masqmail: 9b93c0a3bd8c src/accept.c

masqmail

view src/accept.c @ 411:9b93c0a3bd8c

Ensure lvals, rvals and components of address strucs are stripped.

author	markus schnalke <meillo@marmaro.de>
date	Wed, 29 Feb 2012 12:06:33 +0100
parents	aa40710f09fe
children

line source

1 /*

2 ** MasqMail

5 **

6 ** This program is free software; you can redistribute it and/or modify

7 ** it under the terms of the GNU General Public License as published by

8 ** the Free Software Foundation; either version 2 of the License, or

9 ** (at your option) any later version.

10 **

11 ** This program is distributed in the hope that it will be useful,

12 ** but WITHOUT ANY WARRANTY; without even the implied warranty of

13 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

14 ** GNU General Public License for more details.

15 **

16 ** You should have received a copy of the GNU General Public License

17 ** along with this program; if not, write to the Free Software

18 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

19 */

21 #include "masqmail.h"

22 #include "readsock.h"

24 /* must match PROT_* in masqmail.h */

25 gchar *prot_names[] = {

26 "local",

27 "SMTP",

28 "ESMTP",

29 "(unknown)" /* should not happen, but better than crashing. */

30 };

32 static gchar*

33 string_base62(gchar *res, guint value, gchar len)

34 {

35 static gchar base62_chars[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

36 "abcdefghijklmnopqrstuvwxyz";

37 gchar *p = res + len;

38 *p = '\0';

39 while (p > res) {

40 *(--p) = base62_chars[value % 62];

41 value /= 62;

42 }

43 return res;

44 }

46 /*

47 ** accept message from anywhere.

48 ** A message from local is indicated by msg->recieved_host == NULL

49 **

50 ** The -t option: With the ACC_RCPT_FROM_HEAD flag the addrs found found

51 ** in To/Cc/Bcc headers are added to the recipient list.

52 */

53 accept_error

54 accept_message_stream(FILE *in, message *msg, guint flags)

55 {

56 gchar *line, *line1;

57 int line_size = MAX_DATALINE;

58 gboolean in_headers = TRUE;

59 header *hdr = NULL;

60 gint line_cnt = 0, data_size = 0;

62 line = g_malloc(line_size);

63 *line = '\0';

65 while (1) {

66 int len = read_sockline1(in, &line, &line_size, 5 * 60,

67 READSOCKL_CVT_CRLF);

68 line1 = line;

70 if ((*line == '.') && (!(flags & ACC_DOT_IGNORE))) {

71 if (line[1] == '\n') {

72 g_free(line);

73 break;

74 }

75 line1++;

76 }

78 if (len==-1 && (flags & (ACC_DOT_IGNORE | ACC_NODOT_RELAX))) {

79 /* at EOF but last line was not terminated by CR */

80 /* some MUAs allow unterminated lines */

81 gint len1 = strlen(line1);

82 if (len1 > 0 && line1[len1-1] != '\n') {

83 line1[len1] = '\n';

84 line1[len1+1] = '\0';

85 msg->data_list = g_list_prepend(msg->data_list,

86 g_strdup(line1));

87 data_size += strlen(line1);

88 line_cnt++;

89 }

90 break;

92 } else if (len == -1) {

93 g_free(line);

94 return AERR_EOF;

96 } else if (len == -2) {

97 /* should not happen any more */

98 g_free(line);

99 return AERR_OVERFLOW;

100

101 } else if (len == -3) {

102 g_free(line);

103 return AERR_TIMEOUT;

104

105 } else if (len <= 0) {

106 /* does not happen */

107 g_free(line);

108 DEBUG(5) debugf("read_sockline returned %d\n", len);

109 return AERR_UNKNOWN;

110

111 }

112

113 if (in_headers) {

114 /* some pop servers send the 'From ' line, skip it: */

115 if (!msg->hdr_list && strncmp(line1, "From ", 5)==0) {

116 continue;

117 }

118

119 if (*line1 == ' ' || *line1 == '\t') {

120 /* continuation of 'folded' header: */

121 if (hdr) {

122 char *cp;

123 cp = g_strconcat(hdr->header, line1,

124 NULL);

125 hdr->value = cp + (hdr->value -

126 hdr->header);

127 free(hdr->header);

128 hdr->header = cp;

129 }

130 } else if (*line1 == '\n') {

131 /* an empty line marks end of headers */

132 in_headers = FALSE;

133

134 } else if ((hdr = get_header(line1))) {

135 /* another header */

136 msg->hdr_list = g_list_append(msg->hdr_list, hdr);

137 } else {

138 /*

139 ** Should be another header but none was

140 ** recognized, so this seems to be the first

141 ** data line of a broken mailer which does

142 ** not add an empty line after the headers.

143 */

144 in_headers = FALSE;

145 msg->data_list = g_list_prepend(msg->data_list,

146 g_strdup(line1));

147 }

148 } else {

149 /* message body */

150 msg->data_list = g_list_prepend(msg->data_list,

151 g_strdup(line1));

152 data_size += strlen(line1);

153 line_cnt++;

154 }

155

156 if (conf.max_msg_size && (data_size > conf.max_msg_size)) {

157 DEBUG(4) debugf("accept_message_stream(): "

158 "received %d bytes (conf.max_msg_size=%d)\n",

159 data_size, conf.max_msg_size);

160 return AERR_SIZE;

161 }

162 }

163 DEBUG(4) debugf("received %d lines of data (%d bytes)\n",

164 line_cnt, data_size);

165

166 if (!msg->data_list) {

167 /* make sure data list is not NULL */

168 msg->data_list = g_list_append(NULL, g_strdup(""));

169 }

170 msg->data_list = g_list_reverse(msg->data_list);

171

172 /* we have succesfully received the mail data */

173

174 msg->data_size = data_size;

175 msg->received_time = time(NULL);

176

177 return AERR_OK;

178 }

179

180 static void

181 ensure_return_path(message *msg)

182 {

183 GList *hdr_list;

184 header *hdr;

185 gchar *addr;

186

187 if (msg->return_path) {

188 return;

189 }

190

191 DEBUG(3) debugf("return_path == NULL\n");

192

193 hdr_list = find_header(msg->hdr_list, HEAD_SENDER, NULL);

194 if (!hdr_list) {

195 hdr_list = find_header(msg->hdr_list, HEAD_FROM, NULL);

196 }

197 if (hdr_list) {

198 hdr = (header *) (g_list_first(hdr_list)->data);

199

200 DEBUG(5) debugf("hdr->value = '%s'\n", hdr->value);

201

202 addr = g_strstrip(g_strdup(hdr->value));

203 msg->return_path = create_address_qualified(addr,

204 FALSE, msg->received_host);

205 if (msg->return_path) {

206 DEBUG(3) debugf("setting return_path to %s\n",

207 addr_string(msg->return_path));

208 msg->hdr_list = g_list_append(msg->hdr_list,

209 create_header(HEAD_UNKNOWN,

210 "X-Warning: return path set from %s "

211 "address\n",

212 (hdr->id == HEAD_SENDER) ?

213 "Sender:" : "From:"));

214 }

215 g_free(addr);

216 }

217 if (!msg->return_path) {

218 /* no Sender: or From: or create_address_qualified failed */

219 msg->return_path = create_address_qualified("postmaster",

220 TRUE, conf.host_name);

221 DEBUG(3) debugf("setting return_path to %s\n",

222 addr_string(msg->return_path));

223 msg->hdr_list = g_list_append(msg->hdr_list,

224 create_header(HEAD_UNKNOWN,

225 "X-Warning: real return path is unknown\n"));

226 }

227 }

228

229 static accept_error

230 scan_headers(message *msg, guint flags)

231 {

232 gboolean has_id = FALSE;

233 gboolean has_date = FALSE;

234 gboolean has_sender = FALSE;

235 gboolean has_from = FALSE;

236 gboolean has_to_or_cc = FALSE;

237 GList *hdr_node, *hdr_node_next;

238 header *hdr;

239

240 for (hdr_node = g_list_first(msg->hdr_list); hdr_node;

241 hdr_node = hdr_node_next) {

242 hdr_node_next = g_list_next(hdr_node);

243 hdr = ((header *) (hdr_node->data));

244 DEBUG(5) debugf("scanning headers: %s", hdr->header);

245 switch (hdr->id) {

246 case HEAD_MESSAGE_ID:

247 has_id = TRUE;

248 break;

249 case HEAD_DATE:

250 has_date = TRUE;

251 break;

252 case HEAD_FROM:

253 has_from = TRUE;

254 break;

255 case HEAD_SENDER:

256 has_sender = TRUE;

257 break;

258 case HEAD_TO:

259 case HEAD_CC:

260 has_to_or_cc = TRUE;

261 /* fall through */

262 case HEAD_BCC:

263 if (flags & ACC_RCPT_FROM_HEAD) {

264 /* -t option (see comment above) */

265 DEBUG(5) debugf("hdr->value = %s\n",

266 hdr->value);

267 if (hdr->value) {

268 msg->rcpt_list = addr_list_append_rfc822(msg->rcpt_list, hdr->value, conf.host_name);

269 }

270 }

271 if (hdr->id == HEAD_BCC) {

272 DEBUG(3) debugf("removing 'Bcc' header\n");

273 msg->hdr_list = g_list_remove_link(msg->hdr_list, hdr_node);

274 g_list_free_1(hdr_node);

275 destroy_header(hdr);

276 }

277 break;

278 case HEAD_ENVELOPE_TO:

279 if (flags & ACC_SAVE_ENVELOPE_TO) {

280 DEBUG(3) debugf("creating 'X-Orig-Envelope-To' header\n");

281 msg->hdr_list = g_list_prepend(msg->hdr_list,

282 create_header(HEAD_UNKNOWN,

283 "X-Orig-Envelope-To: %s",

284 hdr->value));

285 }

286 DEBUG(3) debugf("removing 'Envelope-To' header\n");

287 msg->hdr_list = g_list_remove_link(msg->hdr_list,

288 hdr_node);

289 g_list_free_1(hdr_node);

290 destroy_header(hdr);

291 break;

292 case HEAD_RETURN_PATH:

293 if (flags & ACC_MAIL_FROM_HEAD) {

294 /* usually POP3 accept */

295 msg->return_path = create_address_qualified(hdr->value, TRUE, msg->received_host);

296 DEBUG(3) debugf("setting return_path to %s\n",

297 addr_string(msg->return_path));

298 }

299 DEBUG(3) debugf("removing 'Return-Path' header\n");

300 msg->hdr_list = g_list_remove_link(msg->hdr_list,

301 hdr_node);

302 g_list_free_1(hdr_node);

303 destroy_header(hdr);

304 break;

305 default:

306 break; /* make compiler happy */

307 }

308 }

309

310 /*

311 ** TODO: do we still need this as we don't fetch

312 ** mail anymore?

313 ** This can happen for pop3 accept only and if no

314 ** Return-Path: header was given

315 */

316 ensure_return_path(msg);

317

318 /* here we should have our recipients, fail if not: */

319 if (!msg->rcpt_list) {

320 logwrite(LOG_WARNING, "no recipients found in message\n");

321 return AERR_NORCPT;

322 }

323

324 if (!has_sender && !has_from) {

325 DEBUG(3) debugf("adding 'From:' header\n");

326 if (msg->full_sender_name) {

327 msg->hdr_list = g_list_append(msg->hdr_list,

328 create_header(HEAD_FROM,

329 "From: \"%s\" <%s@%s>\n",

330 msg->full_sender_name,

331 msg->return_path->local_part,

332 msg->return_path->domain));

333 } else {

334 msg->hdr_list = g_list_append(msg->hdr_list,

335 create_header(HEAD_FROM,

336 "From: <%s@%s>\n",

337 msg->return_path->local_part,

338 msg->return_path->domain));

339 }

340 }

341 if (!has_to_or_cc) {

342 DEBUG(3) debugf("no To: or Cc: header, hence adding "

343 "`To: undisclosed recipients:;'\n");

344 msg->hdr_list = g_list_append(msg->hdr_list,

345 create_header(HEAD_TO,

346 "To: undisclosed-recipients:;\n"));

347 }

348 if (!has_date) {

349 DEBUG(3) debugf("adding 'Date:' header\n");

350 msg->hdr_list = g_list_append(msg->hdr_list,

351 create_header(HEAD_DATE, "Date: %s\n",

352 rec_timestamp()));

353 }

354 if (!has_id) {

355 DEBUG(3) debugf("adding 'Message-ID:' header\n");

356 msg->hdr_list = g_list_append(msg->hdr_list,

357 create_header(HEAD_MESSAGE_ID,

358 "Message-ID: <%s@%s>\n",

359 msg->uid, conf.host_name));

360 }

361

362 return AERR_OK;

363 }

364

365 static void

366 add_received_hdr(message *msg)

367 {

368 gchar *for_string = NULL;

369 header *hdr = NULL;

370 address *addr;

371

372 DEBUG(3) debugf("adding 'Received:' header\n");

373 if (g_list_length(msg->rcpt_list) == 1) {

374 /* The `for' part only if exactly one rcpt is present */

375 addr = (address *) (g_list_first(msg->rcpt_list)->data);

376 for_string = g_strdup_printf("\n\tfor %s", addr_string(addr));

377 }

378 if (!msg->received_host) {

379 /* received locally */

380 hdr = create_header(HEAD_RECEIVED,

381 "Received: by %s (%s %s, from userid %d)\n"

382 "\tid %s%s; %s\n",

383 conf.host_name, PACKAGE, VERSION, geteuid(),

384 msg->uid,

385 for_string ? for_string : "", rec_timestamp());

386 } else {

387 /* received from remote */

388 DEBUG(5) debugf("adding 'Received:' header (5)\n");

389 hdr = create_header(HEAD_RECEIVED,

390 "Received: from %s\n"

391 "\tby %s with %s (%s %s)\n"

392 "\tid %s%s; %s\n",

393 msg->received_host, conf.host_name,

394 prot_names[msg->received_prot], PACKAGE,

395 VERSION, msg->uid,

396 for_string ? for_string : "", rec_timestamp());

397 }

398 msg->hdr_list = g_list_prepend(msg->hdr_list, hdr);

399 if (for_string) {

400 g_free(for_string);

401 }

402 }

403

404 accept_error

405 accept_message_prepare(message *msg, guint flags)

406 {

407 DEBUG(5) debugf("accept_message_prepare()\n");

408

409 /* generate unique message id */

410 msg->uid = g_malloc(14);

411 string_base62(msg->uid, time(NULL), 6);

412 msg->uid[6] = '-';

413 string_base62(msg->uid + 7, getpid(), 3);

414 msg->uid[10] = '-';

415 string_base62(msg->uid + 11, msg->transfer_id, 2);

416 msg->uid[13] = '\0';

417

418 /* if local, get password entry and set return path if missing */

419 if (!msg->received_host) {

420 struct passwd *passwd = NULL;

421

422 passwd = g_memdup(getpwuid(geteuid()), sizeof(struct passwd));

423 msg->ident = g_strdup(passwd->pw_name);

424 if (!msg->return_path) {

425 gchar *path = g_strdup_printf("<%s@%s>",

426 passwd->pw_name, conf.host_name);

427 DEBUG(3) debugf("setting return_path for local "

428 "accept: %s\n", path);

429 msg->return_path = create_address(path, TRUE);

430 g_free(path);

431 }

432 }

433

434 if (scan_headers(msg, flags) == AERR_NORCPT) {

435 return AERR_NORCPT;

436 }

437

438 /* after the hdrs are scanned because we need to know the rcpts */

439 add_received_hdr(msg);

440

441 return AERR_OK;

442 }

443

444 accept_error

445 accept_message(FILE *in, message *msg, guint flags)

446 {

447 accept_error err;

448

449 err = accept_message_stream(in, msg, flags);

450 if (err == AERR_OK) {

451 err = accept_message_prepare(msg, flags);

452 }

453

454 return err;

455 }