Mercurial > ~mikael > mcabber > hg

annotate mcabber/src/pgp.c @ 1665:1a4890514eb9

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Clean up some dead assignments/dead variables
author Ulrich Spörlein
date Tue, 02 Feb 2010 19:44:39 +0100
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children
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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) 2006-2009 Mikael Berthe <mikael@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,
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59 "GPGME initialization error: Bad library version");
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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 // GCC ignores casts to void, thus we need to hack around that
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154 static inline void ignore(void*x) {}
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155
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156 // passphrase_cb()
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157 // GPGME passphrase callback function.
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158 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint,
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159 const char *passphrase_info, int prev_was_bad, int fd)
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160 {
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161 ssize_t len;
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162
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163 // Abort if we do not have the password.
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164 if (!gpg.passphrase) {
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165 ignore((void*)write(fd, "\n", 1)); // We have an error anyway, thus it does
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166 // not matter if we fail again.
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167 return gpg_error(GPG_ERR_CANCELED);
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168 }
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169
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170 // Write the passphrase to the file descriptor.
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171 len = strlen(gpg.passphrase);
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172 if (write(fd, gpg.passphrase, len) != len)
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173 return gpg_error(GPG_ERR_CANCELED);
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174 if (write(fd, "\n", 1) != 1)
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175 return gpg_error(GPG_ERR_CANCELED);
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176
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177 return 0; // Success
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178 }
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179
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180 // gpg_verify(gpg_data, text, *sigsum)
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181 // Verify that gpg_data is a correct signature for text.
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182 // Return the key id (or fingerprint), and set *sigsum to
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183 // the gpgme signature summary value.
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184 // The returned string must be freed with g_free() after use.
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185 char *gpg_verify(const char *gpg_data, const char *text,
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186 gpgme_sigsum_t *sigsum)
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187 {
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188 gpgme_ctx_t ctx;
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189 gpgme_data_t data_sign, data_text;
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190 char *data;
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191 char *verified_key = NULL;
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192 gpgme_key_t key;
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193 gpgme_error_t err;
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194 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n";
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195 const char suffix[] = "\n-----END PGP SIGNATURE-----\n";
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196
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197 // Reset the summary.
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198 *sigsum = 0;
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199
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200 if (!gpg.enabled)
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201 return NULL;
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202
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203 err = gpgme_new(&ctx);
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204 if (err) {
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205 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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206 "GPGME error: %s", gpgme_strerror(err));
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207 return NULL;
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208 }
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209
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210 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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211
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212 // Surround the given data with the prefix & suffix
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213 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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214 strcpy(data, prefix);
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215 strcat(data, gpg_data);
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216 strcat(data, suffix);
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217
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218 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0);
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219 if (!err) {
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220 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0);
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221 if (!err) {
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222 err = gpgme_op_verify(ctx, data_sign, data_text, 0);
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223 if (!err) {
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224 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx);
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225 if (vr && vr->signatures) {
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226 char *r = vr->signatures->fpr;
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227 // Found the fingerprint. Let's try to get the key id.
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228 if (!gpgme_get_key(ctx, r, &key, 0) && key) {
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229 r = key->subkeys->keyid;
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230 gpgme_key_release(key);
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231 }
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232 // r is a static variable, let's copy it.
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233 verified_key = g_strdup(r);
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234 *sigsum = vr->signatures->summary;
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235 // For some reason summary could be 0 when status is 0 too,
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236 // which means the signature is valid...
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237 if (!*sigsum && !vr->signatures->status)
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238 *sigsum = GPGME_SIGSUM_GREEN;
1041
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239 }
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240 }
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241 gpgme_data_release(data_text);
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242 }
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243 gpgme_data_release(data_sign);
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244 }
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245 if (err)
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246 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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247 "GPGME verification error: %s", gpgme_strerror(err));
1041
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248 gpgme_release(ctx);
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249 g_free(data);
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250 return verified_key;
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251 }
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252
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253 // gpg_sign(gpg_data)
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254 // Return a signature of gpg_data (or NULL).
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255 // The returned string must be freed with g_free() after use.
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256 char *gpg_sign(const char *gpg_data)
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257 {
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258 gpgme_ctx_t ctx;
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259 gpgme_data_t in, out;
1238
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260 char *p;
1041
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261 char *signed_data = NULL;
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262 size_t nread;
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263 gpgme_key_t key;
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264 gpgme_error_t err;
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265
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266 if (!gpg.enabled || !gpg.private_key)
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267 return NULL;
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268
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269 err = gpgme_new(&ctx);
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270 if (err) {
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271 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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272 "GPGME error: %s", gpgme_strerror(err));
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273 return NULL;
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274 }
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275
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276 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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277 gpgme_set_textmode(ctx, 0);
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278 gpgme_set_armor(ctx, 1);
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279
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280 p = getenv("GPG_AGENT_INFO");
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281 if (!(p && strchr(p, ':')))
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282 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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283
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284 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
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285 if (err || !key) {
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286 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
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287 gpgme_release(ctx);
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288 return NULL;
1041
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289 }
1049
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290
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291 gpgme_signers_clear(ctx);
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292 gpgme_signers_add(ctx, key);
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293 gpgme_key_release(key);
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parents: 1047
diff changeset
294 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
295 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
296 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
297 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
298 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
299 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
300 signed_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
301 if (signed_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
302 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
303 char *dd = g_strndup(signed_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
304 free(signed_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
305 signed_data = strip_header_footer(dd);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
306 g_free(dd);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
307 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
308 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
309 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
310 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
311 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
312 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
313 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
314 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
315 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
316 "GPGME signature error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
317 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
318 return signed_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
319 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
320
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
321 // gpg_decrypt(gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
322 // Return decrypted gpg_data (or NULL).
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
323 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
324 char *gpg_decrypt(const char *gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
325 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
326 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
327 gpgme_data_t in, out;
1238
80008fe2a4f2 Re-enable gpg-agent (revert 591d8b35c881)
Mikael Berthe <mikael@lilotux.net>
parents: 1223
diff changeset
328 char *p, *data;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
329 char *decrypted_data = NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
330 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
331 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
332 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
333 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
334
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
335 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
336 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
337
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
338 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
339 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
340 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
341 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
342 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
343 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
344
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
345 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
346
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
347 p = getenv("GPG_AGENT_INFO");
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
348 if (!(p && strchr(p, ':')))
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
349 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
350
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
351 // Surround the given data with the prefix & suffix
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
352 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
353 strcpy(data, prefix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
354 strcat(data, gpg_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
355 strcat(data, suffix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
356
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
357 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
358 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
359 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
360 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
361 err = gpgme_op_decrypt(ctx, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
362 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
363 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
364 if (decrypted_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
365 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
366 char *dd = g_strndup(decrypted_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
367 free(decrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
368 decrypted_data = dd;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
369 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
370 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
371 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
372 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
373 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
374 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
375 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
376 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
377 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
378 "GPGME decryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
379 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
380 g_free(data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
381 return decrypted_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
382 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
383
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
384 // gpg_encrypt(gpg_data, keyid)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
385 // Return encrypted gpg_data with the key keyid (or NULL).
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
386 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
387 char *gpg_encrypt(const char *gpg_data, const char *keyid)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
388 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
389 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
390 gpgme_data_t in, out;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
391 char *encrypted_data = NULL, *edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
392 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
393 gpgme_key_t key;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
394 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
395
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
396 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
397 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
398
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
399 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
400 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
401 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
402 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
403 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
405
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
407 gpgme_set_textmode(ctx, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
408 gpgme_set_armor(ctx, 1);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
409
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
410 err = gpgme_get_key(ctx, keyid, &key, 0);
1105
265e1d873d3e PGP: Improve checks for missing keys
Mikael Berthe <mikael@lilotux.net>
parents: 1057
diff changeset
411 if (!err && key) {
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
412 gpgme_key_t keys[] = { key, 0 };
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
413 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
414 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
417 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
418 if (!err)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
419 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
420 else
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
421 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
422 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
423 gpgme_data_release(in);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
424 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
425 gpgme_key_release(key);
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
426 } else {
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
427 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: key not found");
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
428 err = 0;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
429 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
430 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
431 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
432 "GPGME encryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
433 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
434 edata = strip_header_footer(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
435 if (encrypted_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
436 free(encrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
437 return edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
438 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
439
d4b97a2423eb Introduce PGP utility functions
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440 // gpg_test_passphrase()
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441 // Test the current gpg.passphrase with gpg.private_key.
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442 // If the test doesn't succeed, the passphrase is cleared and a non-null
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443 // value is returned.
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444 int gpg_test_passphrase(void)
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445 {
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446 char *s;
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447
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448 if (!gpg.private_key)
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449 return -1; // No private key...
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450
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451 s = gpg_sign("test");
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452 if (s) {
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453 free(s);
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454 return 0; // Ok, test successful
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455 }
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456 // The passphrase is wrong (if provided)
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457 gpg_set_passphrase(NULL);
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458 return -1;
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459 }
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460
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461 int gpg_enabled(void)
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462 {
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463 return gpg.enabled;
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464 }
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465
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466 #else /* not HAVE_GPGME */
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467
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468 int gpg_enabled(void)
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469 {
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470 return 0;
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471 }
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472
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473 #endif /* HAVE_GPGME */
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474
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475 /* vim: set expandtab cindent cinoptions=>2\:2(0: For Vim users... */