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Don't set PAM_RHOST for Unix sockets.

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Since commit 2f1d2b7a we have set PAM_RHOST to "[local]" for Unix
sockets.  This caused Linux PAM's libaudit integration to make DNS
requests for that name.  It's not exactly clear what value PAM_RHOST
should have in that case, but it seems clear that we shouldn't set it
to an unresolvable name, so don't do that.

Back-patch to 9.6.  Bug #15520.

Author: Thomas Munro
Reviewed-by: Peter Eisentraut
Reported-by: Albert Schabhuetl
Discussion: https://postgr.es/m/15520-4c266f986998e1c5%40postgresql.org
This commit is contained in:
Thomas Munro 2018-11-28 14:00:57 +13:00
parent 4e7395d83f
commit 96ed0b8704
1 changed files with 30 additions and 20 deletions
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50
src/backend/libpq/auth.c
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@ -2158,18 +2158,6 @@ CheckPAMAuth(Port *port, char *user, char *password)
{
int retval;
pam_handle_t *pamh = NULL;
char hostinfo[NI_MAXHOST];
retval = pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen,
hostinfo, sizeof(hostinfo), NULL, 0,
port->hba->pam_use_hostname ? 0 : NI_NUMERICHOST | NI_NUMERICSERV);
if (retval != 0)
{
ereport(WARNING,
(errmsg_internal("pg_getnameinfo_all() failed: %s",
gai_strerror(retval))));
return STATUS_ERROR;
}
/*
* We can't entirely rely on PAM to pass through appdata --- it appears
@ -2215,15 +2203,37 @@ CheckPAMAuth(Port *port, char *user, char *password)
return STATUS_ERROR;
}
retval = pam_set_item(pamh, PAM_RHOST, hostinfo);
if (retval != PAM_SUCCESS)
if (port->hba->conntype != ctLocal)
{
ereport(LOG,
(errmsg("pam_set_item(PAM_RHOST) failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL;
return STATUS_ERROR;
char hostinfo[NI_MAXHOST];
int flags;
if (port->hba->pam_use_hostname)
flags = 0;
else
flags = NI_NUMERICHOST | NI_NUMERICSERV;
retval = pg_getnameinfo_all(&port->raddr.addr, port->raddr.salen,
hostinfo, sizeof(hostinfo), NULL, 0,
flags);
if (retval != 0)
{
ereport(WARNING,
(errmsg_internal("pg_getnameinfo_all() failed: %s",
gai_strerror(retval))));
return STATUS_ERROR;
}
retval = pam_set_item(pamh, PAM_RHOST, hostinfo);
if (retval != PAM_SUCCESS)
{
ereport(LOG,
(errmsg("pam_set_item(PAM_RHOST) failed: %s",
pam_strerror(pamh, retval))));
pam_passwd = NULL;
return STATUS_ERROR;
}
}
retval = pam_set_item(pamh, PAM_CONV, &pam_passw_conv);