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annotate mcabber/src/pgp.c @ 1049:ad5de4d1ee56

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PGP: Give a more useful error message when the private key isn't found
author Mikael Berthe <mikael@lilotux.net>
date Sun, 26 Nov 2006 20:08:18 +0100
parents 0dc104d51dce
children 082d55152a25
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1 /*
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2 * pgp.c -- PGP utility functions
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3 *
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4 * Copyright (C) 2006 Mikael Berthe <bmikael@lists.lilotux.net>
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5 * Some parts inspired by centericq (impgp.cc)
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6 *
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7 * This program is free software; you can redistribute it and/or modify
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8 * it under the terms of the GNU General Public License as published by
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9 * the Free Software Foundation; either version 2 of the License, or (at
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10 * your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU General Public License
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18 * along with this program; if not, write to the Free Software
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19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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20 * USA
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21 */
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22
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23 #include <config.h>
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24
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25 #ifdef HAVE_GPGME
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26
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27 #include <stdlib.h>
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28 #include <string.h>
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29 #include <unistd.h>
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30 #include <locale.h>
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31 #include <sys/mman.h>
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32 #include <glib.h>
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33
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34 #include "pgp.h"
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35 #include "logprint.h"
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36
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37 #define MIN_GPGME_VERSION "1.0.0"
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38
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39 static struct gpg_struct
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40 {
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41 int enabled;
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42 char *private_key;
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43 char *passphrase;
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44 } gpg;
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45
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46
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47 // gpg_init(priv_key, passphrase)
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48 // Initialize the GPG sub-systems. This function must be invoked early.
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49 // Note: priv_key & passphrase are optional, they can be set later.
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50 // This function returns 0 if gpgme is available and initialized;
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51 // if not it returns the gpgme error code.
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52 int gpg_init(const char *priv_key, const char *passphrase)
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53 {
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54 gpgme_error_t err;
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55
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56 // Check for version and OpenPGP protocol support.
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57 if (!gpgme_check_version(MIN_GPGME_VERSION)) {
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58 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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59 "GPGME initialization error: %s", gpgme_strerror(err));
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60 return -1;
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61 }
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62
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63 err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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64 if (err) {
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65 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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66 "GPGME initialization error: %s", gpgme_strerror(err));
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67 return err;
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68 }
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69
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70 // Set the locale information.
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71 gpgme_set_locale(NULL, LC_CTYPE, setlocale(LC_CTYPE, NULL));
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72 gpgme_set_locale(NULL, LC_MESSAGES, setlocale(LC_MESSAGES, NULL));
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73
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74 // Store private data.
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75 gpg_set_private_key(priv_key);
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76 gpg_set_passphrase(passphrase);
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77
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78 gpg.enabled = 1;
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79 return 0;
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80 }
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81
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82 // gpg_terminate()
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83 // Destroy data and free memory.
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84 void gpg_terminate(void)
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85 {
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86 gpg.enabled = 0;
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87 gpg_set_passphrase(NULL);
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88 gpg_set_private_key(NULL);
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89 }
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90
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91 // gpg_set_passphrase(passphrase)
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92 // Set the current passphrase (use NULL to erase it).
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93 void gpg_set_passphrase(const char *passphrase)
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94 {
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95 // Remove current passphrase
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96 if (gpg.passphrase) {
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97 ssize_t len = strlen(gpg.passphrase);
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98 memset(gpg.passphrase, 0, len);
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99 munlock(gpg.passphrase, len);
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100 g_free(gpg.passphrase);
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101 }
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102 if (passphrase) {
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103 gpg.passphrase = g_strdup(passphrase);
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104 mlock(gpg.passphrase, strlen(gpg.passphrase));
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105 } else {
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106 gpg.passphrase = NULL;
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107 }
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108 }
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109
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110 // gpg_set_private_key(keyid)
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111 // Set the current private key id (use NULL to unset it).
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112 void gpg_set_private_key(const char *priv_keyid)
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113 {
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114 g_free(gpg.private_key);
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115 if (priv_keyid)
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116 gpg.private_key = g_strdup(priv_keyid);
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117 else
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118 gpg.private_key = NULL;
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119 }
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120
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121 // strip_header_footer(data)
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122 // Remove PGP header & footer from data.
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123 // Return a new string, or NULL.
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124 // The string must be freed by the caller with g_free() when no longer needed.
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125 static char *strip_header_footer(const char *data)
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126 {
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127 char *p, *q;
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128
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129 if (!data)
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130 return NULL;
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131
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132 // p: beginning of real data
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133 // q: end of real data
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134
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135 // Strip header (to the first empty line)
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136 p = strstr(data, "\n\n");
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137 if (!p)
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138 return g_strdup(data);
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139
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140 // Strip footer
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141 // We want to remove the last lines, until the line beginning with a '-'
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142 p += 2;
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143 for (q = p ; *q; q++) ;
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144 // (q is at the end of data now)
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145 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ;
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146
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147 if (q <= p)
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148 return NULL; // Shouldn't happen...
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149
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150 return g_strndup(p, q-p);
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151 }
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152
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153 // passphrase_cb()
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154 // GPGME passphrase callback function.
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155 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint,
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156 const char *passphrase_info, int prev_was_bad, int fd)
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157 {
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158 ssize_t len;
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159
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160 // Abort if we do not have the password.
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161 if (!gpg.passphrase) {
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162 write(fd, "\n", 1);
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163 return gpg_error(GPG_ERR_CANCELED);
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164 }
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165
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166 // Write the passphrase to the file descriptor.
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167 len = strlen(gpg.passphrase);
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168 if (write(fd, gpg.passphrase, len) != len)
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169 return gpg_error(GPG_ERR_CANCELED);
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170 if (write(fd, "\n", 1) != 1)
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171 return gpg_error(GPG_ERR_CANCELED);
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172
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173 return 0; // Success
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174 }
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175
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176 // gpg_verify(gpg_data, text, *sigsum)
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177 // Verify that gpg_data is a correct signature for text.
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178 // Return the key id (or fingerprint), and set *sigsum to
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179 // the gpgme signature summary value.
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180 // The returned string must be freed with g_free() after use.
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181 char *gpg_verify(const char *gpg_data, const char *text,
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182 gpgme_sigsum_t *sigsum)
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183 {
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184 gpgme_ctx_t ctx;
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185 gpgme_data_t data_sign, data_text;
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186 char *data;
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187 char *verified_key = NULL;
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188 gpgme_key_t key;
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189 gpgme_error_t err;
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190 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n";
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191 const char suffix[] = "\n-----END PGP SIGNATURE-----\n";
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192
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193 // Reset the summary.
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194 *sigsum = 0;
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195
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196 if (!gpg.enabled)
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197 return NULL;
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198
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199 err = gpgme_new(&ctx);
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200 if (err) {
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201 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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202 "GPGME error: %s", gpgme_strerror(err));
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203 return NULL;
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204 }
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205
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206 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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207
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208 // Surround the given data with the prefix & suffix
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209 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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210 strcpy(data, prefix);
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211 strcat(data, gpg_data);
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212 strcat(data, suffix);
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213
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214 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0);
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215 if (!err) {
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216 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0);
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217 if (!err) {
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218 err = gpgme_op_verify(ctx, data_sign, data_text, 0);
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219 if (!err) {
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220 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx);
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221 if (vr && vr->signatures) {
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222 char *r = vr->signatures->fpr;
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223 // Found the fingerprint. Let's try to get the key id.
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224 if(!gpgme_get_key(ctx, r, &key, 0)) {
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225 r = key->subkeys->keyid;
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226 gpgme_key_release(key);
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227 }
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228 // r is a static variable, let's copy it.
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229 verified_key = g_strdup(r);
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230 *sigsum = vr->signatures->summary;
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231 }
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232 }
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233 gpgme_data_release(data_text);
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234 }
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235 gpgme_data_release(data_sign);
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236 }
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237 if (err)
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238 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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239 "GPGME verification error: %s", gpgme_strerror(err));
1041
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240 gpgme_release(ctx);
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241 g_free(data);
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242 return verified_key;
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243 }
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244
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245 // gpg_sign(gpg_data)
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246 // Return a signature of gpg_data (or NULL).
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247 // The returned string must be freed with g_free() after use.
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248 char *gpg_sign(const char *gpg_data)
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249 {
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250 gpgme_ctx_t ctx;
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251 gpgme_data_t in, out;
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252 char *p;
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253 char *signed_data = NULL;
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254 size_t nread;
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255 gpgme_key_t key;
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256 gpgme_error_t err;
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257
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258 if (!gpg.enabled || !gpg.private_key)
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259 return NULL;
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260
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261 err = gpgme_new(&ctx);
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262 if (err) {
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263 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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264 "GPGME error: %s", gpgme_strerror(err));
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265 return NULL;
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266 }
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267
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268 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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269 gpgme_set_textmode(ctx, 0);
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270 gpgme_set_armor(ctx, 1);
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271
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272 p = getenv("GPG_AGENT_INFO");
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273 if (!(p && strchr(p, ':')))
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274 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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275
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276 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
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277 if (err) {
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278 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
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279 gpgme_release(ctx);
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280 return NULL;
1041
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281 }
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282
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283 gpgme_signers_clear(ctx);
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284 gpgme_signers_add(ctx, key);
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285 gpgme_key_release(key);
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286 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
1041
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287 if (!err) {
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288 err = gpgme_data_new(&out);
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289 if (!err) {
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290 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
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291 if (!err) {
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292 signed_data = gpgme_data_release_and_get_mem(out, &nread);
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diff changeset
293 if (signed_data) {
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294 // We need to add a trailing NULL
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295 char *dd = g_strndup(signed_data, nread);
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diff changeset
296 free(signed_data);
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297 signed_data = strip_header_footer(dd);
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298 g_free(dd);
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299 }
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300 } else {
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301 gpgme_data_release(out);
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302 }
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303 }
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parents:
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304 gpgme_data_release(in);
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305 }
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306 if (err && err != GPG_ERR_CANCELED)
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307 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
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308 "GPGME signature error: %s", gpgme_strerror(err));
1041
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309 gpgme_release(ctx);
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310 return signed_data;
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311 }
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312
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313 // gpg_decrypt(gpg_data)
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314 // Return decrypted gpg_data (or NULL).
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315 // The returned string must be freed with g_free() after use.
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316 char *gpg_decrypt(const char *gpg_data)
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317 {
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318 gpgme_ctx_t ctx;
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319 gpgme_data_t in, out;
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320 char *p, *data;
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321 char *decrypted_data = NULL;
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322 size_t nread;
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323 gpgme_error_t err;
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324 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
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325 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
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326
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327 if (!gpg.enabled)
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328 return NULL;
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329
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330 err = gpgme_new(&ctx);
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331 if (err) {
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332 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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333 "GPGME error: %s", gpgme_strerror(err));
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334 return NULL;
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335 }
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336
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337 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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338
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339 p = getenv("GPG_AGENT_INFO");
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340 if (!(p && strchr(p, ':')))
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341 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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342
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343 // Surround the given data with the prefix & suffix
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344 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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diff changeset
345 strcpy(data, prefix);
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diff changeset
346 strcat(data, gpg_data);
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347 strcat(data, suffix);
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diff changeset
348
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349 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
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diff changeset
350 if (!err) {
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diff changeset
351 err = gpgme_data_new(&out);
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parents:
diff changeset
352 if (!err) {
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diff changeset
353 err = gpgme_op_decrypt(ctx, in, out);
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diff changeset
354 if (!err) {
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diff changeset
355 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
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diff changeset
356 if (decrypted_data) {
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parents:
diff changeset
357 // We need to add a trailing NULL
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diff changeset
358 char *dd = g_strndup(decrypted_data, nread);
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diff changeset
359 free(decrypted_data);
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360 decrypted_data = dd;
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diff changeset
361 }
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parents:
diff changeset
362 } else {
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parents:
diff changeset
363 gpgme_data_release(out);
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parents:
diff changeset
364 }
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parents:
diff changeset
365 }
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diff changeset
366 gpgme_data_release(in);
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parents:
diff changeset
367 }
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parents:
diff changeset
368 if (err && err != GPG_ERR_CANCELED)
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369 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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parents: 1041
diff changeset
370 "GPGME decryption error: %s", gpgme_strerror(err));
1041
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diff changeset
371 gpgme_release(ctx);
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parents:
diff changeset
372 g_free(data);
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diff changeset
373 return decrypted_data;
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374 }
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diff changeset
375
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376 // gpg_encrypt(gpg_data, keyid)
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parents:
diff changeset
377 // Return encrypted gpg_data with the key keyid (or NULL).
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diff changeset
378 // The returned string must be freed with g_free() after use.
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diff changeset
379 char *gpg_encrypt(const char *gpg_data, const char *keyid)
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parents:
diff changeset
380 {
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parents:
diff changeset
381 gpgme_ctx_t ctx;
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parents:
diff changeset
382 gpgme_data_t in, out;
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parents:
diff changeset
383 char *encrypted_data = NULL, *edata;
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parents:
diff changeset
384 size_t nread;
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parents:
diff changeset
385 gpgme_key_t key;
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parents:
diff changeset
386 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
387
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parents:
diff changeset
388 if (!gpg.enabled)
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parents:
diff changeset
389 return NULL;
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parents:
diff changeset
390
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parents:
diff changeset
391 err = gpgme_new(&ctx);
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parents:
diff changeset
392 if (err) {
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parents:
diff changeset
393 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
394 "GPGME error: %s", gpgme_strerror(err));
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parents:
diff changeset
395 return NULL;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
396 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
397
d4b97a2423eb Introduce PGP utility functions
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diff changeset
398 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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parents:
diff changeset
399 gpgme_set_textmode(ctx, 0);
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parents:
diff changeset
400 gpgme_set_armor(ctx, 1);
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parents:
diff changeset
401
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
402 err = gpgme_get_key(ctx, keyid, &key, 0);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
403 if (!err) {
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 gpgme_key_t keys[] = { key, 0 };
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
405 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
407 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
408 if (!err) {
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
409 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
410 if (!err)
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
411 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
412 else
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parents:
diff changeset
413 gpgme_data_release(out);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
414 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 gpgme_data_release(in);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 }
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
417 gpgme_key_release(key);
1047
0dc104d51dce PGP: Better error messages
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diff changeset
418 } else {
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
419 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: key not found");
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
420 err = 0;
1041
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parents:
diff changeset
421 }
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
422 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
423 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
424 "GPGME encryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
425 gpgme_release(ctx);
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
426 edata = strip_header_footer(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
427 if (encrypted_data)
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
428 free(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
429 return edata;
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
430 }
d4b97a2423eb Introduce PGP utility functions
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parents:
diff changeset
431
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parents:
diff changeset
432 // gpg_test_passphrase()
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parents:
diff changeset
433 // Test the current gpg.passphrase with gpg.private_key.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
434 // If the test doesn't succeed, the passphrase is cleared and a non-null
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
435 // value is returned.
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Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
436 int gpg_test_passphrase(void)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
437 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
438 char *s;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
439
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
440 if (!gpg.private_key)
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441 return -1; // No private key...
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442
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443 s = gpg_sign("test");
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444 if (s) {
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445 free(s);
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446 return 0; // Ok, test successful
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447 }
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448 // The passphrase is wrong (if provided)
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449 gpg_set_passphrase(NULL);
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450 return -1;
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451 }
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452
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453 inline int gpg_enabled(void)
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454 {
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455 return gpg.enabled;
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456 }
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457
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458 #else /* not HAVE_GPGME */
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459
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460 inline int gpg_enabled(void)
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461 {
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462 return 0;
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463 }
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464
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465 #endif /* HAVE_GPGME */
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466
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467 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */