/* initialize the network
* we talk on unix sockets
*/
static struct backend *init_net(const char *unixpath)
{
int lmtpdsock;
struct sockaddr_un addr;
struct backend *conn;
if ((lmtpdsock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
just_exit("socket failed");
}
addr.sun_family = AF_UNIX;
strlcpy(addr.sun_path, unixpath, sizeof(addr.sun_path));
if (connect(lmtpdsock, (struct sockaddr *) &addr,
sizeof(addr.sun_family) + strlen(addr.sun_path) + 1) < 0) {
just_exit("connect failed");
}
conn = xzmalloc(sizeof(struct backend));
conn->timeout = NULL;
conn->in = prot_new(lmtpdsock, 0);
conn->out = prot_new(lmtpdsock, 1);
conn->sock = lmtpdsock;
prot_setflushonread(conn->in, conn->out);
conn->prot = &lmtp_protocol;
return conn;
}
int init_net(const char *host, char *port,
struct protstream **in, struct protstream **out)
{
int sock = -1, err;
struct addrinfo hints, *res, *res0;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = 0;
if ((err = getaddrinfo(host, port, &hints, &res0)) != 0) {
syslog(LOG_ERR, "getaddrinfo(%s, %s) failed: %m", host, port);
return -1;
}
for (res = res0; res; res = res->ai_next) {
if ((sock = socket(res->ai_family, res->ai_socktype,
res->ai_protocol)) < 0)
continue;
if (connect(sock, res->ai_addr, res->ai_addrlen) >= 0)
break;
close(sock);
sock = -1;
}
freeaddrinfo(res0);
if(sock < 0) {
syslog(LOG_ERR, "connect(%s:%s) failed: %m", host, port);
return -1;
}
*in = prot_new(sock, 0);
*out = prot_new(sock, 1);
prot_setflushonread(*in, *out);
return sock;
}
int main(int argc, char **argv)
{
int r = 0;
int opt;
int lmtpflag = 0;
int ignorequota = 0;
char *mailboxname = NULL;
char *authuser = NULL;
char *return_path = NULL;
char buf[1024];
char *alt_config = NULL;
while ((opt = getopt(argc, argv, "C:df:r:m:a:F:eE:lqD")) != EOF) {
switch(opt) {
case 'C': /* alt config file */
alt_config = optarg;
break;
case 'd':
/* Ignore -- /bin/mail compatibility flags */
break;
case 'D':
logdebug = 1;
break;
case 'r':
case 'f':
return_path = optarg;
break;
case 'm':
if (mailboxname) {
fprintf(stderr, "deliver: multiple -m options\n");
usage();
/* NOTREACHED */
}
if (*optarg) mailboxname = optarg;
break;
case 'a':
if (authuser) {
fprintf(stderr, "deliver: multiple -a options\n");
usage();
/* NOTREACHED */
}
authuser = optarg;
break;
case 'F': /* set IMAP flag. we no longer support this */
fprintf(stderr,"deliver: 'F' option no longer supported\n");
usage();
break;
case 'e':
/* duplicate delivery. ignore */
break;
case 'E':
fprintf(stderr,"deliver: 'E' option no longer supported\n");
usage();
break;
case 'l':
lmtpflag = 1;
break;
case 'q':
ignorequota = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
deliver_in = prot_new(0, 0);
deliver_out = prot_new(1, 1);
prot_setflushonread(deliver_in, deliver_out);
prot_settimeout(deliver_in, 300);
cyrus_init(alt_config, "deliver", CYRUSINIT_NODB);
sockaddr = config_getstring(IMAPOPT_LMTPSOCKET);
if (!sockaddr) {
strlcpy(buf, config_dir, sizeof(buf));
strlcat(buf, "/socket/lmtp", sizeof(buf));
sockaddr = buf;
}
if (lmtpflag == 1) {
struct backend *conn = init_net(sockaddr);
pipe_through(conn);
backend_disconnect(conn);
free(conn);
}
else {
if (return_path == NULL) {
uid_t me = getuid();
struct passwd *p = getpwuid(me);
return_path = p->pw_name;
}
/* deliver to users or global mailbox */
r = deliver_msg(return_path,authuser, ignorequota,
argv+optind, argc - optind, mailboxname);
}
cyrus_done();
return r;
}
struct backend *backend_connect(struct backend *ret_backend, const char *server,
struct protocol_t *prot, const char *userid,
sasl_callback_t *cb, const char **auth_status)
{
/* need to (re)establish connection to server or create one */
int sock = -1;
int r;
int err = -1;
int ask = 1; /* should we explicitly ask for capabilities? */
struct addrinfo hints, *res0 = NULL, *res;
struct sockaddr_un sunsock;
char buf[2048];
struct sigaction action;
struct backend *ret;
char rsessionid[MAX_SESSIONID_SIZE];
if (!ret_backend) {
ret = xzmalloc(sizeof(struct backend));
strlcpy(ret->hostname, server, sizeof(ret->hostname));
ret->timeout = NULL;
}
else
ret = ret_backend;
if (server[0] == '/') { /* unix socket */
res0 = &hints;
memset(res0, 0, sizeof(struct addrinfo));
res0->ai_family = PF_UNIX;
res0->ai_socktype = SOCK_STREAM;
res0->ai_addr = (struct sockaddr *) &sunsock;
res0->ai_addrlen = sizeof(sunsock.sun_family) + strlen(server) + 1;
#ifdef SIN6_LEN
res0->ai_addrlen += sizeof(sunsock.sun_len);
sunsock.sun_len = res0->ai_addrlen;
#endif
sunsock.sun_family = AF_UNIX;
strlcpy(sunsock.sun_path, server, sizeof(sunsock.sun_path));
/* XXX set that we are preauthed */
/* change hostname to 'config_servername' */
strlcpy(ret->hostname, config_servername, sizeof(ret->hostname));
}
else { /* inet socket */
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err = getaddrinfo(server, prot->service, &hints, &res0);
if (err) {
syslog(LOG_ERR, "getaddrinfo(%s) failed: %s",
server, gai_strerror(err));
goto error;
}
}
/* Setup timeout */
timedout = 0;
action.sa_flags = 0;
action.sa_handler = timed_out;
sigemptyset(&action.sa_mask);
if(sigaction(SIGALRM, &action, NULL) < 0)
{
syslog(LOG_ERR, "Setting timeout in backend_connect failed: sigaction: %m");
/* continue anyway */
}
for (res = res0; res; res = res->ai_next) {
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sock < 0)
continue;
alarm(config_getint(IMAPOPT_CLIENT_TIMEOUT));
if (connect(sock, res->ai_addr, res->ai_addrlen) >= 0)
break;
if(errno == EINTR && timedout == 1)
errno = ETIMEDOUT;
close(sock);
sock = -1;
}
/* Remove timeout code */
alarm(0);
signal(SIGALRM, SIG_IGN);
if (sock < 0) {
if (res0 != &hints)
freeaddrinfo(res0);
syslog(LOG_ERR, "connect(%s) failed: %m", server);
goto error;
}
memcpy(&ret->addr, res->ai_addr, res->ai_addrlen);
if (res0 != &hints)
freeaddrinfo(res0);
ret->in = prot_new(sock, 0);
ret->out = prot_new(sock, 1);
ret->sock = sock;
prot_setflushonread(ret->in, ret->out);
ret->prot = prot;
/* use literal+ to send literals */
prot_setisclient(ret->in, 1);
prot_setisclient(ret->out, 1);
if (prot->banner.auto_capa) {
/* try to get the capabilities from the banner */
r = ask_capability(ret, /*dobanner*/1, AUTO_CAPA_BANNER);
if (r) {
/* found capabilities in banner -> don't ask */
ask = 0;
}
}
else {
do { /* read the initial greeting */
if (!prot_fgets(buf, sizeof(buf), ret->in)) {
syslog(LOG_ERR,
"backend_connect(): couldn't read initial greeting: %s",
ret->in->error ? ret->in->error : "(null)");
goto error;
}
} while (strncasecmp(buf, prot->banner.resp,
strlen(prot->banner.resp)));
strncpy(ret->banner, buf, 2048);
}
if (ask) {
/* get the capabilities */
ask_capability(ret, /*dobanner*/0, AUTO_CAPA_NO);
}
/* now need to authenticate to backend server,
unless we're doing LMTP/CSYNC on a UNIX socket (deliver/sync_client) */
if ((server[0] != '/') ||
(strcmp(prot->sasl_service, "lmtp") &&
strcmp(prot->sasl_service, "csync"))) {
char *old_mechlist = backend_get_cap_params(ret, CAPA_AUTH);
const char *my_status;
if ((r = backend_authenticate(ret, userid, cb, &my_status))) {
syslog(LOG_ERR, "couldn't authenticate to backend server: %s",
sasl_errstring(r, NULL, NULL));
free(old_mechlist);
goto error;
}
else {
const void *ssf;
sasl_getprop(ret->saslconn, SASL_SSF, &ssf);
if (*((sasl_ssf_t *) ssf)) {
/* if we have a SASL security layer, compare SASL mech lists
before/after AUTH to check for a MITM attack */
char *new_mechlist;
int auto_capa = (prot->sasl_cmd.auto_capa == AUTO_CAPA_AUTH_SSF);
if (!strcmp(prot->service, "sieve")) {
/* XXX Hack to handle ManageSieve servers.
* No way to tell from protocol if server will
* automatically send capabilities, so we treat it
* as optional.
*/
char ch;
/* wait and probe for possible auto-capability response */
usleep(250000);
prot_NONBLOCK(ret->in);
if ((ch = prot_getc(ret->in)) != EOF) {
prot_ungetc(ch, ret->in);
} else {
auto_capa = AUTO_CAPA_AUTH_NO;
}
prot_BLOCK(ret->in);
}
ask_capability(ret, /*dobanner*/0, auto_capa);
new_mechlist = backend_get_cap_params(ret, CAPA_AUTH);
if (new_mechlist &&
old_mechlist &&
strcmp(new_mechlist, old_mechlist)) {
syslog(LOG_ERR, "possible MITM attack:"
"list of available SASL mechanisms changed");
free(new_mechlist);
free(old_mechlist);
goto error;
}
free(new_mechlist);
}
else if (prot->sasl_cmd.auto_capa == AUTO_CAPA_AUTH_OK) {
/* try to get the capabilities from the AUTH success response */
forget_capabilities(ret);
parse_capability(ret, my_status);
post_parse_capability(ret);
}
if (!(strcmp(prot->service, "imap") &&
(strcmp(prot->service, "pop3")))) {
parse_sessionid(my_status, rsessionid);
syslog(LOG_NOTICE, "proxy %s sessionid=<%s> remote=<%s>", userid, session_id(), rsessionid);
}
}
if (auth_status) *auth_status = my_status;
free(old_mechlist);
}
/* start compression if requested and both client/server support it */
if (config_getswitch(IMAPOPT_PROXY_COMPRESS) && ret &&
CAPA(ret, CAPA_COMPRESS) &&
prot->compress_cmd.cmd &&
do_compress(ret, &prot->compress_cmd)) {
syslog(LOG_ERR, "couldn't enable compression on backend server");
goto error;
}
return ret;
error:
forget_capabilities(ret);
if (ret->in) {
prot_free(ret->in);
ret->in = NULL;
}
if (ret->out) {
prot_free(ret->out);
ret->out = NULL;
}
if (sock >= 0)
close(sock);
if (ret->saslconn) {
sasl_dispose(&ret->saslconn);
ret->saslconn = NULL;
}
if (!ret_backend)
free(ret);
return NULL;
}
EXPORTED struct backend *backend_connect(struct backend *ret_backend, const char *server,
struct protocol_t *prot, const char *userid,
sasl_callback_t *cb, const char **auth_status,
int logfd)
{
/* need to (re)establish connection to server or create one */
int sock = -1;
int r;
int err = -1;
int do_tls = 0;
int noauth = 0;
struct addrinfo hints, *res0 = NULL, *res;
struct sockaddr_un sunsock;
struct backend *ret;
if (!ret_backend) {
ret = xzmalloc(sizeof(struct backend));
strlcpy(ret->hostname, server, sizeof(ret->hostname));
ret->timeout = NULL;
}
else
ret = ret_backend;
if (server[0] == '/') { /* unix socket */
res0 = &hints;
memset(res0, 0, sizeof(struct addrinfo));
res0->ai_family = PF_UNIX;
res0->ai_socktype = SOCK_STREAM;
res0->ai_addr = (struct sockaddr *) &sunsock;
res0->ai_addrlen = sizeof(sunsock.sun_family) + strlen(server) + 1;
#ifdef SIN6_LEN
res0->ai_addrlen += sizeof(sunsock.sun_len);
sunsock.sun_len = res0->ai_addrlen;
#endif
sunsock.sun_family = AF_UNIX;
strlcpy(sunsock.sun_path, server, sizeof(sunsock.sun_path));
if (!strcmp(prot->sasl_service, "lmtp") ||
!strcmp(prot->sasl_service, "csync")) {
noauth = 1;
}
}
else { /* inet socket */
char host[1024], *p;
const char *service = prot->service;
/* Parse server string for possible port and options */
strlcpy(host, server, sizeof(host));
if ((p = strchr(host, ':'))) {
*p++ = '\0';
service = p;
if ((p = strchr(service, '/'))) {
tok_t tok;
char *opt;
*p++ = '\0';
tok_initm(&tok, p, "/", 0);
while ((opt = tok_next(&tok))) {
if (!strcmp(opt, "tls")) do_tls = 1;
else if (!strcmp(opt, "noauth")) noauth = 1;
}
tok_fini(&tok);
}
}
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err = getaddrinfo(host, service, &hints, &res0);
if (err) {
syslog(LOG_ERR, "getaddrinfo(%s) failed: %s",
server, gai_strerror(err));
goto error;
}
}
for (res = res0; res; res = res->ai_next) {
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (sock < 0)
continue;
/* Do a non-blocking connect() */
nonblock(sock, 1);
if (!connect(sock, res->ai_addr, res->ai_addrlen)) {
/* connect() succeeded immediately */
break;
}
else if (errno == EINPROGRESS) {
/* connect() in progress */
int n;
fd_set wfds, rfds;
time_t now = time(NULL);
time_t timeout = now + config_getint(IMAPOPT_CLIENT_TIMEOUT);
struct timeval waitfor;
/* select() socket for writing until we succeed, fail, or timeout */
do {
FD_ZERO(&wfds);
FD_SET(sock, &wfds);
rfds = wfds;
waitfor.tv_sec = timeout - now;
waitfor.tv_usec = 0;
n = select(sock + 1, &rfds, &wfds, NULL, &waitfor);
now = time(NULL);
/* Retry select() if interrupted */
} while (n < 0 && errno == EINTR && now < timeout);
if (!n) {
/* select() timed out */
errno = ETIMEDOUT;
}
else if (FD_ISSET(sock, &rfds) || FD_ISSET(sock, &wfds)) {
/* Socket is ready for I/O - get SO_ERROR to determine status */
socklen_t errlen = sizeof(err);
if (!getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &errlen) &&
!(errno = err)) {
/* connect() succeeded */
break;
}
}
}
close(sock);
sock = -1;
}
if (sock < 0) {
if (res0 != &hints) freeaddrinfo(res0);
syslog(LOG_ERR, "connect(%s) failed: %m", server);
goto error;
}
/* Reset socket to blocking */
nonblock(sock, 0);
memcpy(&ret->addr, res->ai_addr, res->ai_addrlen);
if (res0 != &hints)
freeaddrinfo(res0);
ret->in = prot_new(sock, 0);
ret->out = prot_new(sock, 1);
ret->sock = sock;
prot_settimeout(ret->in, config_getint(IMAPOPT_CLIENT_TIMEOUT));
prot_setflushonread(ret->in, ret->out);
ret->prot = prot;
/* use literal+ to send literals */
prot_setisclient(ret->in, 1);
prot_setisclient(ret->out, 1);
/* Start TLS if required */
if (do_tls) r = backend_starttls(ret, NULL, NULL, NULL);
/* Login to the server */
if (prot->type == TYPE_SPEC)
r = prot->u.spec.login(ret, userid, cb, auth_status, noauth);
else
r = backend_login(ret, userid, cb, auth_status, noauth);
if (r) goto error;
if (logfd >= 0) {
prot_setlog(ret->in, logfd);
prot_setlog(ret->out, logfd);
}
else prot_settimeout(ret->in, 0);
return ret;
error:
forget_capabilities(ret);
if (ret->in) {
prot_free(ret->in);
ret->in = NULL;
}
if (ret->out) {
prot_free(ret->out);
ret->out = NULL;
}
if (sock >= 0)
close(sock);
if (ret->saslconn) {
sasl_dispose(&ret->saslconn);
ret->saslconn = NULL;
}
if (!ret_backend)
free(ret);
return NULL;
}
