mutex);
1568 if (rc) { 1692 if (rc) {
1569 printk(KERN_ERR "Error encrypting; rc = [%d]\n", rc); 1693 printk(KERN_ERR "Error encrypting; rc = [%d]\n", rc);
1570 goto out; 1694 goto out;
1571 } 1695 }
1572 if (tfm_mutex)
1573 mutex_unlock(tfm_mutex);
1574 ecryptfs_printk(KERN_DEBUG, "This should be the encrypted key:\n"); 1696 ecryptfs_printk(KERN_DEBUG, "This should be the encrypted key:\n");
1575 if (ecryptfs_verbosity > 0) 1697 if (ecryptfs_verbosity > 0) {
1698 ecryptfs_printk(KERN_DEBUG, "EFEK of size [%d]:\n",
1699 key_rec->enc_key_size);
1576 ecryptfs_dump_hex(key_rec->enc_key, 1700 ecryptfs_dump_hex(key_rec->enc_key,
1577 key_rec->enc_key_size); 1701 key_rec->enc_key_size);
1578encrypted_session_key_set:
1579 /* Now we have a valid key_rec. Append it to the
1580 * key_rec set. */
1581 key_rec_size = (sizeof(struct ecryptfs_key_record)
1582 - ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES
1583 + (key_rec->enc_key_size));
1584 /* TODO: Include a packet size limit as a parameter to this
1585 * function once we have multi-packet headers (for versions
1586 * later than 0.1 */
1587 if (key_rec_size >= ECRYPTFS_MAX_KEYSET_SIZE) {
1588 ecryptfs_printk(KERN_ERR, "Keyset too large\n");
1589 rc = -EINVAL;
1590 goto out;
1591 } 1702 }
1592 /* TODO: Packet size limit */ 1703encrypted_session_key_set:
1593 /* We have 5 bytes of surrounding packet data */ 1704 /* This format is inspired by OpenPGP; see RFC 2440
1594 if ((0x05 + ECRYPTFS_SALT_SIZE 1705 * packet tag 3 */
1595 + key_rec->enc_key_size) >= max) { 1706 max_packet_size = (1 /* Tag 3 identifier */
1596 ecryptfs_printk(KERN_ERR, "Authentication token is too " 1707 + 3 /* Max Tag 3 packet size */
1597 "large\n"); 1708 + 1 /* Version */
1709 + 1 /* Cipher code */
1710 + 1 /* S2K specifier */
1711 + 1 /* Hash identifier */
1712 + ECRYPTFS_SALT_SIZE /* Salt */
1713 + 1 /* Hash iterations */
1714 + key_rec->enc_key_size); /* Encrypted key size */
1715 if (max_packet_size > (*remaining_bytes)) {
1716 printk(KERN_ERR "Packet too large; need up to [%d] bytes, but "
1717 "there are only [%d] available\n", max_packet_size,
1718 (*remaining_bytes));
1598 rc = -EINVAL; 1719 rc = -EINVAL;
1599 goto out; 1720 goto out;
1600 } 1721 }
1601 /* This format is inspired by OpenPGP; see RFC 2440
1602 * packet tag 3 */
1603 dest[(*packet_size)++] = ECRYPTFS_TAG_3_PACKET_TYPE; 1722 dest[(*packet_size)++] = ECRYPTFS_TAG_3_PACKET_TYPE;
1604 /* ver+cipher+s2k+hash+salt+iter+enc_key */ 1723 /* Chop off the Tag 3 identifier(1) and Tag 3 packet size(3)
1605 rc = write_packet_length(&dest[(*packet_size)], 1724 * to get the number of octets in the actual Tag 3 packet */
1606 (0x05 + ECRYPTFS_SALT_SIZE 1725 rc = write_packet_length(&dest[(*packet_size)], (max_packet_size - 4),
1607 + key_rec->enc_key_size),
1608 &packet_size_length); 1726 &packet_size_length);
1609 if (rc) { 1727 if (rc) {
1610 ecryptfs_printk(KERN_ERR, "Error generating tag 3 packet " 1728 printk(KERN_ERR "Error generating tag 3 packet header; cannot "
1611 "header; cannot generate packet length\n"); 1729 "generate packet length. rc = [%d]\n", rc);
1612 goto out; 1730 goto out;
1613 } 1731 }
1614 (*packet_size) += packet_size_length; 1732 (*packet_size) += packet_size_length;
1615 dest[(*packet_size)++] = 0x04; /* version 4 */ 1733 dest[(*packet_size)++] = 0x04; /* version 4 */
1734 /* TODO: Break from RFC2440 so that arbitrary ciphers can be
1735 * specified with strings */
1616 cipher_code = ecryptfs_code_for_cipher_string(crypt_stat); 1736 cipher_code = ecryptfs_code_for_cipher_string(crypt_stat);
1617 if (cipher_code == 0) { 1737 if (cipher_code == 0) {
1618 ecryptfs_printk(KERN_WARNING, "Unable to generate code for " 1738 ecryptfs_printk(KERN_WARNING, "Unable to generate code for "
@@ -1631,10 +1751,10 @@ encrypted_session_key_set:
1631 key_rec->enc_key_size); 1751 key_rec->enc_key_size);
1632 (*packet_size) += key_rec->enc_key_size; 1752 (*packet_size) += key_rec->enc_key_size;
1633out: 1753out:
1634 if (desc.tfm && !tfm_mutex)
1635 crypto_free_blkcipher(desc.tfm);
1636 if (rc) 1754 if (rc)
1637 (*packet_size) = 0; 1755 (*packet_size) = 0;
1756 else
1757 (*remaining_bytes) -= (*packet_size);
1638 return rc; 1758 return rc;
1639} 1759}
1640 1760
@@ -1662,24 +1782,43 @@ ecryptfs_generate_key_packet_set(char *dest_base,
1662 size_t max) 1782 size_t max)
1663{ 1783{
1664 struct ecryptfs_auth_tok *auth_tok; 1784 struct ecryptfs_auth_tok *auth_tok;
1785 struct ecryptfs_global_auth_tok *global_auth_tok;
1665 struct ecryptfs_mount_crypt_stat *mount_crypt_stat = 1786 struct ecryptfs_mount_crypt_stat *mount_crypt_stat =
1666 &ecryptfs_superblock_to_private( 1787 &ecryptfs_superblock_to_private(
1667 ecryptfs_dentry->d_sb)->mount_crypt_stat; 1788 ecryptfs_dentry->d_sb)->mount_crypt_stat;
1668 size_t written; 1789 size_t written;
1669 struct ecryptfs_key_record *key_rec; 1790 struct ecryptfs_key_record *key_rec;
1791 struct ecryptfs_key_sig *key_sig;
1670 int rc = 0; 1792 int rc = 0;
1671 1793
1672 (*len) = 0; 1794 (*len) = 0;
1795 mutex_lock(&crypt_stat->keysig_list_mutex);
1673 key_rec = kmem_cache_alloc(ecryptfs_key_record_cache, GFP_KERNEL); 1796 key_rec = kmem_cache_alloc(ecryptfs_key_record_cache, GFP_KERNEL);
1674 if (!key_rec) { 1797 if (!key_rec) {
1675 rc = -ENOMEM; 1798 rc = -ENOMEM;
1676 goto out; 1799 goto out;
1677 } 1800 }
1678 if (mount_crypt_stat->global_auth_tok) { 1801 list_for_each_entry(key_sig, &crypt_stat->keysig_list,
1679 auth_tok = mount_crypt_stat->global_auth_tok; 1802 crypt_stat_list) {
1803 memset(key_rec, 0, sizeof(*key_rec));
1804 rc = ecryptfs_find_global_auth_tok_for_sig(&global_auth_tok,
1805 mount_crypt_stat,
1806 key_sig->keysig);
1807 if (rc) {
1808 printk(KERN_ERR "Error attempting to get the global "
1809 "auth_tok; rc = [%d]\n", rc);
1810 goto out_free;
1811 }
1812 if (global_auth_tok->flags & ECRYPTFS_AUTH_TOK_INVALID) {
1813 printk(KERN_WARNING
1814 "Skipping invalid auth tok with sig = [%s]\n",
1815 global_auth_tok->sig);
1816 continue;
1817 }
1818 auth_tok = global_auth_tok->global_auth_tok;
1680 if (auth_tok->token_type == ECRYPTFS_PASSWORD) { 1819 if (auth_tok->token_type == ECRYPTFS_PASSWORD) {
1681 rc = write_tag_3_packet((dest_base + (*len)), 1820 rc = write_tag_3_packet((dest_base + (*len)),
1682 max, auth_tok, 1821 &max, auth_tok,
1683 crypt_stat, key_rec, 1822 crypt_stat, key_rec,
1684 &written); 1823 &written);
1685 if (rc) { 1824 if (rc) {
@@ -1689,10 +1828,9 @@ ecryptfs_generate_key_packet_set(char *dest_base,
1689 } 1828 }
1690 (*len) += written; 1829 (*len) += written;
1691 /* Write auth tok signature packet */ 1830 /* Write auth tok signature packet */
1692 rc = write_tag_11_packet( 1831 rc = write_tag_11_packet((dest_base + (*len)), &max,
1693 (dest_base + (*len)), 1832 key_rec->sig,
1694 (max - (*len)), 1833 ECRYPTFS_SIG_SIZE, &written);
1695 key_rec->sig, ECRYPTFS_SIG_SIZE, &written);
1696 if (rc) { 1834 if (rc) {
1697 ecryptfs_printk(KERN_ERR, "Error writing " 1835 ecryptfs_printk(KERN_ERR, "Error writing "
1698 "auth tok signature packet\n"); 1836 "auth tok signature packet\n");
@@ -1701,9 +1839,8 @@ ecryptfs_generate_key_packet_set(char *dest_base,
1701 (*len) += written; 1839 (*len) += written;
1702 } else if (auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) { 1840 } else if (auth_tok->token_type == ECRYPTFS_PRIVATE_KEY) {
1703 rc = write_tag_1_packet(dest_base + (*len), 1841 rc = write_tag_1_packet(dest_base + (*len),
1704 max, auth_tok, 1842 &max, auth_tok,
1705 crypt_stat,mount_crypt_stat, 1843 crypt_stat, key_rec, &written);
1706 key_rec, &written);
1707 if (rc) { 1844 if (rc) {
1708 ecryptfs_printk(KERN_WARNING, "Error " 1845 ecryptfs_printk(KERN_WARNING, "Error "
1709 "writing tag 1 packet\n"); 1846 "writing tag 1 packet\n");
@@ -1716,19 +1853,69 @@ ecryptfs_generate_key_packet_set(char *dest_base,
1716 rc = -EINVAL; 1853 rc = -EINVAL;
1717 goto out_free; 1854 goto out_free;
1718 } 1855 }
1719 } else 1856 }
1720 BUG(); 1857 if (likely(max > 0)) {
1721 if (likely((max - (*len)) > 0)) {
1722 dest_base[(*len)] = 0x00; 1858 dest_base[(*len)] = 0x00;
1723 } else { 1859 } else {
1724 ecryptfs_printk(KERN_ERR, "Error writing boundary byte\n"); 1860 ecryptfs_printk(KERN_ERR, "Error writing boundary byte\n");
1725 rc = -EIO; 1861 rc = -EIO;
1726 } 1862 }
1727
1728out_free: 1863out_free:
1729 kmem_cache_free(ecryptfs_key_record_cache, key_rec); 1864 kmem_cache_free(ecryptfs_key_record_cache, key_rec);
1730out: 1865out:
1731 if (rc) 1866 if (rc)
1732 (*len) = 0; 1867 (*len) = 0;
1868 mutex_unlock(&crypt_stat->keysig_list_mutex);
1869 return rc;
1870}
1871
1872struct kmem_cache *ecryptfs_key_sig_cache;
1873
1874int ecryptfs_add_keysig(struct ecryptfs_crypt_stat *crypt_stat, char *sig)
1875{
1876 struct ecryptfs_key_sig *new_key_sig;
1877 int rc = 0;
1878
1879 new_key_sig = kmem_cache_alloc(ecryptfs_key_sig_cache, GFP_KERNEL);
1880 if (!new_key_sig) {
1881 rc = -ENOMEM;
1882 printk(KERN_ERR
1883 "Error allocating from ecryptfs_key_sig_cache\n");
1884 goto out;
1885 }
1886 memcpy(new_key_sig->keysig, sig, ECRYPTFS_SIG_SIZE_HEX);
1887 mutex_lock(&crypt_stat->keysig_list_mutex);
1888 list_add(&new_key_sig->crypt_stat_list, &crypt_stat->keysig_list);
1889 mutex_unlock(&crypt_stat->keysig_list_mutex);
1890out:
1733 return rc; 1891 return rc;
1734} 1892}
1893
1894struct kmem_cache *ecryptfs_global_auth_tok_cache;
1895
1896int
1897ecryptfs_add_global_auth_tok(struct ecryptfs_mount_crypt_stat *mount_crypt_stat,
1898 char *sig)
1899{
1900 struct ecryptfs_global_auth_tok *new_auth_tok;
1901 int rc = 0;
1902
1903 new_auth_tok = kmem_cache_alloc(ecryptfs_global_auth_tok_cache,
1904 GFP_KERNEL);
1905 if (!new_auth_tok) {
1906 rc = -ENOMEM;
1907 printk(KERN_ERR "Error allocating from "
1908 "ecryptfs_global_auth_tok_cache\n");
1909 goto out;
1910 }
1911 memcpy(new_auth_tok->sig, sig, ECRYPTFS_SIG_SIZE_HEX);
1912 new_auth_tok->sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
1913 mutex_lock(&mount_crypt_stat->global_auth_tok_list_mutex);
1914 list_add(&new_auth_tok->mount_crypt_stat_list,
1915 &mount_crypt_stat->global_auth_tok_list);
1916 mount_crypt_stat->num_global_auth_toks++;
1917 mutex_unlock(&mount_crypt_stat->global_auth_tok_list_mutex);
1918out:
1919 return rc;
1920}
1921
diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
index a98497264fe8..6e2170c96c02 100644
--- a/fs/ecryptfs/main.c
+++ b/fs/ecryptfs/main.c
@@ -179,38 +179,40 @@ static match_table_t tokens = {
179 {ecryptfs_opt_err, NULL} 179 {ecryptfs_opt_err, NULL}
180}; 180};
181 181
182/** 182static int ecryptfs_init_global_auth_toks(
183 * ecryptfs_verify_version 183 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
184 * @version: The version number to confirm
185 *
186 * Returns zero on good version; non-zero otherwise
187 */
188static int ecryptfs_verify_version(u16 version)
189{ 184{
185 struct ecryptfs_global_auth_tok *global_auth_tok;
190 int rc = 0; 186 int rc = 0;
191 unsigned char major; 187
192 unsigned char minor; 188 list_for_each_entry(global_auth_tok,
193 189 &mount_crypt_stat->global_auth_tok_list,
194 major = ((version >> 8) & 0xFF); 190 mount_crypt_stat_list) {
195 minor = (version & 0xFF); 191 if ((rc = ecryptfs_keyring_auth_tok_for_sig(
196 if (major != ECRYPTFS_VERSION_MAJOR) { 192 &global_auth_tok->global_auth_tok_key,
197 ecryptfs_printk(KERN_ERR, "Major version number mismatch. " 193 &global_auth_tok->global_auth_tok,
198 "Expected [%d]; got [%d]\n", 194 global_auth_tok->sig))) {
199 ECRYPTFS_VERSION_MAJOR, major); 195 printk(KERN_ERR "Could not find valid key in user "
200 rc = -EINVAL; 196 "session keyring for sig specified in mount "
201 goto out; 197 "option: [%s]\n", global_auth_tok->sig);
202 } 198 global_auth_tok->flags |= ECRYPTFS_AUTH_TOK_INVALID;
203 if (minor != ECRYPTFS_VERSION_MINOR) { 199 rc = 0;
204 ecryptfs_printk(KERN_ERR, "Minor version number mismatch. " 200 } else
205 "Expected [%d]; got [%d]\n", 201 global_auth_tok->flags &= ~ECRYPTFS_AUTH_TOK_INVALID;
206 ECRYPTFS_VERSION_MINOR, minor);
207 rc = -EINVAL;
208 goto out;
209 } 202 }
210out:
211 return rc; 203 return rc;
212} 204}
213 205
206static void ecryptfs_init_mount_crypt_stat(
207 struct ecryptfs_mount_crypt_stat *mount_crypt_stat)
208{
209 memset((void *)mount_crypt_stat, 0,
210 sizeof(struct ecryptfs_mount_crypt_stat));
211 INIT_LIST_HEAD(&mount_crypt_stat->global_auth_tok_list);
212 mutex_init(&mount_crypt_stat->global_auth_tok_list_mutex);
213 mount_crypt_stat->flags |= ECRYPTFS_MOUNT_CRYPT_STAT_INITIALIZED;
214}
215
214/** 216/**
215 * ecryptfs_parse_options 217 * ecryptfs_parse_options
216 * @sb: The ecryptfs super block 218 * @sb: The ecryptfs super block
@@ -264,14 +266,13 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
264 case ecryptfs_opt_sig: 266 case ecryptfs_opt_sig:
265 case ecryptfs_opt_ecryptfs_sig: 267 case ecryptfs_opt_ecryptfs_sig:
266 sig_src = args[0].from; 268 sig_src = args[0].from;
267 sig_dst = 269 rc = ecryptfs_add_global_auth_tok(mount_crypt_stat,
268 mount_crypt_stat->global_auth_tok_sig; 270 sig_src);
269 memcpy(sig_dst, sig_src, ECRYPTFS_SIG_SIZE_HEX); 271 if (rc) {
270 sig_dst[ECRYPTFS_SIG_SIZE_HEX] = '\0'; 272 printk(KERN_ERR "Error attempting to register "
271 ecryptfs_printk(KERN_DEBUG, 273 "global sig; rc = [%d]\n", rc);
272 "The mount_crypt_stat " 274 goto out;
273 "global_auth_tok_sig set to: " 275 }
274 "[%s]\n", sig_dst);
275 sig_set = 1; 276 sig_set = 1;
276 break; 277 break;
277 case ecryptfs_opt_debug: 278 case ecryptfs_opt_debug:
@@ -358,55 +359,21 @@ static int ecryptfs_parse_options(struct super_block *sb, char *options)
358 if (!cipher_key_bytes_set) { 359 if (!cipher_key_bytes_set) {
359 mount_crypt_stat->global_default_cipher_key_size = 0; 360 mount_crypt_stat->global_default_cipher_key_size = 0;
360 } 361 }
361 rc = ecryptfs_process_cipher( 362 if ((rc = ecryptfs_add_new_key_tfm(
362 &mount_crypt_stat->global_key_tfm, 363 NULL, mount_crypt_stat->global_default_cipher_name,
363 mount_crypt_stat->global_default_cipher_name, 364 mount_crypt_stat->global_default_cipher_key_size))) {
364 &mount_crypt_stat->global_default_cipher_key_size); 365 printk(KERN_ERR "Error attempting to initialize cipher with "
365 if (rc) { 366 "name = [%s] and key size = [%d]; rc = [%d]\n",
366 printk(KERN_ERR "Error attempting to initialize cipher [%s] "
367 "with key size [%Zd] bytes; rc = [%d]\n",
368 mount_crypt_stat->global_default_cipher_name, 367 mount_crypt_stat->global_default_cipher_name,
369 mount_crypt_stat->global_default_cipher_key_size, rc); 368 mount_crypt_stat->global_default_cipher_key_size, rc);
370 mount_crypt_stat->global_key_tfm = NULL;
371 mount_crypt_stat->global_auth_tok_key = NULL;
372 rc = -EINVAL;
373 goto out;
374 }
375 mutex_init(&mount_crypt_stat->global_key_tfm_mutex);
376 ecryptfs_printk(KERN_DEBUG, "Requesting the key with description: "
377 "[%s]\n", mount_crypt_stat->global_auth_tok_sig);
378 /* The reference to this key is held until umount is done The
379 * call to key_put is done in ecryptfs_put_super() */
380 auth_tok_key = request_key(&key_type_user,
381 mount_crypt_stat->global_auth_tok_sig,
382 NULL);
383 if (!auth_tok_key || IS_ERR(auth_tok_key)) {
384 ecryptfs_printk(KERN_ERR, "Could not find key with "
385 "description: [%s]\n",
386 mount_crypt_stat->global_auth_tok_sig);
387 process_request_key_err(PTR_ERR(auth_tok_key));
388 rc = -EINVAL; 369 rc = -EINVAL;
389 goto out; 370 goto out;
390 } 371 }
391 auth_tok = ecryptfs_get_key_payload_data(auth_tok_key); 372 if ((rc = ecryptfs_init_global_auth_toks(mount_crypt_stat))) {
392 if (ecryptfs_verify_version(auth_tok->version)) { 373 printk(KERN_WARNING "One or more global auth toks could not "
393 ecryptfs_printk(KERN_ERR, "Data structure version mismatch. " 374 "properly register; rc = [%d]\n", rc);
394 "Userspace tools must match eCryptfs kernel "
395 "module with major version [%d] and minor "
396 "version [%d]\n", ECRYPTFS_VERSION_MAJOR,
397 ECRYPTFS_VERSION_MINOR);
398 rc = -EINVAL;
399 goto out;
400 }
401 if (auth_tok->token_type != ECRYPTFS_PASSWORD
402 && auth_tok->token_type != ECRYPTFS_PRIVATE_KEY) {
403 ecryptfs_printk(KERN_ERR, "Invalid auth_tok structure "
404 "returned from key query\n");
405 rc = -EINVAL;
406 goto out;
407 } 375 }
408 mount_crypt_stat->global_auth_tok_key = auth_tok_key; 376 rc = 0;
409 mount_crypt_stat->global_auth_tok = auth_tok;
410out: 377out:
411 return rc; 378 return rc;
412} 379}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-25 05:10:55 -0500