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/* MD5 Digest Authentication.
cribbed from LWP::Authen::Digest, the RFC, and auth.c in the jabber
code. Moving out of the static RVP module so that others can use it
if necessary.
*/
/*
* Reverse-engineering reveals that the Microsoft client:
* - supports MD5 and MD5-sess
* - supports opaque
* - may support stale, it at least doesn't abandon auth when it sees it
* - only supports qop=auth (no auth-int, and definitely no missing qop)
*
* Anything it doesn't like causes it to revert to not authing at all.
*/
#include <glib.h>
#include <string.h>
/* Gaim includes */
#include <debug.h>
/* local include */
#include "digest_access_auth.h"
#ifndef NOMD5
/* shims for gcrypt */
#ifdef GCRYPT_MD5
typedef guint8 md5_byte_t;
#define md5_state_t gcry_md_hd_t
#define md5_init( handle ) gcry_md_open( handle, GCRY_MD_MD5, 0 )
static void md5_append( md5_state_t *handle, md5_byte_t *buffer, size_t length ) {
gcry_md_write( *handle, buffer, length );
}
static void md5_finish( md5_state_t *handle, md5_byte_t *buffer ) {
unsigned char *buf = gcry_md_read( *handle, 0 );
bcopy( buf, buffer, 16 ); /* MD5 length == 16 */
gcry_md_close( *handle );
}
#endif
gchar *get_auth_digest( GaimConnection *gc, gchar *method, gchar *uri,
gchar *header, gchar *user, gchar *pass ) {
gchar **auth_param = NULL;
gint i = 0;
gchar *cnonce, *a1 = NULL, *a2, *retval = NULL, hexresp[33];
md5_state_t md5;
md5_byte_t ha2[16], response[16];
GHashTable *params = g_hash_table_new( g_str_hash, g_str_equal );
/* slightly naive, but seems to be acceptable for now. FIXME */
auth_param = g_strsplit( &header[strlen( "Digest ")], ",", 0 );
/* default algorithm */
g_hash_table_replace( params, g_strdup( "algorithm" ), g_strdup( "MD5" ));
/* find the nonce, etc. */
for ( i = 0; auth_param[i]; i++ ) {
gchar **bits;
/* no leading/trailing spaces, thanks. */
g_strstrip( auth_param[i] );
bits = g_strsplit( auth_param[i], "=", 2 );
/* clean up value by unquoting it FIXME */
if ( bits[1][0] == '"' ) {
memcpy( &bits[1][0], &bits[1][1],
strlen( bits[1] ) - 1 );
bits[1][strlen( bits[1] ) - 1] = '\0';
}
if ( bits[1][strlen( bits[1] ) - 1] == '"' ) {
bits[1][strlen( bits[1] ) - 1 ] = '\0';
}
g_hash_table_replace( params, g_strdup( bits[0] ), g_strdup( bits[1] ));
gaim_debug_misc( __FUNCTION__, "Found %s = %s\n", bits[0], bits[1] );
g_strfreev( bits );
}
if ( g_hash_table_lookup( params, "nonce" ) == NULL ||
g_hash_table_lookup( params, "realm" ) == NULL ) {
gaim_connection_error( gc,
"Can't find one of nonce or realm in header" );
return NULL;
}
cnonce = g_strdup_printf( "%x%u%x", g_random_int(), (int)time( NULL ),
g_random_int() );
if ( !strcasecmp( g_hash_table_lookup( params, "algorithm" ), "MD5" )) {
/* A1 = "username : realm : passwd"; */
md5_init( &md5 );
md5_append( &md5, (md5_byte_t *)user, strlen( user ));
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)g_hash_table_lookup( params, "realm" ),
strlen( g_hash_table_lookup( params, "realm" )));
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)pass, strlen( pass ));
a1 = g_malloc0( 16 + 1 );
md5_finish( &md5, (md5_byte_t *)a1 );
a1[16] = '\0';
} else if ( !strcasecmp( g_hash_table_lookup( params, "algorithm" ),
"MD5-sess" )) {
/* A1 = "H( username : realm : passwd ):nonce:cnonce"; */
md5_byte_t a1_b[16];
md5_init( &md5 );
md5_append( &md5, (md5_byte_t *)user, strlen( user ));
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)g_hash_table_lookup( params, "realm" ),
strlen( g_hash_table_lookup( params, "realm" )));
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)pass, strlen( pass ));
md5_finish( &md5, a1_b );
/* hexify */
a1 = g_malloc0( 32 + strlen( g_hash_table_lookup( params, "nonce" )) +
strlen( cnonce ) + 1 );
for ( i = 0; i < 16; i++ ) {
sprintf( &a1[i * 2], "%02x", (guint8)a1_b[i] );
}
/* append nonce & cnonce */
memcpy( &a1[32], g_hash_table_lookup( params, "nonce" ),
strlen( g_hash_table_lookup( params, "nonce" )));
memcpy( &a1[32 + strlen( g_hash_table_lookup( params, "nonce" ) )], cnonce,
strlen( cnonce ));
a1[32 + strlen( g_hash_table_lookup( params, "nonce" ) ) + strlen( cnonce )] = '\0';
} else {
gchar *msg = g_strdup_printf( "Server asked for unknown algorithm '%s'",
(char *)g_hash_table_lookup( params,
"algorithm" ));
gaim_connection_error( gc, msg );
g_free( msg );
return NULL;
}
if ( g_hash_table_lookup( params, "qop" ) != NULL &&
( !strcmp( g_hash_table_lookup( params, "qop" ), "auth" ) ||
!strcmp( g_hash_table_lookup( params, "qop" ), "auth-int" ))) {
if ( !strcmp( g_hash_table_lookup( params, "qop" ), "auth" )) {
/* A2 = method : uri */
a2 = g_strdup_printf( "%s:%s%s", method, uri[0] == '/' ? "" : "/", uri );
} else {
/* we don't support auth-int just now */
/* A2 = method : uri : content */
a2 = g_strdup_printf( "%s:%s%s:%s", method, uri[0] == '/' ? "" : "/",
uri, "HEXME(XXX)" );
}
} else {
/* A2 = method : uri */
a2 = g_strdup_printf( "%s:%s%s", method, uri[0] == '/' ? "" : "/", uri );
}
/* MD5-ify a2 */
md5_init( &md5 );
md5_append( &md5, (md5_byte_t *)a2, strlen( a2 ));
md5_finish( &md5, ha2 );
/* now gob it all together appropriate to the qop parameter */
if ( g_hash_table_lookup( params, "qop" ) != NULL &&
( !strcmp( g_hash_table_lookup( params, "qop" ), "auth" ) ||
!strcmp( g_hash_table_lookup( params, "qop" ), "auth-int" ))) {
/* request-digest = KD(H(A1), nonce : nc : cnonce : qop : H(A2) */
md5_init( &md5 );
/* H(A1) */
for ( i = 0; i < strlen( a1 ); i++ ) {
gchar *hex = g_strdup_printf( "%02x", (guint8)a1[i] );
md5_append( &md5, (md5_byte_t *)hex, 2 );
g_free( hex );
}
/* :nonce */
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)g_hash_table_lookup( params, "nonce" ), strlen( g_hash_table_lookup( params, "nonce" ) ));
/* :nc */
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)"00000001", strlen( "00000001" ));
/* :cnonce */
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)cnonce, strlen( cnonce ));
/* :qop */
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)g_hash_table_lookup( params, "qop" ), strlen( g_hash_table_lookup( params, "qop" ) ));
/* : */
md5_append( &md5, (md5_byte_t *)":", 1 );
/* H(A2) */
for ( i = 0; i < 16; i++ ) {
gchar *hex = g_strdup_printf( "%02x", (guint8)ha2[i] );
md5_append( &md5, (md5_byte_t *)hex, 2 );
g_free( hex );
}
md5_finish( &md5, response );
/* turn response into hex */
for ( i = 0; i < 16; i++ ) {
sprintf( &hexresp[i * 2], "%02x", (guint8)response[i] );
}
hexresp[32] = '\0';
retval = g_strdup_printf( "Digest "
"username=\"%s\", "
"realm=\"%s\", "
"qop=\"%s\", "
"algorithm=\"%s\", "
"uri=\"%s%s\", "
"nonce=\"%s\", "
"nc=00000001, "
"cnonce=\"%s\", "
"response=\"%s\"",
user,
(char *)g_hash_table_lookup( params, "realm" ),
(char *)g_hash_table_lookup( params, "qop" ),
(char *)g_hash_table_lookup( params, "algorithm" ),
uri[0] == '/' ? "" : "/", uri,
(char *)g_hash_table_lookup( params, "nonce" ),
cnonce,
hexresp );
} else {
/* request-digest = KD(H(A1), nonce : H(A2) */
md5_init( &md5 );
/* H(A1) */
for ( i = 0; i < 16; i++ ) {
gchar *hex = g_strdup_printf( "%02x", (guint8)a1[i] );
md5_append( &md5, (md5_byte_t *)hex, 2 );
g_free( hex );
}
/* :nonce: */
md5_append( &md5, (md5_byte_t *)":", 1 );
md5_append( &md5, (md5_byte_t *)g_hash_table_lookup( params, "nonce" ), strlen( g_hash_table_lookup( params, "nonce" ) ));
md5_append( &md5, (md5_byte_t *)":", 1 );
/* H(A2) */
for ( i = 0; i < 16; i++ ) {
gchar *hex = g_strdup_printf( "%02x", (guint8)ha2[i] );
md5_append( &md5, (md5_byte_t *)hex, 2 );
g_free( hex );
}
md5_finish( &md5, response );
/* turn response into hex */
for ( i = 0; i < 16; i++ ) {
sprintf( &hexresp[i * 2], "%02x", (guint8)response[i] );
}
hexresp[32] = '\0';
retval = g_strdup_printf( "Digest "
"username=\"%s\", "
"realm=\"%s\", "
"uri=\"%s%s\", "
"nonce=\"%s\", "
"response=\"%s\"",
user,
(char *)g_hash_table_lookup( params, "realm" ),
uri[0] == '/' ? "" : "/", uri,
(char *)g_hash_table_lookup( params, "nonce" ),
hexresp );
}
if ( auth_param != NULL ) {
g_strfreev( auth_param );
}
if ( a1 != NULL ) { g_free( a1 ); }
return retval;
}
#endif
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