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annotate mcabber/mcabber/pgp.c @ 2188:84252c616919

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PGP: Encrypt messages with our own PGP key when carbons are enabled
author Mikael Berthe <mikael@lilotux.net>
date Sun, 04 Oct 2015 19:04:43 +0200
parents e3b66c8ead4f
children 40ddaebeb81e
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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) 2006-2015 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 // gpg_get_private_key_id()
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122 // Return the current private key id (static string).
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123 const char *gpg_get_private_key_id(void)
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124 {
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125 return gpg.private_key;
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126 }
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127
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128 // strip_header_footer(data)
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129 // Remove PGP header & footer from data.
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130 // Return a new string, or NULL.
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131 // The string must be freed by the caller with g_free() when no longer needed.
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132 static char *strip_header_footer(const char *data)
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133 {
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134 char *p, *q;
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135
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136 if (!data)
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137 return NULL;
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138
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139 // p: beginning of real data
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140 // q: end of real data
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141
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142 // Strip header (to the first empty line)
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143 p = strstr(data, "\n\n");
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144 if (!p)
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145 return g_strdup(data);
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146
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147 // Strip footer
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148 // We want to remove the last lines, until the line beginning with a '-'
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149 p += 2;
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150 for (q = p ; *q; q++) ;
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151 // (q is at the end of data now)
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152 for (q--; q > p && (*q != '\n' || *(q+1) != '-'); q--) ;
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153
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154 if (q <= p)
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155 return NULL; // Shouldn't happen...
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156
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157 return g_strndup(p, q-p);
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158 }
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159
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160 // GCC ignores casts to void, thus we need to hack around that
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161 static inline void ignore(void*x) {}
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162
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163 // passphrase_cb()
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164 // GPGME passphrase callback function.
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165 static gpgme_error_t passphrase_cb(void *hook, const char *uid_hint,
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166 const char *passphrase_info, int prev_was_bad, int fd)
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167 {
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168 ssize_t len;
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169
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170 // Abort if we do not have the password.
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171 if (!gpg.passphrase) {
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172 ignore((void*)write(fd, "\n", 1)); // We have an error anyway, thus it does
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173 // not matter if we fail again.
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174 return gpg_error(GPG_ERR_CANCELED);
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175 }
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176
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177 // Write the passphrase to the file descriptor.
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178 len = strlen(gpg.passphrase);
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179 if (write(fd, gpg.passphrase, len) != len)
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180 return gpg_error(GPG_ERR_CANCELED);
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181 if (write(fd, "\n", 1) != 1)
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182 return gpg_error(GPG_ERR_CANCELED);
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183
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184 return 0; // Success
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185 }
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186
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187 // gpg_verify(gpg_data, text, *sigsum)
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188 // Verify that gpg_data is a correct signature for text.
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189 // Return the key id (or fingerprint), and set *sigsum to
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190 // the gpgme signature summary value.
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191 // The returned string must be freed with g_free() after use.
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192 char *gpg_verify(const char *gpg_data, const char *text,
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193 gpgme_sigsum_t *sigsum)
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194 {
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195 gpgme_ctx_t ctx;
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196 gpgme_data_t data_sign, data_text;
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197 char *data;
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198 char *verified_key = NULL;
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199 gpgme_key_t key;
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200 gpgme_error_t err;
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201 const char prefix[] = "-----BEGIN PGP SIGNATURE-----\n\n";
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202 const char suffix[] = "\n-----END PGP SIGNATURE-----\n";
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203
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204 // Reset the summary.
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205 *sigsum = 0;
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206
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207 if (!gpg.enabled)
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208 return NULL;
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209
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210 err = gpgme_new(&ctx);
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211 if (err) {
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212 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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213 "GPGME error: %s", gpgme_strerror(err));
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214 return NULL;
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215 }
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216
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217 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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218
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219 // Surround the given data with the prefix & suffix
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220 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
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221 strcpy(data, prefix);
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222 strcat(data, gpg_data);
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223 strcat(data, suffix);
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224
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225 err = gpgme_data_new_from_mem(&data_sign, data, strlen(data), 0);
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226 if (!err) {
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227 err = gpgme_data_new_from_mem(&data_text, text, strlen(text), 0);
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228 if (!err) {
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229 err = gpgme_op_verify(ctx, data_sign, data_text, 0);
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230 if (!err) {
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231 gpgme_verify_result_t vr = gpgme_op_verify_result(ctx);
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232 if (vr && vr->signatures) {
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233 char *r = vr->signatures->fpr;
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234 // Found the fingerprint. Let's try to get the key id.
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235 if (!gpgme_get_key(ctx, r, &key, 0) && key) {
1041
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236 r = key->subkeys->keyid;
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237 gpgme_key_release(key);
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238 }
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239 // r is a static variable, let's copy it.
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240 verified_key = g_strdup(r);
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241 *sigsum = vr->signatures->summary;
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242 // For some reason summary could be 0 when status is 0 too,
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243 // which means the signature is valid...
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244 if (!*sigsum && !vr->signatures->status)
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245 *sigsum = GPGME_SIGSUM_GREEN;
1041
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246 }
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247 }
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248 gpgme_data_release(data_text);
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249 }
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250 gpgme_data_release(data_sign);
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251 }
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252 if (err)
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253 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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254 "GPGME verification error: %s", gpgme_strerror(err));
1041
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255 gpgme_release(ctx);
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256 g_free(data);
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257 return verified_key;
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258 }
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259
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260 // gpg_sign(gpg_data)
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261 // Return a signature of gpg_data (or NULL).
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262 // The returned string must be freed with g_free() after use.
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263 char *gpg_sign(const char *gpg_data)
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264 {
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265 gpgme_ctx_t ctx;
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266 gpgme_data_t in, out;
1238
80008fe2a4f2 Re-enable gpg-agent (revert 591d8b35c881)
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267 char *p;
1041
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268 char *signed_data = NULL;
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269 size_t nread;
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270 gpgme_key_t key;
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271 gpgme_error_t err;
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272
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273 if (!gpg.enabled || !gpg.private_key)
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274 return NULL;
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275
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276 err = gpgme_new(&ctx);
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277 if (err) {
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278 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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279 "GPGME error: %s", gpgme_strerror(err));
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280 return NULL;
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281 }
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282
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283 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
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284 gpgme_set_textmode(ctx, 0);
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285 gpgme_set_armor(ctx, 1);
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286
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287 p = getenv("GPG_AGENT_INFO");
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288 if (!(p && strchr(p, ':')))
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289 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
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290
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291 err = gpgme_get_key(ctx, gpg.private_key, &key, 1);
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292 if (err || !key) {
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parents: 1047
diff changeset
293 scr_LogPrint(LPRINT_LOGNORM, "GPGME error: private key not found");
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
294 gpgme_release(ctx);
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
295 return NULL;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
296 }
1049
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
297
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
298 gpgme_signers_clear(ctx);
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
299 gpgme_signers_add(ctx, key);
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
300 gpgme_key_release(key);
ad5de4d1ee56 PGP: Give a more useful error message when the private key isn't found
Mikael Berthe <mikael@lilotux.net>
parents: 1047
diff changeset
301 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
302 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
303 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
304 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
305 err = gpgme_op_sign(ctx, in, out, GPGME_SIG_MODE_DETACH);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
306 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
307 signed_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
308 if (signed_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
309 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
310 char *dd = g_strndup(signed_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
311 free(signed_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
312 signed_data = strip_header_footer(dd);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
313 g_free(dd);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
314 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
315 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
316 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
317 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
318 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
319 gpgme_data_release(in);
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 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
322 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
323 "GPGME signature error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
324 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
325 return signed_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
326 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
327
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
328 // gpg_decrypt(gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
329 // Return decrypted gpg_data (or NULL).
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
330 // The returned string must be freed with g_free() after use.
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
331 char *gpg_decrypt(const char *gpg_data)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
332 {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
333 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
334 gpgme_data_t in, out;
1238
80008fe2a4f2 Re-enable gpg-agent (revert 591d8b35c881)
Mikael Berthe <mikael@lilotux.net>
parents: 1223
diff changeset
335 char *p, *data;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
336 char *decrypted_data = NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
337 size_t nread;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
338 gpgme_error_t err;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
339 const char prefix[] = "-----BEGIN PGP MESSAGE-----\n\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
340 const char suffix[] = "\n-----END PGP MESSAGE-----\n";
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
341
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
342 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
343 return NULL;
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 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
346 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
347 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
348 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
349 return NULL;
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
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
352 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
353
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
354 p = getenv("GPG_AGENT_INFO");
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
355 if (!(p && strchr(p, ':')))
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
356 gpgme_set_passphrase_cb(ctx, passphrase_cb, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
357
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
358 // Surround the given data with the prefix & suffix
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
359 data = g_new(char, sizeof(prefix) + sizeof(suffix) + strlen(gpg_data));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
360 strcpy(data, prefix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
361 strcat(data, gpg_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
362 strcat(data, suffix);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
363
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
364 err = gpgme_data_new_from_mem(&in, data, strlen(data), 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
365 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
366 err = gpgme_data_new(&out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
367 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
368 err = gpgme_op_decrypt(ctx, in, out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
369 if (!err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
370 decrypted_data = gpgme_data_release_and_get_mem(out, &nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
371 if (decrypted_data) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
372 // We need to add a trailing NULL
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
373 char *dd = g_strndup(decrypted_data, nread);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
374 free(decrypted_data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
375 decrypted_data = dd;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
376 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
377 } else {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
378 gpgme_data_release(out);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
379 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
380 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
381 gpgme_data_release(in);
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 if (err && err != GPG_ERR_CANCELED)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
384 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
1047
0dc104d51dce PGP: Better error messages
Mikael Berthe <mikael@lilotux.net>
parents: 1041
diff changeset
385 "GPGME decryption error: %s", gpgme_strerror(err));
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
386 gpgme_release(ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
387 g_free(data);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
388 return decrypted_data;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
389 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
390
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
391 // gpg_encrypt(gpg_data, keyids[], n)
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
392 // Return encrypted gpg_data with the n keys from the keyids array (or NULL).
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
393 // The returned string must be freed with g_free() after use.
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
394 char *gpg_encrypt(const char *gpg_data, const char *keyids[], size_t nkeys)
1041
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 gpgme_ctx_t ctx;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
397 gpgme_data_t in, out;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
398 char *encrypted_data = NULL, *edata;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
399 size_t nread;
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
400 gpgme_key_t *keys;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
401 gpgme_error_t err;
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
402 unsigned i;
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
403
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
404 if (!gpg.enabled)
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
405 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
406
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
407 if (!keyids || !nkeys) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
408 return NULL;
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
409 }
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
410
1041
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
411 err = gpgme_new(&ctx);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
412 if (err) {
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
413 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
414 "GPGME error: %s", gpgme_strerror(err));
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
415 return NULL;
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
416 }
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
417
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
418 gpgme_set_protocol(ctx, GPGME_PROTOCOL_OpenPGP);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
419 gpgme_set_textmode(ctx, 0);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
420 gpgme_set_armor(ctx, 1);
d4b97a2423eb Introduce PGP utility functions
Mikael Berthe <mikael@lilotux.net>
parents:
diff changeset
421
2187
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
422 keys = g_new0(gpgme_key_t, 1+nkeys);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
423
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
424 for (i = 0; i < nkeys; i++) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
425 err = gpgme_get_key(ctx, keyids[i], &keys[i], 0);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
426 if (err || !keys[i]) {
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
427 scr_LogPrint(LPRINT_LOGNORM, "GPGME encryption error: cannot use key %s",
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
428 keyids[i]);
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
429 // We need to have err not null to ensure we won't try to encrypt
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
430 // without this key.
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
diff changeset
431 if (!err) err = GPG_ERR_UNKNOWN_ERRNO;
e3b66c8ead4f PGP: Change gpg_encrypt() so that several encryption keys can be used
Mikael Berthe <mikael@lilotux.net>
parents: 1811
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432 break;
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433 }
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434 }
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435
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436 if (!err) {
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437 err = gpgme_data_new_from_mem(&in, gpg_data, strlen(gpg_data), 0);
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438 if (!err) {
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439 err = gpgme_data_new(&out);
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440 if (!err) {
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441 err = gpgme_op_encrypt(ctx, keys, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
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442 if (!err)
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443 encrypted_data = gpgme_data_release_and_get_mem(out, &nread);
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444 else
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445 gpgme_data_release(out);
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446 }
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447 gpgme_data_release(in);
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448 }
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449
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450 if (err && err != GPG_ERR_CANCELED) {
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451 scr_LogPrint(LPRINT_LOGNORM|LPRINT_NOTUTF8,
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452 "GPGME encryption error: %s", gpgme_strerror(err));
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453 }
1041
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454 }
2187
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455
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456 for (i = 0; keys[i]; i++)
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457 gpgme_key_release(keys[i]);
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458 g_free(keys);
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459 gpgme_release(ctx);
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460 edata = strip_header_footer(encrypted_data);
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461 if (encrypted_data)
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462 free(encrypted_data);
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463 return edata;
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464 }
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465
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466 // gpg_test_passphrase()
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467 // Test the current gpg.passphrase with gpg.private_key.
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468 // If the test doesn't succeed, the passphrase is cleared and a non-null
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469 // value is returned.
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470 int gpg_test_passphrase(void)
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471 {
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472 char *s;
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473
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474 if (!gpg.private_key)
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475 return -1; // No private key...
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476
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477 s = gpg_sign("test");
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478 if (s) {
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479 free(s);
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480 return 0; // Ok, test successful
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481 }
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482 // The passphrase is wrong (if provided)
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483 gpg_set_passphrase(NULL);
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484 return -1;
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485 }
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486
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487 int gpg_enabled(void)
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488 {
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489 return gpg.enabled;
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490 }
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491
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492 #else /* not HAVE_GPGME */
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493
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494 int gpg_enabled(void)
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495 {
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496 return 0;
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497 }
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498
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499 #endif /* HAVE_GPGME */
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500
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501 /* vim: set et cindent cinoptions=>2\:2(0 ts=2 sw=2: For Vim users... */