src/server/daemon/auth.c

Mon, 09 Sep 2013 12:15:54 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Mon, 09 Sep 2013 12:15:54 +0200
changeset 93
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parent 92
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child 115
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permissions
-rw-r--r--

fixed solaris build

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2013 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <string.h>
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32 #include <pthread.h>
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33
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34 #include <ucx/map.h>
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35
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36 #include "../util/atomic.h"
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37 #include "auth.h"
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38
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39 static pthread_mutex_t auth_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
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40 static UserCache cache;
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41
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42 void auth_cache_init() {
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43 printf("auth_cache_init\n");
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44 // TODO: config parameters
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45 //pthread_mutex_init(&auth_cache_mutex, NULL);
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46 cache.map = calloc(80, sizeof(UserCacheElm));
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47 cache.size = 80;
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48 cache.count = 0;
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49 cache.max_users = 64;
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50 cache.head = NULL;
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51 cache.trail = NULL;
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52 }
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53
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54 User* auth_cache_get(char *authdb, char *user) {
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55 //printf("auth_cache_get: %s\n", user);
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56 /*
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57 * create the key to access the map
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58 * key: authdb\0user
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59 */
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60 size_t authdblen = strlen(authdb);
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61 size_t userlen = strlen(user);
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62
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63 size_t keylen = authdblen + userlen + 1;
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64 char *key = malloc(keylen);
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65 memcpy(key, authdb, authdblen);
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66 key[authdblen] = 0;
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67 memcpy(key + authdblen + 1, user, userlen);
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68
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69 UcxKey mapkey = ucx_key(key, keylen);
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70
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71 // get cached user from map
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72 time_t now = time(NULL);
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73 size_t slot = mapkey.hash%cache.size;
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75 User *u = NULL;
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76 pthread_mutex_lock(&auth_cache_mutex);
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77
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78 UserCacheElm *elm = cache.map[slot];
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79 while(elm && elm->key.hash != mapkey.hash) {
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80 elm = elm->next_elm;
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81 }
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82 // if we have an elm, the hash is correct
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83 if(elm) {
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84 // compare the key data to be sure it is the correct user
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85 int n = (mapkey.len > elm->key.len) ? elm->key.len : mapkey.len;
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86 if (!memcmp(elm->key.data, mapkey.data, n)) {
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87 // elm is now the correct UserCacheElm
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88 // TODO: use configuration for expire time
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89 if(now - elm->created > 120) {
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90 // cached user expired
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91 // remove all users from the list from the first to this one
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92 UserCacheElm *e = cache.head;
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93 while(e) {
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94 if(e == elm) {
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95 break;
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96 }
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97 UserCacheElm *n = e->next_user;
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98 auth_cache_remove_from_map(e);
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99 e = n;
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100 }
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101 cache.head = elm->next_user;
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102 if(cache.trail == elm) {
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103 cache.trail = NULL;
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104 }
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105 auth_cache_remove_from_map(elm);
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106 u = NULL;
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107 } else {
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108 u = (User*)elm->user;
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109 }
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110 }
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111 }
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112
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113 pthread_mutex_unlock(&auth_cache_mutex);
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114 free(key);
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115 return u;
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116 }
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117
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118 void auth_cache_add(
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119 char *authdb,
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120 User *user,
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121 char *password,
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122 char **groups,
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123 size_t numgroups)
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124 {
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125 //printf("auth_cache_add: %s\n", user->name);
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126 /*
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127 * this function does not check, if the user is already in the map
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128 * use it only after auth_cache_get
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129 */
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130
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131 CachedUser *cusr = malloc(sizeof(CachedUser));
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132 cusr->user.name = strdup(user->name);
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133 cusr->user.uid = user->uid;
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134 cusr->user.gid = user->gid;
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135 cusr->user.verify_password =
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136 (user_verify_passwd_f)cached_user_verify_password;
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137 cusr->user.check_group = (user_check_group_f)cached_user_check_group;
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138 cusr->user.free = (user_free_f)cached_user_unref;
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139
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140 cusr->authdb = strdup(authdb);
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141 cusr->password = strdup(password);
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142 cusr->groups = numgroups ? calloc(numgroups, sizeof(sstr_t)) : NULL;
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143 cusr->numgroups = numgroups;
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144 for(int i=0;i<numgroups;i++) {
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145 cusr->groups[i] = sstrdup(sstr(groups[i]));
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146 }
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147 cusr->ref = 1;
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148
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149 /*
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150 * add the user to the auth cache
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151 * the auth cache is a list of all cached users
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152 */
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153
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154 // create list element
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155 time_t now = time(NULL);
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156 UserCacheElm *elm = malloc(sizeof(UserCacheElm));
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157 elm->user = cusr;
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158 elm->created = now;
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159 elm->next_elm = NULL;
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160 elm->next_user = NULL;
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161
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162 // create map key
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163 size_t authdblen = strlen(authdb);
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164 size_t userlen = strlen(user->name);
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165 size_t keylen = authdblen + userlen + 1;
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166 char *key = malloc(keylen);
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167 memcpy(key, authdb, authdblen);
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168 key[authdblen] = 0;
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169 memcpy(key + authdblen + 1, user->name, userlen);
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170 UcxKey mapkey = ucx_key(key, keylen);
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171
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172 elm->key = mapkey;
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173 elm->slot = mapkey.hash%cache.size;
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174
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175 // add user to list and map
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176 pthread_mutex_lock(&auth_cache_mutex);
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177
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178 // remove the first cached user if expired or the cache is full
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179 if(cache.head &&
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180 (cache.count >= cache.max_users || now-cache.head->created > 120))
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181 {
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182 UserCacheElm *first = cache.head;
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183 cache.head = first->next_user;
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184 if(!cache.head) {
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185 cache.trail = NULL;
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186 }
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187 auth_cache_remove_from_map(first);
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188 }
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189
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190 // add to map
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191 UserCacheElm *prevelm = cache.map[elm->slot];
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192 if(prevelm) {
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193 for(;;) {
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194 if(!prevelm->next_elm) {
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195 break;
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196 }
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197 prevelm = prevelm->next_elm;
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198 }
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199 }
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200 if(prevelm) {
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201 prevelm->next_elm = elm;
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202 } else {
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203 cache.map[elm->slot] = elm;
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204 }
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205
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206 // add to list
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207 if(cache.head) {
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208 cache.trail->next_user = elm;
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209 cache.trail = elm;
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210 } else {
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211 cache.head = elm;
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212 cache.trail = elm;
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213 }
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214
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215 cache.count++;
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216
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217 pthread_mutex_unlock(&auth_cache_mutex);
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218 }
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219
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220 void auth_cache_remove_from_map(UserCacheElm *elm) {
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221 UserCacheElm *prevelm = NULL;
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222 UserCacheElm *e = cache.map[elm->slot];
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223 while(e) {
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224 if(e == elm) {
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225 break;
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226 } else {
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227 prevelm = e;
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228 }
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229 e = e->next_elm;
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230 }
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231 if(prevelm) {
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232 prevelm->next_elm = elm->next_elm;
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233 } else {
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234 cache.map[elm->slot] = elm->next_elm;
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235 }
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236
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237 free(elm->key.data);
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238 cached_user_unref(elm->user);
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239 free(elm);
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240
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241 cache.count--;
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242 }
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243
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244 int cached_user_verify_password(CachedUser *user, char *password) {
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245 if(!strcmp(user->password, password)) {
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246 return 1;
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247 } else {
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248 return 0;
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249 }
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250 }
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251
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252 int cached_user_check_group(CachedUser *user, char *group) {
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253 sstr_t grp = sstr(group);
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254 for(int i=0;i<user->numgroups;i++) {
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255 if(!sstrcmp(user->groups[i], grp)) {
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256 return 1;
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257 }
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258 }
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259 return 0;
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260 }
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261
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262 void cached_user_unref(CachedUser *user) {
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263 uint32_t ref = ws_atomic_dec32(&user->ref);
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264 if(ref == 0) {
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265 cached_user_delete(user);
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266 }
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267 }
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268
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269 void cached_user_delete(CachedUser *user) {
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270 free(user->user.name);
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271 free(user->authdb);
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272 free(user->password);
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273 free(user->groups);
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274 free(user);
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275 }
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276
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277
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278 /*
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279 * public API
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280 * from public/auth.h
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281 */
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282
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283 User* authdb_get_user(AuthDB *db, char *user) {
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284 if(db->use_cache) {
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285 User *u = auth_cache_get(db->name, user);
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286 if(u) {
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287 return u;
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288 }
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289 }
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290 return db->get_user(db, user);
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291 }
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292
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293 User* authdb_get_and_verify(AuthDB *db, char *user, char *password, int *pw) {
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294 User *u = NULL;
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295 // try getting the user from the cache
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296 if(db->use_cache) {
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297 u = auth_cache_get(db->name, user);
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298 if(u) {
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299 if(u->verify_password(u, password)) {
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300 *pw = 1;
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301 } else {
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302 *pw = 0;
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diff changeset
303 u->free(u);
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304 u = NULL;
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305 }
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306 return u;
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307 }
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308 }
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diff changeset
309 // user not cached
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310 u = db->get_user(db, user);
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311 if(u) {
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diff changeset
312 if(u->verify_password(u, password)) {
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diff changeset
313 if(db->use_cache) {
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314 auth_cache_add(db->name, u, password, NULL, 0);
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diff changeset
315 }
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diff changeset
316 *pw = 1;
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317 } else {
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diff changeset
318 *pw = 0;
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diff changeset
319 u->free(u);
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parents: 59
diff changeset
320 u = NULL;
74babc0082b7 added authentication cache
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 59
diff changeset
321 }
74babc0082b7 added authentication cache
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 59
diff changeset
322 }
74babc0082b7 added authentication cache
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 59
diff changeset
323 return u;
74babc0082b7 added authentication cache
Olaf Wintermann <olaf.wintermann@gmail.com>
parents: 59
diff changeset
324 }

mercurial