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Explicitly require password for SCRAM exchange

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This refactors the SASL init flow to set password_needed on the two
SCRAM exchanges currently supported. The code already required this
but was set up in such a way that all SASL exchanges required using
a password, a restriction which may not hold for all exchanges (the
example at hand being the proposed OAuthbearer exchange).

This was extracted from a larger patchset to introduce OAuthBearer
authentication and authorization.

Author: Jacob Champion <jacob.champion@enterprisedb.com>
Discussion: https://postgr.es/m/d1b467a78e0e36ed85a09adf979d04cf124a9d4b.camel@vmware.com
This commit is contained in:
Daniel Gustafsson 2024-03-21 14:45:54 +01:00
parent 24178e235e
commit adcdb2c8dd
1 changed files with 15 additions and 13 deletions
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28
src/interfaces/libpq/fe-auth.c
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@ -425,7 +425,7 @@ pg_SASL_init(PGconn *conn, int payloadlen)
int initialresponselen;
const char *selected_mechanism;
PQExpBufferData mechanism_buf;
char *password;
char *password = NULL;
SASLStatus status;
initPQExpBuffer(&mechanism_buf);
@ -446,8 +446,7 @@ pg_SASL_init(PGconn *conn, int payloadlen)
/*
* Parse the list of SASL authentication mechanisms in the
* AuthenticationSASL message, and select the best mechanism that we
* support. SCRAM-SHA-256-PLUS and SCRAM-SHA-256 are the only ones
* supported at the moment, listed by order of decreasing importance.
* support. Mechanisms are listed by order of decreasing importance.
*/
selected_mechanism = NULL;
for (;;)
@ -487,6 +486,7 @@ pg_SASL_init(PGconn *conn, int payloadlen)
{
selected_mechanism = SCRAM_SHA_256_PLUS_NAME;
conn->sasl = &pg_scram_mech;
conn->password_needed = true;
}
#else
/*
@ -522,6 +522,7 @@ pg_SASL_init(PGconn *conn, int payloadlen)
{
selected_mechanism = SCRAM_SHA_256_NAME;
conn->sasl = &pg_scram_mech;
conn->password_needed = true;
}
}
@ -545,18 +546,19 @@ pg_SASL_init(PGconn *conn, int payloadlen)
/*
* First, select the password to use for the exchange, complaining if
* there isn't one. Currently, all supported SASL mechanisms require a
* password, so we can just go ahead here without further distinction.
* there isn't one and the selected SASL mechanism needs it.
*/
conn->password_needed = true;
password = conn->connhost[conn->whichhost].password;
if (password == NULL)
password = conn->pgpass;
if (password == NULL || password[0] == '\0')
if (conn->password_needed)
{
appendPQExpBufferStr(&conn->errorMessage,
PQnoPasswordSupplied);
goto error;
password = conn->connhost[conn->whichhost].password;
if (password == NULL)
password = conn->pgpass;
if (password == NULL || password[0] == '\0')
{
appendPQExpBufferStr(&conn->errorMessage,
PQnoPasswordSupplied);
goto error;
}
}
Assert(conn->sasl);