Merge commit 'fml/master' into next
[paraslash.git] / user_list.c
1 /*
2 * Copyright (C) 2006-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file user_list.c User handling for para_server. */
8
9 #include <regex.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include <openssl/rc4.h>
13
14 #include "para.h"
15 #include "error.h"
16 #include "crypt.h"
17 #include "fd.h"
18 #include "string.h"
19 #include "list.h"
20 #include "user_list.h"
21
22 static struct list_head user_list;
23
24 /*
25 * Fill the list of users known to para_server.
26 *
27 * Populates a linked list of all users in \a user_list_file. Returns on
28 * success, calls exit() on errors.
29 */
30 static void populate_user_list(char *user_list_file)
31 {
32 int ret = -E_USERLIST;
33 FILE *file_ptr = fopen(user_list_file, "r");
34
35 if (!file_ptr)
36 goto err;
37 for (;;) {
38 int num;
39 char line[255];
40 /* keyword, name, key, perms */
41 char w[255], n[255], k[255], p[255], tmp[4][255];
42 struct user *u;
43 RSA *rsa;
44
45 ret = para_fgets(line, MAXLINE, file_ptr);
46 if (ret <= 0)
47 break;
48 if (sscanf(line,"%200s %200s %200s %200s", w, n, k, p) < 3)
49 continue;
50 if (strcmp(w, "user"))
51 continue;
52 PARA_DEBUG_LOG("found entry for user %s\n", n);
53 ret = get_rsa_key(k, &rsa, LOAD_PUBLIC_KEY);
54 if (ret < 0) {
55 PARA_NOTICE_LOG("skipping entry for user %s: %s\n", n,
56 para_strerror(-ret));
57 continue;
58 }
59 if (ret < CHALLENGE_SIZE + 2 * CHALLENGE_SIZE + 41) {
60 PARA_WARNING_LOG("rsa key for %s too small\n", n);
61 rsa_free(rsa);
62 continue;
63 }
64 u = para_malloc(sizeof(*u));
65 u->name = para_strdup(n);
66 u->rsa = rsa;
67 u->perms = 0;
68 num = sscanf(p, "%200[A-Z_],%200[A-Z_],%200[A-Z_],%200[A-Z_]",
69 tmp[0], tmp[1], tmp[2], tmp[3]);
70 PARA_DEBUG_LOG("found %i perm entries\n", num);
71 while (num > 0) {
72 num--;
73 if (!strcmp(tmp[num], "VSS_READ"))
74 u->perms |= VSS_READ;
75 else if (!strcmp(tmp[num], "VSS_WRITE"))
76 u->perms |= VSS_WRITE;
77 else if (!strcmp(tmp[num], "AFS_READ"))
78 u->perms |= AFS_READ;
79 else if (!strcmp(tmp[num], "AFS_WRITE"))
80 u->perms |= AFS_WRITE;
81 else /* unknown permission */
82 PARA_WARNING_LOG("ignoring unknown permission: %s\n",
83 tmp[num]);
84 }
85 para_list_add(&u->node, &user_list);
86 }
87 fclose(file_ptr);
88 if (ret >= 0)
89 return;
90 err:
91 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
92 exit(EXIT_FAILURE);
93 }
94
95 /**
96 * Initialize the list of users allowed to connect to to para_server.
97 *
98 * \param user_list_file The file containing access information.
99 *
100 * If this function is called for the second time, the contents of the
101 * previous call are discarded, i.e. the user list is reloaded.
102 */
103 void init_user_list(char *user_list_file)
104 {
105 struct user *u, *tmp;
106 static int initialized;
107
108 if (initialized) {
109 list_for_each_entry_safe(u, tmp, &user_list, node) {
110 list_del(&u->node);
111 free(u->name);
112 rsa_free(u->rsa);
113 free(u);
114 }
115 } else
116 INIT_LIST_HEAD(&user_list);
117 initialized = 1;
118 populate_user_list(user_list_file);
119 }
120
121 /**
122 * Lookup a user in the user list.
123 *
124 * \param name The name of the user.
125 *
126 * \return A pointer to the corresponding user struct if the user was found, \p
127 * NULL otherwise.
128 */
129 struct user *lookup_user(const char *name)
130 {
131 struct user *u;
132 list_for_each_entry(u, &user_list, node) {
133 if (strcmp(u->name, name))
134 continue;
135 return u;
136 }
137 return NULL;
138 }