Line data Source code
1 : /* run-decrypt.c - Helper to perform a verify operation
2 : Copyright (C) 2009 g10 Code GmbH
3 : 2016 Intevation GmbH
4 :
5 : This file is part of GPGME.
6 :
7 : GPGME is free software; you can redistribute it and/or modify it
8 : under the terms of the GNU Lesser General Public License as
9 : published by the Free Software Foundation; either version 2.1 of
10 : the License, or (at your option) any later version.
11 :
12 : GPGME is distributed in the hope that it will be useful, but
13 : WITHOUT ANY WARRANTY; without even the implied warranty of
14 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 : Lesser General Public License for more details.
16 :
17 : You should have received a copy of the GNU Lesser General Public
18 : License along with this program; if not, see <https://www.gnu.org/licenses/>.
19 : */
20 :
21 : /* We need to include config.h so that we know whether we are building
22 : with large file system (LFS) support. */
23 : #ifdef HAVE_CONFIG_H
24 : #include <config.h>
25 : #endif
26 :
27 : #include <stdlib.h>
28 : #include <stdio.h>
29 : #include <string.h>
30 :
31 : #include <gpgme.h>
32 :
33 : #define PGM "run-decrypt"
34 :
35 : #include "run-support.h"
36 :
37 :
38 : static int verbose;
39 :
40 : static gpg_error_t
41 0 : status_cb (void *opaque, const char *keyword, const char *value)
42 : {
43 : (void)opaque;
44 0 : fprintf (stderr, "status_cb: %s %s\n", keyword, value);
45 0 : return 0;
46 : }
47 :
48 :
49 : static void
50 0 : print_result (gpgme_decrypt_result_t result)
51 : {
52 : gpgme_recipient_t recp;
53 0 : int count = 0;
54 :
55 0 : printf ("Original file name: %s\n", nonnull(result->file_name));
56 0 : printf ("Wrong key usage: %i\n", result->wrong_key_usage);
57 0 : printf ("Unsupported algorithm: %s\n",
58 0 : nonnull(result->unsupported_algorithm));
59 0 : if (result->session_key)
60 0 : printf ("Session key: %s\n", result->session_key);
61 :
62 0 : for (recp = result->recipients; recp->next; recp = recp->next)
63 : {
64 0 : printf ("recipient %d\n", count++);
65 0 : printf (" status ....: %s\n", gpgme_strerror (recp->status));
66 0 : printf (" keyid: %s\n", nonnull (recp->keyid));
67 0 : printf (" algo ...: %s\n", gpgme_pubkey_algo_name (recp->pubkey_algo));
68 : }
69 0 : }
70 :
71 :
72 : static int
73 0 : show_usage (int ex)
74 : {
75 0 : fputs ("usage: " PGM " [options] FILE\n\n"
76 : "Options:\n"
77 : " --verbose run in verbose mode\n"
78 : " --status print status lines from the backend\n"
79 : " --openpgp use the OpenPGP protocol (default)\n"
80 : " --cms use the CMS protocol\n"
81 : " --export-session-key show the session key\n"
82 : " --override-session-key STRING use STRING as session key\n"
83 : , stderr);
84 0 : exit (ex);
85 : }
86 :
87 :
88 : int
89 0 : main (int argc, char **argv)
90 : {
91 0 : int last_argc = -1;
92 : gpgme_error_t err;
93 : gpgme_ctx_t ctx;
94 0 : gpgme_protocol_t protocol = GPGME_PROTOCOL_OpenPGP;
95 0 : FILE *fp_in = NULL;
96 0 : gpgme_data_t in = NULL;
97 0 : gpgme_data_t out = NULL;
98 : gpgme_decrypt_result_t result;
99 0 : int print_status = 0;
100 0 : int export_session_key = 0;
101 0 : const char *override_session_key = NULL;
102 :
103 0 : if (argc)
104 0 : { argc--; argv++; }
105 :
106 0 : while (argc && last_argc != argc )
107 : {
108 0 : last_argc = argc;
109 0 : if (!strcmp (*argv, "--"))
110 : {
111 0 : argc--; argv++;
112 0 : break;
113 : }
114 0 : else if (!strcmp (*argv, "--help"))
115 0 : show_usage (0);
116 0 : else if (!strcmp (*argv, "--verbose"))
117 : {
118 0 : verbose = 1;
119 0 : argc--; argv++;
120 : }
121 0 : else if (!strcmp (*argv, "--status"))
122 : {
123 0 : print_status = 1;
124 0 : argc--; argv++;
125 : }
126 0 : else if (!strcmp (*argv, "--openpgp"))
127 : {
128 0 : protocol = GPGME_PROTOCOL_OpenPGP;
129 0 : argc--; argv++;
130 : }
131 0 : else if (!strcmp (*argv, "--cms"))
132 : {
133 0 : protocol = GPGME_PROTOCOL_CMS;
134 0 : argc--; argv++;
135 : }
136 0 : else if (!strcmp (*argv, "--export-session-key"))
137 : {
138 0 : export_session_key = 1;
139 0 : argc--; argv++;
140 : }
141 0 : else if (!strcmp (*argv, "--override-session-key"))
142 : {
143 0 : argc--; argv++;
144 0 : if (!argc)
145 0 : show_usage (1);
146 0 : override_session_key = *argv;
147 0 : argc--; argv++;
148 : }
149 0 : else if (!strncmp (*argv, "--", 2))
150 0 : show_usage (1);
151 :
152 : }
153 :
154 0 : if (argc < 1 || argc > 2)
155 0 : show_usage (1);
156 :
157 0 : fp_in = fopen (argv[0], "rb");
158 0 : if (!fp_in)
159 : {
160 0 : err = gpgme_error_from_syserror ();
161 0 : fprintf (stderr, PGM ": can't open `%s': %s\n",
162 : argv[0], gpgme_strerror (err));
163 0 : exit (1);
164 : }
165 :
166 0 : init_gpgme (protocol);
167 :
168 0 : err = gpgme_new (&ctx);
169 0 : fail_if_err (err);
170 0 : gpgme_set_protocol (ctx, protocol);
171 0 : if (print_status)
172 : {
173 0 : gpgme_set_status_cb (ctx, status_cb, NULL);
174 0 : gpgme_set_ctx_flag (ctx, "full-status", "1");
175 : }
176 0 : if (export_session_key)
177 : {
178 0 : err = gpgme_set_ctx_flag (ctx, "export-session-key", "1");
179 0 : if (err)
180 : {
181 0 : fprintf (stderr, PGM ": error requesting exported session key: %s\n",
182 : gpgme_strerror (err));
183 0 : exit (1);
184 : }
185 : }
186 0 : if (override_session_key)
187 : {
188 0 : err = gpgme_set_ctx_flag (ctx, "override-session-key",
189 : override_session_key);
190 0 : if (err)
191 : {
192 0 : fprintf (stderr, PGM ": error overriding session key: %s\n",
193 : gpgme_strerror (err));
194 0 : exit (1);
195 : }
196 : }
197 :
198 0 : err = gpgme_data_new_from_stream (&in, fp_in);
199 0 : if (err)
200 : {
201 0 : fprintf (stderr, PGM ": error allocating data object: %s\n",
202 : gpgme_strerror (err));
203 0 : exit (1);
204 : }
205 :
206 0 : err = gpgme_data_new (&out);
207 0 : if (err)
208 : {
209 0 : fprintf (stderr, PGM ": error allocating data object: %s\n",
210 : gpgme_strerror (err));
211 0 : exit (1);
212 : }
213 :
214 0 : err = gpgme_op_decrypt (ctx, in, out);
215 0 : result = gpgme_op_decrypt_result (ctx);
216 0 : if (err)
217 : {
218 0 : fprintf (stderr, PGM ": decrypt failed: %s\n", gpgme_strerror (err));
219 0 : exit (1);
220 : }
221 0 : if (result)
222 : {
223 0 : print_result (result);
224 0 : print_data (out);
225 : }
226 :
227 0 : gpgme_data_release (out);
228 0 : gpgme_data_release (in);
229 :
230 0 : gpgme_release (ctx);
231 0 : return 0;
232 : }
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