Does the Cyrus SASL api not support the EXTERNAL mechanism? I'm trying
to use it as a client, but it returns SASL_NOMECH when asked.
% cat cyrus_sal_ex.c
/* cyrus_sasl_ex.c: Example of using the Cyrus SASL api */
#include <stdio.h> /* for printf() */
#include <sasl/sasl.h> /* for sasl_client_*(), SASL_*,
sasl_*_t */
static char const * SASL_return_code(int const code)
{
switch(code)
{
/* ... */
case SASL_OK: return "SASL_OK[0]:
successful result";
/* ... */
case SASL_NOMECH: return "SASL_NOMECH[-4]:
mechanism not supported";
/* ... */
}
return "unrecognized";
}
int main()
{
char const * output = NULL;
unsigned outlen = 0;
char const * mechanism = NULL;
sasl_conn_t * conn;
# define PRINT_RESULT( x ) do\
{\
int const __result = (x);\
printf("%s == %d\n\t%s\n", #x, __result,
SASL_return_code(__result));\
if (__result < 0) goto done;\
}\
while (0)
PRINT_RESULT( sasl_client_init( NULL ) );
PRINT_RESULT( sasl_client_new( "fake",
"fakey.mcfaker.ton",
"127.0.0.1", "127.255.255.1", NULL, 0, &conn) );
PRINT_RESULT( sasl_client_start( conn, "EXTERNAL",
NULL, &output,
&outlen, &mechanism) );
done:
# undef PRINT_RESULT
printf("output: [%d bytes] : %s\n", outlen, (output ?
output : "NULL") );
printf("mechanism: %s\n", (mechanism ? mechanism :
"NULL"));
return 0;
}
% gcc -I/sw/include -L/sw/lib -lsasl2 cyrus_sasl_ex.c -o
cyrus_sasl_ex # your header/library locations may vary
% ./cyrus_sasl_ex
sasl_client_init( NULL ) == 0
SASL_OK[0]: successful result
sasl_client_new( "fake", "fakey.mcfaker.ton", "127.0.0.1",
"127.255.255.1", NULL, 0, &conn) == 0
SASL_OK[0]: successful result
sasl_client_start( conn, "EXTERNAL", NULL, &output, &outlen,
&mechanism) == -4
SASL_NOMECH[-4]: mechanism not
supported
output: [0 bytes] : NULL
mechanism: EXTERNAL
%
I browsed through the source though, and it looks like all the clients
should support the EXTERNAL mechanism:
cyrus-sasl-2.1.22/lib/client.c:
196 int sasl_client_init(const sasl_callback_t *callbacks)
197 {
...
227
228 sasl_client_add_plugin("EXTERNAL",
&external_client_plug_init);
229
So I'm guessing I'm doing something wrong here. I tried adding all the
sasl_callback_ts I could think of to sasl_client_*(), but it didnt'
seem to make a difference. Is there some argument I should pass that
asserts that EXTERNAL is an acceptable mechanism? Or is SASL_NOMECH
always returned for EXTERNAL - b/c that doesn't seem right.
Can anyone help me out?
