src/server/daemon/auth.c

Wed, 31 May 2023 13:08:49 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Wed, 31 May 2023 13:08:49 +0200
changeset 496
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parent 490
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permissions
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add http range debug logging

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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 <cx/map.h>
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35
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36 #include "../public/nsapi.h"
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37 #include "../util/atomic.h"
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38 #include "auth.h"
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39
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40 static pthread_mutex_t auth_cache_mutex = PTHREAD_MUTEX_INITIALIZER;
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41 static UserCache cache;
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42
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43 void auth_cache_init() {
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44 log_ereport(LOG_VERBOSE, "auth_cache_init");
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45 // TODO: config parameters
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46 //pthread_mutex_init(&auth_cache_mutex, NULL);
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47 cache.map = calloc(80, sizeof(UserCacheElm));
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48 cache.size = 80;
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49 cache.count = 0;
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50 cache.max_users = 64;
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51 cache.head = NULL;
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52 cache.trail = NULL;
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53 }
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54
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55 User* auth_cache_get(char *authdb, const char *user) {
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56 //printf("auth_cache_get: %s\n", user);
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57 /*
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58 * create the key to access the map
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59 * key: authdb\0user
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60 */
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61 size_t authdblen = strlen(authdb);
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62 size_t userlen = strlen(user);
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64 size_t keylen = authdblen + userlen + 1;
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65 unsigned char *key = malloc(keylen);
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66 memcpy(key, authdb, authdblen);
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67 key[authdblen] = 0;
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68 memcpy(key + authdblen + 1, user, userlen);
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69
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70 CxHashKey mapkey = cx_hash_key_bytes(key, keylen);
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71
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72 // get cached user from map
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73 time_t now = time(NULL);
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74 size_t slot = mapkey.hash%cache.size;
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75
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76 User *u = NULL;
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77 pthread_mutex_lock(&auth_cache_mutex);
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79 UserCacheElm *elm = cache.map[slot];
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80 while(elm && elm->key.hash != mapkey.hash) {
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81 elm = elm->next_elm;
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82 }
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83 // if we have an elm, the hash is correct
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84 if(elm) {
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85 // compare the key data to be sure it is the correct user
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86 int n = (mapkey.len > elm->key.len) ? elm->key.len : mapkey.len;
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87 if (!memcmp(elm->key.data, mapkey.data, n)) {
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88 // elm is now the correct UserCacheElm
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89 // TODO: use configuration for expire time
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90 if(now - elm->created > 120) {
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91 // cached user expired
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92 // remove all users from the list from the first to this one
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93 UserCacheElm *e = cache.head;
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94 while(e) {
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95 if(e == elm) {
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96 break;
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97 }
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98 UserCacheElm *nu = e->next_user;
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99 auth_cache_remove_from_map(e);
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100 e = nu;
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101 }
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102 cache.head = elm->next_user;
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103 if(cache.trail == elm) {
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104 cache.trail = NULL;
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105 }
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106 auth_cache_remove_from_map(elm);
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107 u = NULL;
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108 } else {
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109 u = (User*)elm->user;
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110 }
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111 }
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112 }
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113
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114 pthread_mutex_unlock(&auth_cache_mutex);
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115 free(key);
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116 return u;
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117 }
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118
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119 void auth_cache_add(
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120 char *authdb,
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121 User *user,
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122 const char *password,
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123 const char **groups,
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124 size_t numgroups)
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125 {
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126 //printf("auth_cache_add: %s\n", user->name);
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127 /*
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128 * this function does not check, if the user is already in the map
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129 * use it only after auth_cache_get
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130 */
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131
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132 CachedUser *cusr = malloc(sizeof(CachedUser));
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133 cusr->user.name = strdup(user->name);
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134 cusr->user.uid = user->uid;
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135 cusr->user.gid = user->gid;
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136 cusr->user.verify_password =
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137 (user_verify_passwd_f)cached_user_verify_password;
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138 cusr->user.check_group = (user_check_group_f)cached_user_check_group;
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139 cusr->user.free = (user_free_f)cached_user_unref;
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140
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141 cusr->authdb = strdup(authdb);
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142 cusr->password = strdup(password);
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143 cusr->groups = numgroups ? calloc(numgroups, sizeof(cxmutstr)) : NULL;
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144 cusr->numgroups = numgroups;
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145 for(int i=0;i<numgroups;i++) {
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146 cusr->groups[i] = cx_strdup(cx_str(groups[i]));
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147 }
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148 cusr->ref = 1;
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149
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150 /*
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151 * add the user to the auth cache
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152 * the auth cache is a list of all cached users
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153 */
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154
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155 // create list element
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156 time_t now = time(NULL);
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157 UserCacheElm *elm = malloc(sizeof(UserCacheElm));
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158 elm->user = cusr;
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159 elm->created = now;
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160 elm->next_elm = NULL;
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161 elm->next_user = NULL;
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162
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163 // create map key
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164 size_t authdblen = strlen(authdb);
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165 size_t userlen = strlen(user->name);
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166 size_t keylen = authdblen + userlen + 1;
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167 unsigned char *key = malloc(keylen);
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168 memcpy(key, authdb, authdblen);
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169 key[authdblen] = 0;
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170 memcpy(key + authdblen + 1, user->name, userlen);
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171 CxHashKey mapkey = cx_hash_key_bytes(key, keylen);
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172
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173 elm->key.data = key;
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174 elm->key.len = mapkey.len;
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175 elm->key.hash = mapkey.hash;
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176 elm->slot = mapkey.hash%cache.size;
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177
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178 // add user to list and map
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179 pthread_mutex_lock(&auth_cache_mutex);
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180
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181 // remove the first cached user if expired or the cache is full
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182 if(cache.head &&
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183 (cache.count >= cache.max_users || now-cache.head->created > 120))
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184 {
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185 UserCacheElm *first = cache.head;
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186 cache.head = first->next_user;
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187 if(!cache.head) {
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188 cache.trail = NULL;
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189 }
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190 auth_cache_remove_from_map(first);
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191 }
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192
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193 // add to map
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194 UserCacheElm *prevelm = cache.map[elm->slot];
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195 if(prevelm) {
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196 for(;;) {
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197 if(!prevelm->next_elm) {
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198 break;
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199 }
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200 prevelm = prevelm->next_elm;
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201 }
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202 }
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203 if(prevelm) {
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204 prevelm->next_elm = elm;
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205 } else {
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206 cache.map[elm->slot] = elm;
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207 }
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208
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209 // add to list
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210 if(cache.head) {
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211 cache.trail->next_user = elm;
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212 cache.trail = elm;
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213 } else {
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214 cache.head = elm;
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215 cache.trail = elm;
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216 }
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217
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218 cache.count++;
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219
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220 pthread_mutex_unlock(&auth_cache_mutex);
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221 }
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222
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223 void auth_cache_remove_from_map(UserCacheElm *elm) {
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224 UserCacheElm *prevelm = NULL;
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225 UserCacheElm *e = cache.map[elm->slot];
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226 while(e) {
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227 if(e == elm) {
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228 break;
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229 } else {
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230 prevelm = e;
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231 }
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232 e = e->next_elm;
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233 }
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234 if(prevelm) {
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235 prevelm->next_elm = elm->next_elm;
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236 } else {
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237 cache.map[elm->slot] = elm->next_elm;
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238 }
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239
490
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240 free((void*)elm->key.data);
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241 cached_user_unref(elm->user);
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242 free(elm);
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243
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244 cache.count--;
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245 }
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246
415
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247 int cached_user_verify_password(CachedUser *user, const char *password) {
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248 if(!strcmp(user->password, password)) {
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249 return 1;
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250 } else {
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251 return 0;
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252 }
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253 }
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254
415
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255 int cached_user_check_group(CachedUser *user, const char *group) {
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256 cxstring grp = cx_str(group);
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257 for(int i=0;i<user->numgroups;i++) {
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258 if(!cx_strcmp(cx_strcast(user->groups[i]), grp)) {
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259 return 1;
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260 }
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261 }
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262 return 0;
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263 }
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264
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265 void cached_user_unref(CachedUser *user) {
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266 uint32_t ref = ws_atomic_dec32(&user->ref);
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267 if(ref == 0) {
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268 cached_user_delete(user);
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269 }
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270 }
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271
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272 void cached_user_delete(CachedUser *user) {
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273 free(user->user.name);
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274 free(user->authdb);
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275 free(user->password);
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276 free(user->groups);
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277 free(user);
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278 }
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279
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280
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281 /*
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282 * public API
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283 * from public/auth.h
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284 */
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285
467
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286 User* authdb_get_user(AuthDB *db, Session *sn, Request *rq, const char *user) {
66
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287 if(db->use_cache) {
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288 User *u = auth_cache_get(db->name, user);
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289 if(u) {
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290 return u;
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291 }
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292 }
467
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293 return db->get_user(db, sn, rq, user);
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294 }
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295
467
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296 User* authdb_get_and_verify(AuthDB *db, Session *sn, Request *rq, const char *user, const char *password, int *pw) {
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297 User *u = authdb_get_user(db, sn, rq, user);
66
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298 if(u) {
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299 if(u->verify_password(u, password)) {
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300 if(db->use_cache) {
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301 auth_cache_add(db->name, u, password, NULL, 0);
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302 }
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303 *pw = 1;
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304 } else {
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305 *pw = 0;
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diff changeset
306 u->free(u);
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307 u = NULL;
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308 }
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309 }
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310 return u;
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diff changeset
311 }

mercurial