static void proxymap_service(VSTREAM *client_stream, char *unused_service,
char **argv)
{
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* Deadline enforcement.
*/
if (vstream_fstat(client_stream, VSTREAM_FLAG_DEADLINE) == 0)
vstream_control(client_stream,
VSTREAM_CTL_TIMEOUT, 1,
VSTREAM_CTL_END);
/*
* This routine runs whenever a client connects to the socket dedicated
* to the proxymap service. All connection-management stuff is handled by
* the common code in multi_server.c.
*/
vstream_control(client_stream,
VSTREAM_CTL_START_DEADLINE,
VSTREAM_CTL_END);
if (attr_scan(client_stream,
ATTR_FLAG_MORE | ATTR_FLAG_STRICT,
ATTR_TYPE_STR, MAIL_ATTR_REQ, request,
ATTR_TYPE_END) == 1) {
if (VSTREQ(request, PROXY_REQ_LOOKUP)) {
proxymap_lookup_service(client_stream);
} else if (VSTREQ(request, PROXY_REQ_UPDATE)) {
proxymap_update_service(client_stream);
} else if (VSTREQ(request, PROXY_REQ_DELETE)) {
proxymap_delete_service(client_stream);
} else if (VSTREQ(request, PROXY_REQ_SEQUENCE)) {
proxymap_sequence_service(client_stream);
} else if (VSTREQ(request, PROXY_REQ_OPEN)) {
proxymap_open_service(client_stream);
} else {
msg_warn("unrecognized request: \"%s\", ignored", STR(request));
attr_print(client_stream, ATTR_FLAG_NONE,
ATTR_TYPE_INT, MAIL_ATTR_STATUS, PROXY_STAT_BAD,
ATTR_TYPE_END);
}
}
vstream_control(client_stream,
VSTREAM_CTL_START_DEADLINE,
VSTREAM_CTL_END);
vstream_fflush(client_stream);
}
static int dict_tcp_connect(DICT_TCP *dict_tcp)
{
int fd;
/*
* Connect to the server. Enforce a time limit on all operations so that
* we do not get stuck.
*/
if ((fd = inet_connect(dict_tcp->dict.name, NON_BLOCKING, DICT_TCP_TMOUT)) < 0) {
msg_warn("connect to TCP map %s: %m", dict_tcp->dict.name);
return (-1);
}
dict_tcp->fp = vstream_fdopen(fd, O_RDWR);
vstream_control(dict_tcp->fp,
VSTREAM_CTL_TIMEOUT, DICT_TCP_TMOUT,
VSTREAM_CTL_END);
/*
* Allocate per-map I/O buffers on the fly.
*/
if (dict_tcp->raw_buf == 0) {
dict_tcp->raw_buf = vstring_alloc(10);
dict_tcp->hex_buf = vstring_alloc(10);
}
return (0);
}
void netstring_setup(VSTREAM *stream, int timeout)
{
vstream_control(stream,
VSTREAM_CTL_TIMEOUT, timeout,
VSTREAM_CTL_EXCEPT,
VSTREAM_CTL_END);
}
static void tlsp_service(VSTREAM *plaintext_stream,
char *service,
char **argv)
{
TLSP_STATE *state;
int plaintext_fd = vstream_fileno(plaintext_stream);
/*
* Sanity check. This service takes no command-line arguments.
*/
if (argv[0])
msg_fatal("unexpected command-line argument: %s", argv[0]);
/*
* This program handles multiple connections, so it must not block. We
* use event-driven code for all operations that introduce latency.
* Except that attribute lists are sent/received synchronously, once the
* socket is found to be ready for transmission.
*/
non_blocking(plaintext_fd, NON_BLOCKING);
vstream_control(plaintext_stream,
CA_VSTREAM_CTL_PATH("plaintext"),
CA_VSTREAM_CTL_TIMEOUT(5),
CA_VSTREAM_CTL_END);
/*
* Receive postscreen's remote SMTP client address/port and socket.
*/
state = tlsp_state_create(service, plaintext_stream);
event_enable_read(plaintext_fd, tlsp_get_request_event, (void *) state);
event_request_timer(tlsp_get_request_event, (void *) state,
TLSP_INIT_TIMEOUT);
}
void smtp_timeout_setup(VSTREAM *stream, int maxtime)
{
vstream_control(stream,
VSTREAM_CTL_DOUBLE,
VSTREAM_CTL_TIMEOUT, maxtime,
VSTREAM_CTL_EXCEPT,
VSTREAM_CTL_END);
}
void timed_ipc_setup(VSTREAM *stream)
{
if (var_ipc_timeout <= 0)
msg_panic("timed_ipc_setup: bad ipc_timeout %d", var_ipc_timeout);
vstream_control(stream,
VSTREAM_CTL_TIMEOUT, var_ipc_timeout,
VSTREAM_CTL_END);
}
int vstream_tweak_tcp(VSTREAM *fp)
{
const char *myname = "vstream_tweak_tcp";
int mss;
SOCKOPT_SIZE mss_len = sizeof(mss);
int err;
/*
* Avoid Nagle delays when VSTREAM buffers are smaller than the MSS.
*
* Forcing TCP_NODELAY to be "always on" would hurt performance in the
* common case where VSTREAM buffers are larger than the MSS.
*
* Instead we ask the kernel what the current MSS is, and take appropriate
* action. Linux <= 2.2 getsockopt(TCP_MAXSEG) always returns zero (or
* whatever value was stored last with setsockopt()).
*/
if ((err = getsockopt(vstream_fileno(fp), IPPROTO_TCP, TCP_MAXSEG,
(char *) &mss, &mss_len)) < 0) {
msg_warn("%s: getsockopt TCP_MAXSEG: %m", myname);
return (err);
}
if (msg_verbose)
msg_info("%s: TCP_MAXSEG %d", myname, mss);
/*
* Fix for recent Postfix versions: increase the VSTREAM buffer size if
* the VSTREAM buffer is smaller than the MSS. Note: the MSS may change
* when the route changes and IP path MTU discovery is turned on, so we
* choose a somewhat larger buffer.
*/
#ifdef VSTREAM_CTL_BUFSIZE
if (mss > 0) {
if (mss < INT_MAX / 2)
mss *= 2;
vstream_control(fp,
VSTREAM_CTL_BUFSIZE, (ssize_t) mss,
VSTREAM_CTL_END);
}
/*
* Workaround for older Postfix versions: turn on TCP_NODELAY if the
* VSTREAM buffer size is smaller than the MSS.
*/
#else
if (mss > VSTREAM_BUFSIZE) {
int nodelay = 1;
if ((err = setsockopt(vstream_fileno(fp), IPPROTO_TCP, TCP_NODELAY,
(char *) &nodelay, sizeof(nodelay))) < 0)
msg_warn("%s: setsockopt TCP_NODELAY: %m", myname);
}
#endif
return (err);
}
static int smtpd_proxy_replay_setup(SMTPD_STATE *state)
{
const char *myname = "smtpd_proxy_replay_setup";
off_t file_offs;
/*
* Where possible reuse an existing replay logfile, because creating a
* file is expensive compared to reading or writing. For security reasons
* we must truncate the file before reuse. For performance reasons we
* should truncate the file immediately after the end of a mail
* transaction. We enforce the security guarantee upon reuse, by
* requiring that no I/O happened since the file was truncated. This is
* less expensive than truncating the file redundantly.
*/
if (smtpd_proxy_replay_stream != 0) {
/* vstream_ftell() won't invoke the kernel, so all errors are mine. */
if ((file_offs = vstream_ftell(smtpd_proxy_replay_stream)) != 0)
msg_panic("%s: bad before-queue filter speed-adjust log offset %lu",
myname, (unsigned long) file_offs);
vstream_clearerr(smtpd_proxy_replay_stream);
if (msg_verbose)
msg_info("%s: reuse speed-adjust stream fd=%d", myname,
vstream_fileno(smtpd_proxy_replay_stream));
/* Here, smtpd_proxy_replay_stream != 0 */
}
/*
* Create a new replay logfile.
*/
if (smtpd_proxy_replay_stream == 0) {
smtpd_proxy_replay_stream = mail_queue_enter(MAIL_QUEUE_INCOMING, 0,
(struct timeval *) 0);
if (smtpd_proxy_replay_stream == 0)
return (smtpd_proxy_replay_rdwr_error(state));
if (unlink(VSTREAM_PATH(smtpd_proxy_replay_stream)) < 0)
msg_warn("remove before-queue filter speed-adjust log %s: %m",
VSTREAM_PATH(smtpd_proxy_replay_stream));
if (msg_verbose)
msg_info("%s: new speed-adjust stream fd=%d", myname,
vstream_fileno(smtpd_proxy_replay_stream));
}
/*
* Needed by our DATA-phase record emulation routines.
*/
vstream_control(smtpd_proxy_replay_stream, VSTREAM_CTL_CONTEXT,
(char *) state, VSTREAM_CTL_END);
return (0);
}
static ANVIL_REMOTE *anvil_remote_conn_update(VSTREAM *client_stream, const char *ident)
{
ANVIL_REMOTE *anvil_remote;
ANVIL_LOCAL *anvil_local;
const char *myname = "anvil_remote_conn_update";
if (msg_verbose)
msg_info("%s fd=%d stream=0x%lx ident=%s",
myname, vstream_fileno(client_stream),
(unsigned long) client_stream, ident);
/*
* Look up remote connection count information. Update remote connection
* rate information. Simply reset the counter every var_anvil_time_unit
* seconds. This is easier than maintaining a moving average and it gives
* a quicker response to tresspassers.
*/
if ((anvil_remote =
(ANVIL_REMOTE *) htable_find(anvil_remote_map, ident)) == 0) {
anvil_remote = (ANVIL_REMOTE *) mymalloc(sizeof(*anvil_remote));
ANVIL_REMOTE_FIRST_CONN(anvil_remote, ident);
htable_enter(anvil_remote_map, ident, (char *) anvil_remote);
if (max_cache_size < anvil_remote_map->used) {
max_cache_size = anvil_remote_map->used;
max_cache_time = event_time();
}
} else {
ANVIL_REMOTE_NEXT_CONN(anvil_remote);
}
/*
* Record this connection under the local server information, so that we
* can clean up all its connection state when the local server goes away.
*/
if ((anvil_local = (ANVIL_LOCAL *) vstream_context(client_stream)) == 0) {
anvil_local = (ANVIL_LOCAL *) mymalloc(sizeof(*anvil_local));
ANVIL_LOCAL_INIT(anvil_local);
vstream_control(client_stream,
VSTREAM_CTL_CONTEXT, (void *) anvil_local,
VSTREAM_CTL_END);
}
ANVIL_LOCAL_ADD_ONE(anvil_local, anvil_remote);
if (msg_verbose)
msg_info("%s: anvil_local 0x%lx",
myname, (unsigned long) anvil_local);
return (anvil_remote);
}
static void multi_server_wakeup(int fd, HTABLE *attr)
{
VSTREAM *stream;
char *tmp;
#if defined(F_DUPFD) && (EVENTS_STYLE != EVENTS_STYLE_SELECT)
#ifndef THRESHOLD_FD_WORKAROUND
#define THRESHOLD_FD_WORKAROUND 128
#endif
int new_fd;
/*
* Leave some handles < FD_SETSIZE for DBMS libraries, in the unlikely
* case of a multi-server with a thousand clients.
*/
if (fd < THRESHOLD_FD_WORKAROUND) {
if ((new_fd = fcntl(fd, F_DUPFD, THRESHOLD_FD_WORKAROUND)) < 0)
msg_fatal("fcntl F_DUPFD: %m");
(void) close(fd);
fd = new_fd;
}
#endif
if (msg_verbose)
msg_info("connection established fd %d", fd);
non_blocking(fd, BLOCKING);
close_on_exec(fd, CLOSE_ON_EXEC);
client_count++;
stream = vstream_fdopen(fd, O_RDWR);
tmp = concatenate(multi_server_name, " socket", (char *) 0);
vstream_control(stream,
VSTREAM_CTL_PATH, tmp,
VSTREAM_CTL_CONTEXT, (char *) attr,
VSTREAM_CTL_END);
myfree(tmp);
timed_ipc_setup(stream);
multi_server_saved_flags = vstream_flags(stream);
if (multi_server_in_flow_delay && mail_flow_get(1) < 0)
event_request_timer(multi_server_enable_read, (char *) stream,
var_in_flow_delay);
else
multi_server_enable_read(0, (char *) stream);
}
static void single_server_wakeup(int fd, HTABLE *attr)
{
VSTREAM *stream;
char *tmp;
/*
* If the accept() succeeds, be sure to disable non-blocking I/O, because
* the application is supposed to be single-threaded. Notice the master
* of our (un)availability to service connection requests. Commit suicide
* when the master process disconnected from us. Don't drop the already
* accepted client request after "postfix reload"; that would be rude.
*/
if (msg_verbose)
msg_info("connection established");
non_blocking(fd, BLOCKING);
close_on_exec(fd, CLOSE_ON_EXEC);
stream = vstream_fdopen(fd, O_RDWR);
tmp = concatenate(single_server_name, " socket", (char *) 0);
vstream_control(stream,
CA_VSTREAM_CTL_PATH(tmp),
CA_VSTREAM_CTL_CONTEXT((void *) attr),
CA_VSTREAM_CTL_END);
myfree(tmp);
timed_ipc_setup(stream);
if (master_notify(var_pid, single_server_generation, MASTER_STAT_TAKEN) < 0)
/* void */ ;
if (single_server_in_flow_delay && mail_flow_get(1) < 0)
doze(var_in_flow_delay * 1000000);
single_server_service(stream, single_server_name, single_server_argv);
(void) vstream_fclose(stream);
if (master_notify(var_pid, single_server_generation, MASTER_STAT_AVAIL) < 0)
single_server_abort(EVENT_NULL_TYPE, EVENT_NULL_CONTEXT);
if (msg_verbose)
msg_info("connection closed");
/* Avoid integer wrap-around in a persistent process. */
if (use_count < INT_MAX)
use_count++;
if (var_idle_limit > 0)
event_request_timer(single_server_timeout, (void *) 0, var_idle_limit);
if (attr)
htable_free(attr, myfree);
}
int recv_pass_attr(int fd, HTABLE **attr, int timeout, ssize_t bufsize)
{
VSTREAM *fp;
int stream_err;
/*
* Set up a temporary VSTREAM to receive the attributes.
*
* XXX We use one-character reads to simplify the implementation.
*/
fp = vstream_fdopen(fd, O_RDWR);
vstream_control(fp,
VSTREAM_CTL_BUFSIZE, bufsize,
VSTREAM_CTL_TIMEOUT, timeout,
VSTREAM_CTL_START_DEADLINE,
VSTREAM_CTL_END);
(void) attr_scan(fp, ATTR_FLAG_NONE,
ATTR_TYPE_HASH, *attr = htable_create(1),
ATTR_TYPE_END);
stream_err = (vstream_feof(fp) || vstream_ferror(fp));
vstream_fdclose(fp);
/*
* Error reporting and recovery.
*/
if (stream_err) {
htable_free(*attr, myfree);
*attr = 0;
return (-1);
} else {
if ((*attr)->used == 0) {
htable_free(*attr, myfree);
*attr = 0;
}
return (0);
}
}
static int xsasl_dovecot_server_connect(XSASL_DOVECOT_SERVER_IMPL *xp)
{
const char *myname = "xsasl_dovecot_server_connect";
VSTRING *line_str;
VSTREAM *sasl_stream;
char *line, *cmd, *mech_name;
unsigned int major_version, minor_version;
int fd, success, have_mech_line;
int sec_props;
const char *path;
if (msg_verbose)
msg_info("%s: Connecting", myname);
/*
* Not documented, but necessary for testing.
*/
path = xp->socket_path;
if (strncmp(path, "inet:", 5) == 0) {
fd = inet_connect(path + 5, BLOCKING, AUTH_TIMEOUT);
} else {
if (strncmp(path, "unix:", 5) == 0)
path += 5;
fd = unix_connect(path, BLOCKING, AUTH_TIMEOUT);
}
if (fd < 0) {
msg_warn("SASL: Connect to %s failed: %m", xp->socket_path);
return (-1);
}
sasl_stream = vstream_fdopen(fd, O_RDWR);
vstream_control(sasl_stream,
CA_VSTREAM_CTL_PATH(xp->socket_path),
CA_VSTREAM_CTL_TIMEOUT(AUTH_TIMEOUT),
CA_VSTREAM_CTL_END);
/* XXX Encapsulate for logging. */
vstream_fprintf(sasl_stream,
"VERSION\t%u\t%u\n"
"CPID\t%u\n",
AUTH_PROTOCOL_MAJOR_VERSION,
AUTH_PROTOCOL_MINOR_VERSION,
(unsigned int) getpid());
if (vstream_fflush(sasl_stream) == VSTREAM_EOF) {
msg_warn("SASL: Couldn't send handshake: %m");
return (-1);
}
success = 0;
have_mech_line = 0;
line_str = vstring_alloc(256);
/* XXX Encapsulate for logging. */
while (vstring_get_nonl(line_str, sasl_stream) != VSTREAM_EOF) {
line = vstring_str(line_str);
if (msg_verbose)
msg_info("%s: auth reply: %s", myname, line);
cmd = line;
line = split_at(line, '\t');
if (strcmp(cmd, "VERSION") == 0) {
if (sscanf(line, "%u\t%u", &major_version, &minor_version) != 2) {
msg_warn("SASL: Protocol version error");
break;
}
if (major_version != AUTH_PROTOCOL_MAJOR_VERSION) {
/* Major version is different from ours. */
msg_warn("SASL: Protocol version mismatch (%d vs. %d)",
major_version, AUTH_PROTOCOL_MAJOR_VERSION);
break;
}
} else if (strcmp(cmd, "MECH") == 0 && line != NULL) {
mech_name = line;
have_mech_line = 1;
line = split_at(line, '\t');
if (line != 0) {
sec_props =
name_mask_delim_opt(myname,
xsasl_dovecot_serv_sec_props,
line, "\t",
NAME_MASK_ANY_CASE | NAME_MASK_IGNORE);
if ((sec_props & SEC_PROPS_PRIVATE) != 0)
continue;
} else
sec_props = 0;
xsasl_dovecot_server_mech_append(&xp->mechanism_list, mech_name,
sec_props);
} else if (strcmp(cmd, "SPID") == 0) {
/*
* Unfortunately the auth protocol handshake wasn't designed well
* to differentiate between auth-client/userdb/master.
* auth-userdb and auth-master send VERSION + SPID lines only and
* nothing afterwards, while auth-client sends VERSION + MECH +
* SPID + CUID + more. The simplest way that we can determine if
* we've connected to the correct socket is to see if MECH line
* exists or not (alternatively we'd have to have a small timeout
* after SPID to see if CUID is sent or not).
*/
if (!have_mech_line) {
msg_warn("SASL: Connected to wrong auth socket (auth-master instead of auth-client)");
break;
}
} else if (strcmp(cmd, "DONE") == 0) {
/* Handshake finished. */
success = 1;
break;
} else {
/* ignore any unknown commands */
}
}
vstring_free(line_str);
if (!success) {
/* handshake failed */
(void) vstream_fclose(sasl_stream);
return (-1);
}
xp->sasl_stream = sasl_stream;
return (0);
}
int vstream_tweak_tcp(VSTREAM *fp)
{
const char *myname = "vstream_tweak_tcp";
int mss = 0;
SOCKOPT_SIZE mss_len = sizeof(mss);
int err;
/*
* Avoid Nagle delays when VSTREAM buffers are smaller than the MSS.
*
* Forcing TCP_NODELAY to be "always on" would hurt performance in the
* common case where VSTREAM buffers are larger than the MSS.
*
* Instead we ask the kernel what the current MSS is, and take appropriate
* action. Linux <= 2.2 getsockopt(TCP_MAXSEG) always returns zero (or
* whatever value was stored last with setsockopt()).
*
* Some ancient FreeBSD kernels don't report 'host unreachable' errors with
* getsockopt(SO_ERROR), and then treat getsockopt(TCP_MAXSEG) as a NOOP,
* leaving the mss parameter value unchanged. To work around these two
* getsockopt() bugs we set mss = 0, which is a harmless value.
*/
if ((err = getsockopt(vstream_fileno(fp), IPPROTO_TCP, TCP_MAXSEG,
(char *) &mss, &mss_len)) < 0
&& errno != ECONNRESET) {
msg_warn("%s: getsockopt TCP_MAXSEG: %m", myname);
return (err);
}
if (msg_verbose)
msg_info("%s: TCP_MAXSEG %d", myname, mss);
/*
* Fix for recent Postfix versions: increase the VSTREAM buffer size if
* it is smaller than the MSS. Note: the MSS may change when the route
* changes and IP path MTU discovery is turned on, so we choose a
* somewhat larger buffer.
*
* Note: as of 20120527, the VSTREAM_CTL_BUFSIZE request can reduce the
* stream buffer size to less than VSTREAM_BUFSIZE, when the request is
* made before the first stream read or write operation. We don't want to
* reduce the buffer size.
*/
#define EFF_BUFFER_SIZE(fp) (vstream_req_bufsize(fp) ? \
vstream_req_bufsize(fp) : VSTREAM_BUFSIZE)
#ifdef VSTREAM_CTL_BUFSIZE
if (mss > EFF_BUFFER_SIZE(fp) / 2) {
if (mss < INT_MAX / 2)
mss *= 2;
vstream_control(fp,
VSTREAM_CTL_BUFSIZE, (ssize_t) mss,
VSTREAM_CTL_END);
}
/*
* Workaround for older Postfix versions: turn on TCP_NODELAY if the
* VSTREAM buffer size is smaller than the MSS.
*/
#else
if (mss > VSTREAM_BUFSIZE) {
int nodelay = 1;
if ((err = setsockopt(vstream_fileno(fp), IPPROTO_TCP, TCP_NODELAY,
(char *) &nodelay, sizeof(nodelay))) < 0
&& errno != ECONNRESET)
msg_warn("%s: setsockopt TCP_NODELAY: %m", myname);
}
#endif
return (err);
}
int psc_dnsbl_request(const char *client_addr,
void (*callback) (int, void *),
void *context)
{
const char *myname = "psc_dnsbl_request";
int fd;
VSTREAM *stream;
HTABLE_INFO **ht;
PSC_DNSBL_SCORE *score;
HTABLE_INFO *hash_node;
static int request_count;
/*
* Some spambots make several connections at nearly the same time,
* causing their pregreet delays to overlap. Such connections can share
* the efforts of DNSBL lookup.
*
* We store a reference-counted DNSBL score under its client IP address. We
* increment the reference count with each score request, and decrement
* the reference count with each score retrieval.
*
* Do not notify the requestor NOW when the DNS replies are already in.
* Reason: we must not make a backwards call while we are still in the
* middle of executing the corresponding forward call. Instead we create
* a zero-delay timer request and call the notification function from
* there.
*
* psc_dnsbl_request() could instead return a result value to indicate that
* the DNSBL score is already available, but that would complicate the
* caller with two different notification code paths: one asynchronous
* code path via the callback invocation, and one synchronous code path
* via the psc_dnsbl_request() result value. That would be a source of
* future bugs.
*/
if ((hash_node = htable_locate(dnsbl_score_cache, client_addr)) != 0) {
score = (PSC_DNSBL_SCORE *) hash_node->value;
score->refcount += 1;
PSC_CALL_BACK_EXTEND(hash_node, score);
PSC_CALL_BACK_ENTER(score, callback, context);
if (msg_verbose > 1)
msg_info("%s: reuse blocklist score for %s refcount=%d pending=%d",
myname, client_addr, score->refcount,
score->pending_lookups);
if (score->pending_lookups == 0)
event_request_timer(callback, context, EVENT_NULL_DELAY);
return (PSC_CALL_BACK_INDEX_OF_LAST(score));
}
if (msg_verbose > 1)
msg_info("%s: create blocklist score for %s", myname, client_addr);
score = (PSC_DNSBL_SCORE *) mymalloc(sizeof(*score));
score->request_id = request_count++;
score->dnsbl_name = 0;
score->dnsbl_weight = 0;
/* As with dnsblog(8), a value < 0 means no reply TTL. */
score->pass_ttl = -1;
score->fail_ttl = -1;
score->total = 0;
score->refcount = 1;
score->pending_lookups = 0;
PSC_CALL_BACK_INIT(score);
PSC_CALL_BACK_ENTER(score, callback, context);
(void) htable_enter(dnsbl_score_cache, client_addr, (void *) score);
/*
* Send a query to all DNSBL servers. Later, DNSBL lookup will be done
* with an UDP-based DNS client that is built directly into Postfix code.
* We therefore do not optimize the maximum out of this temporary
* implementation.
*/
for (ht = dnsbl_site_list; *ht; ht++) {
if ((fd = LOCAL_CONNECT(psc_dnsbl_service, NON_BLOCKING, 1)) < 0) {
msg_warn("%s: connect to %s service: %m",
myname, psc_dnsbl_service);
continue;
}
stream = vstream_fdopen(fd, O_RDWR);
vstream_control(stream,
CA_VSTREAM_CTL_CONTEXT(ht[0]->key),
CA_VSTREAM_CTL_END);
attr_print(stream, ATTR_FLAG_NONE,
SEND_ATTR_STR(MAIL_ATTR_RBL_DOMAIN, ht[0]->key),
SEND_ATTR_STR(MAIL_ATTR_ACT_CLIENT_ADDR, client_addr),
SEND_ATTR_INT(MAIL_ATTR_LABEL, score->request_id),
ATTR_TYPE_END);
if (vstream_fflush(stream) != 0) {
msg_warn("%s: error sending to %s service: %m",
myname, psc_dnsbl_service);
vstream_fclose(stream);
continue;
}
PSC_READ_EVENT_REQUEST(vstream_fileno(stream), psc_dnsbl_receive,
(void *) stream, var_psc_dnsbl_tmout);
score->pending_lookups += 1;
}
return (PSC_CALL_BACK_INDEX_OF_LAST(score));
}
int main(int argc, char **argv)
{
VSTRING *buffer;
VSTREAM *fp;
int ch;
int fd;
struct stat st;
int flags = 0;
static char *queue_names[] = {
MAIL_QUEUE_MAILDROP,
MAIL_QUEUE_INCOMING,
MAIL_QUEUE_ACTIVE,
MAIL_QUEUE_DEFERRED,
MAIL_QUEUE_HOLD,
MAIL_QUEUE_SAVED,
0,
};
char **cpp;
int tries;
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* To minimize confusion, make sure that the standard file descriptors
* are open before opening anything else. XXX Work around for 44BSD where
* fstat can return EBADF on an open file descriptor.
*/
for (fd = 0; fd < 3; fd++)
if (fstat(fd, &st) == -1
&& (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
msg_fatal("open /dev/null: %m");
/*
* Set up logging.
*/
msg_vstream_init(argv[0], VSTREAM_ERR);
/*
* Parse JCL.
*/
while ((ch = GETOPT(argc, argv, "bc:dehoqv")) > 0) {
switch (ch) {
case 'b':
flags |= PC_FLAG_PRINT_BODY;
break;
case 'c':
if (setenv(CONF_ENV_PATH, optarg, 1) < 0)
msg_fatal("out of memory");
break;
case 'd':
flags |= PC_FLAG_PRINT_RTYPE_DEC;
break;
case 'e':
flags |= PC_FLAG_PRINT_ENV;
break;
case 'h':
flags |= PC_FLAG_PRINT_HEADER;
break;
case 'o':
flags |= PC_FLAG_PRINT_OFFSET;
break;
case 'q':
flags |= PC_FLAG_SEARCH_QUEUE;
break;
case 'v':
msg_verbose++;
break;
default:
usage(argv[0]);
}
}
if ((flags & PC_MASK_PRINT_ALL) == 0)
flags |= PC_MASK_PRINT_ALL;
/*
* Further initialization...
*/
mail_conf_read();
/*
* Initialize.
*/
buffer = vstring_alloc(10);
/*
* If no file names are given, copy stdin.
*/
if (argc == optind) {
vstream_control(VSTREAM_IN,
VSTREAM_CTL_PATH, "stdin",
VSTREAM_CTL_END);
postcat(VSTREAM_IN, buffer, flags);
}
/*
* Copy the named queue files in the specified order.
*/
else if (flags & PC_FLAG_SEARCH_QUEUE) {
if (chdir(var_queue_dir))
msg_fatal("chdir %s: %m", var_queue_dir);
while (optind < argc) {
if (!mail_queue_id_ok(argv[optind]))
msg_fatal("bad mail queue ID: %s", argv[optind]);
for (fp = 0, tries = 0; fp == 0 && tries < 2; tries++)
for (cpp = queue_names; fp == 0 && *cpp != 0; cpp++)
fp = mail_queue_open(*cpp, argv[optind], O_RDONLY, 0);
if (fp == 0)
msg_fatal("open queue file %s: %m", argv[optind]);
postcat(fp, buffer, flags);
if (vstream_fclose(fp))
msg_warn("close %s: %m", argv[optind]);
optind++;
}
}
/*
* Copy the named files in the specified order.
*/
else {
while (optind < argc) {
if ((fp = vstream_fopen(argv[optind], O_RDONLY, 0)) == 0)
msg_fatal("open %s: %m", argv[optind]);
postcat(fp, buffer, flags);
if (vstream_fclose(fp))
msg_warn("close %s: %m", argv[optind]);
optind++;
}
}
/*
* Clean up.
*/
vstring_free(buffer);
exit(0);
}
void qmgr_transport_alloc(QMGR_TRANSPORT *transport, QMGR_TRANSPORT_ALLOC_NOTIFY notify)
{
QMGR_TRANSPORT_ALLOC *alloc;
/*
* Sanity checks.
*/
if (transport->flags & QMGR_TRANSPORT_STAT_DEAD)
msg_panic("qmgr_transport: dead transport: %s", transport->name);
if (transport->flags & QMGR_TRANSPORT_STAT_RATE_LOCK)
msg_panic("qmgr_transport: rate-locked transport: %s", transport->name);
if (transport->pending >= QMGR_TRANSPORT_MAX_PEND)
msg_panic("qmgr_transport: excess allocation: %s", transport->name);
/*
* When this message delivery transport is rate-limited, do not select it
* again before the end of a message delivery transaction.
*/
if (transport->xport_rate_delay > 0)
transport->flags |= QMGR_TRANSPORT_STAT_RATE_LOCK;
/*
* Connect to the well-known port for this delivery service, and wake up
* when a process announces its availability. Allow only a limited number
* of delivery process allocation attempts for this transport. In case of
* problems, back off. Do not hose the system when it is in trouble
* already.
*
* Use non-blocking connect(), so that Linux won't block the queue manager
* until the delivery agent calls accept().
*
* When the connection to delivery agent cannot be completed, notify the
* event handler so that it can throttle the transport and defer the todo
* queues, just like it does when communication fails *after* connection
* completion.
*
* Before Postfix 2.4, the event handler was not invoked after connect()
* error, and mail was not deferred. Because of this, mail would be stuck
* in the active queue after triggering a "connection refused" condition.
*/
alloc = (QMGR_TRANSPORT_ALLOC *) mymalloc(sizeof(*alloc));
alloc->transport = transport;
alloc->notify = notify;
transport->pending += 1;
if ((alloc->stream = mail_connect(MAIL_CLASS_PRIVATE, transport->name,
NON_BLOCKING)) == 0) {
msg_warn("connect to transport %s/%s: %m",
MAIL_CLASS_PRIVATE, transport->name);
event_request_timer(qmgr_transport_event, (void *) alloc, 0);
return;
}
#if (EVENTS_STYLE != EVENTS_STYLE_SELECT) && defined(CA_VSTREAM_CTL_DUPFD)
#ifndef THRESHOLD_FD_WORKAROUND
#define THRESHOLD_FD_WORKAROUND 128
#endif
vstream_control(alloc->stream,
CA_VSTREAM_CTL_DUPFD(THRESHOLD_FD_WORKAROUND),
CA_VSTREAM_CTL_END);
#endif
event_enable_read(vstream_fileno(alloc->stream), qmgr_transport_event,
(void *) alloc);
/*
* Guard against broken systems.
*/
event_request_timer(qmgr_transport_abort, (void *) alloc,
var_daemon_timeout);
}
static void postalias(char *map_type, char *path_name, int postalias_flags,
int open_flags, int dict_flags)
{
VSTREAM *NOCLOBBER source_fp;
VSTRING *line_buffer;
MKMAP *mkmap;
int lineno;
int last_line;
VSTRING *key_buffer;
VSTRING *value_buffer;
TOK822 *tok_list;
TOK822 *key_list;
TOK822 *colon;
TOK822 *value_list;
struct stat st;
mode_t saved_mask;
/*
* Initialize.
*/
line_buffer = vstring_alloc(100);
key_buffer = vstring_alloc(100);
value_buffer = vstring_alloc(100);
if ((open_flags & O_TRUNC) == 0) {
/* Incremental mode. */
source_fp = VSTREAM_IN;
vstream_control(source_fp, CA_VSTREAM_CTL_PATH("stdin"), CA_VSTREAM_CTL_END);
} else {
/* Create database. */
if (strcmp(map_type, DICT_TYPE_PROXY) == 0)
msg_fatal("can't create maps via the proxy service");
dict_flags |= DICT_FLAG_BULK_UPDATE;
if ((source_fp = vstream_fopen(path_name, O_RDONLY, 0)) == 0)
msg_fatal("open %s: %m", path_name);
}
if (fstat(vstream_fileno(source_fp), &st) < 0)
msg_fatal("fstat %s: %m", path_name);
/*
* Turn off group/other read permissions as indicated in the source file.
*/
if ((postalias_flags & POSTALIAS_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
saved_mask = umask(022 | (~st.st_mode & 077));
/*
* If running as root, run as the owner of the source file, so that the
* result shows proper ownership, and so that a bug in postalias does not
* allow privilege escalation.
*/
if ((postalias_flags & POSTALIAS_FLAG_AS_OWNER) && getuid() == 0
&& (st.st_uid != geteuid() || st.st_gid != getegid()))
set_eugid(st.st_uid, st.st_gid);
/*
* Open the database, create it when it does not exist, truncate it when
* it does exist, and lock out any spectators.
*/
mkmap = mkmap_open(map_type, path_name, open_flags, dict_flags);
/*
* And restore the umask, in case it matters.
*/
if ((postalias_flags & POSTALIAS_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
umask(saved_mask);
/*
* Trap "exceptions" so that we can restart a bulk-mode update after a
* recoverable error.
*/
for (;;) {
if (dict_isjmp(mkmap->dict) != 0
&& dict_setjmp(mkmap->dict) != 0
&& vstream_fseek(source_fp, SEEK_SET, 0) < 0)
msg_fatal("seek %s: %m", VSTREAM_PATH(source_fp));
/*
* Add records to the database.
*/
last_line = 0;
while (readllines(line_buffer, source_fp, &last_line, &lineno)) {
/*
* First some UTF-8 checks sans casefolding.
*/
if ((mkmap->dict->flags & DICT_FLAG_UTF8_ACTIVE)
&& !allascii(STR(line_buffer))
&& !valid_utf8_string(STR(line_buffer), LEN(line_buffer))) {
msg_warn("%s, line %d: non-UTF-8 input \"%s\""
" -- ignoring this line",
VSTREAM_PATH(source_fp), lineno, STR(line_buffer));
continue;
}
/*
* Tokenize the input, so that we do the right thing when a
* quoted localpart contains special characters such as "@", ":"
* and so on.
*/
if ((tok_list = tok822_scan(STR(line_buffer), (TOK822 **) 0)) == 0)
continue;
/*
* Enforce the key:value format. Disallow missing keys,
* multi-address keys, or missing values. In order to specify an
* empty string or value, enclose it in double quotes.
*/
if ((colon = tok822_find_type(tok_list, ':')) == 0
|| colon->prev == 0 || colon->next == 0
|| tok822_rfind_type(colon, ',')) {
msg_warn("%s, line %d: need name:value pair",
VSTREAM_PATH(source_fp), lineno);
tok822_free_tree(tok_list);
continue;
}
/*
* Key must be local. XXX We should use the Postfix rewriting and
* resolving services to handle all address forms correctly.
* However, we can't count on the mail system being up when the
* alias database is being built, so we're guessing a bit.
*/
if (tok822_rfind_type(colon, '@') || tok822_rfind_type(colon, '%')) {
msg_warn("%s, line %d: name must be local",
VSTREAM_PATH(source_fp), lineno);
tok822_free_tree(tok_list);
continue;
}
/*
* Split the input into key and value parts, and convert from
* token representation back to string representation. Convert
* the key to internal (unquoted) form, because the resolver
* produces addresses in internal form. Convert the value to
* external (quoted) form, because it will have to be re-parsed
* upon lookup. Discard the token representation when done.
*/
key_list = tok_list;
tok_list = 0;
value_list = tok822_cut_after(colon);
tok822_unlink(colon);
tok822_free(colon);
tok822_internalize(key_buffer, key_list, TOK822_STR_DEFL);
tok822_free_tree(key_list);
tok822_externalize(value_buffer, value_list, TOK822_STR_DEFL);
tok822_free_tree(value_list);
/*
* Store the value under a case-insensitive key.
*/
mkmap_append(mkmap, STR(key_buffer), STR(value_buffer));
if (mkmap->dict->error)
msg_fatal("table %s:%s: write error: %m",
mkmap->dict->type, mkmap->dict->name);
}
break;
}
/*
* Update or append sendmail and NIS signatures.
*/
if ((open_flags & O_TRUNC) == 0)
mkmap->dict->flags |= DICT_FLAG_DUP_REPLACE;
/*
* Sendmail compatibility: add the @:@ signature to indicate that the
* database is complete. This might be needed by NIS clients running
* sendmail.
*/
mkmap_append(mkmap, "@", "@");
if (mkmap->dict->error)
msg_fatal("table %s:%s: write error: %m",
mkmap->dict->type, mkmap->dict->name);
/*
* NIS compatibility: add time and master info. Unlike other information,
* this information MUST be written without a trailing null appended to
* key or value.
*/
mkmap->dict->flags &= ~DICT_FLAG_TRY1NULL;
mkmap->dict->flags |= DICT_FLAG_TRY0NULL;
vstring_sprintf(value_buffer, "%010ld", (long) time((time_t *) 0));
#if (defined(HAS_NIS) || defined(HAS_NISPLUS))
mkmap->dict->flags &= ~DICT_FLAG_FOLD_FIX;
mkmap_append(mkmap, "YP_LAST_MODIFIED", STR(value_buffer));
mkmap_append(mkmap, "YP_MASTER_NAME", var_myhostname);
#endif
/*
* Close the alias database, and release the lock.
*/
mkmap_close(mkmap);
/*
* Cleanup. We're about to terminate, but it is a good sanity check.
*/
vstring_free(value_buffer);
vstring_free(key_buffer);
vstring_free(line_buffer);
if (source_fp != VSTREAM_IN)
vstream_fclose(source_fp);
}
static void postmap(char *map_type, char *path_name, int postmap_flags,
int open_flags, int dict_flags)
{
VSTREAM *source_fp;
VSTRING *line_buffer;
MKMAP *mkmap;
int lineno;
char *key;
char *value;
struct stat st;
mode_t saved_mask;
/*
* Initialize.
*/
line_buffer = vstring_alloc(100);
if ((open_flags & O_TRUNC) == 0) {
source_fp = VSTREAM_IN;
vstream_control(source_fp, VSTREAM_CTL_PATH, "stdin", VSTREAM_CTL_END);
} else if (strcmp(map_type, DICT_TYPE_PROXY) == 0) {
msg_fatal("can't create maps via the proxy service");
} else if ((source_fp = vstream_fopen(path_name, O_RDONLY, 0)) == 0) {
msg_fatal("open %s: %m", path_name);
}
if (fstat(vstream_fileno(source_fp), &st) < 0)
msg_fatal("fstat %s: %m", path_name);
/*
* Turn off group/other read permissions as indicated in the source file.
*/
if ((postmap_flags & POSTMAP_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
saved_mask = umask(022 | (~st.st_mode & 077));
/*
* If running as root, run as the owner of the source file, so that the
* result shows proper ownership, and so that a bug in postmap does not
* allow privilege escalation.
*/
if ((postmap_flags & POSTMAP_FLAG_AS_OWNER) && getuid() == 0
&& (st.st_uid != geteuid() || st.st_gid != getegid()))
set_eugid(st.st_uid, st.st_gid);
/*
* Open the database, optionally create it when it does not exist,
* optionally truncate it when it does exist, and lock out any
* spectators.
*/
mkmap = mkmap_open(map_type, path_name, open_flags, dict_flags);
/*
* And restore the umask, in case it matters.
*/
if ((postmap_flags & POSTMAP_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
umask(saved_mask);
/*
* Add records to the database.
*/
lineno = 0;
while (readlline(line_buffer, source_fp, &lineno)) {
/*
* Split on the first whitespace character, then trim leading and
* trailing whitespace from key and value.
*/
key = STR(line_buffer);
value = key + strcspn(key, " \t\r\n");
if (*value)
*value++ = 0;
while (ISSPACE(*value))
value++;
trimblanks(key, 0)[0] = 0;
trimblanks(value, 0)[0] = 0;
/*
* Enforce the "key whitespace value" format. Disallow missing keys
* or missing values.
*/
if (*key == 0 || *value == 0) {
msg_warn("%s, line %d: expected format: key whitespace value",
VSTREAM_PATH(source_fp), lineno);
continue;
}
if (key[strlen(key) - 1] == ':')
msg_warn("%s, line %d: record is in \"key: value\" format; is this an alias file?",
VSTREAM_PATH(source_fp), lineno);
/*
* Store the value under a case-insensitive key.
*/
mkmap_append(mkmap, key, value);
if (mkmap->dict->error)
msg_fatal("table %s:%s: write error: %m",
mkmap->dict->type, mkmap->dict->name);
}
/*
* Close the mapping database, and release the lock.
*/
mkmap_close(mkmap);
/*
* Cleanup. We're about to terminate, but it is a good sanity check.
*/
vstring_free(line_buffer);
if (source_fp != VSTREAM_IN)
vstream_fclose(source_fp);
}
int main(int argc, char **argv)
{
struct stat st;
int fd;
int c;
VSTRING *buf;
int status;
MAIL_STREAM *dst;
int rec_type;
static char *segment_info[] = {
REC_TYPE_POST_ENVELOPE, REC_TYPE_POST_CONTENT, REC_TYPE_POST_EXTRACT, ""
};
char **expected;
uid_t uid = getuid();
ARGV *import_env;
const char *error_text;
char *attr_name;
char *attr_value;
const char *errstr;
char *junk;
struct timeval start;
int saved_errno;
int from_count = 0;
int rcpt_count = 0;
int validate_input = 1;
/*
* Fingerprint executables and core dumps.
*/
MAIL_VERSION_STAMP_ALLOCATE;
/*
* Be consistent with file permissions.
*/
umask(022);
/*
* To minimize confusion, make sure that the standard file descriptors
* are open before opening anything else. XXX Work around for 44BSD where
* fstat can return EBADF on an open file descriptor.
*/
for (fd = 0; fd < 3; fd++)
if (fstat(fd, &st) == -1
&& (close(fd), open("/dev/null", O_RDWR, 0)) != fd)
msg_fatal("open /dev/null: %m");
/*
* Set up logging. Censor the process name: it is provided by the user.
*/
argv[0] = "postdrop";
msg_vstream_init(argv[0], VSTREAM_ERR);
msg_syslog_init(mail_task("postdrop"), LOG_PID, LOG_FACILITY);
set_mail_conf_str(VAR_PROCNAME, var_procname = mystrdup(argv[0]));
/*
* Check the Postfix library version as soon as we enable logging.
*/
MAIL_VERSION_CHECK;
/*
* Parse JCL. This program is set-gid and must sanitize all command-line
* arguments. The configuration directory argument is validated by the
* mail configuration read routine. Don't do complex things until we have
* completed initializations.
*/
while ((c = GETOPT(argc, argv, "c:rv")) > 0) {
switch (c) {
case 'c':
if (setenv(CONF_ENV_PATH, optarg, 1) < 0)
msg_fatal("out of memory");
break;
case 'r': /* forward compatibility */
break;
case 'v':
if (geteuid() == 0)
msg_verbose++;
break;
default:
msg_fatal("usage: %s [-c config_dir] [-v]", argv[0]);
}
}
/*
* Read the global configuration file and extract configuration
* information. Some claim that the user should supply the working
* directory instead. That might be OK, given that this command needs
* write permission in a subdirectory called "maildrop". However we still
* need to reliably detect incomplete input, and so we must perform
* record-level I/O. With that, we should also take the opportunity to
* perform some sanity checks on the input.
*/
mail_conf_read();
/* Re-evaluate mail_task() after reading main.cf. */
msg_syslog_init(mail_task("postdrop"), LOG_PID, LOG_FACILITY);
get_mail_conf_str_table(str_table);
/*
* Mail submission access control. Should this be in the user-land gate,
* or in the daemon process?
*/
mail_dict_init();
if ((errstr = check_user_acl_byuid(VAR_SUBMIT_ACL, var_submit_acl,
uid)) != 0)
msg_fatal("User %s(%ld) is not allowed to submit mail",
errstr, (long) uid);
/*
* Stop run-away process accidents by limiting the queue file size. This
* is not a defense against DOS attack.
*/
if (var_message_limit > 0 && get_file_limit() > var_message_limit)
set_file_limit((off_t) var_message_limit);
/*
* This program is installed with setgid privileges. Strip the process
* environment so that we don't have to trust the C library.
*/
import_env = mail_parm_split(VAR_IMPORT_ENVIRON, var_import_environ);
clean_env(import_env->argv);
argv_free(import_env);
if (chdir(var_queue_dir))
msg_fatal("chdir %s: %m", var_queue_dir);
if (msg_verbose)
msg_info("chdir %s", var_queue_dir);
/*
* Set up signal handlers and a runtime error handler so that we can
* clean up incomplete output.
*
* postdrop_sig() uses the in-kernel SIGINT handler address as an atomic
* variable to prevent nested postdrop_sig() calls. For this reason, the
* SIGINT handler must be configured before other signal handlers are
* allowed to invoke postdrop_sig().
*/
signal(SIGPIPE, SIG_IGN);
signal(SIGXFSZ, SIG_IGN);
signal(SIGINT, postdrop_sig);
signal(SIGQUIT, postdrop_sig);
if (signal(SIGTERM, SIG_IGN) == SIG_DFL)
signal(SIGTERM, postdrop_sig);
if (signal(SIGHUP, SIG_IGN) == SIG_DFL)
signal(SIGHUP, postdrop_sig);
msg_cleanup(postdrop_cleanup);
/* End of initializations. */
/*
* Don't trust the caller's time information.
*/
GETTIMEOFDAY(&start);
/*
* Create queue file. mail_stream_file() never fails. Send the queue ID
* to the caller. Stash away a copy of the queue file name so we can
* clean up in case of a fatal error or an interrupt.
*/
dst = mail_stream_file(MAIL_QUEUE_MAILDROP, MAIL_CLASS_PUBLIC,
var_pickup_service, 0444);
attr_print(VSTREAM_OUT, ATTR_FLAG_NONE,
SEND_ATTR_STR(MAIL_ATTR_QUEUEID, dst->id),
ATTR_TYPE_END);
vstream_fflush(VSTREAM_OUT);
postdrop_path = mystrdup(VSTREAM_PATH(dst->stream));
/*
* Copy stdin to file. The format is checked so that we can recognize
* incomplete input and cancel the operation. With the sanity checks
* applied here, the pickup daemon could skip format checks and pass a
* file descriptor to the cleanup daemon. These are by no means all
* sanity checks - the cleanup service and queue manager services will
* reject messages that lack required information.
*
* If something goes wrong, slurp up the input before responding to the
* client, otherwise the client will give up after detecting SIGPIPE.
*
* Allow attribute records if the attribute specifies the MIME body type
* (sendmail -B).
*/
vstream_control(VSTREAM_IN, CA_VSTREAM_CTL_PATH("stdin"), CA_VSTREAM_CTL_END);
buf = vstring_alloc(100);
expected = segment_info;
/* Override time information from the untrusted caller. */
rec_fprintf(dst->stream, REC_TYPE_TIME, REC_TYPE_TIME_FORMAT,
REC_TYPE_TIME_ARG(start));
for (;;) {
/* Don't allow PTR records. */
rec_type = rec_get_raw(VSTREAM_IN, buf, var_line_limit, REC_FLAG_NONE);
if (rec_type == REC_TYPE_EOF) { /* request cancelled */
mail_stream_cleanup(dst);
if (remove(postdrop_path))
msg_warn("uid=%ld: remove %s: %m", (long) uid, postdrop_path);
else if (msg_verbose)
msg_info("remove %s", postdrop_path);
myfree(postdrop_path);
postdrop_path = 0;
exit(0);
}
if (rec_type == REC_TYPE_ERROR)
msg_fatal("uid=%ld: malformed input", (long) uid);
if (strchr(*expected, rec_type) == 0)
msg_fatal("uid=%ld: unexpected record type: %d", (long) uid, rec_type);
if (rec_type == **expected)
expected++;
/* Override time information from the untrusted caller. */
if (rec_type == REC_TYPE_TIME)
continue;
/* Check these at submission time instead of pickup time. */
if (rec_type == REC_TYPE_FROM)
from_count++;
if (rec_type == REC_TYPE_RCPT)
rcpt_count++;
/* Limit the attribute types that users may specify. */
if (rec_type == REC_TYPE_ATTR) {
if ((error_text = split_nameval(vstring_str(buf), &attr_name,
&attr_value)) != 0) {
msg_warn("uid=%ld: ignoring malformed record: %s: %.200s",
(long) uid, error_text, vstring_str(buf));
continue;
}
#define STREQ(x,y) (strcmp(x,y) == 0)
if ((STREQ(attr_name, MAIL_ATTR_ENCODING)
&& (STREQ(attr_value, MAIL_ATTR_ENC_7BIT)
|| STREQ(attr_value, MAIL_ATTR_ENC_8BIT)
|| STREQ(attr_value, MAIL_ATTR_ENC_NONE)))
|| STREQ(attr_name, MAIL_ATTR_DSN_ENVID)
|| STREQ(attr_name, MAIL_ATTR_DSN_NOTIFY)
|| rec_attr_map(attr_name)
|| (STREQ(attr_name, MAIL_ATTR_RWR_CONTEXT)
&& (STREQ(attr_value, MAIL_ATTR_RWR_LOCAL)
|| STREQ(attr_value, MAIL_ATTR_RWR_REMOTE)))
|| STREQ(attr_name, MAIL_ATTR_TRACE_FLAGS)) { /* XXX */
rec_fprintf(dst->stream, REC_TYPE_ATTR, "%s=%s",
attr_name, attr_value);
} else {
msg_warn("uid=%ld: ignoring attribute record: %.200s=%.200s",
(long) uid, attr_name, attr_value);
}
continue;
}
if (REC_PUT_BUF(dst->stream, rec_type, buf) < 0) {
/* rec_get() errors must not clobber errno. */
saved_errno = errno;
while ((rec_type = rec_get_raw(VSTREAM_IN, buf, var_line_limit,
REC_FLAG_NONE)) != REC_TYPE_END
&& rec_type != REC_TYPE_EOF)
if (rec_type == REC_TYPE_ERROR)
msg_fatal("uid=%ld: malformed input", (long) uid);
validate_input = 0;
errno = saved_errno;
break;
}
if (rec_type == REC_TYPE_END)
break;
}
vstring_free(buf);
/*
* As of Postfix 2.7 the pickup daemon discards mail without recipients.
* Such mail may enter the maildrop queue when "postsuper -r" is invoked
* before the queue manager deletes an already delivered message. Looking
* at file ownership is not a good way to make decisions on what mail to
* discard. Instead, the pickup server now requires that new submissions
* always have at least one recipient record.
*
* The Postfix sendmail command already rejects mail without recipients.
* However, in the future postdrop may receive mail via other programs,
* so we add a redundant recipient check here for future proofing.
*
* The test for the sender address is just for consistency of error
* reporting (report at submission time instead of pickup time). Besides
* the segment terminator records, there aren't any other mandatory
* records in a Postfix submission queue file.
*/
if (validate_input && (from_count == 0 || rcpt_count == 0)) {
status = CLEANUP_STAT_BAD;
mail_stream_cleanup(dst);
}
/*
* Finish the file.
*/
else if ((status = mail_stream_finish(dst, (VSTRING *) 0)) != 0) {
msg_warn("uid=%ld: %m", (long) uid);
postdrop_cleanup();
}
/*
* Disable deletion on fatal error before reporting success, so the file
* will not be deleted after we have taken responsibility for delivery.
*/
if (postdrop_path) {
junk = postdrop_path;
postdrop_path = 0;
myfree(junk);
}
/*
* Send the completion status to the caller and terminate.
*/
attr_print(VSTREAM_OUT, ATTR_FLAG_NONE,
SEND_ATTR_INT(MAIL_ATTR_STATUS, status),
SEND_ATTR_STR(MAIL_ATTR_WHY, ""),
ATTR_TYPE_END);
vstream_fflush(VSTREAM_OUT);
exit(status);
}
static void postmap(char *map_type, char *path_name, int postmap_flags,
int open_flags, int dict_flags)
{
VSTREAM *NOCLOBBER source_fp;
VSTRING *line_buffer;
MKMAP *mkmap;
int lineno;
int last_line;
char *key;
char *value;
struct stat st;
mode_t saved_mask;
/*
* Initialize.
*/
line_buffer = vstring_alloc(100);
if ((open_flags & O_TRUNC) == 0) {
/* Incremental mode. */
source_fp = VSTREAM_IN;
vstream_control(source_fp, CA_VSTREAM_CTL_PATH("stdin"), CA_VSTREAM_CTL_END);
} else {
/* Create database. */
if (strcmp(map_type, DICT_TYPE_PROXY) == 0)
msg_fatal("can't create maps via the proxy service");
dict_flags |= DICT_FLAG_BULK_UPDATE;
if ((source_fp = vstream_fopen(path_name, O_RDONLY, 0)) == 0)
msg_fatal("open %s: %m", path_name);
}
if (fstat(vstream_fileno(source_fp), &st) < 0)
msg_fatal("fstat %s: %m", path_name);
/*
* Turn off group/other read permissions as indicated in the source file.
*/
if ((postmap_flags & POSTMAP_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
saved_mask = umask(022 | (~st.st_mode & 077));
/*
* If running as root, run as the owner of the source file, so that the
* result shows proper ownership, and so that a bug in postmap does not
* allow privilege escalation.
*/
if ((postmap_flags & POSTMAP_FLAG_AS_OWNER) && getuid() == 0
&& (st.st_uid != geteuid() || st.st_gid != getegid()))
set_eugid(st.st_uid, st.st_gid);
/*
* Open the database, optionally create it when it does not exist,
* optionally truncate it when it does exist, and lock out any
* spectators.
*/
mkmap = mkmap_open(map_type, path_name, open_flags, dict_flags);
/*
* And restore the umask, in case it matters.
*/
if ((postmap_flags & POSTMAP_FLAG_SAVE_PERM) && S_ISREG(st.st_mode))
umask(saved_mask);
/*
* Trap "exceptions" so that we can restart a bulk-mode update after a
* recoverable error.
*/
for (;;) {
if (dict_isjmp(mkmap->dict) != 0
&& dict_setjmp(mkmap->dict) != 0
&& vstream_fseek(source_fp, SEEK_SET, 0) < 0)
msg_fatal("seek %s: %m", VSTREAM_PATH(source_fp));
/*
* Add records to the database.
*/
last_line = 0;
while (readllines(line_buffer, source_fp, &last_line, &lineno)) {
/*
* First some UTF-8 checks sans casefolding.
*/
if ((mkmap->dict->flags & DICT_FLAG_UTF8_ACTIVE)
&& !allascii(STR(line_buffer))
&& !valid_utf8_string(STR(line_buffer), LEN(line_buffer))) {
msg_warn("%s, line %d: non-UTF-8 input \"%s\""
" -- ignoring this line",
VSTREAM_PATH(source_fp), lineno, STR(line_buffer));
continue;
}
/*
* Split on the first whitespace character, then trim leading and
* trailing whitespace from key and value.
*/
key = STR(line_buffer);
value = key + strcspn(key, CHARS_SPACE);
if (*value)
*value++ = 0;
while (ISSPACE(*value))
value++;
trimblanks(key, 0)[0] = 0;
trimblanks(value, 0)[0] = 0;
/*
* Enforce the "key whitespace value" format. Disallow missing
* keys or missing values.
*/
if (*key == 0 || *value == 0) {
msg_warn("%s, line %d: expected format: key whitespace value",
VSTREAM_PATH(source_fp), lineno);
continue;
}
if (key[strlen(key) - 1] == ':')
msg_warn("%s, line %d: record is in \"key: value\" format; is this an alias file?",
VSTREAM_PATH(source_fp), lineno);
/*
* Store the value under a case-insensitive key.
*/
mkmap_append(mkmap, key, value);
if (mkmap->dict->error)
msg_fatal("table %s:%s: write error: %m",
mkmap->dict->type, mkmap->dict->name);
}
break;
}
/*
* Close the mapping database, and release the lock.
*/
mkmap_close(mkmap);
/*
* Cleanup. We're about to terminate, but it is a good sanity check.
*/
vstring_free(line_buffer);
if (source_fp != VSTREAM_IN)
vstream_fclose(source_fp);
}
NORETURN multi_server_main(int argc, char **argv, MULTI_SERVER_FN service,...)
{
const char *myname = "multi_server_main";
VSTREAM *stream = 0;
char *root_dir = 0;
char *user_name = 0;
int debug_me = 0;
int daemon_mode = 1;
char *service_name = basename(argv[0]);
int delay;
int c;
int fd;
va_list ap;
MAIL_SERVER_INIT_FN pre_init = 0;
MAIL_SERVER_INIT_FN post_init = 0;
MAIL_SERVER_LOOP_FN loop = 0;
int key;
char *transport = 0;
#if 0
char *lock_path;
VSTRING *why;
#endif
int alone = 0;
int zerolimit = 0;
WATCHDOG *watchdog;
char *oname_val;
char *oname;
char *oval;
const char *err;
char *generation;
int msg_vstream_needed = 0;
int redo_syslog_init = 0;
/*
* Process environment options as early as we can.
*/
if (getenv(CONF_ENV_VERB))
msg_verbose = 1;
if (getenv(CONF_ENV_DEBUG))
debug_me = 1;
/*
* Don't die when a process goes away unexpectedly.
*/
signal(SIGPIPE, SIG_IGN);
/*
* Don't die for frivolous reasons.
*/
#ifdef SIGXFSZ
signal(SIGXFSZ, SIG_IGN);
#endif
/*
* May need this every now and then.
*/
var_procname = mystrdup(basename(argv[0]));
set_mail_conf_str(VAR_PROCNAME, var_procname);
/*
* Initialize logging and exit handler. Do the syslog first, so that its
* initialization completes before we enter the optional chroot jail.
*/
msg_syslog_init(mail_task(var_procname), LOG_PID, LOG_FACILITY);
if (msg_verbose)
msg_info("daemon started");
/*
* Check the Postfix library version as soon as we enable logging.
*/
MAIL_VERSION_CHECK;
/*
* Initialize from the configuration file. Allow command-line options to
* override compiled-in defaults or configured parameter values.
*/
mail_conf_suck();
/*
* Register dictionaries that use higher-level interfaces and protocols.
*/
mail_dict_init();
/*
* After database open error, continue execution with reduced
* functionality.
*/
dict_allow_surrogate = 1;
/*
* Pick up policy settings from master process. Shut up error messages to
* stderr, because no-one is going to see them.
*/
opterr = 0;
while ((c = GETOPT(argc, argv, "cdDi:lm:n:o:s:St:uvVz")) > 0) {
switch (c) {
case 'c':
root_dir = "setme";
break;
case 'd':
daemon_mode = 0;
break;
case 'D':
debug_me = 1;
break;
case 'i':
mail_conf_update(VAR_MAX_IDLE, optarg);
break;
case 'l':
alone = 1;
break;
case 'm':
mail_conf_update(VAR_MAX_USE, optarg);
break;
case 'n':
service_name = optarg;
break;
case 'o':
oname_val = mystrdup(optarg);
if ((err = split_nameval(oname_val, &oname, &oval)) != 0)
msg_fatal("invalid \"-o %s\" option value: %s", optarg, err);
mail_conf_update(oname, oval);
if (strcmp(oname, VAR_SYSLOG_NAME) == 0)
redo_syslog_init = 1;
myfree(oname_val);
break;
case 's':
if ((socket_count = atoi(optarg)) <= 0)
msg_fatal("invalid socket_count: %s", optarg);
break;
case 'S':
stream = VSTREAM_IN;
break;
case 'u':
user_name = "setme";
break;
case 't':
transport = optarg;
break;
case 'v':
msg_verbose++;
break;
case 'V':
if (++msg_vstream_needed == 1)
msg_vstream_init(mail_task(var_procname), VSTREAM_ERR);
break;
case 'z':
zerolimit = 1;
break;
default:
msg_fatal("invalid option: %c", c);
break;
}
}
/*
* Initialize generic parameters.
*/
mail_params_init();
if (redo_syslog_init)
msg_syslog_init(mail_task(var_procname), LOG_PID, LOG_FACILITY);
/*
* If not connected to stdin, stdin must not be a terminal.
*/
if (daemon_mode && stream == 0 && isatty(STDIN_FILENO)) {
msg_vstream_init(var_procname, VSTREAM_ERR);
msg_fatal("do not run this command by hand");
}
/*
* Application-specific initialization.
*/
va_start(ap, service);
while ((key = va_arg(ap, int)) != 0) {
switch (key) {
case MAIL_SERVER_INT_TABLE:
get_mail_conf_int_table(va_arg(ap, CONFIG_INT_TABLE *));
break;
case MAIL_SERVER_LONG_TABLE:
get_mail_conf_long_table(va_arg(ap, CONFIG_LONG_TABLE *));
break;
case MAIL_SERVER_STR_TABLE:
get_mail_conf_str_table(va_arg(ap, CONFIG_STR_TABLE *));
break;
case MAIL_SERVER_BOOL_TABLE:
get_mail_conf_bool_table(va_arg(ap, CONFIG_BOOL_TABLE *));
break;
case MAIL_SERVER_TIME_TABLE:
get_mail_conf_time_table(va_arg(ap, CONFIG_TIME_TABLE *));
break;
case MAIL_SERVER_RAW_TABLE:
get_mail_conf_raw_table(va_arg(ap, CONFIG_RAW_TABLE *));
break;
case MAIL_SERVER_NINT_TABLE:
get_mail_conf_nint_table(va_arg(ap, CONFIG_NINT_TABLE *));
break;
case MAIL_SERVER_NBOOL_TABLE:
get_mail_conf_nbool_table(va_arg(ap, CONFIG_NBOOL_TABLE *));
break;
case MAIL_SERVER_PRE_INIT:
pre_init = va_arg(ap, MAIL_SERVER_INIT_FN);
break;
case MAIL_SERVER_POST_INIT:
post_init = va_arg(ap, MAIL_SERVER_INIT_FN);
break;
case MAIL_SERVER_LOOP:
loop = va_arg(ap, MAIL_SERVER_LOOP_FN);
break;
case MAIL_SERVER_EXIT:
multi_server_onexit = va_arg(ap, MAIL_SERVER_EXIT_FN);
break;
case MAIL_SERVER_PRE_ACCEPT:
multi_server_pre_accept = va_arg(ap, MAIL_SERVER_ACCEPT_FN);
break;
case MAIL_SERVER_PRE_DISCONN:
multi_server_pre_disconn = va_arg(ap, MAIL_SERVER_DISCONN_FN);
break;
case MAIL_SERVER_IN_FLOW_DELAY:
multi_server_in_flow_delay = 1;
break;
case MAIL_SERVER_SOLITARY:
if (stream == 0 && !alone)
msg_fatal("service %s requires a process limit of 1",
service_name);
break;
case MAIL_SERVER_UNLIMITED:
if (stream == 0 && !zerolimit)
msg_fatal("service %s requires a process limit of 0",
service_name);
break;
case MAIL_SERVER_PRIVILEGED:
if (user_name)
msg_fatal("service %s requires privileged operation",
service_name);
break;
default:
msg_panic("%s: unknown argument type: %d", myname, key);
}
}
va_end(ap);
if (root_dir)
root_dir = var_queue_dir;
if (user_name)
user_name = var_mail_owner;
/*
* Can options be required?
*/
if (stream == 0) {
if (transport == 0)
msg_fatal("no transport type specified");
if (strcasecmp(transport, MASTER_XPORT_NAME_INET) == 0)
multi_server_accept = multi_server_accept_inet;
else if (strcasecmp(transport, MASTER_XPORT_NAME_UNIX) == 0)
multi_server_accept = multi_server_accept_local;
#ifdef MASTER_XPORT_NAME_PASS
else if (strcasecmp(transport, MASTER_XPORT_NAME_PASS) == 0)
multi_server_accept = multi_server_accept_pass;
#endif
else
msg_fatal("unsupported transport type: %s", transport);
}
/*
* Retrieve process generation from environment.
*/
if ((generation = getenv(MASTER_GEN_NAME)) != 0) {
if (!alldig(generation))
msg_fatal("bad generation: %s", generation);
OCTAL_TO_UNSIGNED(multi_server_generation, generation);
if (msg_verbose)
msg_info("process generation: %s (%o)",
generation, multi_server_generation);
}
/*
* Optionally start the debugger on ourself.
*/
if (debug_me)
debug_process();
/*
* Traditionally, BSD select() can't handle multiple processes selecting
* on the same socket, and wakes up every process in select(). See TCP/IP
* Illustrated volume 2 page 532. We avoid select() collisions with an
* external lock file.
*/
/*
* XXX Can't compete for exclusive access to the listen socket because we
* also have to monitor existing client connections for service requests.
*/
#if 0
if (stream == 0 && !alone) {
lock_path = concatenate(DEF_PID_DIR, "/", transport,
".", service_name, (char *) 0);
why = vstring_alloc(1);
if ((multi_server_lock = safe_open(lock_path, O_CREAT | O_RDWR, 0600,
(struct stat *) 0, -1, -1, why)) == 0)
msg_fatal("open lock file %s: %s", lock_path, vstring_str(why));
close_on_exec(vstream_fileno(multi_server_lock), CLOSE_ON_EXEC);
myfree(lock_path);
vstring_free(why);
}
#endif
/*
* Set up call-back info.
*/
multi_server_service = service;
multi_server_name = service_name;
multi_server_argv = argv + optind;
/*
* Run pre-jail initialization.
*/
if (chdir(var_queue_dir) < 0)
msg_fatal("chdir(\"%s\"): %m", var_queue_dir);
if (pre_init)
pre_init(multi_server_name, multi_server_argv);
/*
* Optionally, restrict the damage that this process can do.
*/
resolve_local_init();
tzset();
chroot_uid(root_dir, user_name);
/*
* Run post-jail initialization.
*/
if (post_init)
post_init(multi_server_name, multi_server_argv);
/*
* Are we running as a one-shot server with the client connection on
* standard input? If so, make sure the output is written to stdout so as
* to satisfy common expectation.
*/
if (stream != 0) {
vstream_control(stream,
VSTREAM_CTL_DOUBLE,
VSTREAM_CTL_WRITE_FD, STDOUT_FILENO,
VSTREAM_CTL_END);
service(stream, multi_server_name, multi_server_argv);
vstream_fflush(stream);
multi_server_exit();
}
/*
* Running as a semi-resident server. Service connection requests.
* Terminate when we have serviced a sufficient number of clients, when
* no-one has been talking to us for a configurable amount of time, or
* when the master process terminated abnormally.
*/
if (var_idle_limit > 0)
event_request_timer(multi_server_timeout, (char *) 0, var_idle_limit);
for (fd = MASTER_LISTEN_FD; fd < MASTER_LISTEN_FD + socket_count; fd++) {
event_enable_read(fd, multi_server_accept, CAST_INT_TO_CHAR_PTR(fd));
close_on_exec(fd, CLOSE_ON_EXEC);
}
event_enable_read(MASTER_STATUS_FD, multi_server_abort, (char *) 0);
close_on_exec(MASTER_STATUS_FD, CLOSE_ON_EXEC);
close_on_exec(MASTER_FLOW_READ, CLOSE_ON_EXEC);
close_on_exec(MASTER_FLOW_WRITE, CLOSE_ON_EXEC);
watchdog = watchdog_create(var_daemon_timeout, (WATCHDOG_FN) 0, (char *) 0);
/*
* The event loop, at last.
*/
while (var_use_limit == 0 || use_count < var_use_limit || client_count > 0) {
if (multi_server_lock != 0) {
watchdog_stop(watchdog);
if (myflock(vstream_fileno(multi_server_lock), INTERNAL_LOCK,
MYFLOCK_OP_EXCLUSIVE) < 0)
msg_fatal("select lock: %m");
}
watchdog_start(watchdog);
delay = loop ? loop(multi_server_name, multi_server_argv) : -1;
event_loop(delay);
}
multi_server_exit();
}
int smtpd_peer_from_haproxy(SMTPD_STATE *state)
{
const char *myname = "smtpd_peer_from_haproxy";
MAI_HOSTADDR_STR smtp_client_addr;
MAI_SERVPORT_STR smtp_client_port;
MAI_HOSTADDR_STR smtp_server_addr;
MAI_SERVPORT_STR smtp_server_port;
const char *proxy_err;
int io_err;
VSTRING *escape_buf;
/*
* While reading HAProxy handshake information, don't buffer input beyond
* the end-of-line. That would break the TLS wrappermode handshake.
*/
vstream_control(state->client,
VSTREAM_CTL_BUFSIZE, 1,
VSTREAM_CTL_END);
/*
* Note: the haproxy_srvr_parse() routine performs address protocol
* checks, address and port syntax checks, and converts IPv4-in-IPv6
* address string syntax (:ffff::1.2.3.4) to IPv4 syntax where permitted
* by the main.cf:inet_protocols setting, but logs no warnings.
*/
#define ENABLE_DEADLINE 1
smtp_stream_setup(state->client, var_smtpd_uproxy_tmout, ENABLE_DEADLINE);
switch (io_err = vstream_setjmp(state->client)) {
default:
msg_panic("%s: unhandled I/O error %d", myname, io_err);
case SMTP_ERR_EOF:
msg_warn("haproxy read: unexpected EOF");
return (-1);
case SMTP_ERR_TIME:
msg_warn("haproxy read: timeout error");
return (-1);
case 0:
if (smtp_get(state->buffer, state->client, HAPROXY_MAX_LEN,
SMTP_GET_FLAG_NONE) != '\n') {
msg_warn("haproxy read: line > %d characters", HAPROXY_MAX_LEN);
return (-1);
}
if ((proxy_err = haproxy_srvr_parse(STR(state->buffer),
&smtp_client_addr, &smtp_client_port,
&smtp_server_addr, &smtp_server_port)) != 0) {
escape_buf = vstring_alloc(HAPROXY_MAX_LEN + 2);
escape(escape_buf, STR(state->buffer), LEN(state->buffer));
msg_warn("haproxy read: %s: %s", proxy_err, STR(escape_buf));
vstring_free(escape_buf);
return (-1);
}
state->addr = mystrdup(smtp_client_addr.buf);
if (strrchr(state->addr, ':') != 0) {
state->rfc_addr = concatenate(IPV6_COL, state->addr, (char *) 0);
state->addr_family = AF_INET6;
} else {
state->rfc_addr = mystrdup(state->addr);
state->addr_family = AF_INET;
}
state->port = mystrdup(smtp_client_port.buf);
/*
* The Dovecot authentication server needs the server IP address.
*/
state->dest_addr = mystrdup(smtp_server_addr.buf);
state->dest_port = mystrdup(smtp_server_port.buf);
/*
* Enable normal buffering.
*/
vstream_control(state->client,
VSTREAM_CTL_BUFSIZE, VSTREAM_BUFSIZE,
VSTREAM_CTL_END);
return (0);
}
}
static int xsasl_dovecot_server_connect(XSASL_DOVECOT_SERVER_IMPL *xp)
{
const char *myname = "xsasl_dovecot_server_connect";
VSTRING *line_str;
VSTREAM *sasl_stream;
char *line, *cmd, *mech_name;
unsigned int major_version, minor_version;
int fd, success;
int sec_props;
const char *path;
if (msg_verbose)
msg_info("%s: Connecting", myname);
/*
* Not documented, but necessary for testing.
*/
path = xp->socket_path;
if (strncmp(path, "inet:", 5) == 0) {
fd = inet_connect(path + 5, BLOCKING, AUTH_TIMEOUT);
} else {
if (strncmp(path, "unix:", 5) == 0)
path += 5;
fd = unix_connect(path, BLOCKING, AUTH_TIMEOUT);
}
if (fd < 0) {
msg_warn("SASL: Connect to %s failed: %m", xp->socket_path);
return (-1);
}
sasl_stream = vstream_fdopen(fd, O_RDWR);
vstream_control(sasl_stream,
VSTREAM_CTL_PATH, xp->socket_path,
VSTREAM_CTL_TIMEOUT, AUTH_TIMEOUT,
VSTREAM_CTL_END);
/* XXX Encapsulate for logging. */
vstream_fprintf(sasl_stream,
"VERSION\t%u\t%u\n"
"CPID\t%u\n",
AUTH_PROTOCOL_MAJOR_VERSION,
AUTH_PROTOCOL_MINOR_VERSION,
(unsigned int) getpid());
if (vstream_fflush(sasl_stream) == VSTREAM_EOF) {
msg_warn("SASL: Couldn't send handshake: %m");
return (-1);
}
success = 0;
line_str = vstring_alloc(256);
/* XXX Encapsulate for logging. */
while (vstring_get_nonl(line_str, sasl_stream) != VSTREAM_EOF) {
line = vstring_str(line_str);
if (msg_verbose)
msg_info("%s: auth reply: %s", myname, line);
cmd = line;
line = split_at(line, '\t');
if (strcmp(cmd, "VERSION") == 0) {
if (sscanf(line, "%u\t%u", &major_version, &minor_version) != 2) {
msg_warn("SASL: Protocol version error");
break;
}
if (major_version != AUTH_PROTOCOL_MAJOR_VERSION) {
/* Major version is different from ours. */
msg_warn("SASL: Protocol version mismatch (%d vs. %d)",
major_version, AUTH_PROTOCOL_MAJOR_VERSION);
break;
}
} else if (strcmp(cmd, "MECH") == 0 && line != NULL) {
mech_name = line;
line = split_at(line, '\t');
if (line != 0) {
sec_props =
name_mask_delim_opt(myname,
xsasl_dovecot_serv_sec_props,
line, "\t",
NAME_MASK_ANY_CASE | NAME_MASK_IGNORE);
if ((sec_props & SEC_PROPS_PRIVATE) != 0)
continue;
} else
sec_props = 0;
xsasl_dovecot_server_mech_append(&xp->mechanism_list, mech_name,
sec_props);
} else if (strcmp(cmd, "DONE") == 0) {
/* Handshake finished. */
success = 1;
break;
} else {
/* ignore any unknown commands */
}
}
vstring_free(line_str);
if (!success) {
/* handshake failed */
(void) vstream_fclose(sasl_stream);
return (-1);
}
xp->sasl_stream = sasl_stream;
return (0);
}
static int smtpd_proxy_connect(SMTPD_STATE *state)
{
SMTPD_PROXY *proxy = state->proxy;
int fd;
char *lines;
char *words;
VSTRING *buf;
int bad;
char *word;
static const NAME_CODE known_xforward_features[] = {
XFORWARD_NAME, SMTPD_PROXY_XFORWARD_NAME,
XFORWARD_ADDR, SMTPD_PROXY_XFORWARD_ADDR,
XFORWARD_PORT, SMTPD_PROXY_XFORWARD_PORT,
XFORWARD_PROTO, SMTPD_PROXY_XFORWARD_PROTO,
XFORWARD_HELO, SMTPD_PROXY_XFORWARD_HELO,
XFORWARD_IDENT, SMTPD_PROXY_XFORWARD_IDENT,
XFORWARD_DOMAIN, SMTPD_PROXY_XFORWARD_DOMAIN,
0, 0,
};
int server_xforward_features;
int (*connect_fn) (const char *, int, int);
const char *endpoint;
/*
* Find connection method (default inet)
*/
if (strncasecmp("unix:", proxy->service_name, 5) == 0) {
endpoint = proxy->service_name + 5;
connect_fn = unix_connect;
} else {
if (strncasecmp("inet:", proxy->service_name, 5) == 0)
endpoint = proxy->service_name + 5;
else
endpoint = proxy->service_name;
connect_fn = inet_connect;
}
/*
* Connect to proxy.
*/
if ((fd = connect_fn(endpoint, BLOCKING, proxy->timeout)) < 0) {
msg_warn("connect to proxy filter %s: %m", proxy->service_name);
return (smtpd_proxy_rdwr_error(state, 0));
}
proxy->service_stream = vstream_fdopen(fd, O_RDWR);
/* Needed by our DATA-phase record emulation routines. */
vstream_control(proxy->service_stream, VSTREAM_CTL_CONTEXT,
(char *) state, VSTREAM_CTL_END);
/* Avoid poor performance when TCP MSS > VSTREAM_BUFSIZE. */
if (connect_fn == inet_connect)
vstream_tweak_tcp(proxy->service_stream);
smtp_timeout_setup(proxy->service_stream, proxy->timeout);
/*
* Get server greeting banner.
*
* If this fails then we have a problem because the proxy should always
* accept our connection. Make up our own response instead of passing
* back a negative greeting banner: the proxy open is delayed to the
* point that the client expects a MAIL FROM or RCPT TO reply.
*/
if (smtpd_proxy_cmd(state, SMTPD_PROX_WANT_OK, SMTPD_PROXY_CONN_FMT)) {
smtpd_proxy_fake_server_reply(state, CLEANUP_STAT_PROXY);
smtpd_proxy_close(state);
return (-1);
}
/*
* Send our own EHLO command. If this fails then we have a problem
* because the proxy should always accept our EHLO command. Make up our
* own response instead of passing back a negative EHLO reply: the proxy
* open is delayed to the point that the remote SMTP client expects a
* MAIL FROM or RCPT TO reply.
*/
if (smtpd_proxy_cmd(state, SMTPD_PROX_WANT_OK, "EHLO %s",
proxy->ehlo_name)) {
smtpd_proxy_fake_server_reply(state, CLEANUP_STAT_PROXY);
smtpd_proxy_close(state);
return (-1);
}
/*
* Parse the EHLO reply and see if we can forward logging information.
*/
server_xforward_features = 0;
lines = STR(proxy->reply);
while ((words = mystrtok(&lines, "\n")) != 0) {
if (mystrtok(&words, "- ") && (word = mystrtok(&words, " \t")) != 0) {
if (strcasecmp(word, XFORWARD_CMD) == 0)
while ((word = mystrtok(&words, " \t")) != 0)
server_xforward_features |=
name_code(known_xforward_features,
NAME_CODE_FLAG_NONE, word);
}
}
/*
* Send XFORWARD attributes. For robustness, explicitly specify what SMTP
* session attributes are known and unknown. Make up our own response
* instead of passing back a negative XFORWARD reply: the proxy open is
* delayed to the point that the remote SMTP client expects a MAIL FROM
* or RCPT TO reply.
*/
if (server_xforward_features) {
buf = vstring_alloc(100);
bad =
(((server_xforward_features & SMTPD_PROXY_XFORWARD_NAME)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_NAME,
IS_AVAIL_CLIENT_NAME(FORWARD_NAME(state)),
FORWARD_NAME(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_ADDR)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_ADDR,
IS_AVAIL_CLIENT_ADDR(FORWARD_ADDR(state)),
FORWARD_ADDR(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_PORT)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_PORT,
IS_AVAIL_CLIENT_PORT(FORWARD_PORT(state)),
FORWARD_PORT(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_HELO)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_HELO,
IS_AVAIL_CLIENT_HELO(FORWARD_HELO(state)),
FORWARD_HELO(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_IDENT)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_IDENT,
IS_AVAIL_CLIENT_IDENT(FORWARD_IDENT(state)),
FORWARD_IDENT(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_PROTO)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_PROTO,
IS_AVAIL_CLIENT_PROTO(FORWARD_PROTO(state)),
FORWARD_PROTO(state)))
|| ((server_xforward_features & SMTPD_PROXY_XFORWARD_DOMAIN)
&& smtpd_proxy_xforward_send(state, buf, XFORWARD_DOMAIN, 1,
STREQ(FORWARD_DOMAIN(state), MAIL_ATTR_RWR_LOCAL) ?
XFORWARD_DOM_LOCAL : XFORWARD_DOM_REMOTE))
|| smtpd_proxy_xforward_flush(state, buf));
vstring_free(buf);
if (bad) {
smtpd_proxy_fake_server_reply(state, CLEANUP_STAT_PROXY);
smtpd_proxy_close(state);
return (-1);
}
}
/*
* Pass-through the remote SMTP client's MAIL FROM command. If this
* fails, then we have a problem because the proxy should always accept
* any MAIL FROM command that was accepted by us.
*/
if (smtpd_proxy_cmd(state, SMTPD_PROX_WANT_OK, "%s",
proxy->mail_from) != 0) {
/* NOT: smtpd_proxy_fake_server_reply(state, CLEANUP_STAT_PROXY); */
smtpd_proxy_close(state);
return (-1);
}
return (0);
}
static void psc_endpt_haproxy_event(int event, char *context)
{
const char *myname = "psc_endpt_haproxy_event";
PSC_HAPROXY_STATE *state = (PSC_HAPROXY_STATE *) context;
int status = 0;
MAI_HOSTADDR_STR smtp_client_addr;
MAI_SERVPORT_STR smtp_client_port;
MAI_HOSTADDR_STR smtp_server_addr;
MAI_SERVPORT_STR smtp_server_port;
int last_char = 0;
const char *err;
VSTRING *escape_buf;
char read_buf[HAPROXY_MAX_LEN];
ssize_t read_len;
char *cp;
/*
* We must not read(2) past the <CR><LF> that terminates the haproxy
* line. For efficiency reasons we read the entire haproxy line in one
* read(2) call when we know that the line is unfragmented. In the rare
* case that the line is fragmented, we fall back and read(2) it one
* character at a time.
*/
switch (event) {
case EVENT_TIME:
msg_warn("haproxy read: time limit exceeded");
status = -1;
break;
case EVENT_READ:
/* Determine the initial VSTREAM read(2) buffer size. */
if (VSTRING_LEN(state->buffer) == 0) {
if ((read_len = recv(vstream_fileno(state->stream),
read_buf, sizeof(read_buf) - 1, MSG_PEEK)) > 0
&& ((cp = memchr(read_buf, '\n', read_len)) != 0)) {
read_len = cp - read_buf + 1;
} else {
read_len = 1;
}
vstream_control(state->stream, VSTREAM_CTL_BUFSIZE, read_len,
VSTREAM_CTL_END);
}
/* Drain the VSTREAM buffer, otherwise this pseudo-thread will hang. */
do {
if ((last_char = VSTREAM_GETC(state->stream)) == VSTREAM_EOF) {
if (vstream_ferror(state->stream))
msg_warn("haproxy read: %m");
else
msg_warn("haproxy read: lost connection");
status = -1;
break;
}
if (VSTRING_LEN(state->buffer) >= HAPROXY_MAX_LEN) {
msg_warn("haproxy read: line too long");
status = -1;
break;
}
VSTRING_ADDCH(state->buffer, last_char);
} while (vstream_peek(state->stream) > 0);
break;
}
/*
* Parse the haproxy line. Note: the haproxy_srvr_parse() routine
* performs address protocol checks, address and port syntax checks, and
* converts IPv4-in-IPv6 address string syntax (:ffff::1.2.3.4) to IPv4
* syntax where permitted by the main.cf:inet_protocols setting.
*/
if (status == 0 && last_char == '\n') {
VSTRING_TERMINATE(state->buffer);
if ((err = haproxy_srvr_parse(vstring_str(state->buffer),
&smtp_client_addr, &smtp_client_port,
&smtp_server_addr, &smtp_server_port)) != 0) {
escape_buf = vstring_alloc(HAPROXY_MAX_LEN + 2);
escape(escape_buf, vstring_str(state->buffer),
VSTRING_LEN(state->buffer));
msg_warn("haproxy read: %s: %s", err, vstring_str(escape_buf));
status = -1;
vstring_free(escape_buf);
}
}
/*
* Are we done yet?
*/
if (status < 0 || last_char == '\n') {
PSC_CLEAR_EVENT_REQUEST(vstream_fileno(state->stream),
psc_endpt_haproxy_event, context);
vstream_control(state->stream,
VSTREAM_CTL_BUFSIZE, (ssize_t) VSTREAM_BUFSIZE,
VSTREAM_CTL_END);
state->notify(status, state->stream,
&smtp_client_addr, &smtp_client_port,
&smtp_server_addr, &smtp_server_port);
/* Note: the stream may be closed at this point. */
vstring_free(state->buffer);
myfree((char *) state);
}
}
