src/server/daemon/keyfile_auth.c

Tue, 12 Sep 2023 18:08:11 +0200

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Tue, 12 Sep 2023 18:08:11 +0200
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permissions
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update uwproj

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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
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33 #include <openssl/sha.h>
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34 #if defined(__sun) && defined(__SunOS_5_10)
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35 #include <sha2.h>
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36 #define SHA256_Init SHA256Init
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37 #define SHA256_Update SHA256Update
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38 #define SHA256_Final SHA256Final
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39 #endif
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40
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41 #include "../util/atomic.h"
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42 #include "../util/util.h"
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43
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44 #include <cx/hash_map.h>
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45
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46 #include "keyfile_auth.h"
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47
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48 Keyfile* keyfile_new(CxAllocator *a) {
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49 Keyfile *keyfile = cxCalloc(a, 1, sizeof(Keyfile));
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50 if(!keyfile) {
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51 return NULL;
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52 }
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53 keyfile->authdb.get_user = keyfile_get_user;
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54 keyfile->authdb.use_cache = 0;
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55 keyfile->users = cxHashMapCreate(a, CX_STORE_POINTERS, 16);
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56 return keyfile;
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57 }
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58
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59 int keyfile_add_user(
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60 Keyfile *keyfile,
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61 cxmutstr name,
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62 enum KeyfileHashType hash_type,
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63 cxmutstr hash,
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64 cxmutstr *groups,
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65 size_t ngroups)
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66 {
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67 const CxAllocator *a = keyfile->users->allocator;
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68
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69 if(hash.length < 12) {
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70 // hash too short
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71 // TODO: log
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72 return -1;
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73 }
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74
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75 KeyfileUser *user = cxMalloc(a, sizeof(KeyfileUser));
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76 user->user.name = cx_strdup_a(a, cx_strcast(name)).ptr;
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77 user->user.uid = -1;
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78 user->user.gid = -1;
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79 user->user.verify_password = keyfile_user_verify_password;
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80 user->user.check_group = keyfile_user_check_group;
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81 user->user.free = keyfile_user_free;
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82
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83 user->hash_type = hash_type;
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84 user->hash = cxMalloc(a, hash.length + 1);
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85
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86 if(!user->user.name || !user->hash) {
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87 return -1;
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88 }
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89
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90 user->hashlen = util_base64decode(hash.ptr, hash.length, user->hash);
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91
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92 if(ngroups > 0) {
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93 user->groups = cxCalloc(a, ngroups, sizeof(cxmutstr));
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94 if(!user->groups) {
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95 return -1;
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96 }
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97 for(int i=0;i<ngroups;i++) {
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98 user->groups[i] = cx_strdup_a(a, cx_strcast(groups[i]));
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99 }
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100
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101 } else {
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102 user->groups = NULL;
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103 }
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104
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105 // add to keyfile
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106 return cxMapPut(keyfile->users, cx_hash_key(name.ptr, name.length), user);
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107 }
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108
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109 // authdb functions
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110
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111 User* keyfile_get_user(AuthDB *db, Session *sn, Request *rq, const char *user) {
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112 Keyfile *keyfile = (Keyfile*)db;
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113 return cxMapGet(keyfile->users, cx_hash_key_str(user));
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114 }
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115
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116 int keyfile_user_verify_password(User *user, const char *password) {
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117 KeyfileUser *usr = (KeyfileUser*)user;
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118 return ssha_verify(usr, password);
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119 }
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120
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121 int keyfile_user_check_group(User *user, const char *group) {
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122 KeyfileUser *usr = (KeyfileUser*)user;
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123 cxstring grp = cx_str(group);
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124 for(int i=0;i<usr->numgroups;i++) {
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125 if(!cx_strcmp(cx_strcast(usr->groups[i]), grp)) {
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126 return 1;
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127 }
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128 }
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129 return 0;
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130 }
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131
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132 void keyfile_user_free(User *user) {
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133 // don't free, it will be freed by keyfile_unref
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134 }
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135
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136
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137 int ssha_verify(KeyfileUser *user, const char *password) {
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138 /*
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139 * SSHA: SHA(pw + salt) + salt
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140 * user->hash is already base64 decoded
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141 */
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142
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143 size_t hlen;
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144 switch(user->hash_type) {
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145 case KEYFILE_SSHA: hlen = 20; break;
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146 case KEYFILE_SSHA256: hlen = 32; break;
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147 case KEYFILE_SSHA512: hlen = 64; break;
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148 }
97
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149
174
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150 char *salt = user->hash + hlen;
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151 size_t saltlen = user->hashlen - hlen;
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152
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153 size_t pwlen = strlen(password);
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154
174
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155 unsigned char pwhash[64];
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156 switch(user->hash_type) {
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157 case KEYFILE_SSHA: {
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158 SHA_CTX ctx;
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159 SHA1_Init(&ctx);
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160 SHA1_Update(&ctx, password, pwlen);
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161 SHA1_Update(&ctx, salt, saltlen);
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162 SHA1_Final(pwhash, &ctx);
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163 break;
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164 }
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165 case KEYFILE_SSHA256: {
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166 SHA256_CTX ctx;
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167 SHA256_Init(&ctx);
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168 SHA256_Update(&ctx, password, pwlen);
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169 SHA256_Update(&ctx, salt, saltlen);
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170 SHA256_Final(pwhash, &ctx);
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171 break;
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172 }
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173 case KEYFILE_SSHA512: {
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174 SHA512_CTX ctx;
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175 SHA512_Init(&ctx);
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176 SHA512_Update(&ctx, password, pwlen);
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177 SHA512_Update(&ctx, salt, saltlen);
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178 SHA512_Final(pwhash, &ctx);
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179 break;
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180 }
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181 }
62
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182
174
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183 if(!memcmp(user->hash, pwhash, hlen)) {
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184 return 1;
64
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185 } else {
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186 return 0;
62
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187 }
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188 }
174
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189

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