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libpq: Set LDAP protocol version 3

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Some LDAP servers reject the default version 2 protocol.  So set
version 3 before starting the connection.  This matches how the
backend LDAP code has worked all along.

Co-authored-by: Andrew Jackson <andrewjackson947@gmail.com>
Reviewed-by: Pavel Seleznev <pavel.seleznev@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/CAKK5BkHixcivSCA9pfd_eUp7wkLRhvQ6OtGLAYrWC%3Dk7E76LDQ%40mail.gmail.com
This commit is contained in:
Peter Eisentraut 2025-08-12 20:52:32 +02:00
parent b227b0bb4e
commit 5f19d13dfe
1 changed files with 10 additions and 0 deletions
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10
src/interfaces/libpq/fe-connect.c
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@ -5494,6 +5494,7 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
*entry; *entry;
struct berval **values; struct berval **values;
LDAP_TIMEVAL time = {PGLDAP_TIMEOUT, 0}; LDAP_TIMEVAL time = {PGLDAP_TIMEOUT, 0};
int ldapversion = LDAP_VERSION3;
if ((url = strdup(purl)) == NULL) if ((url = strdup(purl)) == NULL)
{ {
@ -5625,6 +5626,15 @@ ldapServiceLookup(const char *purl, PQconninfoOption *options,
return 3; return 3;
} }
if ((rc = ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &ldapversion)) != LDAP_SUCCESS)
{
libpq_append_error(errorMessage, "could not set LDAP protocol version: %s",
ldap_err2string(rc));
free(url);
ldap_unbind(ld);
return 3;
}
/* /*
* Perform an explicit anonymous bind. * Perform an explicit anonymous bind.
* *