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Fix error handling of pg_b64_decode()

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Fix for commit 761c79508e7.  The previous error handling logic was not
quite correct.

Discussion: https://www.postgresql.org/message-id/flat/CAEudQAq-3yHsSdWoOOaw%2BgAQYgPMpMGuB5pt2yCXgv-YuxG2Hg%40mail.gmail.com
This commit is contained in:
Peter Eisentraut 2025-01-16 09:02:21 +01:00
parent ff030ebe25
commit d278541be4
1 changed files with 30 additions and 18 deletions
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48
src/interfaces/libpq/fe-connect.c
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@ -1805,18 +1805,24 @@ pqConnectOptions2(PGconn *conn)
int len;
len = pg_b64_dec_len(strlen(conn->scram_client_key));
/* Consider the zero-terminator */
if (len != SCRAM_MAX_KEY_LEN + 1)
{
libpq_append_conn_error(conn, "invalid SCRAM client key length: %d", len);
return false;
}
conn->scram_client_key_len = len;
conn->scram_client_key_binary = malloc(len);
if (!conn->scram_client_key_binary)
goto oom_error;
pg_b64_decode(conn->scram_client_key, strlen(conn->scram_client_key),
conn->scram_client_key_binary, len);
len = pg_b64_decode(conn->scram_client_key, strlen(conn->scram_client_key),
conn->scram_client_key_binary, len);
if (len < 0)
{
libpq_append_conn_error(conn, "invalid SCRAM client key");
free(conn->scram_client_key_binary);
return false;
}
if (len != SCRAM_MAX_KEY_LEN)
{
libpq_append_conn_error(conn, "invalid SCRAM client key length: %d", len);
free(conn->scram_client_key_binary);
return false;
}
conn->scram_client_key_len = len;
}
if (conn->scram_server_key)
@ -1824,18 +1830,24 @@ pqConnectOptions2(PGconn *conn)
int len;
len = pg_b64_dec_len(strlen(conn->scram_server_key));
/* Consider the zero-terminator */
if (len != SCRAM_MAX_KEY_LEN + 1)
{
libpq_append_conn_error(conn, "invalid SCRAM server key length: %d", len);
return false;
}
conn->scram_server_key_len = len;
conn->scram_server_key_binary = malloc(len);
if (!conn->scram_server_key_binary)
goto oom_error;
pg_b64_decode(conn->scram_server_key, strlen(conn->scram_server_key),
conn->scram_server_key_binary, len);
len = pg_b64_decode(conn->scram_server_key, strlen(conn->scram_server_key),
conn->scram_server_key_binary, len);
if (len < 0)
{
libpq_append_conn_error(conn, "invalid SCRAM server key");
free(conn->scram_server_key_binary);
return false;
}
if (len != SCRAM_MAX_KEY_LEN)
{
libpq_append_conn_error(conn, "invalid SCRAM server key length: %d", len);
free(conn->scram_server_key_binary);
return false;
}
conn->scram_server_key_len = len;
}
/*