diff options
Diffstat (limited to 'src/lda')
| -rw-r--r-- | src/lda/Makefile.am | 38 | ||||
| -rw-r--r-- | src/lda/Makefile.in | 822 | ||||
| -rw-r--r-- | src/lda/main.c | 596 |
3 files changed, 1456 insertions, 0 deletions
diff --git a/src/lda/Makefile.am b/src/lda/Makefile.am new file mode 100644 index 0000000..eb18079 --- /dev/null +++ b/src/lda/Makefile.am @@ -0,0 +1,38 @@ +pkglibexecdir = $(libexecdir)/dovecot + +pkglibexec_PROGRAMS = dovecot-lda + +AM_CPPFLAGS = \ + -I$(top_srcdir)/src/lib \ + -I$(top_srcdir)/src/lib-settings \ + -I$(top_srcdir)/src/lib-mail \ + -I$(top_srcdir)/src/lib-smtp \ + -I$(top_srcdir)/src/lib-imap \ + -I$(top_srcdir)/src/lib-index \ + -I$(top_srcdir)/src/lib-master \ + -I$(top_srcdir)/src/lib-smtp \ + -I$(top_srcdir)/src/lib-lda \ + -I$(top_srcdir)/src/lib-storage \ + -I$(top_srcdir)/src/lib-storage/index \ + -I$(top_srcdir)/src/lib-storage/index/raw \ + $(BINARY_CFLAGS) + +dovecot_lda_LDFLAGS = -export-dynamic + +dovecot_lda_LDADD = \ + $(LIBDOVECOT_LDA) \ + $(LIBDOVECOT_STORAGE) \ + $(LIBDOVECOT) \ + $(BINARY_LDFLAGS) + +dovecot_lda_DEPENDENCIES = \ + $(LIBDOVECOT_LDA) \ + $(LIBDOVECOT_STORAGE_DEPS) \ + $(LIBDOVECOT_DEPS) + +dovecot_lda_SOURCES = \ + main.c + +install-exec-local: + rm -f $(DESTDIR)$(pkglibexecdir)/deliver + $(LN_S) dovecot-lda $(DESTDIR)$(pkglibexecdir)/deliver diff --git a/src/lda/Makefile.in b/src/lda/Makefile.in new file mode 100644 index 0000000..f7d872b --- /dev/null +++ b/src/lda/Makefile.in @@ -0,0 +1,822 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; the Free Software Foundation +# gives unlimited permission to copy and/or distribute it, +# with or without modifications, as long as this notice is preserved. + +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY, to the extent permitted by law; without +# even the implied warranty of MERCHANTABILITY or FITNESS FOR A +# PARTICULAR PURPOSE. + +@SET_MAKE@ + +VPATH = @srcdir@ +am__is_gnu_make = { \ + if test -z '$(MAKELEVEL)'; then \ + false; \ + elif test -n '$(MAKE_HOST)'; then \ + true; \ + 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"lib-signals.h" +#include "ioloop.h" +#include "env-util.h" +#include "istream.h" +#include "istream-seekable.h" +#include "path-util.h" +#include "safe-mkstemp.h" +#include "eacces-error.h" +#include "ipwd.h" +#include "str.h" +#include "str-sanitize.h" +#include "strescape.h" +#include "unichar.h" +#include "rfc822-parser.h" +#include "message-address.h" +#include "smtp-address.h" +#include "settings-parser.h" +#include "master-service.h" +#include "master-service-settings.h" +#include "mail-storage-service.h" +#include "mail-namespace.h" +#include "raw-storage.h" +#include "mail-deliver.h" +#include "mail-send.h" +#include "mbox-from.h" +#include "smtp-submit-settings.h" +#include "lda-settings.h" + +#include <stdio.h> +#include <sysexits.h> + +const struct smtp_address default_envelope_sender = { + .localpart = "MAILER-DAEMON", +}; + +/* After buffer grows larger than this, create a temporary file to /tmp + where to read the mail. */ +#define MAIL_MAX_MEMORY_BUFFER (1024*128) + +struct event_category event_category_lda = { + .name = "lda", +}; + +static const char *wanted_headers[] = { + "From", "To", "Message-ID", "Subject", "Return-Path", + NULL +}; + +static int seekable_fd_callback(const char **path_r, void *context) +{ + struct mail_deliver_input *dinput = context; + string_t *path; + int fd; + + path = t_str_new(128); + mail_user_set_get_temp_prefix(path, dinput->rcpt_user->set); + fd = safe_mkstemp(path, 0600, (uid_t)-1, (gid_t)-1); + if (fd == -1) { + i_error("safe_mkstemp(%s) failed: %m", str_c(path)); + return -1; + } + + /* we just want the fd, unlink it */ + if (i_unlink(str_c(path)) < 0) { + /* shouldn't happen.. */ + i_close_fd(&fd); + return -1; + } + + *path_r = str_c(path); + return fd; +} + +static struct istream * +create_raw_stream(struct mail_deliver_input *dinput, + int fd, time_t *mtime_r) +{ + struct istream *input, *input2, *input_list[2]; + const unsigned char *data; + const char *error; + char *sender = NULL; + size_t i, size; + int ret, tz; + + *mtime_r = (time_t)-1; + fd_set_nonblock(fd, FALSE); + + input = i_stream_create_fd(fd, 4096); + input->blocking = TRUE; + /* If input begins with a From-line, drop it */ + ret = i_stream_read_bytes(input, &data, &size, 5); + if (ret > 0 && memcmp(data, "From ", 5) == 0) { + /* skip until the first LF */ + i_stream_skip(input, 5); + while (i_stream_read_more(input, &data, &size) > 0) { + for (i = 0; i < size; i++) { + if (data[i] == '\n') + break; + } + if (i != size) { + (void)mbox_from_parse(data, i, mtime_r, &tz, + &sender); + i_stream_skip(input, i + 1); + break; + } + i_stream_skip(input, size); + } + } + + if (sender != NULL && dinput->mail_from == NULL) { + struct smtp_address *mail_from = NULL; + /* use the envelope sender from From_-line, but only if it + hasn't been specified with -f already. */ + if (smtp_address_parse_mailbox(pool_datastack_create(), + sender, 0, &mail_from, + &error) < 0) { + i_warning("Failed to parse address from `From_'-line: %s", + error); + } + dinput->mail_from = mail_from; + } + i_free(sender); + + if (input->v_offset == 0) { + input2 = input; + i_stream_ref(input2); + } else { + input2 = i_stream_create_limit(input, UOFF_T_MAX); + } + i_stream_unref(&input); + + input_list[0] = input2; input_list[1] = NULL; + input = i_stream_create_seekable(input_list, MAIL_MAX_MEMORY_BUFFER, + seekable_fd_callback, dinput); + i_stream_unref(&input2); + return input; +} + +static struct mail * +lda_raw_mail_open(struct mail_deliver_input *dinput, const char *path) +{ + struct mail_user *raw_mail_user; + struct mailbox *box; + struct mailbox_transaction_context *t; + struct mail *mail; + struct mailbox_header_lookup_ctx *headers_ctx; + const struct smtp_address *mail_from; + struct istream *input; + void **sets; + time_t mtime; + int ret; + + sets = master_service_settings_get_others(master_service); + raw_mail_user = raw_storage_create_from_set(dinput->rcpt_user->set_info, + sets[0]); + + mail_from = (dinput->mail_from != NULL ? + dinput->mail_from : &default_envelope_sender); + if (path == NULL) { + input = create_raw_stream(dinput, 0, &mtime); + i_stream_set_name(input, "stdin"); + ret = raw_mailbox_alloc_stream(raw_mail_user, input, mtime, + smtp_address_encode(mail_from), &box); + i_stream_unref(&input); + } else { + ret = raw_mailbox_alloc_path(raw_mail_user, path, (time_t)-1, + smtp_address_encode(mail_from), &box); + } + if (ret < 0) { + i_fatal("Can't open delivery mail as raw: %s", + mailbox_get_last_internal_error(box, NULL)); + } + mail_user_unref(&raw_mail_user); + + t = mailbox_transaction_begin(box, 0, __func__); + headers_ctx = mailbox_header_lookup_init(box, wanted_headers); + mail = mail_alloc(t, 0, headers_ctx); + mailbox_header_lookup_unref(&headers_ctx); + mail_set_seq(mail, 1); + return mail; +} + +static void +lda_set_rcpt_to(struct mail_deliver_input *dinput, + const struct smtp_address *rcpt_to, const char *user, + const char *rcpt_to_source) +{ + const char *error; + + if (rcpt_to == NULL && + *dinput->set->lda_original_recipient_header != '\0') { + rcpt_to = mail_deliver_get_address( + dinput->src_mail, + dinput->set->lda_original_recipient_header); + rcpt_to_source = t_strconcat( + dinput->set->lda_original_recipient_header, + " header", NULL); + } + if (rcpt_to == NULL) { + struct smtp_address *user_addr; + + if (smtp_address_parse_username(pool_datastack_create(), user, + &user_addr, &error) < 0) { + i_fatal_status(EX_USAGE, + "Cannot obtain SMTP address from username `%s': %s", + user, error); + } + if (user_addr->domain == NULL) + user_addr->domain = dinput->set->hostname; + rcpt_to = user_addr; + rcpt_to_source = "user@hostname"; + } + + dinput->rcpt_params.orcpt.addr = rcpt_to; + if (dinput->rcpt_to == NULL) + dinput->rcpt_to = rcpt_to; + + e_debug(dinput->rcpt_user->event, + "Destination address: %s (source: %s)", + smtp_address_encode_path(rcpt_to), rcpt_to_source); +} + +static int +lda_do_deliver(struct mail_deliver_context *ctx, bool stderr_rejection) +{ + enum mail_deliver_error error_code; + const char *error; + int ret; + + if (mail_deliver(ctx, &error_code, &error) >= 0) + return EX_OK; + + if (error_code == MAIL_DELIVER_ERROR_INTERNAL) { + /* This shouldn't happen */ + return EX_TEMPFAIL; + } + + if (stderr_rejection) { + /* write to stderr also for tempfails so that MTA + can log the reason if it wants to. */ + fprintf(stderr, "%s\n", error); + } + + switch (error_code) { + case MAIL_DELIVER_ERROR_NONE: + i_unreached(); + case MAIL_DELIVER_ERROR_TEMPORARY: + return EX_TEMPFAIL; + case MAIL_DELIVER_ERROR_REJECTED: + break; + case MAIL_DELIVER_ERROR_NOQUOTA: + if (ctx->set->quota_full_tempfail) + return EX_TEMPFAIL; + ctx->mailbox_full = TRUE; + break; + case MAIL_DELIVER_ERROR_INTERNAL: + i_unreached(); + } + + /* Rejected */ + + ctx->dsn = TRUE; + + /* we'll have to reply with permanent failure */ + mail_deliver_log(ctx, "rejected: %s", + str_sanitize(error, 512)); + + if (stderr_rejection) + return EX_NOPERM; + ret = mail_send_rejection(ctx, ctx->rcpt_to, error); + if (ret != 0) + return ret < 0 ? EX_TEMPFAIL : ret; + /* ok, rejection sent */ + + return EX_OK; +} + +static int +lda_deliver(struct mail_deliver_input *dinput, + struct mail_storage_service_user *service_user, + const char *user, const char *path, + struct smtp_address *rcpt_to, const char *rcpt_to_source, + bool stderr_rejection) +{ + struct mail_deliver_context ctx; + const struct var_expand_table *var_table; + struct lda_settings *lda_set; + struct smtp_submit_settings *smtp_set; + const char *errstr; + int ret; + + var_table = mail_user_var_expand_table(dinput->rcpt_user); + smtp_set = mail_storage_service_user_get_set(service_user)[1]; + lda_set = mail_storage_service_user_get_set(service_user)[2]; + ret = settings_var_expand( + &lda_setting_parser_info, + lda_set, dinput->rcpt_user->pool, var_table, + &errstr); + if (ret > 0) { + ret = settings_var_expand( + &smtp_submit_setting_parser_info, + smtp_set, dinput->rcpt_user->pool, var_table, + &errstr); + } + if (ret <= 0) + i_fatal("Failed to expand settings: %s", errstr); + dinput->set = lda_set; + dinput->smtp_set = smtp_set; + + dinput->src_mail = lda_raw_mail_open(dinput, path); + lda_set_rcpt_to(dinput, rcpt_to, user, rcpt_to_source); + + mail_deliver_init(&ctx, dinput); + ret = lda_do_deliver(&ctx, stderr_rejection); + mail_deliver_deinit(&ctx); + + return ret; +} + +static void failure_exit_callback(int *status) +{ + /* we want all our exit codes to be sysexits.h compatible. + if we failed because of a logging related error, we most likely + aren't writing to stderr, so try writing there to give some kind of + a clue what's wrong. FATAL_LOGOPEN failure already wrote to + stderr, so don't duplicate it. */ + switch (*status) { + case FATAL_LOGWRITE: + fputs("Failed to write to log file", stderr); + break; + case FATAL_LOGERROR: + fputs("Internal logging error", stderr); + break; + case FATAL_LOGOPEN: + case FATAL_OUTOFMEM: + case FATAL_EXEC: + case FATAL_DEFAULT: + break; + default: + return; + } + *status = EX_TEMPFAIL; +} + +static void print_help(void) +{ + printf( +"Usage: dovecot-lda [-c <config file>] [-d <username>] [-p <path>]\n" +" [-m <mailbox>] [-e] [-k] [-f <envelope sender>]\n" +" [-a <original envelope recipient>]\n" +" [-r <final envelope recipient>] \n"); +} + +int main(int argc, char *argv[]) +{ + const struct setting_parser_info *set_roots[] = { + &smtp_submit_setting_parser_info, + &lda_setting_parser_info, + NULL + }; + struct mail_deliver_input dinput; + enum mail_storage_service_flags service_flags = 0; + const char *user, *errstr, *path; + struct smtp_address *rcpt_to, *final_rcpt_to, *mail_from; + struct mail_storage_service_ctx *storage_service; + struct mail_storage_service_user *service_user; + struct mail_storage_service_input service_input; + struct event *event; + const char *user_source = "", *rcpt_to_source = "", *mail_from_error; + uid_t process_euid; + bool stderr_rejection = FALSE; + int ret, c; + + if (getuid() != geteuid() && geteuid() == 0) { + /* running setuid - don't allow this if the binary is + executable by anyone */ + struct stat st; + + if (stat(argv[0], &st) < 0) { + fprintf(stderr, "stat(%s) failed: %s\n", + argv[0], strerror(errno)); + return EX_TEMPFAIL; + } else if ((st.st_mode & 1) != 0 && (st.st_mode & 04000) != 0) { + fprintf(stderr, "%s must not be both world-executable " + "and setuid-root. This allows root exploits. " + "See http://wiki2.dovecot.org/LDA#multipleuids\n", + argv[0]); + return EX_TEMPFAIL; + } + } + + i_set_failure_exit_callback(failure_exit_callback); + + master_service = master_service_init("lda", + MASTER_SERVICE_FLAG_STANDALONE | + MASTER_SERVICE_FLAG_DONT_LOG_TO_STDERR | + MASTER_SERVICE_FLAG_NO_INIT_DATASTACK_FRAME, + &argc, &argv, "a:d:ef:m:p:r:"); + + event = event_create(NULL); + event_add_category(event, &event_category_lda); + + i_zero(&dinput); + dinput.session = mail_deliver_session_init(); + dinput.rcpt_default_mailbox = "INBOX"; + path = NULL; + + user = getenv("USER"); + mail_from = final_rcpt_to = rcpt_to = NULL; + mail_from_error = NULL; + while ((c = master_getopt(master_service)) > 0) { + switch (c) { + case 'a': + /* original recipient address */ + if (smtp_address_parse_path( + pool_datastack_create(), optarg, + SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART | + SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL, + &rcpt_to, &errstr) < 0) { + i_fatal_status(EX_USAGE, + "Invalid -a parameter: %s", errstr); + } + rcpt_to_source = "-a parameter"; + break; + case 'd': + /* destination user */ + user = optarg; + service_flags |= MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP; + break; + case 'e': + stderr_rejection = TRUE; + break; + case 'f': + /* envelope sender address */ + ret = smtp_address_parse_path( + pool_datastack_create(), optarg, + SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL | + SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART | + SMTP_ADDRESS_PARSE_FLAG_ALLOW_EMPTY | + SMTP_ADDRESS_PARSE_FLAG_IGNORE_BROKEN | + SMTP_ADDRESS_PARSE_FLAG_PRESERVE_RAW, + &mail_from, &errstr); + if (ret < 0 && !smtp_address_is_broken(mail_from)) { + i_fatal_status(EX_USAGE, + "Invalid -f parameter: %s", errstr); + } + if (ret < 0) + mail_from_error = errstr; + break; + case 'm': + /* destination mailbox. + Ignore -m "". This allows doing -m ${extension} + in Postfix to handle user+mailbox */ + if (*optarg != '\0') T_BEGIN { + if (!uni_utf8_str_is_valid(optarg)) { + i_fatal("Mailbox name not UTF-8: %s", + optarg); + } + dinput.rcpt_default_mailbox = optarg; + } T_END; + break; + case 'p': + /* input path */ + if (t_abspath(optarg, &path, &errstr) < 0) { + i_fatal("t_abspath(%s) failed: %s", + optarg, errstr); + } + break; + case 'r': + /* final recipient address */ + if (smtp_address_parse_path( + pool_datastack_create(), optarg, + SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART | + SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL, + &final_rcpt_to, &errstr) < 0) { + i_fatal_status(EX_USAGE, + "Invalid -r parameter: %s", errstr); + } + break; + default: + print_help(); + return EX_USAGE; + } + } + if (optind != argc) { + print_help(); + i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]); + } + + process_euid = geteuid(); + if ((service_flags & MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP) != 0) + ; + else if (process_euid != 0) { + /* we're non-root. get our username and possibly our home. */ + struct passwd pw; + const char *home; + + home = getenv("HOME"); + if (user != NULL && home != NULL) { + /* no need for a pw lookup */ + user_source = "USER environment"; + } else if ((ret = i_getpwuid(process_euid, &pw)) > 0) { + user = t_strdup(pw.pw_name); + if (home == NULL) + env_put("HOME", pw.pw_dir); + user_source = "passwd lookup for process euid"; + } else if (ret < 0) { + /* temporary failure */ + i_fatal("getpwuid() failed: %m"); + } else if (user == NULL) { + i_fatal_status(EX_USAGE, + "Couldn't lookup our username (uid=%s)", + dec2str(process_euid)); + } + } else { + i_fatal_status(EX_USAGE, + "destination user parameter (-d user) not given"); + } + master_service_init_finish(master_service); + + dinput.mail_from = mail_from; + dinput.rcpt_to = final_rcpt_to; + + event_add_str(event, "protocol", "lda"); + event_add_str(event, "user", user); + if (mail_from != NULL) { + event_add_str(event, "mail_from", + smtp_address_encode(mail_from)); + } + if (final_rcpt_to != NULL) { + event_add_str(event, "rcpt_to", + smtp_address_encode(final_rcpt_to)); + } + dinput.event_parent = event; + + i_zero(&service_input); + service_input.module = "lda"; + service_input.service = "lda"; + service_input.username = user; + service_input.event_parent = event; + + service_flags |= MAIL_STORAGE_SERVICE_FLAG_USE_SYSEXITS; + storage_service = mail_storage_service_init(master_service, set_roots, + service_flags); + mail_deliver_hooks_init(); + /* set before looking up the user (or ideally we'd do this between + _lookup() and _next(), but don't bother) */ + dinput.delivery_time_started = ioloop_timeval; + ret = mail_storage_service_lookup_next(storage_service, + &service_input, &service_user, + &dinput.rcpt_user, + &errstr); + if (ret <= 0) { + if (ret < 0) + i_fatal("%s", errstr); + ret = EX_NOUSER; + } else { +#ifdef SIGXFSZ + lib_signals_ignore(SIGXFSZ, TRUE); +#endif + if (*user_source != '\0') { + e_debug(dinput.rcpt_user->event, + "userdb lookup skipped, username taken from %s", + user_source); + } + if (mail_from_error != NULL) { + e_debug(event, "Broken -f parameter: %s " + "(proceeding with <> as sender)", + mail_from_error); + } + + ret = lda_deliver(&dinput, service_user, user, path, + rcpt_to, rcpt_to_source, stderr_rejection); + + struct mailbox_transaction_context *t = + dinput.src_mail->transaction; + struct mailbox *box = dinput.src_mail->box; + + mail_free(&dinput.src_mail); + mailbox_transaction_rollback(&t); + mailbox_free(&box); + + mail_user_deinit(&dinput.rcpt_user); + mail_storage_service_user_unref(&service_user); + } + + mail_deliver_session_deinit(&dinput.session); + mail_storage_service_deinit(&storage_service); + + event_unref(&event); + master_service_deinit(&master_service); + return ret; +} |