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Fix some null pointer dereferences in LDAP auth code 

An LDAP URL without a host name such as "ldap://" or without a base DN
such as "ldap://localhost" would cause a crash when reading pg_hba.conf.

If no binddn is configured, an error message might end up trying to print a
null pointer, which could crash on some platforms.

Author: Thomas Munro <thomas.munro@enterprisedb.com>
Reviewed-by: Michael Paquier <michael.paquier@gmail.com>
This commit is contained in:
Peter Eisentraut 2017-11-10 14:21:32 -05:00
parent 0e1539ba0d
commit 0c98d0dd5c
2 changed files with 6 additions and 3 deletions
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3
src/backend/libpq/auth.c
View File

@ -2520,7 +2520,8 @@ CheckLDAPAuth(Port *port)
{
ereport(LOG,
(errmsg("could not perform initial LDAP bind for ldapbinddn \"%s\" on server \"%s\": %s",
port->hba->ldapbinddn, port->hba->ldapserver,
port->hba->ldapbinddn ? port->hba->ldapbinddn : "",
port->hba->ldapserver,
ldap_err2string(r)),
errdetail_for_ldap(ldap)));
ldap_unbind(ldap);

6
src/backend/libpq/hba.c
View File

@ -1739,9 +1739,11 @@ parse_hba_auth_opt(char *name, char *val, HbaLine *hbaline,
return false;
}
hbaline->ldapserver = pstrdup(urldata->lud_host);
if (urldata->lud_host)
hbaline->ldapserver = pstrdup(urldata->lud_host);
hbaline->ldapport = urldata->lud_port;
hbaline->ldapbasedn = pstrdup(urldata->lud_dn);
if (urldata->lud_dn)
hbaline->ldapbasedn = pstrdup(urldata->lud_dn);
if (urldata->lud_attrs)
hbaline->ldapsearchattribute = pstrdup(urldata->lud_attrs[0]); /* only use first one */