2 * Copyright (C) 2006-2011 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file user_list.c User handling for para_server. */
10 #include <sys/types.h>
19 #include "user_list.h"
21 static struct list_head user_list;
24 * Fill the list of users known to para_server.
26 * Populates a linked list of all users in \a user_list_file. Returns on
27 * success, calls exit() on errors.
29 static void populate_user_list(char *user_list_file)
31 int ret = -E_USERLIST;
32 FILE *file_ptr = fopen(user_list_file, "r");
39 /* keyword, name, key, perms */
40 char w[255], n[255], k[255], p[255], tmp[4][255];
42 struct asymmetric_key *pubkey;
44 ret = para_fgets(line, sizeof(line), file_ptr);
47 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
49 if (strcmp(w, "user"))
51 PARA_DEBUG_LOG("found entry for user %s\n", n);
52 ret = get_asymmetric_key(k, LOAD_PUBLIC_KEY, &pubkey);
54 PARA_NOTICE_LOG("skipping entry for user %s: %s\n", n,
59 * In order to encrypt len := CHALLENGE_SIZE + 2 * SESSION_KEY_LEN
60 * bytes using RSA_public_encrypt() with EME-OAEP padding mode,
61 * RSA_size(rsa) must be greater than len + 41. So ignore keys
62 * which are too short. For details see RSA_public_encrypt(3).
64 if (ret <= CHALLENGE_SIZE + 2 * SESSION_KEY_LEN + 41) {
65 PARA_WARNING_LOG("public key %s too short (%d)\n",
67 free_asymmetric_key(pubkey);
70 u = para_malloc(sizeof(*u));
71 u->name = para_strdup(n);
74 num = sscanf(p, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
75 tmp[0], tmp[1], tmp[2], tmp[3]);
76 PARA_DEBUG_LOG("found %i perm entries\n", num);
79 if (!strcmp(tmp[num], "VSS_READ"))
81 else if (!strcmp(tmp[num], "VSS_WRITE"))
82 u->perms |= VSS_WRITE;
83 else if (!strcmp(tmp[num], "AFS_READ"))
85 else if (!strcmp(tmp[num], "AFS_WRITE"))
86 u->perms |= AFS_WRITE;
87 else /* unknown permission */
88 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
91 para_list_add(&u->node, &user_list);
97 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
102 * Initialize the list of users allowed to connect to to para_server.
104 * \param user_list_file The file containing access information.
106 * If this function is called for the second time, the contents of the
107 * previous call are discarded, i.e. the user list is reloaded.
109 void init_user_list(char *user_list_file)
111 struct user *u, *tmp;
112 static int initialized;
115 list_for_each_entry_safe(u, tmp, &user_list, node) {
118 free_asymmetric_key(u->pubkey);
122 INIT_LIST_HEAD(&user_list);
124 populate_user_list(user_list_file);
128 * Lookup a user in the user list.
130 * \param name The name of the user.
132 * \return A pointer to the corresponding user struct if the user was found, \p
135 struct user *lookup_user(const char *name)
138 list_for_each_entry(u, &user_list, node) {
139 if (strcmp(u->name, name))