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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 resettinga 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 correctplace, else switching to a different server won't work right.Remove now-redundant cleanup of GSS resources around one (and, forsome reason, only one) pqDropConnection call in connectDBStart.Per report from Kyotaro Horiguchi that psql would freeze up,rather than successfully resetting a GSS-encrypted connectionafter a server restart.This is YA oversight in commitb0b39f7, so back-patch to v12.Discussion:https://postgr.es/m/20200710.173803.435804731896516388.horikyota.ntt@gmail.com

1 parent5fea14f commite8b22a8Copy full SHA for e8b22a8

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src/interfaces/libpq
- fe-connect.c

1 file changed

-28

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`‎src/interfaces/libpq/fe-connect.c‎`

Lines changed: 9 additions & 28 deletions

Original file line number	Diff line number	Diff line change
`@@ -455,6 +455,11 @@ pqDropConnection(PGconn *conn, bool flushInput)`
`455`	`455`	`{`
`456`	`456`	`OM_uint32min_s;`
`457`	`457`
	`458`	`+if (conn->gcred!=GSS_C_NO_CREDENTIAL)`
	`459`	`+{`
	`460`	`+gss_release_cred(&min_s,&conn->gcred);`
	`461`	`+conn->gcred=GSS_C_NO_CREDENTIAL;`
	`462`	`+}`
`458`	`463`	`if (conn->gctx)`
`459`	`464`	`gss_delete_sec_context(&min_s,&conn->gctx,GSS_C_NO_BUFFER);`
`460`	`465`	`if (conn->gtarg_nam)`
`@@ -474,6 +479,7 @@ pqDropConnection(PGconn *conn, bool flushInput)`
`474`	`479`	`free(conn->gss_ResultBuffer);`
`475`	`480`	`conn->gss_ResultBuffer=NULL;`
`476`	`481`	`}`
	`482`	`+conn->gssenc= false;`
`477`	`483`	`}`
`478`	`484`	`#endif`
`479`	`485`	`#ifdefENABLE_SSPI`
`@@ -1936,11 +1942,6 @@ connectDBStart(PGconn *conn)`
`1936`	`1942`	`*/`
`1937`	`1943`	`resetPQExpBuffer(&conn->errorMessage);`
`1938`	`1944`
`1939`		`-#ifdefENABLE_GSS`
`1940`		`-if (conn->gssencmode[0]=='d')/* "disable" */`
`1941`		`-conn->try_gss= false;`
`1942`		`-#endif`
`1943`		`-`
`1944`	`1945`	`/*`
`1945`	`1946`	`* Set up to try to connect to the first host. (Setting whichhost = -1 is`
`1946`	`1947`	`* a bit of a cheat, but PQconnectPoll will advance it to 0 before`
`@@ -2380,6 +2381,9 @@ PQconnectPoll(PGconn *conn)`
`2380`	`2381`	`conn->allow_ssl_try= (conn->sslmode[0]!='d');/* "disable" */`
`2381`	`2382`	`conn->wait_ssl_try= (conn->sslmode[0]=='a');/* "allow" */`
`2382`	`2383`	`#endif`
	`2384`	`+#ifdefENABLE_GSS`
	`2385`	`+conn->try_gss= (conn->gssencmode[0]!='d');/* "disable" */`
	`2386`	`+#endif`
`2383`	`2387`
`2384`	`2388`	`reset_connection_state_machine= false;`
`2385`	`2389`	`need_new_connection= true;`
`@@ -3259,12 +3263,8 @@ PQconnectPoll(PGconn *conn)`
`3259`	`3263`	`*/`
`3260`	`3264`	`if (conn->gssenc&&conn->gssencmode[0]=='p')`
`3261`	`3265`	`{`
`3262`		`-OM_uint32minor;`
`3263`		`-`
`3264`	`3266`	`/* postmaster expects us to drop the connection */`
`3265`	`3267`	`conn->try_gss= false;`
`3266`		`-conn->gssenc= false;`
`3267`		`-gss_delete_sec_context(&minor,&conn->gctx,NULL);`
`3268`	`3268`	`pqDropConnection(conn, true);`
`3269`	`3269`	`conn->status=CONNECTION_NEEDED;`
`3270`	`3270`	`gotokeep_going;`
`@@ -3838,9 +3838,6 @@ makeEmptyPGconn(void)`
`3838`	`3838`	`conn->verbosity=PQERRORS_DEFAULT;`
`3839`	`3839`	`conn->show_context=PQSHOW_CONTEXT_ERRORS;`
`3840`	`3840`	`conn->sock=PGINVALID_SOCKET;`
`3841`		`-#ifdefENABLE_GSS`
`3842`		`-conn->try_gss= true;`
`3843`		`-#endif`
`3844`	`3841`
`3845`	`3842`	`/*`
`3846`	`3843`	`* We try to send at least 8K at a time, which is the usual size of pipe`
`@@ -3980,22 +3977,6 @@ freePGconn(PGconn *conn)`
`3980`	`3977`	`free(conn->gsslib);`
`3981`	`3978`	`if (conn->connip)`
`3982`	`3979`	`free(conn->connip);`
`3983`		`-#ifdefENABLE_GSS`
`3984`		`-if (conn->gcred!=GSS_C_NO_CREDENTIAL)`
`3985`		`-{`
`3986`		`-OM_uint32minor;`
`3987`		`-`
`3988`		`-gss_release_cred(&minor,&conn->gcred);`
`3989`		`-conn->gcred=GSS_C_NO_CREDENTIAL;`
`3990`		`-}`
`3991`		`-if (conn->gctx)`
`3992`		`-{`
`3993`		`-OM_uint32minor;`
`3994`		`-`
`3995`		`-gss_delete_sec_context(&minor,&conn->gctx,GSS_C_NO_BUFFER);`
`3996`		`-conn->gctx=NULL;`
`3997`		`-}`
`3998`		`-#endif`
`3999`	`3980`	`/* Note that conn->Pfdebug is not ours to close or free */`
`4000`	`3981`	`if (conn->last_query)`
`4001`	`3982`	`free(conn->last_query);`

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`‎src/interfaces/libpq/fe-connect.c‎`

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