static XSASL_SERVER *xsasl_dovecot_server_create(XSASL_SERVER_IMPL *impl,
XSASL_SERVER_CREATE_ARGS *args)
{
const char *myname = "xsasl_dovecot_server_create";
XSASL_DOVECOT_SERVER *server;
struct sockaddr_storage ss;
struct sockaddr *sa = (struct sockaddr *) &ss;
SOCKADDR_SIZE salen;
MAI_HOSTADDR_STR server_addr;
if (msg_verbose)
msg_info("%s: SASL service=%s, realm=%s",
myname, args->service, args->user_realm ?
args->user_realm : "(null)");
/*
* Extend the XSASL_SERVER_IMPL object with our own data. We use
* long-lived conversion buffers rather than local variables to avoid
* memory leaks in case of read/write timeout or I/O error.
*/
server = (XSASL_DOVECOT_SERVER *) mymalloc(sizeof(*server));
server->xsasl.free = xsasl_dovecot_server_free;
server->xsasl.first = xsasl_dovecot_server_first;
server->xsasl.next = xsasl_dovecot_server_next;
server->xsasl.get_mechanism_list = xsasl_dovecot_server_get_mechanism_list;
server->xsasl.get_username = xsasl_dovecot_server_get_username;
server->impl = (XSASL_DOVECOT_SERVER_IMPL *) impl;
server->sasl_line = vstring_alloc(256);
server->username = 0;
server->service = mystrdup(args->service);
server->last_request_id = 0;
server->mechanism_list = 0;
server->mechanism_argv = 0;
server->tls_flag = args->tls_flag;
server->sec_props =
name_mask_opt(myname, xsasl_dovecot_conf_sec_props,
args->security_options,
NAME_MASK_ANY_CASE | NAME_MASK_FATAL);
server->client_addr = mystrdup(args->client_addr);
/*
* XXX Temporary code until smtpd_peer.c is updated.
*/
if (args->server_addr && *args->server_addr) {
server->server_addr = mystrdup(args->server_addr);
} else {
salen = sizeof(ss);
if (getsockname(vstream_fileno(args->stream), sa, &salen) < 0
|| sockaddr_to_hostaddr(sa, salen, &server_addr, 0, 0) != 0)
server_addr.buf[0] = 0;
server->server_addr = mystrdup(server_addr.buf);
}
return (&server->xsasl);
}
static int psc_sockaddr_to_hostaddr(struct sockaddr * addr_storage,
SOCKADDR_SIZE addr_storage_len,
MAI_HOSTADDR_STR *addr_buf,
MAI_SERVPORT_STR *port_buf,
int socktype)
{
int aierr;
if ((aierr = sockaddr_to_hostaddr(addr_storage, addr_storage_len,
addr_buf, port_buf, socktype)) == 0
&& strncasecmp("::ffff:", addr_buf->buf, 7) == 0
&& strchr((char *) proto_info->sa_family_list, AF_INET) != 0)
memmove(addr_buf->buf, addr_buf->buf + 7,
sizeof(addr_buf->buf) - 7);
return (aierr);
}
void smtpd_peer_init(SMTPD_STATE *state)
{
const char *myname = "smtpd_peer_init";
SOCKADDR_SIZE sa_length;
struct sockaddr *sa;
INET_PROTO_INFO *proto_info = inet_proto_info();
sa = (struct sockaddr *) & (state->sockaddr);
sa_length = sizeof(state->sockaddr);
/*
* Look up the peer address information.
*
* XXX If we make local endpoint (getsockname) information available to
* Milter applications as {if_name} and {if_addr}, then we also must be
* able to provide this via the XCLIENT command for Milter testing.
*
* XXX If we make local or remote port information available to policy
* servers or Milter applications, then we must also make this testable
* with the XCLIENT command, otherwise there will be confusion.
*
* XXX If we make local or remote port information available via logging,
* then we must also support these attributes with the XFORWARD command.
*
* XXX If support were to be added for Milter applications in down-stream
* MTAs, then consistency demands that we propagate a lot of Sendmail
* macro information via the XFORWARD command. Otherwise we could end up
* with a very confusing situation.
*/
if (getpeername(vstream_fileno(state->client), sa, &sa_length) >= 0) {
errno = 0;
}
/*
* If peer went away, give up.
*/
if (errno != 0 && errno != ENOTSOCK) {
state->name = mystrdup(CLIENT_NAME_UNKNOWN);
state->reverse_name = mystrdup(CLIENT_NAME_UNKNOWN);
state->addr = mystrdup(CLIENT_ADDR_UNKNOWN);
state->rfc_addr = mystrdup(CLIENT_ADDR_UNKNOWN);
state->addr_family = AF_UNSPEC;
state->name_status = SMTPD_PEER_CODE_PERM;
state->reverse_name_status = SMTPD_PEER_CODE_PERM;
state->port = mystrdup(CLIENT_PORT_UNKNOWN);
}
/*
* Convert the client address to printable address and hostname.
*
* XXX If we're given an IPv6 (or IPv4) connection from, e.g., inetd, while
* Postfix IPv6 (or IPv4) support is turned off, don't (skip to the final
* else clause, pretend the origin is localhost[127.0.0.1], and become an
* open relay).
*/
else if (errno == 0
&& (sa->sa_family == AF_INET
#ifdef AF_INET6
|| sa->sa_family == AF_INET6
#endif
)) {
MAI_HOSTNAME_STR client_name;
MAI_HOSTADDR_STR client_addr;
MAI_SERVPORT_STR client_port;
int aierr;
char *colonp;
/*
* Sanity check: we can't use sockets that we're not configured for.
*/
if (strchr((char *) proto_info->sa_family_list, sa->sa_family) == 0)
msg_fatal("cannot handle socket type %s with \"%s = %s\"",
#ifdef AF_INET6
sa->sa_family == AF_INET6 ? "AF_INET6" :
#endif
sa->sa_family == AF_INET ? "AF_INET" :
"other", VAR_INET_PROTOCOLS, var_inet_protocols);
/*
* Sorry, but there are some things that we just cannot do while
* connected to the network.
*/
if (geteuid() != var_owner_uid || getuid() != var_owner_uid) {
msg_error("incorrect SMTP server privileges: uid=%lu euid=%lu",
(unsigned long) getuid(), (unsigned long) geteuid());
msg_fatal("the Postfix SMTP server must run with $%s privileges",
VAR_MAIL_OWNER);
}
/*
* Convert the client address to printable form.
*/
if ((aierr = sockaddr_to_hostaddr(sa, sa_length, &client_addr,
&client_port, 0)) != 0)
msg_fatal("%s: cannot convert client address/port to string: %s",
myname, MAI_STRERROR(aierr));
state->port = mystrdup(client_port.buf);
/*
* XXX Strip off the IPv6 datalink suffix to avoid false alarms with
* strict address syntax checks.
*/
#ifdef HAS_IPV6
(void) split_at(client_addr.buf, '%');
#endif
/*
* We convert IPv4-in-IPv6 address to 'true' IPv4 address early on,
* but only if IPv4 support is enabled (why would anyone want to turn
* it off)? With IPv4 support enabled we have no need for the IPv6
* form in logging, hostname verification and access checks.
*/
#ifdef HAS_IPV6
if (sa->sa_family == AF_INET6) {
if (strchr((char *) proto_info->sa_family_list, AF_INET) != 0
&& IN6_IS_ADDR_V4MAPPED(&SOCK_ADDR_IN6_ADDR(sa))
&& (colonp = strrchr(client_addr.buf, ':')) != 0) {
struct addrinfo *res0;
if (msg_verbose > 1)
msg_info("%s: rewriting V4-mapped address \"%s\" to \"%s\"",
myname, client_addr.buf, colonp + 1);
state->addr = mystrdup(colonp + 1);
state->rfc_addr = mystrdup(colonp + 1);
state->addr_family = AF_INET;
aierr = hostaddr_to_sockaddr(state->addr, (char *) 0, 0, &res0);
if (aierr)
msg_fatal("%s: cannot convert %s from string to binary: %s",
myname, state->addr, MAI_STRERROR(aierr));
sa_length = res0->ai_addrlen;
if (sa_length > sizeof(state->sockaddr))
sa_length = sizeof(state->sockaddr);
memcpy((char *) sa, res0->ai_addr, sa_length);
freeaddrinfo(res0); /* 200412 */
}
/*
* Following RFC 2821 section 4.1.3, an IPv6 address literal gets
* a prefix of 'IPv6:'. We do this consistently for all IPv6
* addresses that that appear in headers or envelopes. The fact
* that valid_mailhost_addr() enforces the form helps of course.
* We use the form without IPV6: prefix when doing access
* control, or when accessing the connection cache.
*/
else {
state->addr = mystrdup(client_addr.buf);
state->rfc_addr =
concatenate(IPV6_COL, client_addr.buf, (char *) 0);
state->addr_family = sa->sa_family;
}
}
/*
* An IPv4 address is in dotted quad decimal form.
*/
else
#endif
{
state->addr = mystrdup(client_addr.buf);
state->rfc_addr = mystrdup(client_addr.buf);
state->addr_family = sa->sa_family;
}
/*
* Look up and sanity check the client hostname.
*
* It is unsafe to allow numeric hostnames, especially because there
* exists pressure to turn off the name->addr double check. In that
* case an attacker could trivally bypass access restrictions.
*
* sockaddr_to_hostname() already rejects malformed or numeric names.
*/
#define TEMP_AI_ERROR(e) \
((e) == EAI_AGAIN || (e) == EAI_MEMORY || (e) == EAI_SYSTEM)
#define REJECT_PEER_NAME(state, code) { \
myfree(state->name); \
state->name = mystrdup(CLIENT_NAME_UNKNOWN); \
state->name_status = code; \
}
if (var_smtpd_peername_lookup == 0) {
state->name = mystrdup(CLIENT_NAME_UNKNOWN);
state->reverse_name = mystrdup(CLIENT_NAME_UNKNOWN);
state->name_status = SMTPD_PEER_CODE_PERM;
state->reverse_name_status = SMTPD_PEER_CODE_PERM;
} else if ((aierr = sockaddr_to_hostname(sa, sa_length, &client_name,
(MAI_SERVNAME_STR *) 0, 0)) != 0) {
state->name = mystrdup(CLIENT_NAME_UNKNOWN);
state->reverse_name = mystrdup(CLIENT_NAME_UNKNOWN);
state->name_status = (TEMP_AI_ERROR(aierr) ?
SMTPD_PEER_CODE_TEMP : SMTPD_PEER_CODE_PERM);
state->reverse_name_status = (TEMP_AI_ERROR(aierr) ?
SMTPD_PEER_CODE_TEMP : SMTPD_PEER_CODE_PERM);
} else {
struct addrinfo *res0;
struct addrinfo *res;
state->name = mystrdup(client_name.buf);
state->reverse_name = mystrdup(client_name.buf);
state->name_status = SMTPD_PEER_CODE_OK;
state->reverse_name_status = SMTPD_PEER_CODE_OK;
/*
* Reject the hostname if it does not list the peer address.
* Without further validation or qualification, such information
* must not be allowed to enter the audit trail, as people would
* draw false conclusions.
*/
aierr = hostname_to_sockaddr_pf(state->name, state->addr_family,
(char *) 0, 0, &res0);
if (aierr) {
msg_warn("%s: hostname %s verification failed: %s",
state->addr, state->name, MAI_STRERROR(aierr));
REJECT_PEER_NAME(state, (TEMP_AI_ERROR(aierr) ?
SMTPD_PEER_CODE_TEMP : SMTPD_PEER_CODE_FORGED));
} else {
for (res = res0; /* void */ ; res = res->ai_next) {
if (res == 0) {
msg_warn("%s: address not listed for hostname %s",
state->addr, state->name);
REJECT_PEER_NAME(state, SMTPD_PEER_CODE_FORGED);
break;
}
if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) {
msg_info("skipping address family %d for host %s",
res->ai_family, state->name);
continue;
}
if (sock_addr_cmp_addr(res->ai_addr, sa) == 0)
break; /* keep peer name */
}
freeaddrinfo(res0);
}
}
}
/*
* If it's not Internet, assume the client is local, and avoid using the
* naming service because that can hang when the machine is disconnected.
*/
else {
state->name = mystrdup("localhost");
state->reverse_name = mystrdup("localhost");
state->addr = mystrdup("127.0.0.1"); /* XXX bogus. */
state->rfc_addr = mystrdup("127.0.0.1");/* XXX bogus. */
state->addr_family = AF_UNSPEC;
state->name_status = SMTPD_PEER_CODE_OK;
state->reverse_name_status = SMTPD_PEER_CODE_OK;
state->port = mystrdup("0"); /* XXX bogus. */
}
/*
* Do the name[addr]:port formatting for pretty reports.
*/
state->namaddr = SMTPD_BUILD_NAMADDRPORT(state->name, state->addr,
state->port);
}
static void psc_service(VSTREAM *smtp_client_stream,
char *unused_service,
char **unused_argv)
{
const char *myname = "psc_service";
PSC_STATE *state;
struct sockaddr_storage addr_storage;
SOCKADDR_SIZE addr_storage_len = sizeof(addr_storage);
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 aierr;
const char *stamp_str;
int saved_flags;
/*
* For sanity, require that at least one of INET or INET6 is enabled.
* Otherwise, we can't look up interface information, and we can't
* convert names or addresses.
*/
if (inet_proto_info()->ai_family_list[0] == 0)
msg_fatal("all network protocols are disabled (%s = %s)",
VAR_INET_PROTOCOLS, var_inet_protocols);
/*
* This program handles all incoming connections, so it must not block.
* We use event-driven code for all operations that introduce latency.
*
* Note: instead of using VSTREAM-level timeouts, we enforce limits on the
* total amount of time to receive a complete SMTP command line.
*/
non_blocking(vstream_fileno(smtp_client_stream), NON_BLOCKING);
/*
* We use the event_server framework. This means we get already-accepted
* connections so we have to invoke getpeername() to find out the remote
* address and port.
*/
/* Best effort - if this non-blocking write(2) fails, so be it. */
#define PSC_SERVICE_DISCONNECT_AND_RETURN(stream) do { \
(void) write(vstream_fileno(stream), \
"421 4.3.2 No system resources\r\n", \
sizeof("421 4.3.2 No system resources\r\n") - 1); \
event_server_disconnect(stream); \
return; \
} while (0);
/*
* Look up the remote SMTP client address and port.
*/
if (getpeername(vstream_fileno(smtp_client_stream), (struct sockaddr *)
& addr_storage, &addr_storage_len) < 0) {
msg_warn("getpeername: %m -- dropping this connection");
PSC_SERVICE_DISCONNECT_AND_RETURN(smtp_client_stream);
}
/*
* Convert the remote SMTP client address and port to printable form for
* logging and access control.
*/
if ((aierr = sockaddr_to_hostaddr((struct sockaddr *) & addr_storage,
addr_storage_len, &smtp_client_addr,
&smtp_client_port, 0)) != 0) {
msg_warn("cannot convert client address/port to string: %s"
" -- dropping this connection",
MAI_STRERROR(aierr));
PSC_SERVICE_DISCONNECT_AND_RETURN(smtp_client_stream);
}
if (strncasecmp("::ffff:", smtp_client_addr.buf, 7) == 0)
memmove(smtp_client_addr.buf, smtp_client_addr.buf + 7,
sizeof(smtp_client_addr.buf) - 7);
if (msg_verbose > 1)
msg_info("%s: sq=%d cq=%d connect from [%s]:%s",
myname, psc_post_queue_length, psc_check_queue_length,
smtp_client_addr.buf, smtp_client_port.buf);
/*
* Look up the local SMTP server address and port.
*/
if (getsockname(vstream_fileno(smtp_client_stream), (struct sockaddr *)
& addr_storage, &addr_storage_len) < 0) {
msg_warn("getsockname: %m -- dropping this connection");
PSC_SERVICE_DISCONNECT_AND_RETURN(smtp_client_stream);
}
/*
* Convert the local SMTP server address and port to printable form for
* logging and access control.
*/
if ((aierr = sockaddr_to_hostaddr((struct sockaddr *) & addr_storage,
addr_storage_len, &smtp_server_addr,
&smtp_server_port, 0)) != 0) {
msg_warn("cannot convert server address/port to string: %s"
" -- dropping this connection",
MAI_STRERROR(aierr));
PSC_SERVICE_DISCONNECT_AND_RETURN(smtp_client_stream);
}
if (strncasecmp("::ffff:", smtp_server_addr.buf, 7) == 0)
memmove(smtp_server_addr.buf, smtp_server_addr.buf + 7,
sizeof(smtp_server_addr.buf) - 7);
msg_info("CONNECT from [%s]:%s to [%s]:%s",
smtp_client_addr.buf, smtp_client_port.buf,
smtp_server_addr.buf, smtp_server_port.buf);
/*
* Bundle up all the loose session pieces. This zeroes all flags and time
* stamps.
*/
state = psc_new_session_state(smtp_client_stream, smtp_client_addr.buf,
smtp_client_port.buf);
/*
* Reply with 421 when the client has too many open connections.
*/
if (var_psc_cconn_limit > 0
&& state->client_concurrency > var_psc_cconn_limit) {
msg_info("NOQUEUE: reject: CONNECT from [%s]:%s: too many connections",
state->smtp_client_addr, state->smtp_client_port);
PSC_DROP_SESSION_STATE(state,
"421 4.7.0 Error: too many connections\r\n");
return;
}
/*
* Reply with 421 when we can't forward more connections.
*/
if (var_psc_post_queue_limit > 0
&& psc_post_queue_length >= var_psc_post_queue_limit) {
msg_info("NOQUEUE: reject: CONNECT from [%s]:%s: all server ports busy",
state->smtp_client_addr, state->smtp_client_port);
PSC_DROP_SESSION_STATE(state,
"421 4.3.2 All server ports are busy\r\n");
return;
}
/*
* The permanent white/blacklist has highest precedence.
*/
if (psc_acl != 0) {
switch (psc_acl_eval(state, psc_acl, VAR_PSC_ACL)) {
/*
* Permanently blacklisted.
*/
case PSC_ACL_ACT_BLACKLIST:
msg_info("BLACKLISTED [%s]:%s", PSC_CLIENT_ADDR_PORT(state));
PSC_FAIL_SESSION_STATE(state, PSC_STATE_FLAG_BLIST_FAIL);
switch (psc_blist_action) {
case PSC_ACT_DROP:
PSC_DROP_SESSION_STATE(state,
"521 5.3.2 Service currently unavailable\r\n");
return;
case PSC_ACT_ENFORCE:
PSC_ENFORCE_SESSION_STATE(state,
"550 5.3.2 Service currently unavailable\r\n");
break;
case PSC_ACT_IGNORE:
PSC_UNFAIL_SESSION_STATE(state, PSC_STATE_FLAG_BLIST_FAIL);
/*
* Not: PSC_PASS_SESSION_STATE. Repeat this test the next
* time.
*/
break;
default:
msg_panic("%s: unknown blacklist action value %d",
myname, psc_blist_action);
}
break;
/*
* Permanently whitelisted.
*/
case PSC_ACL_ACT_WHITELIST:
msg_info("WHITELISTED [%s]:%s", PSC_CLIENT_ADDR_PORT(state));
psc_conclude(state);
return;
/*
* Other: dunno (don't know) or error.
*/
default:
break;
}
}
/*
* The temporary whitelist (i.e. the postscreen cache) has the lowest
* precedence. This cache contains information about the results of prior
* tests. Whitelist the client when all enabled test results are still
* valid.
*/
if ((state->flags & PSC_STATE_MASK_ANY_FAIL) == 0
&& psc_cache_map != 0
&& (stamp_str = psc_cache_lookup(psc_cache_map, state->smtp_client_addr)) != 0) {
saved_flags = state->flags;
psc_parse_tests(state, stamp_str, event_time());
state->flags |= saved_flags;
if (msg_verbose)
msg_info("%s: cached + recent flags: %s",
myname, psc_print_state_flags(state->flags, myname));
if ((state->flags & PSC_STATE_MASK_ANY_TODO_FAIL) == 0) {
msg_info("PASS OLD [%s]:%s", PSC_CLIENT_ADDR_PORT(state));
psc_conclude(state);
return;
}
} else {
saved_flags = state->flags;
psc_new_tests(state);
state->flags |= saved_flags;
if (msg_verbose)
msg_info("%s: new + recent flags: %s",
myname, psc_print_state_flags(state->flags, myname));
}
/*
* Don't whitelist clients that connect to backup MX addresses. Fail
* "closed" on error.
*/
if (addr_match_list_match(psc_wlist_if, smtp_server_addr.buf) == 0) {
state->flags |= (PSC_STATE_FLAG_WLIST_FAIL | PSC_STATE_FLAG_NOFORWARD);
msg_info("WHITELIST VETO [%s]:%s", PSC_CLIENT_ADDR_PORT(state));
}
/*
* Reply with 421 when we can't analyze more connections. That also means
* no deep protocol tests when the noforward flag is raised.
*/
if (var_psc_pre_queue_limit > 0
&& psc_check_queue_length - psc_post_queue_length
>= var_psc_pre_queue_limit) {
msg_info("reject: connect from [%s]:%s: all screening ports busy",
state->smtp_client_addr, state->smtp_client_port);
PSC_DROP_SESSION_STATE(state,
"421 4.3.2 All screening ports are busy\r\n");
return;
}
/*
* If the client has no up-to-date results for some tests, do those tests
* first. Otherwise, skip the tests and hand off the connection.
*/
if (state->flags & PSC_STATE_MASK_EARLY_TODO)
psc_early_tests(state);
else if (state->flags & (PSC_STATE_MASK_SMTPD_TODO | PSC_STATE_FLAG_NOFORWARD))
psc_smtpd_tests(state);
else
psc_conclude(state);
}
static int smtpd_peer_sockaddr_to_hostaddr(SMTPD_STATE *state)
{
const char *myname = "smtpd_peer_sockaddr_to_hostaddr";
struct sockaddr *sa = (struct sockaddr *) &(state->sockaddr);
SOCKADDR_SIZE sa_length = state->sockaddr_len;
/*
* XXX If we're given an IPv6 (or IPv4) connection from, e.g., inetd,
* while Postfix IPv6 (or IPv4) support is turned off, don't (skip to the
* final else clause, pretend the origin is localhost[127.0.0.1], and
* become an open relay).
*/
if (sa->sa_family == AF_INET
#ifdef AF_INET6
|| sa->sa_family == AF_INET6
#endif
) {
MAI_HOSTADDR_STR client_addr;
MAI_SERVPORT_STR client_port;
int aierr;
char *colonp;
/*
* Sanity check: we can't use sockets that we're not configured for.
*/
if (strchr((char *) proto_info->sa_family_list, sa->sa_family) == 0)
msg_fatal("cannot handle socket type %s with \"%s = %s\"",
#ifdef AF_INET6
sa->sa_family == AF_INET6 ? "AF_INET6" :
#endif
sa->sa_family == AF_INET ? "AF_INET" :
"other", VAR_INET_PROTOCOLS, var_inet_protocols);
/*
* Sorry, but there are some things that we just cannot do while
* connected to the network.
*/
if (geteuid() != var_owner_uid || getuid() != var_owner_uid) {
msg_error("incorrect SMTP server privileges: uid=%lu euid=%lu",
(unsigned long) getuid(), (unsigned long) geteuid());
msg_fatal("the Postfix SMTP server must run with $%s privileges",
VAR_MAIL_OWNER);
}
/*
* Convert the client address to printable form.
*/
if ((aierr = sockaddr_to_hostaddr(sa, sa_length, &client_addr,
&client_port, 0)) != 0)
msg_fatal("%s: cannot convert client address/port to string: %s",
myname, MAI_STRERROR(aierr));
state->port = mystrdup(client_port.buf);
/*
* XXX Require that the infrastructure strips off the IPv6 datalink
* suffix to avoid false alarms with strict address syntax checks.
*/
#ifdef HAS_IPV6
if (strchr(client_addr.buf, '%') != 0)
msg_panic("%s: address %s has datalink suffix",
myname, client_addr.buf);
#endif
/*
* We convert IPv4-in-IPv6 address to 'true' IPv4 address early on,
* but only if IPv4 support is enabled (why would anyone want to turn
* it off)? With IPv4 support enabled we have no need for the IPv6
* form in logging, hostname verification and access checks.
*/
#ifdef HAS_IPV6
if (sa->sa_family == AF_INET6) {
if (strchr((char *) proto_info->sa_family_list, AF_INET) != 0
&& IN6_IS_ADDR_V4MAPPED(&SOCK_ADDR_IN6_ADDR(sa))
&& (colonp = strrchr(client_addr.buf, ':')) != 0) {
struct addrinfo *res0;
if (msg_verbose > 1)
msg_info("%s: rewriting V4-mapped address \"%s\" to \"%s\"",
myname, client_addr.buf, colonp + 1);
state->addr = mystrdup(colonp + 1);
state->rfc_addr = mystrdup(colonp + 1);
state->addr_family = AF_INET;
aierr = hostaddr_to_sockaddr(state->addr, (char *) 0, 0, &res0);
if (aierr)
msg_fatal("%s: cannot convert %s from string to binary: %s",
myname, state->addr, MAI_STRERROR(aierr));
sa_length = res0->ai_addrlen;
if (sa_length > sizeof(state->sockaddr))
sa_length = sizeof(state->sockaddr);
memcpy((void *) sa, res0->ai_addr, sa_length);
freeaddrinfo(res0); /* 200412 */
}
/*
* Following RFC 2821 section 4.1.3, an IPv6 address literal gets
* a prefix of 'IPv6:'. We do this consistently for all IPv6
* addresses that that appear in headers or envelopes. The fact
* that valid_mailhost_addr() enforces the form helps of course.
* We use the form without IPV6: prefix when doing access
* control, or when accessing the connection cache.
*/
else {
state->addr = mystrdup(client_addr.buf);
state->rfc_addr =
concatenate(IPV6_COL, client_addr.buf, (char *) 0);
state->addr_family = sa->sa_family;
}
}
/*
* An IPv4 address is in dotted quad decimal form.
*/
else
#endif
{
state->addr = mystrdup(client_addr.buf);
state->rfc_addr = mystrdup(client_addr.buf);
state->addr_family = sa->sa_family;
}
return (0);
}
/*
* It's not Internet.
*/
else {
return (-1);
}
}
void qmqpd_peer_init(QMQPD_STATE *state)
{
const char *myname = "qmqpd_peer_init";
struct sockaddr_storage ss;
struct sockaddr *sa;
SOCKADDR_SIZE sa_length;
INET_PROTO_INFO *proto_info = inet_proto_info();
sa = (struct sockaddr *) & ss;
sa_length = sizeof(ss);
/*
* Look up the peer address information.
*/
if (getpeername(vstream_fileno(state->client), sa, &sa_length) >= 0) {
errno = 0;
}
/*
* If peer went away, give up.
*/
if (errno != 0 && errno != ENOTSOCK) {
state->name = mystrdup(CLIENT_NAME_UNKNOWN);
state->addr = mystrdup(CLIENT_ADDR_UNKNOWN);
state->rfc_addr = mystrdup(CLIENT_ADDR_UNKNOWN);
state->addr_family = AF_UNSPEC;
state->port = mystrdup(CLIENT_PORT_UNKNOWN);
}
/*
* Convert the client address to printable address and hostname.
*
* XXX If we're given an IPv6 (or IPv4) connection from, e.g., inetd, while
* Postfix IPv6 (or IPv4) support is turned off, don't (skip to the final
* else clause, pretend the origin is localhost[127.0.0.1], and become an
* open relay).
*/
else if (errno == 0
&& (sa->sa_family == AF_INET
#ifdef AF_INET6
|| sa->sa_family == AF_INET6
#endif
)) {
MAI_HOSTNAME_STR client_name;
MAI_HOSTADDR_STR client_addr;
MAI_SERVPORT_STR client_port;
int aierr;
char *colonp;
/*
* Sanity check: we can't use sockets that we're not configured for.
*/
if (strchr((char *) proto_info->sa_family_list, sa->sa_family) == 0)
msg_fatal("cannot handle socket type %s with \"%s = %s\"",
#ifdef AF_INET6
sa->sa_family == AF_INET6 ? "AF_INET6" :
#endif
sa->sa_family == AF_INET ? "AF_INET" :
"other", VAR_INET_PROTOCOLS, var_inet_protocols);
/*
* Sorry, but there are some things that we just cannot do while
* connected to the network.
*/
if (geteuid() != var_owner_uid || getuid() != var_owner_uid) {
msg_error("incorrect QMQP server privileges: uid=%lu euid=%lu",
(unsigned long) getuid(), (unsigned long) geteuid());
msg_fatal("the Postfix QMQP server must run with $%s privileges",
VAR_MAIL_OWNER);
}
/*
* Convert the client address to printable form.
*/
if ((aierr = sockaddr_to_hostaddr(sa, sa_length, &client_addr,
&client_port, 0)) != 0)
msg_fatal("%s: cannot convert client address/port to string: %s",
myname, MAI_STRERROR(aierr));
state->port = mystrdup(client_port.buf);
/*
* XXX Require that the infrastructure strips off the IPv6 datalink
* suffix to avoid false alarms with strict address syntax checks.
*/
#ifdef HAS_IPV6
if (strchr(client_addr.buf, '%') != 0)
msg_panic("%s: address %s has datalink suffix",
myname, client_addr.buf);
#endif
/*
* We convert IPv4-in-IPv6 address to 'true' IPv4 address early on,
* but only if IPv4 support is enabled (why would anyone want to turn
* it off)? With IPv4 support enabled we have no need for the IPv6
* form in logging, hostname verification and access checks.
*/
#ifdef HAS_IPV6
if (sa->sa_family == AF_INET6) {
if (strchr((char *) proto_info->sa_family_list, AF_INET) != 0
&& IN6_IS_ADDR_V4MAPPED(&SOCK_ADDR_IN6_ADDR(sa))
&& (colonp = strrchr(client_addr.buf, ':')) != 0) {
struct addrinfo *res0;
if (msg_verbose > 1)
msg_info("%s: rewriting V4-mapped address \"%s\" to \"%s\"",
myname, client_addr.buf, colonp + 1);
state->addr = mystrdup(colonp + 1);
state->rfc_addr = mystrdup(colonp + 1);
state->addr_family = AF_INET;
aierr = hostaddr_to_sockaddr(state->addr, (char *) 0, 0, &res0);
if (aierr)
msg_fatal("%s: cannot convert %s from string to binary: %s",
myname, state->addr, MAI_STRERROR(aierr));
sa_length = res0->ai_addrlen;
if (sa_length > sizeof(ss))
sa_length = sizeof(ss);
memcpy((char *) sa, res0->ai_addr, sa_length);
freeaddrinfo(res0);
}
/*
* Following RFC 2821 section 4.1.3, an IPv6 address literal gets
* a prefix of 'IPv6:'. We do this consistently for all IPv6
* addresses that that appear in headers or envelopes. The fact
* that valid_mailhost_addr() enforces the form helps of course.
* We use the form without IPV6: prefix when doing access
* control, or when accessing the connection cache.
*/
else {
state->addr = mystrdup(client_addr.buf);
state->rfc_addr =
concatenate(IPV6_COL, client_addr.buf, (char *) 0);
state->addr_family = sa->sa_family;
}
}
/*
* An IPv4 address is in dotted quad decimal form.
*/
else
#endif
{
state->addr = mystrdup(client_addr.buf);
state->rfc_addr = mystrdup(client_addr.buf);
state->addr_family = sa->sa_family;
}
/*
* Look up and sanity check the client hostname.
*
* It is unsafe to allow numeric hostnames, especially because there
* exists pressure to turn off the name->addr double check. In that
* case an attacker could trivally bypass access restrictions.
*
* sockaddr_to_hostname() already rejects malformed or numeric names.
*/
#define REJECT_PEER_NAME(state) { \
myfree(state->name); \
state->name = mystrdup(CLIENT_NAME_UNKNOWN); \
}
if ((aierr = sockaddr_to_hostname(sa, sa_length, &client_name,
(MAI_SERVNAME_STR *) 0, 0)) != 0) {
state->name = mystrdup(CLIENT_NAME_UNKNOWN);
} else {
struct addrinfo *res0;
struct addrinfo *res;
state->name = mystrdup(client_name.buf);
/*
* Reject the hostname if it does not list the peer address.
*/
aierr = hostname_to_sockaddr_pf(state->name, state->addr_family,
(char *) 0, 0, &res0);
if (aierr) {
msg_warn("hostname %s does not resolve to address %s: %s",
state->name, state->addr, MAI_STRERROR(aierr));
REJECT_PEER_NAME(state);
} else {
for (res = res0; /* void */ ; res = res->ai_next) {
if (res == 0) {
msg_warn("hostname %s does not resolve to address %s",
state->addr, state->name);
REJECT_PEER_NAME(state);
break;
}
if (strchr((char *) proto_info->sa_family_list, res->ai_family) == 0) {
msg_info("skipping address family %d for host %s",
res->ai_family, state->name);
continue;
}
if (sock_addr_cmp_addr(res->ai_addr, sa) == 0)
break; /* keep peer name */
}
freeaddrinfo(res0);
}
}
}
/*
* If it's not Internet, assume the client is local, and avoid using the
* naming service because that can hang when the machine is disconnected.
*/
else {
state->name = mystrdup("localhost");
state->addr = mystrdup("127.0.0.1"); /* XXX bogus. */
state->rfc_addr = mystrdup("127.0.0.1");/* XXX bogus. */
state->addr_family = AF_UNSPEC;
state->port = mystrdup("0"); /* XXX bogus. */
}
/*
* Do the name[addr]:port formatting for pretty reports.
*/
state->namaddr =
concatenate(state->name, "[", state->addr, "]",
var_qmqpd_client_port_log ? ":" : (char *) 0,
state->port, (char *) 0);
}
