X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/9242a7e8cfa94bbc9dd7eca6bd651b569b871c4e..f7509ba6fb5e1033c1406b87f057c9c48a217d27:/src/src/transports/autoreply.c diff --git a/src/src/transports/autoreply.c b/src/src/transports/autoreply.c index bf31951fa..ed99de4c6 100644 --- a/src/src/transports/autoreply.c +++ b/src/src/transports/autoreply.c @@ -2,7 +2,8 @@ * Exim - an Internet mail transport agent * *************************************************/ -/* Copyright (c) University of Cambridge 1995 - 2017 */ +/* Copyright (c) University of Cambridge 1995 - 2018 */ +/* Copyright (c) The Exim Maintainers 2020 */ /* See the file NOTICE for conditions of use and distribution. */ @@ -16,44 +17,27 @@ order (note that "_" comes before the lower case letters). Those starting with "*" are not settable by the user but are used by the option-reading software for alternative value types. Some options are publicly visible and so are stored in the driver instance block. These are flagged with opt_public. */ +#define LOFF(field) OPT_OFF(autoreply_transport_options_block, field) optionlist autoreply_transport_options[] = { - { "bcc", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, bcc) }, - { "cc", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, cc) }, - { "file", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, file) }, - { "file_expand", opt_bool, - (void *)offsetof(autoreply_transport_options_block, file_expand) }, - { "file_optional", opt_bool, - (void *)offsetof(autoreply_transport_options_block, file_optional) }, - { "from", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, from) }, - { "headers", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, headers) }, - { "log", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, logfile) }, - { "mode", opt_octint, - (void *)offsetof(autoreply_transport_options_block, mode) }, - { "never_mail", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, never_mail) }, - { "once", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, oncelog) }, - { "once_file_size", opt_int, - (void *)offsetof(autoreply_transport_options_block, once_file_size) }, - { "once_repeat", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, once_repeat) }, - { "reply_to", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, reply_to) }, - { "return_message", opt_bool, - (void *)offsetof(autoreply_transport_options_block, return_message) }, - { "subject", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, subject) }, - { "text", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, text) }, - { "to", opt_stringptr, - (void *)offsetof(autoreply_transport_options_block, to) }, + { "bcc", opt_stringptr, LOFF(bcc) }, + { "cc", opt_stringptr, LOFF(cc) }, + { "file", opt_stringptr, LOFF(file) }, + { "file_expand", opt_bool, LOFF(file_expand) }, + { "file_optional", opt_bool, LOFF(file_optional) }, + { "from", opt_stringptr, LOFF(from) }, + { "headers", opt_stringptr, LOFF(headers) }, + { "log", opt_stringptr, LOFF(logfile) }, + { "mode", opt_octint, LOFF(mode) }, + { "never_mail", opt_stringptr, LOFF(never_mail) }, + { "once", opt_stringptr, LOFF(oncelog) }, + { "once_file_size", opt_int, LOFF(once_file_size) }, + { "once_repeat", opt_stringptr, LOFF(once_repeat) }, + { "reply_to", opt_stringptr, LOFF(reply_to) }, + { "return_message", opt_bool, LOFF(return_message) }, + { "subject", opt_stringptr, LOFF(subject) }, + { "text", opt_stringptr, LOFF(text) }, + { "to", opt_stringptr, LOFF(to) }, }; /* Size of the options list. An extern variable has to be used so that its @@ -154,10 +138,9 @@ Returns: expanded string if expansion succeeds; static uschar * checkexpand(uschar *s, address_item *addr, uschar *name, int type) { -uschar *t; uschar *ss = expand_string(s); -if (ss == NULL) +if (!ss) { addr->transport_return = FAIL; addr->message = string_sprintf("Expansion of \"%s\" failed in %s transport: " @@ -165,7 +148,7 @@ if (ss == NULL) return NULL; } -if (type != cke_text) for (t = ss; *t != 0; t++) +if (type != cke_text) for (uschar * t = ss; *t != 0; t++) { int c = *t; const uschar * sp; @@ -220,7 +203,7 @@ while (*s != 0) /* If there is some kind of syntax error, just give up on this header line. */ - if (next == NULL) break; + if (!next) break; /* See if the address is on the never_mail list */ @@ -290,7 +273,7 @@ uschar *message_id = NULL; header_line *h; time_t now = time(NULL); time_t once_repeat_sec = 0; -FILE *f; +FILE *fp; FILE *ff = NULL; autoreply_transport_options_block *ob = @@ -308,7 +291,7 @@ from that block. It has typically been set up by a mail filter processing router. Otherwise, the data must be supplied by this transport, and it has to be expanded here. */ -if (addr->reply != NULL) +if (addr->reply) { DEBUG(D_transport) debug_printf("taking data from address\n"); from = addr->reply->from; @@ -403,7 +386,7 @@ if (ob->never_mail) /* If the -N option is set, can't do any more. */ -if (dont_deliver) +if (f.dont_deliver) { DEBUG(D_transport) debug_printf("*** delivery by %s transport bypassed by -N option\n", @@ -419,25 +402,35 @@ recipient, the effect might not be quite as envisaged. If once_file_size is set, instead of a dbm file, we use a regular file containing a circular buffer recipient cache. */ -if (oncelog && *oncelog != 0 && to) +if (oncelog && *oncelog && to) { + uschar *m; time_t then = 0; + if (m = is_tainted2(oncelog, 0, "Tainted '%s' (once file for %s transport)" + " not permitted", oncelog, tblock->name)) + { + addr->transport_return = DEFER; + addr->basic_errno = EACCES; + addr->message = m; + goto END_OFF; + } + /* Handle fixed-size cache file. */ if (ob->once_file_size > 0) { - uschar * p, * nextp; + uschar * nextp; struct stat statbuf; - cache_fd = Uopen(oncelog, O_CREAT|O_RDWR, ob->mode); + cache_fd = Uopen(oncelog, O_CREAT|O_RDWR, ob->mode); if (cache_fd < 0 || fstat(cache_fd, &statbuf) != 0) { addr->transport_return = DEFER; + addr->basic_errno = errno; addr->message = string_sprintf("Failed to %s \"once\" file %s when " "sending message from %s transport: %s", - (cache_fd < 0)? "open" : "stat", oncelog, tblock->name, - strerror(errno)); + cache_fd < 0 ? "open" : "stat", oncelog, tblock->name, strerror(errno)); goto END_OFF; } @@ -447,7 +440,7 @@ if (oncelog && *oncelog != 0 && to) cache_size = statbuf.st_size; add_size = sizeof(time_t) + Ustrlen(to) + 1; - cache_buff = store_get(cache_size + add_size); + cache_buff = store_get(cache_size + add_size, is_tainted(oncelog)); if (read(cache_fd, cache_buff, cache_size) != cache_size) { @@ -464,7 +457,7 @@ if (oncelog && *oncelog != 0 && to) zero. If we find a match, put the time into "then", and the place where it was found into "cache_time". Otherwise, "then" is left at zero. */ - for (p = cache_buff; p < cache_buff + cache_size; p = nextp) + for (uschar * p = cache_buff; p < cache_buff + cache_size; p = nextp) { uschar *s = p + sizeof(time_t); nextp = s + Ustrlen(s) + 1; @@ -482,14 +475,15 @@ if (oncelog && *oncelog != 0 && to) else { EXIM_DATUM key_datum, result_datum; - uschar * dirname = string_copy(oncelog); - uschar * s; + uschar * dirname, * s; - if ((s = Ustrrchr(dirname, '/'))) *s = '\0'; + dirname = (s = Ustrrchr(oncelog, '/')) + ? string_copyn(oncelog, s - oncelog) : NULL; EXIM_DBOPEN(oncelog, dirname, O_RDWR|O_CREAT, ob->mode, &dbm_file); if (!dbm_file) { addr->transport_return = DEFER; + addr->basic_errno = errno; addr->message = string_sprintf("Failed to open %s file %s when sending " "message from %s transport: %s", EXIM_DBTYPE, oncelog, tblock->name, strerror(errno)); @@ -522,7 +516,17 @@ if (oncelog && *oncelog != 0 && to) if (then != 0 && (once_repeat_sec <= 0 || now - then < once_repeat_sec)) { + uschar *m; int log_fd; + if (m = is_tainted2(logfile, 0, "Tainted '%s' (logfile for %s transport)" + " not permitted", logfile, tblock->name)) + { + addr->transport_return = DEFER; + addr->basic_errno = EACCES; + addr->message = m; + goto END_OFF; + } + DEBUG(D_transport) debug_printf("message previously sent to %s%s\n", to, (once_repeat_sec > 0)? " and repeat time not reached" : ""); log_fd = logfile ? Uopen(logfile, O_WRONLY|O_APPEND|O_CREAT, ob->mode) : -1; @@ -544,13 +548,21 @@ if (oncelog && *oncelog != 0 && to) } /* We are going to send a message. Ensure any requested file is available. */ - if (file) { - ff = Ufopen(file, "rb"); - if (!ff && !ob->file_optional) + uschar *m; + if (m = is_tainted2(file, 0, "Tainted '%s' (file for %s transport)" + " not permitted", file, tblock->name)) { addr->transport_return = DEFER; + addr->basic_errno = EACCES; + addr->message = m; + return FALSE; + } + if (!(ff = Ufopen(file, "rb")) && !ob->file_optional) + { + addr->transport_return = DEFER; + addr->basic_errno = errno; addr->message = string_sprintf("Failed to open file %s when sending " "message from %s transport: %s", file, tblock->name, strerror(errno)); return FALSE; @@ -559,13 +571,12 @@ if (file) /* Make a subprocess to send the message */ -pid = child_open_exim(&fd); - -/* Creation of child failed; defer this delivery. */ - -if (pid < 0) +if ((pid = child_open_exim(&fd, US"autoreply")) < 0) { + /* Creation of child failed; defer this delivery. */ + addr->transport_return = DEFER; + addr->basic_errno = errno; addr->message = string_sprintf("Failed to create child process to send " "message from %s transport: %s", tblock->name, strerror(errno)); DEBUG(D_transport) debug_printf("%s\n", addr->message); @@ -577,14 +588,14 @@ if (pid < 0) as the -t option is used. The "headers" stuff *must* be last in case there are newlines in it which might, if placed earlier, screw up other headers. */ -f = fdopen(fd, "wb"); +fp = fdopen(fd, "wb"); -if (from) fprintf(f, "From: %s\n", from); -if (reply_to) fprintf(f, "Reply-To: %s\n", reply_to); -if (to) fprintf(f, "To: %s\n", to); -if (cc) fprintf(f, "Cc: %s\n", cc); -if (bcc) fprintf(f, "Bcc: %s\n", bcc); -if (subject) fprintf(f, "Subject: %s\n", subject); +if (from) fprintf(fp, "From: %s\n", from); +if (reply_to) fprintf(fp, "Reply-To: %s\n", reply_to); +if (to) fprintf(fp, "To: %s\n", to); +if (cc) fprintf(fp, "Cc: %s\n", cc); +if (bcc) fprintf(fp, "Bcc: %s\n", bcc); +if (subject) fprintf(fp, "Subject: %s\n", subject); /* Generate In-Reply-To from the message_id header; there should always be one, but code defensively. */ @@ -596,70 +607,24 @@ if (h) { message_id = Ustrchr(h->text, ':') + 1; while (isspace(*message_id)) message_id++; - fprintf(f, "In-Reply-To: %s", message_id); + fprintf(fp, "In-Reply-To: %s", message_id); } -/* Generate a References header if there is at least one of Message-ID:, -References:, or In-Reply-To: (see RFC 2822). */ - -for (h = header_list; h; h = h->next) - if (h->type != htype_old && strncmpic(US"References:", h->text, 11) == 0) - break; - -if (!h) - for (h = header_list; h; h = h->next) - if (h->type != htype_old && strncmpic(US"In-Reply-To:", h->text, 12) == 0) - break; - -/* We limit the total length of references. Although there is no fixed -limit, some systems do not like headers growing beyond recognition. -Keep the first message ID for the thread root and the last few for -the position inside the thread, up to a maximum of 12 altogether. */ - -if (h || message_id) - { - fprintf(f, "References:"); - if (h) - { - uschar *s, *id, *error; - uschar *referenced_ids[12]; - int reference_count = 0; - int i; - - s = Ustrchr(h->text, ':') + 1; - parse_allow_group = FALSE; - while (*s != 0 && (s = parse_message_id(s, &id, &error)) != NULL) - { - if (reference_count == nelem(referenced_ids)) - { - memmove(referenced_ids + 1, referenced_ids + 2, - sizeof(referenced_ids) - 2*sizeof(uschar *)); - referenced_ids[reference_count - 1] = id; - } - else referenced_ids[reference_count++] = id; - } - for (i = 0; i < reference_count; ++i) fprintf(f, " %s", referenced_ids[i]); - } - - /* The message id will have a newline on the end of it. */ - - if (message_id) fprintf(f, " %s", message_id); - else fprintf(f, "\n"); - } +moan_write_references(fp, message_id); /* Add an Auto-Submitted: header */ -fprintf(f, "Auto-Submitted: auto-replied\n"); +fprintf(fp, "Auto-Submitted: auto-replied\n"); /* Add any specially requested headers */ -if (headers) fprintf(f, "%s\n", headers); -fprintf(f, "\n"); +if (headers) fprintf(fp, "%s\n", headers); +fprintf(fp, "\n"); if (text) { - fprintf(f, "%s", CS text); - if (text[Ustrlen(text)-1] != '\n') fprintf(f, "\n"); + fprintf(fp, "%s", CS text); + if (text[Ustrlen(text)-1] != '\n') fprintf(fp, "\n"); } if (ff) @@ -675,9 +640,9 @@ if (ff) debug_printf("error while expanding line from file:\n %s\n %s\n", big_buffer, expand_string_message); } - fprintf(f, "%s", s ? CS s : CS big_buffer); + fprintf(fp, "%s", s ? CS s : CS big_buffer); } - else fprintf(f, "%s", CS big_buffer); + else fprintf(fp, "%s", CS big_buffer); } (void) fclose(ff); } @@ -694,15 +659,17 @@ if (return_message) : US"------ This is a copy of the message, including all the headers.\n"; transport_ctx tctx = { - {fileno(f)}, - tblock, - addr, - NULL, NULL, - (tblock->body_only ? topt_no_headers : 0) | - (tblock->headers_only ? topt_no_body : 0) | - (tblock->return_path_add ? topt_add_return_path : 0) | - (tblock->delivery_date_add ? topt_add_delivery_date : 0) | - (tblock->envelope_to_add ? topt_add_envelope_to : 0) + .u = {.fd = fileno(fp)}, + .tblock = tblock, + .addr = addr, + .check_string = NULL, + .escape_string = NULL, + .options = (tblock->body_only ? topt_no_headers : 0) + | (tblock->headers_only ? topt_no_body : 0) + | (tblock->return_path_add ? topt_add_return_path : 0) + | (tblock->delivery_date_add ? topt_add_delivery_date : 0) + | (tblock->envelope_to_add ? topt_add_envelope_to : 0) + | topt_not_socket }; if (bounce_return_size_limit > 0 && !tblock->headers_only) @@ -712,23 +679,23 @@ if (return_message) DELIVER_IN_BUFFER_SIZE; if (fstat(deliver_datafile, &statbuf) == 0 && statbuf.st_size > max) { - fprintf(f, "\n%s" + fprintf(fp, "\n%s" "------ The body of the message is " OFF_T_FMT " characters long; only the first\n" "------ %d or so are included here.\n\n", rubric, statbuf.st_size, (max/1000)*1000); } - else fprintf(f, "\n%s\n", rubric); + else fprintf(fp, "\n%s\n", rubric); } - else fprintf(f, "\n%s\n", rubric); + else fprintf(fp, "\n%s\n", rubric); - fflush(f); + fflush(fp); transport_count = 0; transport_write_message(&tctx, bounce_return_size_limit); } /* End the message and wait for the child process to end; no timeout. */ -(void)fclose(f); +(void)fclose(fp); rc = child_close(pid, 0); /* Update the "sent to" log whatever the yield. This errs on the side of @@ -821,48 +788,26 @@ if (logfile) int log_fd = Uopen(logfile, O_WRONLY|O_APPEND|O_CREAT, ob->mode); if (log_fd >= 0) { - uschar *ptr = log_buffer; + gstring gs = { .size = LOG_BUFFER_SIZE, .ptr = 0, .s = log_buffer }, *g = &gs; + + /* Use taint-unchecked routines for writing into log_buffer, trusting + that we'll never expand it. */ + DEBUG(D_transport) debug_printf("logging message details\n"); - sprintf(CS ptr, "%s\n", tod_stamp(tod_log)); - while(*ptr) ptr++; + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, "%s\n", tod_stamp(tod_log)); if (from) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " From: %s\n", from); - while(*ptr) ptr++; - } + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " From: %s\n", from); if (to) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " To: %s\n", to); - while(*ptr) ptr++; - } + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " To: %s\n", to); if (cc) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " Cc: %s\n", cc); - while(*ptr) ptr++; - } + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " Cc: %s\n", cc); if (bcc) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " Bcc: %s\n", bcc); - while(*ptr) ptr++; - } + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " Bcc: %s\n", bcc); if (subject) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " Subject: %s\n", subject); - while(*ptr) ptr++; - } + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " Subject: %s\n", subject); if (headers) - { - (void)string_format(ptr, LOG_BUFFER_SIZE - (ptr-log_buffer), - " %s\n", headers); - while(*ptr) ptr++; - } - if(write(log_fd, log_buffer, ptr - log_buffer) != ptr-log_buffer - || close(log_fd)) + g = string_fmt_append_f(g, SVFMT_TAINT_NOCHK, " %s\n", headers); + if(write(log_fd, g->s, g->ptr) != g->ptr || close(log_fd)) DEBUG(D_transport) debug_printf("Problem writing log file %s for %s " "transport\n", logfile, tblock->name); }