Line data Source code
1 : /* decrypt.c - decrypt and verify data
2 : * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
3 : * 2007, 2009 Free Software Foundation, Inc.
4 : *
5 : * This file is part of GnuPG.
6 : *
7 : * GnuPG is free software; you can redistribute it and/or modify
8 : * it under the terms of the GNU General Public License as published by
9 : * the Free Software Foundation; either version 3 of the License, or
10 : * (at your option) any later version.
11 : *
12 : * GnuPG is distributed in the hope that it will be useful,
13 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : * GNU General Public License for more details.
16 : *
17 : * You should have received a copy of the GNU General Public License
18 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
19 : */
20 :
21 : #include <config.h>
22 : #include <stdio.h>
23 : #include <stdlib.h>
24 : #include <string.h>
25 : #include <errno.h>
26 :
27 : #include "gpg.h"
28 : #include "options.h"
29 : #include "packet.h"
30 : #include "status.h"
31 : #include "iobuf.h"
32 : #include "keydb.h"
33 : #include "util.h"
34 : #include "main.h"
35 : #include "status.h"
36 : #include "i18n.h"
37 :
38 : /* Assume that the input is an encrypted message and decrypt
39 : * (and if signed, verify the signature on) it.
40 : * This command differs from the default operation, as it never
41 : * writes to the filename which is included in the file and it
42 : * rejects files which don't begin with an encrypted message.
43 : */
44 : int
45 12 : decrypt_message (ctrl_t ctrl, const char *filename)
46 : {
47 : IOBUF fp;
48 12 : armor_filter_context_t *afx = NULL;
49 : progress_filter_context_t *pfx;
50 : int rc;
51 12 : int no_out = 0;
52 :
53 12 : pfx = new_progress_context ();
54 :
55 : /* Open the message file. */
56 12 : fp = iobuf_open (filename);
57 12 : if (fp && is_secured_file (iobuf_get_fd (fp)))
58 : {
59 0 : iobuf_close (fp);
60 0 : fp = NULL;
61 0 : gpg_err_set_errno (EPERM);
62 : }
63 12 : if ( !fp )
64 : {
65 0 : rc = gpg_error_from_syserror ();
66 0 : log_error (_("can't open '%s': %s\n"), print_fname_stdin(filename),
67 : gpg_strerror (rc));
68 0 : release_progress_context (pfx);
69 0 : return rc;
70 : }
71 :
72 12 : handle_progress (pfx, fp, filename);
73 :
74 12 : if ( !opt.no_armor )
75 : {
76 12 : if ( use_armor_filter( fp ) )
77 : {
78 0 : afx = new_armor_context ();
79 0 : push_armor_filter ( afx, fp );
80 : }
81 : }
82 :
83 12 : if (!opt.outfile)
84 : {
85 12 : no_out = 1;
86 12 : opt.outfile = "-";
87 : }
88 12 : rc = proc_encryption_packets (ctrl, NULL, fp );
89 12 : if (no_out)
90 12 : opt.outfile = NULL;
91 :
92 12 : iobuf_close (fp);
93 12 : release_armor_context (afx);
94 12 : release_progress_context (pfx);
95 12 : return rc;
96 : }
97 :
98 :
99 : /* Same as decrypt_message but takes a file descriptor for input and
100 : output. */
101 : gpg_error_t
102 0 : decrypt_message_fd (ctrl_t ctrl, int input_fd, int output_fd)
103 : {
104 : #ifdef HAVE_W32_SYSTEM
105 : /* No server mode yet. */
106 : (void)ctrl;
107 : (void)input_fd;
108 : (void)output_fd;
109 : return gpg_error (GPG_ERR_NOT_IMPLEMENTED);
110 : #else
111 : gpg_error_t err;
112 : IOBUF fp;
113 0 : armor_filter_context_t *afx = NULL;
114 : progress_filter_context_t *pfx;
115 :
116 0 : if (opt.outfp)
117 0 : return gpg_error (GPG_ERR_BUG);
118 :
119 0 : pfx = new_progress_context ();
120 :
121 : /* Open the message file. */
122 0 : fp = iobuf_fdopen_nc (FD2INT(input_fd), "rb");
123 0 : if (fp && is_secured_file (iobuf_get_fd (fp)))
124 : {
125 0 : iobuf_close (fp);
126 0 : fp = NULL;
127 0 : gpg_err_set_errno (EPERM);
128 : }
129 0 : if (!fp)
130 : {
131 : char xname[64];
132 :
133 0 : err = gpg_error_from_syserror ();
134 0 : snprintf (xname, sizeof xname, "[fd %d]", input_fd);
135 0 : log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (err));
136 0 : release_progress_context (pfx);
137 0 : return err;
138 : }
139 :
140 : #ifdef HAVE_W32CE_SYSTEM
141 : #warning Need to fix this if we want to use g13
142 : opt.outfp = NULL;
143 : #else
144 0 : opt.outfp = es_fdopen_nc (output_fd, "wb");
145 : #endif
146 0 : if (!opt.outfp)
147 : {
148 : char xname[64];
149 :
150 0 : err = gpg_error_from_syserror ();
151 0 : snprintf (xname, sizeof xname, "[fd %d]", output_fd);
152 0 : log_error (_("can't open '%s': %s\n"), xname, gpg_strerror (err));
153 0 : iobuf_close (fp);
154 0 : release_progress_context (pfx);
155 0 : return err;
156 : }
157 :
158 0 : if (!opt.no_armor)
159 : {
160 0 : if (use_armor_filter (fp))
161 : {
162 0 : afx = new_armor_context ();
163 0 : push_armor_filter ( afx, fp );
164 : }
165 : }
166 :
167 0 : err = proc_encryption_packets (ctrl, NULL, fp );
168 :
169 0 : iobuf_close (fp);
170 0 : es_fclose (opt.outfp);
171 0 : opt.outfp = NULL;
172 0 : release_armor_context (afx);
173 0 : release_progress_context (pfx);
174 0 : return err;
175 : #endif
176 : }
177 :
178 :
179 : void
180 0 : decrypt_messages (ctrl_t ctrl, int nfiles, char *files[])
181 : {
182 : IOBUF fp;
183 0 : armor_filter_context_t *afx = NULL;
184 : progress_filter_context_t *pfx;
185 0 : char *p, *output = NULL;
186 0 : int rc=0,use_stdin=0;
187 0 : unsigned int lno=0;
188 :
189 0 : if (opt.outfile)
190 : {
191 0 : log_error(_("--output doesn't work for this command\n"));
192 0 : return;
193 : }
194 :
195 0 : pfx = new_progress_context ();
196 :
197 0 : if(!nfiles)
198 0 : use_stdin=1;
199 :
200 : for(;;)
201 : {
202 : char line[2048];
203 0 : char *filename=NULL;
204 :
205 0 : if(use_stdin)
206 : {
207 0 : if(fgets(line, DIM(line), stdin))
208 : {
209 0 : lno++;
210 0 : if (!*line || line[strlen(line)-1] != '\n')
211 0 : log_error("input line %u too long or missing LF\n", lno);
212 : else
213 : {
214 0 : line[strlen(line)-1] = '\0';
215 0 : filename=line;
216 : }
217 : }
218 : }
219 : else
220 : {
221 0 : if(nfiles)
222 : {
223 0 : filename=*files;
224 0 : nfiles--;
225 0 : files++;
226 : }
227 : }
228 :
229 0 : if(filename==NULL)
230 0 : break;
231 :
232 0 : print_file_status(STATUS_FILE_START, filename, 3);
233 0 : output = make_outfile_name(filename);
234 0 : if (!output)
235 0 : goto next_file;
236 0 : fp = iobuf_open(filename);
237 0 : if (fp)
238 0 : iobuf_ioctl (fp, IOBUF_IOCTL_NO_CACHE, 1, NULL);
239 0 : if (fp && is_secured_file (iobuf_get_fd (fp)))
240 : {
241 0 : iobuf_close (fp);
242 0 : fp = NULL;
243 0 : gpg_err_set_errno (EPERM);
244 : }
245 0 : if (!fp)
246 : {
247 0 : log_error(_("can't open '%s'\n"), print_fname_stdin(filename));
248 0 : goto next_file;
249 : }
250 :
251 0 : handle_progress (pfx, fp, filename);
252 :
253 0 : if (!opt.no_armor)
254 : {
255 0 : if (use_armor_filter(fp))
256 : {
257 0 : afx = new_armor_context ();
258 0 : push_armor_filter ( afx, fp );
259 : }
260 : }
261 0 : rc = proc_packets (ctrl,NULL, fp);
262 0 : iobuf_close(fp);
263 0 : if (rc)
264 0 : log_error("%s: decryption failed: %s\n", print_fname_stdin(filename),
265 : gpg_strerror (rc));
266 0 : p = get_last_passphrase();
267 0 : set_next_passphrase(p);
268 0 : xfree (p);
269 :
270 : next_file:
271 : /* Note that we emit file_done even after an error. */
272 0 : write_status( STATUS_FILE_DONE );
273 0 : xfree(output);
274 0 : reset_literals_seen();
275 0 : }
276 :
277 0 : set_next_passphrase(NULL);
278 0 : release_armor_context (afx);
279 0 : release_progress_context (pfx);
280 : }
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