1 /* |
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2 * Copyright (c) 2010, 2011, Oracle and/or its affiliates. All rights reserved. |
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3 */ |
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4 |
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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 |
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8 * are met: |
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9 * |
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10 * 1. Redistributions of source code must retain the above copyright |
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11 * notice, this list of conditions and the following disclaimer. |
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12 * |
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13 * 2. Redistributions in binary form must reproduce the above copyright |
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14 * notice, this list of conditions and the following disclaimer in |
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15 * the documentation and/or other materials provided with the |
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16 * distribution. |
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17 * |
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18 * 3. All advertising materials mentioning features or use of this |
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19 * software must display the following acknowledgment: |
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20 * "This product includes software developed by the OpenSSL Project |
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21 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
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22 * |
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23 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
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24 * endorse or promote products derived from this software without |
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25 * prior written permission. For written permission, please contact |
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26 * [email protected]. |
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27 * |
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28 * 5. Products derived from this software may not be called "OpenSSL" |
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29 * nor may "OpenSSL" appear in their names without prior written |
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30 * permission of the OpenSSL Project. |
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31 * |
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32 * 6. Redistributions of any form whatsoever must retain the following |
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33 * acknowledgment: |
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34 * "This product includes software developed by the OpenSSL Project |
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35 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
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36 * |
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37 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
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38 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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39 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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40 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
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41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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43 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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44 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
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46 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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47 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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48 * OF THE POSSIBILITY OF SUCH DAMAGE. |
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49 */ |
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50 |
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51 #include <stdio.h> |
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52 #include <stdlib.h> |
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53 #include <string.h> |
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54 #include <sys/types.h> |
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55 #include <sys/wait.h> |
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56 #include <sys/mman.h> |
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57 #include <unistd.h> |
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58 #include <strings.h> |
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59 #include <libgen.h> |
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60 #include <pthread.h> |
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61 #include <assert.h> |
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62 #include <errno.h> |
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63 |
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64 #include <openssl/crypto.h> |
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65 |
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66 #ifndef OPENSSL_NO_HW |
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67 #ifndef OPENSSL_NO_HW_PK11 |
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68 |
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69 #include <security/cryptoki.h> |
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70 #include <security/pkcs11.h> |
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71 #include "hw_pk11.h" |
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72 #include "hw_pk11_uri.h" |
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73 |
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74 /* |
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75 * The keystore used is always from the pubkey slot so we need to know which one |
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76 * was selected so that we can get the information needed for the URI |
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77 * processing. |
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78 */ |
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79 extern CK_SLOT_ID pubkey_SLOTID; |
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80 extern CK_FUNCTION_LIST_PTR pFuncList; |
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81 |
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82 /* |
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83 * Cached PIN so that child can use it during the re-login. Note that we do not |
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84 * cache the PIN by default. |
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85 */ |
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86 static char *token_pin; |
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87 |
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88 static int mlock_pin_in_memory(char *pin); |
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89 static char *run_askpass(char *dialog); |
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90 |
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91 /* |
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92 * Get the PIN. Either run the command and use its standard output as a PIN to |
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93 * fill in the PKCS11 URI structure, or read the PIN from the terminal. Using |
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94 * the external command is of higher precedence. The memory for PIN is allocated |
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95 * in this function and the PIN is always NULL terminated. The caller must take |
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96 * care of freeing the memory used for the PIN. The maximum PIN length accepted |
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97 * is PK11_MAX_PIN_LEN. |
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98 * |
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99 * The function is used also during the re-initialization of the engine after |
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100 * the fork. |
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101 * |
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102 * The function must not be called under the protection of the mutex "uri_lock" |
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103 * because the lock is acquired in the prefork function. |
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104 * |
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105 * Returns: |
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106 * 0 in case of troubles (and sets "*pin" to NULL) |
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107 * 1 if we got the PIN |
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108 */ |
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109 #define EXEC_SPEC "exec:" |
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110 #define BUILTIN_SPEC "builtin" |
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111 int |
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112 pk11_get_pin(char *dialog, char **pin) |
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113 { |
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114 /* Initialize as an error. */ |
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115 *pin = NULL; |
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116 |
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117 if (strcmp(dialog, BUILTIN_SPEC) == 0) |
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118 { |
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119 /* The getpassphrase() function is not MT safe. */ |
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120 (void) pthread_mutex_lock(uri_lock); |
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121 /* Note that OpenSSL is not localized at all. */ |
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122 *pin = getpassphrase("Enter token PIN: "); |
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123 if (*pin == NULL) |
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124 { |
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125 PK11err(PK11_F_GET_PIN, PK11_R_COULD_NOT_READ_PIN); |
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126 (void) pthread_mutex_unlock(uri_lock); |
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127 goto err; |
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128 } |
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129 else |
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130 { |
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131 char *pw; |
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132 |
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133 /* |
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134 * getpassphrase() uses an internal buffer to hold the |
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135 * entered password. Note that it terminates the buffer |
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136 * with '\0'. |
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137 */ |
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138 if ((pw = strdup(*pin)) == NULL) |
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139 { |
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140 PK11err(PK11_F_GET_PIN, PK11_R_MALLOC_FAILURE); |
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141 (void) pthread_mutex_unlock(uri_lock); |
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142 goto err; |
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143 } |
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144 /* Zero the internal buffer to get rid of the PIN. */ |
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145 memset(*pin, 0, strlen(*pin)); |
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146 *pin = pw; |
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147 (void) pthread_mutex_unlock(uri_lock); |
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148 } |
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149 } |
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150 else |
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151 { |
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152 /* |
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153 * This is the "exec:" case. We will get the PIN from the output |
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154 * of an external command. |
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155 */ |
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156 if (strncmp(dialog, EXEC_SPEC, strlen(EXEC_SPEC)) == 0) |
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157 { |
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158 dialog += strlen(EXEC_SPEC); |
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159 if ((*pin = run_askpass(dialog)) == NULL) |
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160 goto err; |
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161 } |
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162 else |
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163 { |
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164 /* |
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165 * Invalid specification in the passphrasedialog |
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166 * keyword. |
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167 */ |
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168 PK11err(PK11_F_GET_PIN, PK11_R_BAD_PASSPHRASE_SPEC); |
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169 goto err; |
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170 } |
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171 } |
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172 |
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173 return (1); |
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174 err: |
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175 return (0); |
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176 } |
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177 |
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178 /* |
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179 * Process the PKCS#11 URI and get the PIN. It uses information from the |
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180 * passphrasedialog keyword to get the PIN. If passphrasedialog is not present |
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181 * it is not considered an error since it depends on the token attributes |
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182 * whether C_Login() is required. The function expects an allocated 'uri_struct' |
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183 * structure. |
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184 * |
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185 * Returns: |
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186 * 0 if URI is not valid at all, or if we could not get the PIN |
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187 * 1 if all is OK |
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188 * 2 if the URI is not the PKCS#11 URI. In that case, put the string |
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189 * pointer to the filename to "*file". Note that the pointer just points |
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190 * inside of the "uristr", possibly skipping the file:// prefix if present. |
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191 */ |
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192 int |
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193 pk11_process_pkcs11_uri(const char *uristr, pkcs11_uri *uri_struct, |
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194 const char **file) |
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195 { |
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196 char *uristr2, *l1, *l2, *tok, *name; |
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197 |
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198 /* Check the "file://" case. */ |
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199 if (strncmp(uristr, FILE_URI_PREFIX, strlen(FILE_URI_PREFIX)) == 0) |
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200 { |
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201 *file = uristr + strlen(FILE_URI_PREFIX); |
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202 return (2); |
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203 } |
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204 |
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205 /* This is the "pkcs11:" case. */ |
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206 if (strncmp(uristr, PK11_URI_PREFIX, strlen(PK11_URI_PREFIX)) != 0) |
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207 { |
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208 /* Not PKCS#11 URI at all, could be a filename. */ |
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209 *file = (const char *)uristr; |
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210 return (2); |
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211 } |
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212 else |
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213 { |
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214 /* Dup the string and skip over the pkcs11: prefix then. */ |
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215 uristr2 = strdup(uristr + strlen(PK11_URI_PREFIX)); |
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216 if (uristr2 == NULL) |
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217 { |
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218 PK11err(PK11_F_CHECK_TOKEN_ATTRS, |
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219 PK11_R_MALLOC_FAILURE); |
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220 goto err; |
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221 } |
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222 } |
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223 |
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224 /* Initialize the structure. */ |
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225 memset(uri_struct, 0, sizeof (*uri_struct)); |
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226 |
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227 /* |
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228 * Using strtok_r() would silently skip over multiple semicolons. We |
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229 * must check that before moving on. We must also avoid ';' as the first |
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230 * and the last character in the URI. |
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231 */ |
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232 if (strstr(uristr2, ";;") != NULL || uristr2[0] == ';' || |
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233 (strlen(uristr2) > 0 && uristr2[strlen(uristr2) - 1] == ';')) |
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234 goto bad_uri; |
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235 |
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236 tok = strtok_r(uristr2, ";", &l1); |
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237 for (; tok != NULL; tok = strtok_r(NULL, ";", &l1)) |
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238 { |
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239 /* "tok" is not empty so there will be something in "name". */ |
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240 name = strtok_r(tok, "=", &l2); |
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241 /* Check whether there is '=' at all. */ |
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242 if (l2 == NULL) |
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243 goto bad_uri; |
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244 |
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245 /* |
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246 * Fill out the URI structure. We do not accept duplicit |
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247 * attributes. |
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248 */ |
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249 if (strcmp(name, PK11_TOKEN) == 0) |
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250 if (uri_struct->token == NULL) |
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251 { |
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252 if ((uri_struct->token = strdup(l2)) == NULL) |
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253 goto no_mem; |
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254 } |
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255 else |
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256 goto bad_uri; |
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257 else if (strcmp(name, PK11_MANUF) == 0) |
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258 if (uri_struct->manuf == NULL) |
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259 { |
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260 if ((uri_struct->manuf = strdup(l2)) == NULL) |
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261 goto no_mem; |
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262 } |
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263 else |
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264 goto bad_uri; |
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265 else if (strcmp(name, PK11_SERIAL) == 0) |
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266 if (uri_struct->serial == NULL) |
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267 { |
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268 if ((uri_struct->serial = strdup(l2)) == NULL) |
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269 goto no_mem; |
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270 } |
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271 else |
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272 goto bad_uri; |
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273 else if (strcmp(name, PK11_MODEL) == 0) |
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274 if (uri_struct->model == NULL) |
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275 { |
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276 if ((uri_struct->model = strdup(l2)) == NULL) |
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277 goto no_mem; |
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278 } |
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279 else |
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280 goto bad_uri; |
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281 else if (strcmp(name, PK11_OBJECT) == 0) |
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282 if (uri_struct->object == NULL) |
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283 { |
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284 if ((uri_struct->object = strdup(l2)) == NULL) |
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285 goto no_mem; |
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286 } |
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287 else |
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288 goto bad_uri; |
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289 else if (strcmp(name, PK11_OBJECTTYPE) == 0) |
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290 if (uri_struct->objecttype == NULL) |
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291 { |
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292 uri_struct->objecttype = strdup(l2); |
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293 if (uri_struct->objecttype == NULL) |
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294 goto no_mem; |
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295 } |
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296 else |
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297 goto bad_uri; |
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298 else if (strcmp(name, PK11_ASKPASS) == 0) |
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299 if (uri_struct->askpass == NULL) |
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300 { |
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301 if ((uri_struct->askpass = strdup(l2)) == NULL) |
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302 goto no_mem; |
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303 } |
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304 else |
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305 goto bad_uri; |
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306 else |
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307 goto bad_uri; |
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308 } |
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309 |
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310 /* The "object" token is mandatory in the PKCS#11 URI. */ |
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311 if (uri_struct->object == NULL) |
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312 { |
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313 PK11err(PK11_F_LOAD_PRIVKEY, PK11_R_MISSING_OBJECT_LABEL); |
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314 goto err; |
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315 } |
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316 |
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317 free(uristr2); |
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318 return (1); |
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319 bad_uri: |
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320 PK11err(PK11_F_LOAD_PRIVKEY, PK11_R_INVALID_PKCS11_URI); |
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321 if (uristr2 != NULL) |
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322 free(uristr2); |
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323 return (0); |
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324 no_mem: |
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325 PK11err(PK11_F_LOAD_PRIVKEY, PK11_R_MALLOC_FAILURE); |
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326 err: |
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327 pk11_free_pkcs11_uri(uri_struct, CK_FALSE); |
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328 if (uristr2 != NULL) |
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329 free(uristr2); |
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330 return (0); |
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331 } |
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332 |
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333 /* |
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334 * Free the PKCS11 URI structure and anything that might be inside. |
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335 */ |
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336 void |
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337 pk11_free_pkcs11_uri(pkcs11_uri *uri_struct, CK_BBOOL free_uri_itself) |
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338 { |
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339 if (uri_struct->token != NULL) |
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340 free(uri_struct->token); |
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341 if (uri_struct->manuf != NULL) |
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342 free(uri_struct->manuf); |
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343 if (uri_struct->serial != NULL) |
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344 free(uri_struct->serial); |
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345 if (uri_struct->model != NULL) |
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346 free(uri_struct->model); |
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347 if (uri_struct->object != NULL) |
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348 free(uri_struct->object); |
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349 if (uri_struct->objecttype != NULL) |
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350 free(uri_struct->objecttype); |
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351 if (uri_struct->askpass != NULL) |
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352 free(uri_struct->askpass); |
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353 |
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354 if (free_uri_itself == CK_TRUE) |
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355 OPENSSL_free(uri_struct); |
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356 } |
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357 |
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358 /* |
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359 * While our keystore is always the one used by the pubkey slot (which is |
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360 * usually the Metaslot) we must make sure that those URI attributes that |
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361 * specify the keystore match the real attributes of our slot keystore. Note |
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362 * that one can use the METASLOT_OBJECTSTORE_TOKEN environment variable to |
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363 * change the Metaslot's keystore from the softtoken to something else (see |
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364 * libpkcs11(3LIB)). The user might want to use such attributes in the PKCS#11 |
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365 * URI to make sure that the intended keystore is used. |
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366 * |
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367 * Returns: |
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368 * 1 on success |
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369 * 0 on failure |
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370 */ |
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371 int |
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372 pk11_check_token_attrs(pkcs11_uri *uri_struct) |
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373 { |
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374 CK_RV rv; |
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375 static CK_TOKEN_INFO_PTR token_info = NULL; |
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376 |
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377 (void) pthread_mutex_lock(uri_lock); |
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378 if (token_info == NULL) |
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379 { |
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380 token_info = OPENSSL_malloc(sizeof (CK_TOKEN_INFO)); |
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381 if (token_info == NULL) |
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382 { |
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383 PK11err(PK11_F_CHECK_TOKEN_ATTRS, |
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384 PK11_R_MALLOC_FAILURE); |
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385 goto err; |
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386 } |
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387 |
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388 rv = pFuncList->C_GetTokenInfo(pubkey_SLOTID, token_info); |
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389 if (rv != CKR_OK) |
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390 { |
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391 PK11err_add_data(PK11_F_CHECK_TOKEN_ATTRS, |
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392 PK11_R_GETTOKENINFO, rv); |
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393 goto err; |
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394 } |
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395 } |
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396 |
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397 if (uri_struct->token != NULL) |
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398 if (strncmp(uri_struct->token, (char *)token_info->label, |
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399 strlen(uri_struct->token) > 32 ? 32 : |
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400 strlen(uri_struct->token)) != 0) |
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401 { |
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402 goto urierr; |
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403 } |
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404 |
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405 if (uri_struct->manuf != NULL) |
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406 if (strncmp(uri_struct->manuf, |
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407 (char *)token_info->manufacturerID, |
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408 strlen(uri_struct->manuf) > 32 ? 32 : |
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409 strlen(uri_struct->manuf)) != 0) |
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410 goto urierr; |
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411 |
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412 if (uri_struct->model != NULL) |
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413 if (strncmp(uri_struct->model, (char *)token_info->model, |
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414 strlen(uri_struct->model) > 16 ? 16 : |
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415 strlen(uri_struct->model)) != 0) |
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416 goto urierr; |
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417 |
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418 if (uri_struct->serial != NULL) |
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419 if (strncmp(uri_struct->serial, |
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420 (char *)token_info->serialNumber, |
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421 strlen(uri_struct->serial) > 16 ? 16 : |
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422 strlen(uri_struct->serial)) != 0) |
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423 goto urierr; |
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424 |
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425 (void) pthread_mutex_unlock(uri_lock); |
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426 return (1); |
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427 |
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428 urierr: |
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429 PK11err(PK11_F_CHECK_TOKEN_ATTRS, PK11_R_TOKEN_ATTRS_DO_NOT_MATCH); |
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430 /* Correct error already set above for the "err" label. */ |
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431 err: |
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432 (void) pthread_mutex_unlock(uri_lock); |
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433 return (0); |
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434 } |
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435 |
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436 /* |
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437 * Return the process PIN caching policy. We initialize it just once so if the |
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438 * process change OPENSSL_PKCS11_PIN_CACHING_POLICY during the operation it will |
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439 * not have any affect on the policy. |
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440 * |
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441 * We assume that the "uri_lock" mutex is already locked. |
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442 * |
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443 * Returns the caching policy number. |
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444 */ |
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445 int |
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446 pk11_get_pin_caching_policy(void) |
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447 { |
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448 char *value = NULL; |
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449 static int policy = POLICY_NOT_INITIALIZED; |
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450 |
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451 if (policy != POLICY_NOT_INITIALIZED) |
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452 return (policy); |
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453 |
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454 value = getenv("OPENSSL_PKCS11_PIN_CACHING_POLICY"); |
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455 |
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456 if (value == NULL || strcmp(value, "none") == 0) |
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457 { |
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458 policy = POLICY_NONE; |
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459 goto done; |
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460 } |
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461 |
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462 if (strcmp(value, "memory") == 0) |
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463 { |
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464 policy = POLICY_MEMORY; |
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465 goto done; |
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466 } |
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467 |
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468 if (strcmp(value, "mlocked-memory") == 0) |
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469 { |
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470 policy = POLICY_MLOCKED_MEMORY; |
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471 goto done; |
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472 } |
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473 |
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474 return (POLICY_WRONG_VALUE); |
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475 done: |
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476 return (policy); |
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477 } |
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478 |
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479 /* |
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480 * Cache the PIN in memory once. We already know that we have either "memory" or |
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481 * "mlocked-memory" keyword correctly set. |
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482 * |
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483 * Returns: |
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484 * 1 on success |
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485 * 0 on failure |
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486 */ |
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487 int |
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488 pk11_cache_pin(char *pin) |
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489 { |
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490 (void) pthread_mutex_lock(uri_lock); |
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491 /* We set the PIN only once since all URIs must have it the same. */ |
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492 if (token_pin != NULL) |
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493 goto ok; |
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494 |
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495 if (pk11_get_pin_caching_policy() == POLICY_MEMORY) |
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496 if ((token_pin = strdup(pin)) == NULL) |
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497 { |
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498 PK11err(PK11_F_CACHE_PIN, PK11_R_MALLOC_FAILURE); |
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499 goto err; |
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500 } |
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501 else |
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502 if (pk11_get_pin_caching_policy() == POLICY_MLOCKED_MEMORY) |
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503 { |
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504 if (mlock_pin_in_memory(pin) == 0) |
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505 goto err; |
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506 } |
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507 |
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508 ok: |
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509 (void) pthread_mutex_unlock(uri_lock); |
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510 return (1); |
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511 err: |
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512 (void) pthread_mutex_unlock(uri_lock); |
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513 return (0); |
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514 } |
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515 |
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516 /* |
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517 * Cache the PIN in mlock(3C)ed memory. If mlock(3C) fails we will not resort to |
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518 * the normal memory caching. |
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519 * |
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520 * Note that this function must be called under the protection of the "uri_lock" |
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521 * mutex. |
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522 * |
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523 * Returns: |
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524 * 1 on success |
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525 * 0 on failure |
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526 */ |
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527 static int |
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528 mlock_pin_in_memory(char *pin) |
|
529 { |
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530 void *addr = NULL; |
|
531 long pagesize = 0; |
|
532 |
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533 /* mlock(3C) locks pages so we need one whole page for the PIN. */ |
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534 if ((pagesize = sysconf(_SC_PAGESIZE)) == -1) |
|
535 { |
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536 PK11err(PK11_F_MLOCK_PIN_IN_MEMORY, PK11_R_SYSCONF_FAILED); |
|
537 goto err; |
|
538 } |
|
539 |
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540 /* This will ensure we have a page aligned pointer... */ |
|
541 if ((addr = mmap(0, pagesize, PROT_READ | PROT_WRITE, |
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542 MAP_PRIVATE | MAP_ANON, -1, 0)) == MAP_FAILED) |
|
543 { |
|
544 PK11err(PK11_F_MLOCK_PIN_IN_MEMORY, PK11_R_MMAP_FAILED); |
|
545 goto err; |
|
546 } |
|
547 |
|
548 /* ...because "addr" must be page aligned here. */ |
|
549 if (mlock(addr, pagesize) == -1) |
|
550 { |
|
551 /* |
|
552 * Missing the PRIV_PROC_LOCK_MEMORY privilege might be a common |
|
553 * problem so distinguish this situation from other issues. |
|
554 */ |
|
555 if (errno == EPERM) |
|
556 PK11err(PK11_F_MLOCK_PIN_IN_MEMORY, |
|
557 PK11_R_PRIV_PROC_LOCK_MEMORY_MISSING); |
|
558 else |
|
559 PK11err(PK11_F_MLOCK_PIN_IN_MEMORY, |
|
560 PK11_R_MLOCK_FAILED); |
|
561 |
|
562 /* |
|
563 * We already have a problem here so there is no need to check |
|
564 * that we could unmap the page. The PIN is not there yet |
|
565 * anyway. |
|
566 */ |
|
567 (void) munmap(addr, pagesize); |
|
568 goto err; |
|
569 } |
|
570 |
|
571 /* Copy the PIN to the mlocked memory. */ |
|
572 token_pin = (char *)addr; |
|
573 strlcpy(token_pin, pin, PK11_MAX_PIN_LEN + 1); |
|
574 return (1); |
|
575 err: |
|
576 return (0); |
|
577 } |
|
578 |
|
579 /* |
|
580 * Log in to the keystore if we are supposed to do that at all. Take care of |
|
581 * reading and caching the PIN etc. Log in only once even when called from |
|
582 * multiple threads. |
|
583 * |
|
584 * Returns: |
|
585 * 1 on success |
|
586 * 0 on failure |
|
587 */ |
|
588 int |
|
589 pk11_token_login(CK_SESSION_HANDLE session, CK_BBOOL *login_done, |
|
590 pkcs11_uri *uri_struct, CK_BBOOL is_private) |
|
591 { |
|
592 CK_RV rv; |
|
593 |
|
594 if ((pubkey_token_flags & CKF_TOKEN_INITIALIZED) == 0) |
|
595 { |
|
596 PK11err(PK11_F_TOKEN_LOGIN, |
|
597 PK11_R_TOKEN_NOT_INITIALIZED); |
|
598 goto err; |
|
599 } |
|
600 |
|
601 /* |
|
602 * If login is required or needed but the PIN has not been even |
|
603 * initialized we can bail out right now. Note that we are supposed to |
|
604 * always log in if we are going to access private keys. However, we may |
|
605 * need to log in even for accessing public keys in case that the |
|
606 * CKF_LOGIN_REQUIRED flag is set. |
|
607 */ |
|
608 if ((pubkey_token_flags & CKF_LOGIN_REQUIRED || |
|
609 is_private == CK_TRUE) && ~pubkey_token_flags & |
|
610 CKF_USER_PIN_INITIALIZED) |
|
611 { |
|
612 PK11err(PK11_F_TOKEN_LOGIN, PK11_R_TOKEN_PIN_NOT_SET); |
|
613 goto err; |
|
614 } |
|
615 |
|
616 /* |
|
617 * Note on locking: it is possible that more than one thread gets into |
|
618 * pk11_get_pin() so we must deal with that. We cannot avoid it since we |
|
619 * cannot guard fork() in there with a lock because we could end up in |
|
620 * a dead lock in the child. Why? Remember we are in a multithreaded |
|
621 * environment so we must lock all mutexes in the prefork function to |
|
622 * avoid a situation in which a thread that did not call fork() held a |
|
623 * lock, making future unlocking impossible. We lock right before |
|
624 * C_Login(). |
|
625 */ |
|
626 if (pubkey_token_flags & CKF_LOGIN_REQUIRED || is_private == CK_TRUE) |
|
627 { |
|
628 if (*login_done == CK_FALSE && |
|
629 uri_struct->askpass == NULL) |
|
630 { |
|
631 PK11err(PK11_F_TOKEN_LOGIN, |
|
632 PK11_R_TOKEN_PIN_NOT_PROVIDED); |
|
633 goto err; |
|
634 } |
|
635 |
|
636 if (*login_done == CK_FALSE && |
|
637 uri_struct->askpass != NULL) |
|
638 { |
|
639 if (pk11_get_pin(uri_struct->askpass, |
|
640 &uri_struct->pin) == 0) |
|
641 { |
|
642 PK11err(PK11_F_TOKEN_LOGIN, |
|
643 PK11_R_TOKEN_PIN_NOT_PROVIDED); |
|
644 goto err; |
|
645 } |
|
646 } |
|
647 |
|
648 /* |
|
649 * Note that what we are logging into is the keystore from |
|
650 * pubkey_SLOTID because we work with OP_RSA session type here. |
|
651 * That also means that we can work with only one keystore in |
|
652 * the engine. |
|
653 * |
|
654 * We must make sure we do not try to login more than once. |
|
655 * Also, see the comment above on locking strategy. |
|
656 */ |
|
657 (void) pthread_mutex_lock(uri_lock); |
|
658 if (*login_done == CK_FALSE) |
|
659 { |
|
660 if ((rv = pFuncList->C_Login(session, |
|
661 CKU_USER, (CK_UTF8CHAR*)uri_struct->pin, |
|
662 strlen(uri_struct->pin))) != CKR_OK) |
|
663 { |
|
664 PK11err_add_data(PK11_F_TOKEN_LOGIN, |
|
665 PK11_R_TOKEN_LOGIN_FAILED, rv); |
|
666 goto err_locked; |
|
667 } |
|
668 |
|
669 *login_done = CK_TRUE; |
|
670 |
|
671 /* |
|
672 * Cache the passphrasedialog for possible child (which |
|
673 * would need to relogin). |
|
674 */ |
|
675 if (passphrasedialog == NULL && |
|
676 uri_struct->askpass != NULL) |
|
677 { |
|
678 passphrasedialog = |
|
679 strdup(uri_struct->askpass); |
|
680 |
|
681 if (passphrasedialog == NULL) |
|
682 { |
|
683 PK11err_add_data(PK11_F_TOKEN_LOGIN, |
|
684 PK11_R_MALLOC_FAILURE, rv); |
|
685 goto err_locked; |
|
686 } |
|
687 } |
|
688 |
|
689 /* |
|
690 * Check the PIN caching policy. Note that user might |
|
691 * have provided a PIN even when no PIN was required - |
|
692 * in that case we always remove the PIN from memory. |
|
693 */ |
|
694 if (pk11_get_pin_caching_policy() == |
|
695 POLICY_WRONG_VALUE) |
|
696 { |
|
697 PK11err(PK11_F_TOKEN_LOGIN, |
|
698 PK11_R_PIN_CACHING_POLICY_INVALID); |
|
699 goto err_locked; |
|
700 } |
|
701 |
|
702 if (pk11_get_pin_caching_policy() != POLICY_NONE) |
|
703 if (pk11_cache_pin(uri_struct->pin) == 0) |
|
704 goto err_locked; |
|
705 } |
|
706 (void) pthread_mutex_unlock(uri_lock); |
|
707 } |
|
708 else |
|
709 { |
|
710 /* |
|
711 * If token does not require login we take it as the |
|
712 * login was done. |
|
713 */ |
|
714 *login_done = CK_TRUE; |
|
715 } |
|
716 |
|
717 /* |
|
718 * If we raced at pk11_get_pin() we must make sure that all threads that |
|
719 * called pk11_get_pin() will erase the PIN from memory, not just the |
|
720 * one that called C_Login(). Note that if we were supposed to cache the |
|
721 * PIN it was already cached by now so filling "uri_struct.pin" with |
|
722 * zero bytes is always OK since pk11_cache_pin() makes a copy of it. |
|
723 */ |
|
724 if (uri_struct->pin != NULL) |
|
725 memset(uri_struct->pin, 0, strlen(uri_struct->pin)); |
|
726 |
|
727 return (1); |
|
728 |
|
729 err_locked: |
|
730 (void) pthread_mutex_unlock(uri_lock); |
|
731 err: |
|
732 /* Always get rid of the PIN. */ |
|
733 if (uri_struct->pin != NULL) |
|
734 memset(uri_struct->pin, 0, strlen(uri_struct->pin)); |
|
735 return (0); |
|
736 } |
|
737 |
|
738 /* |
|
739 * Log in to the keystore in the child if we were logged in in the parent. There |
|
740 * are similarities in the code with pk11_token_login() but still it is quite |
|
741 * different so we need a separate function for this. |
|
742 * |
|
743 * Note that this function is called under the locked session mutex when fork is |
|
744 * detected. That means that C_Login() will be called from the child just once. |
|
745 * |
|
746 * Returns: |
|
747 * 1 on success |
|
748 * 0 on failure |
|
749 */ |
|
750 int |
|
751 pk11_token_relogin(CK_SESSION_HANDLE session) |
|
752 { |
|
753 CK_RV rv; |
|
754 |
|
755 /* |
|
756 * We are in the child so check if we should login to the token again. |
|
757 * Note that it is enough to log in to the token through one session |
|
758 * only, all already open and all future sessions can access the token |
|
759 * then. |
|
760 */ |
|
761 if (passphrasedialog != NULL) |
|
762 { |
|
763 char *pin = NULL; |
|
764 |
|
765 /* If we cached the PIN then use it. */ |
|
766 if (token_pin != NULL) |
|
767 pin = token_pin; |
|
768 else if (pk11_get_pin(passphrasedialog, &pin) == 0) |
|
769 goto err; |
|
770 |
|
771 (void) pthread_mutex_lock(uri_lock); |
|
772 if ((rv = pFuncList->C_Login(session, CKU_USER, |
|
773 (CK_UTF8CHAR_PTR)pin, strlen(pin))) != CKR_OK) |
|
774 { |
|
775 PK11err_add_data(PK11_F_TOKEN_RELOGIN, |
|
776 PK11_R_TOKEN_LOGIN_FAILED, rv); |
|
777 (void) pthread_mutex_unlock(uri_lock); |
|
778 goto err; |
|
779 } |
|
780 (void) pthread_mutex_unlock(uri_lock); |
|
781 |
|
782 /* Forget the PIN now if we did not cache it before. */ |
|
783 if (pin != token_pin) |
|
784 { |
|
785 memset(pin, 0, strlen(pin)); |
|
786 OPENSSL_free(pin); |
|
787 } |
|
788 } |
|
789 |
|
790 return (1); |
|
791 err: |
|
792 return (0); |
|
793 } |
|
794 |
|
795 /* |
|
796 * This function forks and runs an external command. It would be nice if we |
|
797 * could use popen(3C)/pclose(3C) for that but unfortunately we need to be able |
|
798 * to get rid of the PIN from the memory. With p(open|close) function calls we |
|
799 * cannot control the stdio's memory used for buffering and our tests showed |
|
800 * that the PIN really stays there even after pclose(). |
|
801 * |
|
802 * Returns: |
|
803 * allocated buffer on success |
|
804 * NULL on failure |
|
805 */ |
|
806 static char * |
|
807 run_askpass(char *dialog) |
|
808 { |
|
809 pid_t pid; |
|
810 int n, p[2]; |
|
811 char *buf = NULL; |
|
812 |
|
813 if (pipe(p) == -1) |
|
814 { |
|
815 PK11err(PK11_F_RUN_ASKPASS, PK11_R_PIPE_FAILED); |
|
816 return (NULL); |
|
817 } |
|
818 |
|
819 switch (pid = fork()) |
|
820 { |
|
821 case -1: |
|
822 PK11err(PK11_F_RUN_ASKPASS, PK11_R_FORK_FAILED); |
|
823 return (NULL); |
|
824 /* child */ |
|
825 case 0: |
|
826 /* |
|
827 * This should make sure that dup2() will not fail on |
|
828 * file descriptor shortage. |
|
829 */ |
|
830 close(p[0]); |
|
831 (void) dup2(p[1], 1); |
|
832 close(p[1]); |
|
833 /* |
|
834 * Note that we cannot use PK11err() here since we are |
|
835 * in the child. However, parent will get read() error |
|
836 * so do not worry. |
|
837 */ |
|
838 (void) execl(dialog, basename(dialog), NULL); |
|
839 exit(1); |
|
840 /* parent */ |
|
841 default: |
|
842 /* +1 is for the terminating '\0' */ |
|
843 buf = (char *)OPENSSL_malloc(PK11_MAX_PIN_LEN + 1); |
|
844 if (buf == NULL) |
|
845 { |
|
846 PK11err(PK11_F_RUN_ASKPASS, |
|
847 PK11_R_MALLOC_FAILURE); |
|
848 return (NULL); |
|
849 } |
|
850 |
|
851 close(p[1]); |
|
852 n = read(p[0], buf, PK11_MAX_PIN_LEN); |
|
853 if (n == -1 || n == 0) |
|
854 { |
|
855 PK11err(PK11_F_RUN_ASKPASS, |
|
856 PK11_R_PIN_NOT_READ_FROM_COMMAND); |
|
857 OPENSSL_free(buf); |
|
858 return (NULL); |
|
859 } |
|
860 buf[n] = '\0'; |
|
861 |
|
862 (void) waitpid(pid, NULL, 0); |
|
863 } |
|
864 |
|
865 return (buf); |
|
866 } |
|
867 |
|
868 #endif /* OPENSSL_NO_HW_PK11 */ |
|
869 #endif /* OPENSSL_NO_HW */ |
|