From 25fe5ac45a736e50d2b85280a3cb0ce169f583f3 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Mon, 13 Jul 2020 11:57:55 -0400 Subject: [PATCH] Fix bugs in libpq's management of GSS encryption state. GSS-related resources should be cleaned up in pqDropConnection, not freePGconn, else the wrong things happen when resetting a connection or trying to switch to a different server. It's also critical to reset conn->gssenc there. During connection setup, initialize conn->try_gss at the correct place, else switching to a different server won't work right. Remove now-redundant cleanup of GSS resources around one (and, for some reason, only one) pqDropConnection call in connectDBStart. Per report from Kyotaro Horiguchi that psql would freeze up, rather than successfully resetting a GSS-encrypted connection after a server restart. This is YA oversight in commit b0b39f72b, so back-patch to v12. Discussion: https://postgr.es/m/20200710.173803.435804731896516388.horikyota.ntt@gmail.com --- src/interfaces/libpq/fe-connect.c | 37 ++++++++----------------------- 1 file changed, 9 insertions(+), 28 deletions(-) diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c index 27c9bb46ee..7bee9dd201 100644 --- a/src/interfaces/libpq/fe-connect.c +++ b/src/interfaces/libpq/fe-connect.c @@ -477,6 +477,11 @@ pqDropConnection(PGconn *conn, bool flushInput) { OM_uint32 min_s; + if (conn->gcred != GSS_C_NO_CREDENTIAL) + { + gss_release_cred(&min_s, &conn->gcred); + conn->gcred = GSS_C_NO_CREDENTIAL; + } if (conn->gctx) gss_delete_sec_context(&min_s, &conn->gctx, GSS_C_NO_BUFFER); if (conn->gtarg_nam) @@ -496,6 +501,7 @@ pqDropConnection(PGconn *conn, bool flushInput) free(conn->gss_ResultBuffer); conn->gss_ResultBuffer = NULL; } + conn->gssenc = false; } #endif #ifdef ENABLE_SSPI @@ -2027,11 +2033,6 @@ connectDBStart(PGconn *conn) */ resetPQExpBuffer(&conn->errorMessage); -#ifdef ENABLE_GSS - if (conn->gssencmode[0] == 'd') /* "disable" */ - conn->try_gss = false; -#endif - /* * Set up to try to connect to the first host. (Setting whichhost = -1 is * a bit of a cheat, but PQconnectPoll will advance it to 0 before @@ -2468,6 +2469,9 @@ keep_going: /* We will come back to here until there is conn->allow_ssl_try = (conn->sslmode[0] != 'd'); /* "disable" */ conn->wait_ssl_try = (conn->sslmode[0] == 'a'); /* "allow" */ #endif +#ifdef ENABLE_GSS + conn->try_gss = (conn->gssencmode[0] != 'd'); /* "disable" */ +#endif reset_connection_state_machine = false; need_new_connection = true; @@ -3349,12 +3353,8 @@ keep_going: /* We will come back to here until there is */ if (conn->gssenc && conn->gssencmode[0] == 'p') { - OM_uint32 minor; - /* postmaster expects us to drop the connection */ conn->try_gss = false; - conn->gssenc = false; - gss_delete_sec_context(&minor, &conn->gctx, NULL); pqDropConnection(conn, true); conn->status = CONNECTION_NEEDED; goto keep_going; @@ -3906,9 +3906,6 @@ makeEmptyPGconn(void) conn->verbosity = PQERRORS_DEFAULT; conn->show_context = PQSHOW_CONTEXT_ERRORS; conn->sock = PGINVALID_SOCKET; -#ifdef ENABLE_GSS - conn->try_gss = true; -#endif /* * We try to send at least 8K at a time, which is the usual size of pipe @@ -4065,22 +4062,6 @@ freePGconn(PGconn *conn) free(conn->gsslib); if (conn->connip) free(conn->connip); -#ifdef ENABLE_GSS - if (conn->gcred != GSS_C_NO_CREDENTIAL) - { - OM_uint32 minor; - - gss_release_cred(&minor, &conn->gcred); - conn->gcred = GSS_C_NO_CREDENTIAL; - } - if (conn->gctx) - { - OM_uint32 minor; - - gss_delete_sec_context(&minor, &conn->gctx, GSS_C_NO_BUFFER); - conn->gctx = NULL; - } -#endif /* Note that conn->Pfdebug is not ours to close or free */ if (conn->last_query) free(conn->last_query);