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With gssencmode='require', check credential cache before connecting

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Previously, libpq would establish the TCP connection, and then
immediately disconnect if the credentials were not available.  The
same thing happened if you tried to use a Unix domain socket with
gssencmode=require. Check those conditions before establishing the TCP
connection.

This is a very minor issue, but my motivation to do this now is that
I'm about to add more detail to the tests for encryption negotiation.
This makes the case of gssencmode=require but no credentials
configured fail at the same stage as with gssencmode=require and
GSSAPI support not compiled at all. That avoids having to deal with
variations in expected output depending on build options.

Discussion: https://www.postgresql.org/message-id/CAEze2Wja8VUoZygCepwUeiCrWa4jP316k0mvJrOW4PFmWP0Tcw@mail.gmail.com
This commit is contained in:
Heikki Linnakangas 2024-04-08 02:49:35 +03:00
parent 1169920ff7
commit 20f9b61cc1
1 changed files with 30 additions and 2 deletions
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32
src/interfaces/libpq/fe-connect.c
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@ -2855,6 +2855,33 @@ keep_going: /* We will come back to here until there is
/* Remember current address for possible use later */
memcpy(&conn->raddr, &addr_cur->addr, sizeof(SockAddr));
#ifdef ENABLE_GSS
/*
* Before establishing the connection, check if it's
* doomed to fail because gssencmode='require' but GSSAPI
* is not available.
*/
if (conn->gssencmode[0] == 'r')
{
if (conn->raddr.addr.ss_family == AF_UNIX)
{
libpq_append_conn_error(conn,
"GSSAPI encryption required but it is not supported over a local socket)");
goto error_return;
}
if (conn->gcred == GSS_C_NO_CREDENTIAL)
{
if (!pg_GSS_have_cred_cache(&conn->gcred))
{
libpq_append_conn_error(conn,
"GSSAPI encryption required but no credential cache");
goto error_return;
}
}
}
#endif
/*
* Set connip, too. Note we purposely ignore strdup
* failure; not a big problem if it fails.
@ -3218,7 +3245,7 @@ keep_going: /* We will come back to here until there is
* for GSSAPI Encryption (and skip past SSL negotiation and
* regular startup below).
*/
if (conn->try_gss && !conn->gctx)
if (conn->try_gss && !conn->gctx && conn->gcred == GSS_C_NO_CREDENTIAL)
conn->try_gss = pg_GSS_have_cred_cache(&conn->gcred);
if (conn->try_gss && !conn->gctx)
{
@ -3237,8 +3264,9 @@ keep_going: /* We will come back to here until there is
}
else if (!conn->gctx && conn->gssencmode[0] == 'r')
{
/* XXX: shouldn't happen */
libpq_append_conn_error(conn,
"GSSAPI encryption required but was impossible (possibly no credential cache, no server support, or using a local socket)");
"GSSAPI encryption required but was impossible");
goto error_return;
}
#endif