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Diffstat (limited to 'fs/ecryptfs/keystore.c')
-rw-r--r--fs/ecryptfs/keystore.c743
1 files changed, 465 insertions, 278 deletions
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
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-16 18:31:17 -0500