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1 /*
2 * git-imap-send - drops patches into an imap Drafts folder
3 * derived from isync/mbsync - mailbox synchronizer
4 *
5 * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
6 * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
7 * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
8 * Copyright (C) 2006 Mike McCormack
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, see <https://www.gnu.org/licenses/>.
22 */
23
24 #define USE_THE_REPOSITORY_VARIABLE
25 #define DISABLE_SIGN_COMPARE_WARNINGS
26
27 #include "git-compat-util.h"
28 #include "advice.h"
29 #include "config.h"
30 #include "credential.h"
31 #include "environment.h"
32 #include "gettext.h"
33 #include "run-command.h"
34 #include "parse-options.h"
35 #include "setup.h"
36 #include "strbuf.h"
37 #ifdef USE_CURL_FOR_IMAP_SEND
38 #include "http.h"
39 #endif
40
41 #if defined(USE_CURL_FOR_IMAP_SEND)
42 /* Always default to curl if it's available. */
43 #define USE_CURL_DEFAULT 1
44 #else
45 /* We don't have curl, so continue to use the historical implementation */
46 #define USE_CURL_DEFAULT 0
47 #endif
48
49 static int verbosity;
50 static int list_folders;
51 static int use_curl = USE_CURL_DEFAULT;
52 static char *opt_folder;
53
54 static char const * const imap_send_usage[] = {
55 N_("git imap-send [-v] [-q] [--[no-]curl] [(--folder|-f) <folder>] < <mbox>"),
56 "git imap-send --list",
57 NULL
58 };
59
60 static struct option imap_send_options[] = {
61 OPT__VERBOSITY(&verbosity),
62 OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
63 OPT_STRING('f', "folder", &opt_folder, "folder", "specify the IMAP folder"),
64 OPT_BOOL(0, "list", &list_folders, "list all folders on the IMAP server"),
65 OPT_END()
66 };
67
68 #undef DRV_OK
69 #define DRV_OK 0
70 #define DRV_MSG_BAD -1
71 #define DRV_BOX_BAD -2
72 #define DRV_STORE_BAD -3
73
74 __attribute__((format (printf, 1, 2)))
75 static void imap_info(const char *, ...);
76 __attribute__((format (printf, 1, 2)))
77 static void imap_warn(const char *, ...);
78
79 static char *next_arg(char **);
80
81 struct imap_server_conf {
82 char *tunnel;
83 char *host;
84 int port;
85 char *folder;
86 char *user;
87 char *pass;
88 int use_ssl;
89 int ssl_verify;
90 int use_html;
91 char *auth_method;
92 };
93
94 struct imap_socket {
95 int fd[2];
96 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
97 void *ssl;
98 #else
99 SSL *ssl;
100 #endif
101 };
102
103 struct imap_buffer {
104 struct imap_socket sock;
105 int bytes;
106 int offset;
107 char buf[1024];
108 };
109
110 struct imap_cmd;
111
112 struct imap {
113 int uidnext; /* from SELECT responses */
114 unsigned caps, rcaps; /* CAPABILITY results */
115 /* command queue */
116 int nexttag, num_in_progress, literal_pending;
117 struct imap_cmd *in_progress, **in_progress_append;
118 struct imap_buffer buf; /* this is BIG, so put it last */
119 };
120
121 struct imap_store {
122 const struct imap_server_conf *cfg;
123 /* currently open mailbox */
124 const char *name; /* foreign! maybe preset? */
125 int uidvalidity;
126 struct imap *imap;
127 const char *prefix;
128 };
129
130 struct imap_cmd_cb {
131 int (*cont)(struct imap_store *ctx, const char *prompt);
132 void *ctx;
133 char *data;
134 int dlen;
135 };
136
137 struct imap_cmd {
138 struct imap_cmd *next;
139 struct imap_cmd_cb cb;
140 char *cmd;
141 int tag;
142 };
143
144 #define CAP(cap) (imap->caps & (1 << (cap)))
145
146 enum CAPABILITY {
147 NOLOGIN = 0,
148 UIDPLUS,
149 LITERALPLUS,
150 NAMESPACE,
151 STARTTLS,
152 AUTH_PLAIN,
153 AUTH_CRAM_MD5,
154 AUTH_OAUTHBEARER,
155 AUTH_XOAUTH2,
156 };
157
158 static const char *cap_list[] = {
159 "LOGINDISABLED",
160 "UIDPLUS",
161 "LITERAL+",
162 "NAMESPACE",
163 "STARTTLS",
164 "AUTH=PLAIN",
165 "AUTH=CRAM-MD5",
166 "AUTH=OAUTHBEARER",
167 "AUTH=XOAUTH2",
168 };
169
170 #define RESP_OK 0
171 #define RESP_NO 1
172 #define RESP_BAD 2
173
174 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
175
176
177 #ifndef NO_OPENSSL
178 static void ssl_socket_perror(const char *func)
179 {
180 fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
181 }
182 #endif
183
184 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
185 {
186 #ifndef NO_OPENSSL
187 if (sock->ssl) {
188 int sslerr = SSL_get_error(sock->ssl, ret);
189 switch (sslerr) {
190 case SSL_ERROR_NONE:
191 break;
192 case SSL_ERROR_SYSCALL:
193 perror("SSL_connect");
194 break;
195 default:
196 ssl_socket_perror("SSL_connect");
197 break;
198 }
199 } else
200 #endif
201 {
202 if (ret < 0)
203 perror(func);
204 else
205 fprintf(stderr, "%s: unexpected EOF\n", func);
206 }
207 /* mark as used to appease -Wunused-parameter with NO_OPENSSL */
208 (void)sock;
209 }
210
211 #ifdef NO_OPENSSL
212 static int ssl_socket_connect(struct imap_socket *sock UNUSED,
213 const struct imap_server_conf *cfg UNUSED,
214 int use_tls_only UNUSED)
215 {
216 fprintf(stderr, "SSL requested, but SSL support is not compiled in\n");
217 return -1;
218 }
219
220 #else
221
222 static int host_matches(const char *host, const ASN1_STRING *asn1_str)
223 {
224 const char *pattern = (const char *)ASN1_STRING_get0_data(asn1_str);
225
226 /* embedded NUL characters may open a security hole */
227 if (memchr(pattern, '\0', ASN1_STRING_length(asn1_str)))
228 return 0;
229
230 if (pattern[0] == '*' && pattern[1] == '.') {
231 pattern += 2;
232 if (!(host = strchr(host, '.')))
233 return 0;
234 host++;
235 }
236
237 return *host && *pattern && !strcasecmp(host, pattern);
238 }
239
240 static int verify_hostname(X509 *cert, const char *hostname)
241 {
242 #if (OPENSSL_VERSION_NUMBER >= 0x40000000L)
243 const X509_NAME *subj;
244 #else
245 X509_NAME *subj;
246 #endif
247 const X509_NAME_ENTRY *cname_entry;
248 const ASN1_STRING *cname;
249 int i, found;
250 STACK_OF(GENERAL_NAME) *subj_alt_names;
251
252 /* try the DNS subjectAltNames */
253 found = 0;
254 if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
255 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
256 for (i = 0; !found && i < num_subj_alt_names; i++) {
257 int ntype;
258 GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
259 ASN1_STRING *subj_alt_str = GENERAL_NAME_get0_value(subj_alt_name, &ntype);
260
261 if (ntype == GEN_DNS && host_matches(hostname, subj_alt_str))
262 found = 1;
263 }
264 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
265 }
266 if (found)
267 return 0;
268
269 /* try the common name */
270 if (!(subj = X509_get_subject_name(cert)))
271 return error("cannot get certificate subject");
272 if ((i = X509_NAME_get_index_by_NID(subj, NID_commonName, -1)) < 0 ||
273 (cname_entry = X509_NAME_get_entry(subj, i)) == NULL ||
274 (cname = X509_NAME_ENTRY_get_data(cname_entry)) == NULL)
275 return error("cannot get certificate common name");
276 if (host_matches(hostname, cname))
277 return 0;
278 return error("certificate owner '%s' does not match hostname '%s'",
279 ASN1_STRING_get0_data(cname), hostname);
280 }
281
282 static int ssl_socket_connect(struct imap_socket *sock,
283 const struct imap_server_conf *cfg,
284 int use_tls_only)
285 {
286 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
287 const SSL_METHOD *meth;
288 #else
289 SSL_METHOD *meth;
290 #endif
291 SSL_CTX *ctx;
292 int ret;
293 X509 *cert;
294
295 SSL_library_init();
296 SSL_load_error_strings();
297
298 meth = SSLv23_method();
299 if (!meth) {
300 ssl_socket_perror("SSLv23_method");
301 return -1;
302 }
303
304 ctx = SSL_CTX_new(meth);
305 if (!ctx) {
306 ssl_socket_perror("SSL_CTX_new");
307 return -1;
308 }
309
310 if (use_tls_only)
311 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
312
313 if (cfg->ssl_verify)
314 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
315
316 if (!SSL_CTX_set_default_verify_paths(ctx)) {
317 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
318 return -1;
319 }
320 sock->ssl = SSL_new(ctx);
321 if (!sock->ssl) {
322 ssl_socket_perror("SSL_new");
323 return -1;
324 }
325 if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
326 ssl_socket_perror("SSL_set_rfd");
327 return -1;
328 }
329 if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
330 ssl_socket_perror("SSL_set_wfd");
331 return -1;
332 }
333
334 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
335 /*
336 * SNI (RFC4366)
337 * OpenSSL does not document this function, but the implementation
338 * returns 1 on success, 0 on failure after calling SSLerr().
339 */
340 ret = SSL_set_tlsext_host_name(sock->ssl, cfg->host);
341 if (ret != 1)
342 warning("SSL_set_tlsext_host_name(%s) failed.", cfg->host);
343 #endif
344
345 ret = SSL_connect(sock->ssl);
346 if (ret <= 0) {
347 socket_perror("SSL_connect", sock, ret);
348 return -1;
349 }
350
351 if (cfg->ssl_verify) {
352 /* make sure the hostname matches that of the certificate */
353 cert = SSL_get_peer_certificate(sock->ssl);
354 if (!cert)
355 return error("unable to get peer certificate.");
356 if (SSL_get_verify_result(sock->ssl) != X509_V_OK)
357 return error("unable to verify peer certificate");
358 if (verify_hostname(cert, cfg->host) < 0)
359 return -1;
360 }
361
362 return 0;
363 }
364 #endif
365
366 static int socket_read(struct imap_socket *sock, char *buf, int len)
367 {
368 ssize_t n;
369 #ifndef NO_OPENSSL
370 if (sock->ssl)
371 n = SSL_read(sock->ssl, buf, len);
372 else
373 #endif
374 n = xread(sock->fd[0], buf, len);
375 if (n <= 0) {
376 socket_perror("read", sock, n);
377 close(sock->fd[0]);
378 close(sock->fd[1]);
379 sock->fd[0] = sock->fd[1] = -1;
380 }
381 return n;
382 }
383
384 static int socket_write(struct imap_socket *sock, const char *buf, int len)
385 {
386 int n;
387 #ifndef NO_OPENSSL
388 if (sock->ssl)
389 n = SSL_write(sock->ssl, buf, len);
390 else
391 #endif
392 n = write_in_full(sock->fd[1], buf, len);
393 if (n != len) {
394 socket_perror("write", sock, n);
395 close(sock->fd[0]);
396 close(sock->fd[1]);
397 sock->fd[0] = sock->fd[1] = -1;
398 }
399 return n;
400 }
401
402 static void socket_shutdown(struct imap_socket *sock)
403 {
404 #ifndef NO_OPENSSL
405 if (sock->ssl) {
406 SSL_shutdown(sock->ssl);
407 SSL_free(sock->ssl);
408 }
409 #endif
410 close(sock->fd[0]);
411 close(sock->fd[1]);
412 }
413
414 /* simple line buffering */
415 static int buffer_gets(struct imap_buffer *b, char **s)
416 {
417 int n;
418 int start = b->offset;
419
420 *s = b->buf + start;
421
422 for (;;) {
423 /* make sure we have enough data to read the \r\n sequence */
424 if (b->offset + 1 >= b->bytes) {
425 if (start) {
426 /* shift down used bytes */
427 *s = b->buf;
428
429 assert(start <= b->bytes);
430 n = b->bytes - start;
431
432 if (n)
433 memmove(b->buf, b->buf + start, n);
434 b->offset -= start;
435 b->bytes = n;
436 start = 0;
437 }
438
439 n = socket_read(&b->sock, b->buf + b->bytes,
440 sizeof(b->buf) - b->bytes);
441
442 if (n <= 0)
443 return -1;
444
445 b->bytes += n;
446 }
447
448 if (b->buf[b->offset] == '\r') {
449 assert(b->offset + 1 < b->bytes);
450 if (b->buf[b->offset + 1] == '\n') {
451 b->buf[b->offset] = 0; /* terminate the string */
452 b->offset += 2; /* next line */
453 if ((0 < verbosity) || (list_folders && strstr(*s, "* LIST")))
454 puts(*s);
455 return 0;
456 }
457 }
458
459 b->offset++;
460 }
461 /* not reached */
462 }
463
464 __attribute__((format (printf, 1, 2)))
465 static void imap_info(const char *msg, ...)
466 {
467 va_list va;
468
469 if (0 <= verbosity) {
470 va_start(va, msg);
471 vprintf(msg, va);
472 va_end(va);
473 fflush(stdout);
474 }
475 }
476
477 __attribute__((format (printf, 1, 2)))
478 static void imap_warn(const char *msg, ...)
479 {
480 va_list va;
481
482 if (-2 < verbosity) {
483 va_start(va, msg);
484 vfprintf(stderr, msg, va);
485 va_end(va);
486 }
487 }
488
489 static char *next_arg(char **s)
490 {
491 char *ret;
492
493 if (!s || !*s)
494 return NULL;
495 while (isspace((unsigned char) **s))
496 (*s)++;
497 if (!**s) {
498 *s = NULL;
499 return NULL;
500 }
501 if (**s == '"') {
502 ++*s;
503 ret = *s;
504 *s = strchr(*s, '"');
505 } else {
506 ret = *s;
507 while (**s && !isspace((unsigned char) **s))
508 (*s)++;
509 }
510 if (*s) {
511 if (**s)
512 *(*s)++ = 0;
513 if (!**s)
514 *s = NULL;
515 }
516 return ret;
517 }
518
519 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
520 struct imap_cmd_cb *cb,
521 const char *fmt, va_list ap)
522 {
523 struct imap *imap = ctx->imap;
524 struct imap_cmd *cmd;
525 int n;
526 struct strbuf buf = STRBUF_INIT;
527
528 cmd = xmalloc(sizeof(struct imap_cmd));
529 cmd->cmd = xstrvfmt(fmt, ap);
530 cmd->tag = ++imap->nexttag;
531
532 if (cb)
533 cmd->cb = *cb;
534 else
535 memset(&cmd->cb, 0, sizeof(cmd->cb));
536
537 while (imap->literal_pending)
538 get_cmd_result(ctx, NULL);
539
540 if (!cmd->cb.data)
541 strbuf_addf(&buf, "%d %s\r\n", cmd->tag, cmd->cmd);
542 else
543 strbuf_addf(&buf, "%d %s{%d%s}\r\n", cmd->tag, cmd->cmd,
544 cmd->cb.dlen, CAP(LITERALPLUS) ? "+" : "");
545 if (buf.len > INT_MAX)
546 die("imap command overflow!");
547
548 if (0 < verbosity) {
549 if (imap->num_in_progress)
550 printf("(%d in progress) ", imap->num_in_progress);
551 if (!starts_with(cmd->cmd, "LOGIN"))
552 printf(">>> %s", buf.buf);
553 else
554 printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
555 }
556 if (socket_write(&imap->buf.sock, buf.buf, buf.len) != buf.len) {
557 free(cmd->cmd);
558 free(cmd);
559 if (cb)
560 free(cb->data);
561 strbuf_release(&buf);
562 return NULL;
563 }
564 strbuf_release(&buf);
565 if (cmd->cb.data) {
566 if (CAP(LITERALPLUS)) {
567 n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
568 free(cmd->cb.data);
569 if (n != cmd->cb.dlen ||
570 socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
571 free(cmd->cmd);
572 free(cmd);
573 return NULL;
574 }
575 cmd->cb.data = NULL;
576 } else
577 imap->literal_pending = 1;
578 } else if (cmd->cb.cont)
579 imap->literal_pending = 1;
580 cmd->next = NULL;
581 *imap->in_progress_append = cmd;
582 imap->in_progress_append = &cmd->next;
583 imap->num_in_progress++;
584 return cmd;
585 }
586
587 __attribute__((format (printf, 3, 4)))
588 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
589 const char *fmt, ...)
590 {
591 va_list ap;
592 struct imap_cmd *cmdp;
593
594 va_start(ap, fmt);
595 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
596 va_end(ap);
597 if (!cmdp)
598 return RESP_BAD;
599
600 return get_cmd_result(ctx, cmdp);
601 }
602
603 __attribute__((format (printf, 3, 4)))
604 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
605 const char *fmt, ...)
606 {
607 va_list ap;
608 struct imap_cmd *cmdp;
609
610 va_start(ap, fmt);
611 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
612 va_end(ap);
613 if (!cmdp)
614 return DRV_STORE_BAD;
615
616 switch (get_cmd_result(ctx, cmdp)) {
617 case RESP_BAD: return DRV_STORE_BAD;
618 case RESP_NO: return DRV_MSG_BAD;
619 default: return DRV_OK;
620 }
621 }
622
623 static int skip_imap_list_l(char **sp, int level)
624 {
625 char *s = *sp;
626
627 for (;;) {
628 while (isspace((unsigned char)*s))
629 s++;
630 if (level && *s == ')') {
631 s++;
632 break;
633 }
634 if (*s == '(') {
635 /* sublist */
636 s++;
637 if (skip_imap_list_l(&s, level + 1))
638 goto bail;
639 } else if (*s == '"') {
640 /* quoted string */
641 s++;
642 for (; *s != '"'; s++)
643 if (!*s)
644 goto bail;
645 s++;
646 } else {
647 /* atom */
648 for (; *s && !isspace((unsigned char)*s); s++)
649 if (level && *s == ')')
650 break;
651 }
652
653 if (!level)
654 break;
655 if (!*s)
656 goto bail;
657 }
658 *sp = s;
659 return 0;
660
661 bail:
662 return -1;
663 }
664
665 static void skip_list(char **sp)
666 {
667 skip_imap_list_l(sp, 0);
668 }
669
670 static void parse_capability(struct imap *imap, char *cmd)
671 {
672 char *arg;
673 unsigned i;
674
675 imap->caps = 0x80000000;
676 while ((arg = next_arg(&cmd)))
677 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
678 if (!strcmp(cap_list[i], arg))
679 imap->caps |= 1 << i;
680 imap->rcaps = imap->caps;
681 }
682
683 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
684 char *s)
685 {
686 struct imap *imap = ctx->imap;
687 char *arg, *p;
688
689 if (!s || *s != '[')
690 return RESP_OK; /* no response code */
691 s++;
692 if (!(p = strchr(s, ']'))) {
693 fprintf(stderr, "IMAP error: malformed response code\n");
694 return RESP_BAD;
695 }
696 *p++ = 0;
697 arg = next_arg(&s);
698 if (!arg) {
699 fprintf(stderr, "IMAP error: empty response code\n");
700 return RESP_BAD;
701 }
702 if (!strcmp("UIDVALIDITY", arg)) {
703 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &ctx->uidvalidity) || !ctx->uidvalidity) {
704 fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
705 return RESP_BAD;
706 }
707 } else if (!strcmp("UIDNEXT", arg)) {
708 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &imap->uidnext) || !imap->uidnext) {
709 fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
710 return RESP_BAD;
711 }
712 } else if (!strcmp("CAPABILITY", arg)) {
713 parse_capability(imap, s);
714 } else if (!strcmp("ALERT", arg)) {
715 /* RFC2060 says that these messages MUST be displayed
716 * to the user
717 */
718 for (; isspace((unsigned char)*p); p++);
719 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
720 } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
721 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &ctx->uidvalidity) || !ctx->uidvalidity ||
722 !(arg = next_arg(&s)) || strtol_i(arg, 10, (int *)cb->ctx) || !cb->ctx) {
723 fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
724 return RESP_BAD;
725 }
726 }
727 return RESP_OK;
728 }
729
730 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
731 {
732 struct imap *imap = ctx->imap;
733 struct imap_cmd *cmdp, **pcmdp;
734 char *cmd;
735 const char *arg, *arg1;
736 int n, resp, resp2, tag;
737
738 for (;;) {
739 if (buffer_gets(&imap->buf, &cmd))
740 return RESP_BAD;
741
742 arg = next_arg(&cmd);
743 if (!arg) {
744 fprintf(stderr, "IMAP error: empty response\n");
745 return RESP_BAD;
746 }
747 if (*arg == '*') {
748 arg = next_arg(&cmd);
749 if (!arg) {
750 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
751 return RESP_BAD;
752 }
753
754 if (!strcmp("NAMESPACE", arg)) {
755 /* rfc2342 NAMESPACE response. */
756 skip_list(&cmd); /* Personal mailboxes */
757 skip_list(&cmd); /* Others' mailboxes */
758 skip_list(&cmd); /* Shared mailboxes */
759 } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
760 !strcmp("NO", arg) || !strcmp("BYE", arg)) {
761 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
762 return resp;
763 } else if (!strcmp("CAPABILITY", arg)) {
764 parse_capability(imap, cmd);
765 } else if ((arg1 = next_arg(&cmd))) {
766 ; /*
767 * Unhandled response-data with at least two words.
768 * Ignore it.
769 *
770 * NEEDSWORK: Previously this case handled '<num> EXISTS'
771 * and '<num> RECENT' but as a probably-unintended side
772 * effect it ignores other unrecognized two-word
773 * responses. imap-send doesn't ever try to read
774 * messages or mailboxes these days, so consider
775 * eliminating this case.
776 */
777 } else {
778 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
779 return RESP_BAD;
780 }
781 } else if (!imap->in_progress) {
782 fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
783 return RESP_BAD;
784 } else if (*arg == '+') {
785 /* This can happen only with the last command underway, as
786 it enforces a round-trip. */
787 cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
788 offsetof(struct imap_cmd, next));
789 if (cmdp->cb.data) {
790 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
791 FREE_AND_NULL(cmdp->cb.data);
792 if (n != (int)cmdp->cb.dlen)
793 return RESP_BAD;
794 } else if (cmdp->cb.cont) {
795 if (cmdp->cb.cont(ctx, cmd))
796 return RESP_BAD;
797 } else {
798 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
799 return RESP_BAD;
800 }
801 if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
802 return RESP_BAD;
803 if (!cmdp->cb.cont)
804 imap->literal_pending = 0;
805 if (!tcmd)
806 return DRV_OK;
807 } else {
808 if (strtol_i(arg, 10, &tag)) {
809 fprintf(stderr, "IMAP error: malformed tag %s\n", arg);
810 return RESP_BAD;
811 }
812 for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
813 if (cmdp->tag == tag)
814 goto gottag;
815 fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
816 return RESP_BAD;
817 gottag:
818 if (!(*pcmdp = cmdp->next))
819 imap->in_progress_append = pcmdp;
820 imap->num_in_progress--;
821 if (cmdp->cb.cont || cmdp->cb.data)
822 imap->literal_pending = 0;
823 arg = next_arg(&cmd);
824 if (!arg)
825 arg = "";
826 if (!strcmp("OK", arg))
827 resp = DRV_OK;
828 else {
829 if (!strcmp("NO", arg))
830 resp = RESP_NO;
831 else /*if (!strcmp("BAD", arg))*/
832 resp = RESP_BAD;
833 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
834 !starts_with(cmdp->cmd, "LOGIN") ?
835 cmdp->cmd : "LOGIN <user> <pass>",
836 arg, cmd ? cmd : "");
837 }
838 if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
839 resp = resp2;
840 free(cmdp->cb.data);
841 free(cmdp->cmd);
842 free(cmdp);
843 if (!tcmd || tcmd == cmdp)
844 return resp;
845 }
846 }
847 /* not reached */
848 }
849
850 static void imap_close_server(struct imap_store *ictx)
851 {
852 struct imap *imap = ictx->imap;
853
854 if (imap->buf.sock.fd[0] != -1) {
855 imap_exec(ictx, NULL, "LOGOUT");
856 socket_shutdown(&imap->buf.sock);
857 }
858 free(imap);
859 }
860
861 static void imap_close_store(struct imap_store *ctx)
862 {
863 imap_close_server(ctx);
864 free(ctx);
865 }
866
867 #ifndef NO_OPENSSL
868
869 /*
870 * hexchar() and cram() functions are based on the code from the isync
871 * project (https://isync.sourceforge.io/).
872 */
873 static char hexchar(unsigned int b)
874 {
875 return b < 10 ? '0' + b : 'a' + (b - 10);
876 }
877
878 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
879 static char *plain_base64(const char *user, const char *pass)
880 {
881 struct strbuf raw = STRBUF_INIT;
882 int b64_len;
883 char *b64;
884
885 /*
886 * Compose the PLAIN string
887 *
888 * The username and password are combined to one string and base64 encoded.
889 * "\0user\0pass"
890 *
891 * The method has been described in RFC4616.
892 *
893 * https://datatracker.ietf.org/doc/html/rfc4616
894 */
895 strbuf_addch(&raw, '\0');
896 strbuf_addstr(&raw, user);
897 strbuf_addch(&raw, '\0');
898 strbuf_addstr(&raw, pass);
899
900 b64 = xmallocz(ENCODED_SIZE(raw.len));
901 b64_len = EVP_EncodeBlock((unsigned char *)b64, (unsigned char *)raw.buf, raw.len);
902 strbuf_release(&raw);
903
904 if (b64_len < 0) {
905 free(b64);
906 return NULL;
907 }
908 return b64;
909 }
910
911 static char *cram(const char *challenge_64, const char *user, const char *pass)
912 {
913 int i, resp_len, encoded_len, decoded_len;
914 unsigned char hash[16];
915 char hex[33];
916 char *response, *response_64, *challenge;
917
918 /*
919 * length of challenge_64 (i.e. base-64 encoded string) is a good
920 * enough upper bound for challenge (decoded result).
921 */
922 encoded_len = strlen(challenge_64);
923 challenge = xmalloc(encoded_len);
924 decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
925 (unsigned char *)challenge_64, encoded_len);
926 if (decoded_len < 0)
927 die("invalid challenge %s", challenge_64);
928 if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
929 die("HMAC error");
930
931 hex[32] = 0;
932 for (i = 0; i < 16; i++) {
933 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
934 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
935 }
936
937 /* response: "<user> <digest in hex>" */
938 response = xstrfmt("%s %s", user, hex);
939 resp_len = strlen(response);
940
941 response_64 = xmallocz(ENCODED_SIZE(resp_len));
942 encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
943 (unsigned char *)response, resp_len);
944 if (encoded_len < 0)
945 die("EVP_EncodeBlock error");
946 return (char *)response_64;
947 }
948
949 static char *oauthbearer_base64(const char *user, const char *access_token)
950 {
951 int b64_len;
952 char *raw, *b64;
953
954 /*
955 * Compose the OAUTHBEARER string
956 *
957 * "n,a=" {User} ",^Ahost=" {Host} "^Aport=" {Port} "^Aauth=Bearer " {Access Token} "^A^A
958 *
959 * The first part `n,a=" {User} ",` is the gs2 header described in RFC5801.
960 * * gs2-cb-flag `n` -> client does not support CB
961 * * gs2-authzid `a=" {User} "`
962 *
963 * The second part are key value pairs containing host, port and auth as
964 * described in RFC7628.
965 *
966 * https://datatracker.ietf.org/doc/html/rfc5801
967 * https://datatracker.ietf.org/doc/html/rfc7628
968 */
969 raw = xstrfmt("n,a=%s,\001auth=Bearer %s\001\001", user, access_token);
970
971 /* Base64 encode */
972 b64 = xmallocz(ENCODED_SIZE(strlen(raw)));
973 b64_len = EVP_EncodeBlock((unsigned char *)b64, (unsigned char *)raw, strlen(raw));
974 free(raw);
975
976 if (b64_len < 0) {
977 free(b64);
978 return NULL;
979 }
980 return b64;
981 }
982
983 static char *xoauth2_base64(const char *user, const char *access_token)
984 {
985 int b64_len;
986 char *raw, *b64;
987
988 /*
989 * Compose the XOAUTH2 string
990 * "user=" {User} "^Aauth=Bearer " {Access Token} "^A^A"
991 * https://developers.google.com/workspace/gmail/imap/xoauth2-protocol#initial_client_response
992 */
993 raw = xstrfmt("user=%s\001auth=Bearer %s\001\001", user, access_token);
994
995 /* Base64 encode */
996 b64 = xmallocz(ENCODED_SIZE(strlen(raw)));
997 b64_len = EVP_EncodeBlock((unsigned char *)b64, (unsigned char *)raw, strlen(raw));
998 free(raw);
999
1000 if (b64_len < 0) {
1001 free(b64);
1002 return NULL;
1003 }
1004 return b64;
1005 }
1006
1007 static int auth_plain(struct imap_store *ctx, const char *prompt UNUSED)
1008 {
1009 int ret;
1010 char *b64;
1011
1012 b64 = plain_base64(ctx->cfg->user, ctx->cfg->pass);
1013 if (!b64)
1014 return error("PLAIN: base64 encoding failed");
1015
1016 /* Send the base64-encoded response */
1017 ret = socket_write(&ctx->imap->buf.sock, b64, strlen(b64));
1018 if (ret != (int)strlen(b64)) {
1019 free(b64);
1020 return error("IMAP error: sending PLAIN response failed");
1021 }
1022
1023 free(b64);
1024 return 0;
1025 }
1026
1027 static int auth_cram_md5(struct imap_store *ctx, const char *prompt)
1028 {
1029 int ret;
1030 char *response;
1031
1032 response = cram(prompt, ctx->cfg->user, ctx->cfg->pass);
1033
1034 ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
1035 if (ret != strlen(response)) {
1036 free(response);
1037 return error("IMAP error: sending CRAM-MD5 response failed");
1038 }
1039
1040 free(response);
1041
1042 return 0;
1043 }
1044
1045 static int auth_oauthbearer(struct imap_store *ctx, const char *prompt UNUSED)
1046 {
1047 int ret;
1048 char *b64;
1049
1050 b64 = oauthbearer_base64(ctx->cfg->user, ctx->cfg->pass);
1051 if (!b64)
1052 return error("OAUTHBEARER: base64 encoding failed");
1053
1054 /* Send the base64-encoded response */
1055 ret = socket_write(&ctx->imap->buf.sock, b64, strlen(b64));
1056 if (ret != (int)strlen(b64)) {
1057 free(b64);
1058 return error("IMAP error: sending OAUTHBEARER response failed");
1059 }
1060
1061 free(b64);
1062 return 0;
1063 }
1064
1065 static int auth_xoauth2(struct imap_store *ctx, const char *prompt UNUSED)
1066 {
1067 int ret;
1068 char *b64;
1069
1070 b64 = xoauth2_base64(ctx->cfg->user, ctx->cfg->pass);
1071 if (!b64)
1072 return error("XOAUTH2: base64 encoding failed");
1073
1074 /* Send the base64-encoded response */
1075 ret = socket_write(&ctx->imap->buf.sock, b64, strlen(b64));
1076 if (ret != (int)strlen(b64)) {
1077 free(b64);
1078 return error("IMAP error: sending XOAUTH2 response failed");
1079 }
1080
1081 free(b64);
1082 return 0;
1083 }
1084
1085 #else
1086
1087 #define auth_plain NULL
1088 #define auth_cram_md5 NULL
1089 #define auth_oauthbearer NULL
1090 #define auth_xoauth2 NULL
1091
1092 #endif
1093
1094 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
1095 {
1096 if (srvc->user && srvc->pass)
1097 return;
1098
1099 cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1100 cred->host = xstrfmt("%s:%d", srvc->host, srvc->port);
1101
1102 cred->username = xstrdup_or_null(srvc->user);
1103 cred->password = xstrdup_or_null(srvc->pass);
1104
1105 credential_fill(the_repository, cred, 1);
1106
1107 if (!srvc->user)
1108 srvc->user = xstrdup(cred->username);
1109 if (!srvc->pass)
1110 srvc->pass = xstrdup(cred->password);
1111 }
1112
1113 static int try_auth_method(struct imap_server_conf *srvc,
1114 struct imap_store *ctx,
1115 struct imap *imap,
1116 const char *auth_method,
1117 enum CAPABILITY cap,
1118 int (*fn)(struct imap_store *, const char *))
1119 {
1120 struct imap_cmd_cb cb = {0};
1121
1122 if (!CAP(cap)) {
1123 fprintf(stderr, "You specified "
1124 "%s as authentication method, "
1125 "but %s doesn't support it.\n",
1126 auth_method, srvc->host);
1127 return -1;
1128 }
1129 cb.cont = fn;
1130
1131 if (NOT_CONSTANT(!cb.cont)) {
1132 fprintf(stderr, "If you want to use %s authentication mechanism, "
1133 "you have to build git-imap-send with OpenSSL library.",
1134 auth_method);
1135 return -1;
1136 }
1137 if (imap_exec(ctx, &cb, "AUTHENTICATE %s", auth_method) != RESP_OK) {
1138 fprintf(stderr, "IMAP error: AUTHENTICATE %s failed\n",
1139 auth_method);
1140 return -1;
1141 }
1142 return 0;
1143 }
1144
1145 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
1146 {
1147 struct credential cred = CREDENTIAL_INIT;
1148 struct imap_store *ctx;
1149 struct imap *imap;
1150 char *arg, *rsp;
1151 int s = -1, preauth;
1152
1153 CALLOC_ARRAY(ctx, 1);
1154
1155 ctx->cfg = srvc;
1156 ctx->imap = CALLOC_ARRAY(imap, 1);
1157 imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
1158 imap->in_progress_append = &imap->in_progress;
1159
1160 /* open connection to IMAP server */
1161
1162 if (srvc->tunnel) {
1163 struct child_process tunnel = CHILD_PROCESS_INIT;
1164
1165 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
1166
1167 strvec_push(&tunnel.args, srvc->tunnel);
1168 tunnel.use_shell = 1;
1169 tunnel.in = -1;
1170 tunnel.out = -1;
1171 if (start_command(&tunnel))
1172 die("cannot start proxy %s", srvc->tunnel);
1173
1174 imap->buf.sock.fd[0] = tunnel.out;
1175 imap->buf.sock.fd[1] = tunnel.in;
1176
1177 imap_info("OK\n");
1178 } else {
1179 #ifndef NO_IPV6
1180 struct addrinfo hints, *ai0, *ai;
1181 int gai;
1182 char portstr[6];
1183
1184 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
1185
1186 memset(&hints, 0, sizeof(hints));
1187 hints.ai_socktype = SOCK_STREAM;
1188 hints.ai_protocol = IPPROTO_TCP;
1189
1190 imap_info("Resolving %s... ", srvc->host);
1191 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
1192 if (gai) {
1193 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
1194 goto bail;
1195 }
1196 imap_info("OK\n");
1197
1198 for (ai0 = ai; ai; ai = ai->ai_next) {
1199 char addr[NI_MAXHOST];
1200
1201 s = socket(ai->ai_family, ai->ai_socktype,
1202 ai->ai_protocol);
1203 if (s < 0)
1204 continue;
1205
1206 getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1207 sizeof(addr), NULL, 0, NI_NUMERICHOST);
1208 imap_info("Connecting to [%s]:%s... ", addr, portstr);
1209
1210 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1211 close(s);
1212 s = -1;
1213 perror("connect");
1214 continue;
1215 }
1216
1217 break;
1218 }
1219 freeaddrinfo(ai0);
1220 #else /* NO_IPV6 */
1221 struct hostent *he;
1222 struct sockaddr_in addr;
1223
1224 memset(&addr, 0, sizeof(addr));
1225 addr.sin_port = htons(srvc->port);
1226 addr.sin_family = AF_INET;
1227
1228 imap_info("Resolving %s... ", srvc->host);
1229 he = gethostbyname(srvc->host);
1230 if (!he) {
1231 perror("gethostbyname");
1232 goto bail;
1233 }
1234 imap_info("OK\n");
1235
1236 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1237
1238 s = socket(PF_INET, SOCK_STREAM, 0);
1239
1240 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1241 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1242 close(s);
1243 s = -1;
1244 perror("connect");
1245 }
1246 #endif
1247 if (s < 0) {
1248 fputs("error: unable to connect to server\n", stderr);
1249 goto bail;
1250 }
1251
1252 imap->buf.sock.fd[0] = s;
1253 imap->buf.sock.fd[1] = dup(s);
1254
1255 if (srvc->use_ssl &&
1256 ssl_socket_connect(&imap->buf.sock, srvc, 0)) {
1257 close(s);
1258 goto bail;
1259 }
1260 imap_info("OK\n");
1261 }
1262
1263 /* read the greeting string */
1264 if (buffer_gets(&imap->buf, &rsp)) {
1265 fprintf(stderr, "IMAP error: no greeting response\n");
1266 goto bail;
1267 }
1268 arg = next_arg(&rsp);
1269 if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1270 fprintf(stderr, "IMAP error: invalid greeting response\n");
1271 goto bail;
1272 }
1273 preauth = 0;
1274 if (!strcmp("PREAUTH", arg))
1275 preauth = 1;
1276 else if (strcmp("OK", arg) != 0) {
1277 fprintf(stderr, "IMAP error: unknown greeting response\n");
1278 goto bail;
1279 }
1280 parse_response_code(ctx, NULL, rsp);
1281 if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1282 goto bail;
1283
1284 if (!preauth) {
1285 #ifndef NO_OPENSSL
1286 if (!srvc->use_ssl && CAP(STARTTLS)) {
1287 if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1288 goto bail;
1289 if (ssl_socket_connect(&imap->buf.sock, srvc, 1))
1290 goto bail;
1291 /* capabilities may have changed, so get the new capabilities */
1292 if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1293 goto bail;
1294 }
1295 #endif
1296 imap_info("Logging in...\n");
1297 server_fill_credential(srvc, &cred);
1298
1299 if (srvc->auth_method) {
1300 if (!strcmp(srvc->auth_method, "PLAIN")) {
1301 if (try_auth_method(srvc, ctx, imap, "PLAIN", AUTH_PLAIN, auth_plain))
1302 goto bail;
1303 } else if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1304 if (try_auth_method(srvc, ctx, imap, "CRAM-MD5", AUTH_CRAM_MD5, auth_cram_md5))
1305 goto bail;
1306 } else if (!strcmp(srvc->auth_method, "OAUTHBEARER")) {
1307 if (try_auth_method(srvc, ctx, imap, "OAUTHBEARER", AUTH_OAUTHBEARER, auth_oauthbearer))
1308 goto bail;
1309 } else if (!strcmp(srvc->auth_method, "XOAUTH2")) {
1310 if (try_auth_method(srvc, ctx, imap, "XOAUTH2", AUTH_XOAUTH2, auth_xoauth2))
1311 goto bail;
1312 } else {
1313 fprintf(stderr, "unknown authentication mechanism: %s\n", srvc->auth_method);
1314 goto bail;
1315 }
1316 } else {
1317 if (CAP(NOLOGIN)) {
1318 fprintf(stderr, "skipping account %s@%s, server forbids LOGIN\n",
1319 srvc->user, srvc->host);
1320 goto bail;
1321 }
1322 if (!imap->buf.sock.ssl)
1323 imap_warn("*** IMAP Warning *** Password is being "
1324 "sent in the clear\n");
1325 if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1326 fprintf(stderr, "IMAP error: LOGIN failed\n");
1327 goto bail;
1328 }
1329 }
1330 } /* !preauth */
1331
1332 if (cred.username)
1333 credential_approve(the_repository, &cred);
1334 credential_clear(&cred);
1335
1336 /* check the target mailbox exists */
1337 ctx->name = folder;
1338 switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1339 case RESP_OK:
1340 /* ok */
1341 break;
1342 case RESP_BAD:
1343 fprintf(stderr, "IMAP error: could not check mailbox\n");
1344 goto out;
1345 case RESP_NO:
1346 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1347 imap_info("Created missing mailbox\n");
1348 } else {
1349 fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1350 goto out;
1351 }
1352 break;
1353 }
1354
1355 ctx->prefix = "";
1356 return ctx;
1357
1358 bail:
1359 if (cred.username)
1360 credential_reject(the_repository, &cred);
1361 credential_clear(&cred);
1362
1363 out:
1364 imap_close_store(ctx);
1365 return NULL;
1366 }
1367
1368 /*
1369 * Insert CR characters as necessary in *msg to ensure that every LF
1370 * character in *msg is preceded by a CR.
1371 */
1372 static void lf_to_crlf(struct strbuf *msg)
1373 {
1374 char *new_msg;
1375 size_t i, j;
1376 char lastc;
1377
1378 /* First pass: tally, in j, the size of the new_msg string: */
1379 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1380 if (msg->buf[i] == '\n' && lastc != '\r')
1381 j++; /* a CR will need to be added here */
1382 lastc = msg->buf[i];
1383 j++;
1384 }
1385
1386 new_msg = xmallocz(j);
1387
1388 /*
1389 * Second pass: write the new_msg string. Note that this loop is
1390 * otherwise identical to the first pass.
1391 */
1392 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1393 if (msg->buf[i] == '\n' && lastc != '\r')
1394 new_msg[j++] = '\r';
1395 lastc = new_msg[j++] = msg->buf[i];
1396 }
1397 strbuf_attach(msg, new_msg, j, j + 1);
1398 }
1399
1400 /*
1401 * Store msg to IMAP. Also detach and free the data from msg->data,
1402 * leaving msg->data empty.
1403 */
1404 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1405 {
1406 struct imap *imap = ctx->imap;
1407 struct imap_cmd_cb cb;
1408 const char *prefix, *box;
1409 int ret;
1410
1411 lf_to_crlf(msg);
1412 memset(&cb, 0, sizeof(cb));
1413
1414 cb.dlen = msg->len;
1415 cb.data = strbuf_detach(msg, NULL);
1416
1417 box = ctx->name;
1418 prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1419 ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1420 imap->caps = imap->rcaps;
1421 if (ret != DRV_OK)
1422 return ret;
1423
1424 return DRV_OK;
1425 }
1426
1427 static void wrap_in_html(struct strbuf *msg)
1428 {
1429 struct strbuf buf = STRBUF_INIT;
1430 static const char *content_type = "Content-Type: text/html;\n";
1431 static const char *pre_open = "<pre>\n";
1432 static const char *pre_close = "</pre>\n";
1433 const char *body = strstr(msg->buf, "\n\n");
1434
1435 if (!body)
1436 return; /* Headers but no body; no wrapping needed */
1437
1438 body += 2;
1439
1440 strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1441 strbuf_addstr(&buf, content_type);
1442 strbuf_addch(&buf, '\n');
1443 strbuf_addstr(&buf, pre_open);
1444 strbuf_addstr_xml_quoted(&buf, body);
1445 strbuf_addstr(&buf, pre_close);
1446
1447 strbuf_release(msg);
1448 *msg = buf;
1449 }
1450
1451 static int count_messages(struct strbuf *all_msgs)
1452 {
1453 int count = 0;
1454 char *p = all_msgs->buf;
1455
1456 while (1) {
1457 if (starts_with(p, "From ")) {
1458 if (starts_with(p, "From git-send-email")) {
1459 p = strstr(p+5, "\nFrom: ");
1460 if (!p) break;
1461 p += 7;
1462 p = strstr(p, "\nTo: ");
1463 if (!p) break;
1464 p += 5;
1465 count++;
1466 } else {
1467 p = strstr(p+5, "\nFrom: ");
1468 if (!p) break;
1469 p = strstr(p+7, "\nDate: ");
1470 if (!p) break;
1471 p = strstr(p+7, "\nSubject: ");
1472 if (!p) break;
1473 p += 10;
1474 count++;
1475 }
1476 }
1477 p = strstr(p+5, "\nFrom ");
1478 if (!p)
1479 break;
1480 p++;
1481 }
1482 return count;
1483 }
1484
1485 /*
1486 * Copy the next message from all_msgs, starting at offset *ofs, to
1487 * msg. Update *ofs to the start of the following message. Return
1488 * true iff a message was successfully copied.
1489 */
1490 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1491 {
1492 char *p, *data;
1493 size_t len;
1494
1495 if (*ofs >= all_msgs->len)
1496 return 0;
1497
1498 data = &all_msgs->buf[*ofs];
1499 len = all_msgs->len - *ofs;
1500
1501 if (len < 5 || !starts_with(data, "From "))
1502 return 0;
1503
1504 p = strchr(data, '\n');
1505 if (p) {
1506 p++;
1507 len -= p - data;
1508 *ofs += p - data;
1509 data = p;
1510 }
1511
1512 p = strstr(data, "\nFrom ");
1513 if (p)
1514 len = &p[1] - data;
1515
1516 strbuf_add(msg, data, len);
1517 *ofs += len;
1518 return 1;
1519 }
1520
1521 static int git_imap_config(const char *var, const char *val,
1522 const struct config_context *ctx, void *cb)
1523 {
1524 struct imap_server_conf *cfg = cb;
1525
1526 if (!strcmp("imap.sslverify", var)) {
1527 cfg->ssl_verify = git_config_bool(var, val);
1528 } else if (!strcmp("imap.preformattedhtml", var)) {
1529 cfg->use_html = git_config_bool(var, val);
1530 } else if (!strcmp("imap.folder", var)) {
1531 FREE_AND_NULL(cfg->folder);
1532 return git_config_string(&cfg->folder, var, val);
1533 } else if (!strcmp("imap.user", var)) {
1534 FREE_AND_NULL(cfg->user);
1535 return git_config_string(&cfg->user, var, val);
1536 } else if (!strcmp("imap.pass", var)) {
1537 FREE_AND_NULL(cfg->pass);
1538 return git_config_string(&cfg->pass, var, val);
1539 } else if (!strcmp("imap.tunnel", var)) {
1540 FREE_AND_NULL(cfg->tunnel);
1541 return git_config_string(&cfg->tunnel, var, val);
1542 } else if (!strcmp("imap.authmethod", var)) {
1543 FREE_AND_NULL(cfg->auth_method);
1544 return git_config_string(&cfg->auth_method, var, val);
1545 } else if (!strcmp("imap.port", var)) {
1546 cfg->port = git_config_int(var, val, ctx->kvi);
1547 } else if (!strcmp("imap.host", var)) {
1548 if (!val) {
1549 return config_error_nonbool(var);
1550 } else {
1551 if (starts_with(val, "imap:"))
1552 val += 5;
1553 else if (starts_with(val, "imaps:")) {
1554 val += 6;
1555 cfg->use_ssl = 1;
1556 }
1557 if (starts_with(val, "//"))
1558 val += 2;
1559 cfg->host = xstrdup(val);
1560 }
1561 } else {
1562 return git_default_config(var, val, ctx, cb);
1563 }
1564
1565 return 0;
1566 }
1567
1568 static int append_msgs_to_imap(struct imap_server_conf *server,
1569 struct strbuf* all_msgs, int total)
1570 {
1571 struct strbuf msg = STRBUF_INIT;
1572 struct imap_store *ctx = NULL;
1573 int ofs = 0;
1574 int r;
1575 int n = 0;
1576
1577 ctx = imap_open_store(server, server->folder);
1578 if (!ctx) {
1579 fprintf(stderr, "failed to open store\n");
1580 return 1;
1581 }
1582 ctx->name = server->folder;
1583
1584 fprintf(stderr, "Sending %d message%s to %s folder...\n",
1585 total, (total != 1) ? "s" : "", server->folder);
1586 while (1) {
1587 unsigned percent = n * 100 / total;
1588
1589 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1590
1591 if (!split_msg(all_msgs, &msg, &ofs))
1592 break;
1593 if (server->use_html)
1594 wrap_in_html(&msg);
1595 r = imap_store_msg(ctx, &msg);
1596 if (r != DRV_OK)
1597 break;
1598 n++;
1599 }
1600 fprintf(stderr, "\n");
1601
1602 imap_close_store(ctx);
1603
1604 return 0;
1605 }
1606
1607 static int list_imap_folders(struct imap_server_conf *server)
1608 {
1609 struct imap_store *ctx = imap_open_store(server, "INBOX");
1610 if (!ctx) {
1611 fprintf(stderr, "failed to connect to IMAP server\n");
1612 return 1;
1613 }
1614
1615 fprintf(stderr, "Fetching the list of available folders...\n");
1616 /* Issue the LIST command and print the results */
1617 if (imap_exec(ctx, NULL, "LIST \"\" \"*\"") != RESP_OK) {
1618 fprintf(stderr, "failed to list folders\n");
1619 imap_close_store(ctx);
1620 return 1;
1621 }
1622
1623 imap_close_store(ctx);
1624 return 0;
1625 }
1626
1627 #ifdef USE_CURL_FOR_IMAP_SEND
1628 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1629 {
1630 CURL *curl;
1631 struct strbuf path = STRBUF_INIT;
1632 char *uri_encoded_folder;
1633
1634 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1635 die("curl_global_init failed");
1636
1637 curl = curl_easy_init();
1638
1639 if (!curl)
1640 die("curl_easy_init failed");
1641
1642 server_fill_credential(srvc, cred);
1643 curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
1644
1645 /*
1646 * Use CURLOPT_PASSWORD irrespective of whether there is
1647 * an auth method specified or not, unless it's OAuth2.0,
1648 * where we use CURLOPT_XOAUTH2_BEARER.
1649 */
1650 if (!srvc->auth_method ||
1651 (strcmp(srvc->auth_method, "XOAUTH2") &&
1652 strcmp(srvc->auth_method, "OAUTHBEARER")))
1653 curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
1654
1655 strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
1656 strbuf_addstr(&path, srvc->host);
1657 if (!path.len || path.buf[path.len - 1] != '/')
1658 strbuf_addch(&path, '/');
1659
1660 if (!list_folders) {
1661 uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
1662 if (!uri_encoded_folder)
1663 die("failed to encode server folder");
1664 strbuf_addstr(&path, uri_encoded_folder);
1665 curl_free(uri_encoded_folder);
1666 }
1667
1668 curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1669 strbuf_release(&path);
1670 curl_easy_setopt(curl, CURLOPT_PORT, (long)srvc->port);
1671
1672 if (srvc->auth_method) {
1673 if (!strcmp(srvc->auth_method, "XOAUTH2") ||
1674 !strcmp(srvc->auth_method, "OAUTHBEARER")) {
1675
1676 /*
1677 * While CURLOPT_XOAUTH2_BEARER looks as if it only supports XOAUTH2,
1678 * upon debugging, it has been found that it is capable of detecting
1679 * the best option out of OAUTHBEARER and XOAUTH2.
1680 */
1681 curl_easy_setopt(curl, CURLOPT_XOAUTH2_BEARER, srvc->pass);
1682 } else {
1683 struct strbuf auth = STRBUF_INIT;
1684 strbuf_addstr(&auth, "AUTH=");
1685 strbuf_addstr(&auth, srvc->auth_method);
1686 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1687 strbuf_release(&auth);
1688 }
1689 }
1690
1691 if (!srvc->use_ssl)
1692 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1693
1694 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, (long)srvc->ssl_verify);
1695 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, (long)srvc->ssl_verify);
1696
1697 if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1698 http_trace_curl_no_data();
1699 setup_curl_trace(curl);
1700
1701 return curl;
1702 }
1703
1704 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1705 struct strbuf* all_msgs, int total)
1706 {
1707 int ofs = 0;
1708 int n = 0;
1709 struct buffer msgbuf = { STRBUF_INIT, 0 };
1710 CURL *curl;
1711 CURLcode res = CURLE_OK;
1712 struct credential cred = CREDENTIAL_INIT;
1713
1714 curl = setup_curl(server, &cred);
1715
1716 curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1717 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1718
1719 curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1720
1721 fprintf(stderr, "Sending %d message%s to %s folder...\n",
1722 total, (total != 1) ? "s" : "", server->folder);
1723 while (1) {
1724 unsigned percent = n * 100 / total;
1725 int prev_len;
1726
1727 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1728
1729 prev_len = msgbuf.buf.len;
1730 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1731 break;
1732 if (server->use_html)
1733 wrap_in_html(&msgbuf.buf);
1734 lf_to_crlf(&msgbuf.buf);
1735
1736 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1737 cast_size_t_to_curl_off_t(msgbuf.buf.len-prev_len));
1738
1739 res = curl_easy_perform(curl);
1740
1741 if(res != CURLE_OK) {
1742 fprintf(stderr, "curl_easy_perform() failed: %s\n",
1743 curl_easy_strerror(res));
1744 break;
1745 }
1746
1747 n++;
1748 }
1749 fprintf(stderr, "\n");
1750
1751 curl_easy_cleanup(curl);
1752 curl_global_cleanup();
1753
1754 if (cred.username) {
1755 if (res == CURLE_OK)
1756 credential_approve(the_repository, &cred);
1757 else if (res == CURLE_LOGIN_DENIED)
1758 credential_reject(the_repository, &cred);
1759 }
1760
1761 credential_clear(&cred);
1762
1763 return res != CURLE_OK;
1764 }
1765
1766 static int curl_list_imap_folders(struct imap_server_conf *server)
1767 {
1768 CURL *curl;
1769 CURLcode res = CURLE_OK;
1770 struct credential cred = CREDENTIAL_INIT;
1771
1772 fprintf(stderr, "Fetching the list of available folders...\n");
1773 curl = setup_curl(server, &cred);
1774 res = curl_easy_perform(curl);
1775
1776 curl_easy_cleanup(curl);
1777 curl_global_cleanup();
1778
1779 if (cred.username) {
1780 if (res == CURLE_OK)
1781 credential_approve(the_repository, &cred);
1782 else if (res == CURLE_LOGIN_DENIED)
1783 credential_reject(the_repository, &cred);
1784 }
1785
1786 credential_clear(&cred);
1787
1788 return res != CURLE_OK;
1789 }
1790 #endif
1791
1792 int cmd_main(int argc, const char **argv)
1793 {
1794 struct imap_server_conf server = {
1795 .ssl_verify = 1,
1796 };
1797 struct strbuf all_msgs = STRBUF_INIT;
1798 int total;
1799 int nongit_ok;
1800 int ret;
1801
1802 setup_git_directory_gently(the_repository, &nongit_ok);
1803 repo_config(the_repository, git_imap_config, &server);
1804
1805 argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1806
1807 if (opt_folder) {
1808 free(server.folder);
1809 server.folder = xstrdup(opt_folder);
1810 }
1811
1812 if (argc)
1813 usage_with_options(imap_send_usage, imap_send_options);
1814
1815 #ifndef USE_CURL_FOR_IMAP_SEND
1816 if (use_curl) {
1817 warning("--curl not supported in this build");
1818 use_curl = 0;
1819 }
1820 #elif defined(NO_OPENSSL)
1821 if (!use_curl) {
1822 warning("--no-curl not supported in this build");
1823 use_curl = 1;
1824 }
1825 #endif
1826
1827 if (!server.port)
1828 server.port = server.use_ssl ? 993 : 143;
1829
1830 if (!server.host) {
1831 if (!server.tunnel) {
1832 error(_("no IMAP host specified"));
1833 advise(_("set the IMAP host with 'git config imap.host <host>'.\n"
1834 "(e.g., 'git config imap.host imaps://imap.example.com')"));
1835 ret = 1;
1836 goto out;
1837 }
1838 server.host = xstrdup("tunnel");
1839 }
1840
1841 if (list_folders) {
1842 if (server.tunnel)
1843 ret = list_imap_folders(&server);
1844 #ifdef USE_CURL_FOR_IMAP_SEND
1845 else if (use_curl)
1846 ret = curl_list_imap_folders(&server);
1847 #endif
1848 else
1849 ret = list_imap_folders(&server);
1850 goto out;
1851 }
1852
1853 if (!server.folder) {
1854 error(_("no IMAP folder specified"));
1855 advise(_("set the target folder with 'git config imap.folder <folder>'.\n"
1856 "(e.g., 'git config imap.folder Drafts')"));
1857 ret = 1;
1858 goto out;
1859 }
1860
1861 /* read the messages */
1862 if (strbuf_read(&all_msgs, 0, 0) < 0) {
1863 error_errno(_("could not read from stdin"));
1864 ret = 1;
1865 goto out;
1866 }
1867
1868 if (all_msgs.len == 0) {
1869 fprintf(stderr, "nothing to send\n");
1870 ret = 1;
1871 goto out;
1872 }
1873
1874 total = count_messages(&all_msgs);
1875 if (!total) {
1876 fprintf(stderr, "no messages found to send\n");
1877 ret = 1;
1878 goto out;
1879 }
1880
1881 /* write it to the imap server */
1882
1883 if (server.tunnel)
1884 ret = append_msgs_to_imap(&server, &all_msgs, total);
1885 #ifdef USE_CURL_FOR_IMAP_SEND
1886 else if (use_curl)
1887 ret = curl_append_msgs_to_imap(&server, &all_msgs, total);
1888 #endif
1889 else
1890 ret = append_msgs_to_imap(&server, &all_msgs, total);
1891
1892 out:
1893 free(server.tunnel);
1894 free(server.host);
1895 free(server.folder);
1896 free(server.user);
1897 free(server.pass);
1898 free(server.auth_method);
1899 strbuf_release(&all_msgs);
1900 return ret;
1901 }