/*
- * $Id: uams_gss.c,v 1.2.2.4.2.1 2004-12-07 18:41:10 bfernhomberg Exp $
+ * $Id: uams_gss.c,v 1.2.2.4.2.2 2009-09-16 09:40:40 franklahm Exp $
*
* Copyright (c) 1990,1993 Regents of The University of Michigan.
- * Copyright (c) 1999 Adrian Sun (asun@u.washington.edu)
+ * Copyright (c) 1999 Adrian Sun (asun@u.washington.edu)
* Copyright (c) 2003 The Reed Institute
* Copyright (c) 2004 Bjoern Fernhomberg
* All Rights Reserved. See COPYRIGHT.
#define MIN(a, b) ((a > b) ? b : a)
-static void log_status( char *s, OM_uint32 major_status,
- OM_uint32 minor_status )
+static void log_status( char *s, OM_uint32 major_status,
+ OM_uint32 minor_status )
{
gss_buffer_desc msg = GSS_C_EMPTY_BUFFER;
OM_uint32 min_status, maj_status;
OM_uint32 maj_ctx = 0, min_ctx = 0;
while (1) {
- maj_status = gss_display_status( &min_status, major_status,
- GSS_C_GSS_CODE, GSS_C_NULL_OID,
- &maj_ctx, &msg );
+ maj_status = gss_display_status( &min_status, major_status,
+ GSS_C_GSS_CODE, GSS_C_NULL_OID,
+ &maj_ctx, &msg );
LOG(log_info, logtype_uams, "uams_gss.c :do_gss_auth: %s %.*s (error %s)", s,
- (int)msg.length, msg.value, strerror(errno));
- gss_release_buffer(&min_status, &msg);
+ (int)msg.length, msg.value, strerror(errno));
+ gss_release_buffer(&min_status, &msg);
- if (!maj_ctx)
- break;
+ if (!maj_ctx)
+ break;
}
while (1) {
- maj_status = gss_display_status( &min_status, minor_status,
- GSS_C_MECH_CODE, GSS_C_NULL_OID, // gss_mech_krb5,
- &min_ctx, &msg );
- LOG(log_info, logtype_uams, "uams_gss.c :do_gss_auth: %s %.*s (error %s)", s,
- (int)msg.length, msg.value, strerror(errno));
- gss_release_buffer(&min_status, &msg);
-
- if (!min_ctx)
- break;
+ maj_status = gss_display_status( &min_status, minor_status,
+ GSS_C_MECH_CODE, GSS_C_NULL_OID, // gss_mech_krb5,
+ &min_ctx, &msg );
+ LOG(log_info, logtype_uams, "uams_gss.c :do_gss_auth: %s %.*s (error %s)", s,
+ (int)msg.length, msg.value, strerror(errno));
+ gss_release_buffer(&min_status, &msg);
+
+ if (!min_ctx)
+ break;
}
}
gss_buffer_desc s_princ_buffer;
/* get all the required information from afpd */
- if (uam_afpserver_option(obj, UAM_OPTION_KRB5REALM, (void*) &realm, &realmlen) < 0)
- return 1;
- if (uam_afpserver_option(obj, UAM_OPTION_FQDN, (void*) &fqdn, &fqdnlen) < 0)
- return 1;
+ if (uam_afpserver_option(obj, UAM_OPTION_KRB5REALM, (void*) &realm, &realmlen) < 0)
+ return 1;
+ if (uam_afpserver_option(obj, UAM_OPTION_FQDN, (void*) &fqdn, &fqdnlen) < 0)
+ return 1;
if (uam_afpserver_option(obj, UAM_OPTION_KRB5SERVICE, (void *)&service, &servicelen) < 0)
return 1;
/* we need all the info, log error and return if one's missing */
if (!service || !servicelen || !fqdn || !fqdnlen || !realm || !realmlen) {
- LOG(log_error, logtype_uams,
+ LOG(log_error, logtype_uams,
"get_afpd_principal: could not retrieve required information from afpd.");
return 1;
}
principal_length = servicelen + 1 + fqdnlen + 1 + realmlen + 1;
if ( NULL == (principal = (char*) malloc( principal_length)) ) {
LOG(log_error, logtype_uams,
- "get_afpd_principal: out of memory allocating %u bytes",
+ "get_afpd_principal: out of memory allocating %u bytes",
principal_length);
return 1;
}
strlcpy( principal, service, principal_length);
strlcat( principal, "/", principal_length);
- /*
+ /*
* The fqdn we get from afpd may contain a port.
* We need to strip the port from fqdn for principal.
*/
p = strchr(fqdn, ':');
if (p)
- *p = '\0';
+ *p = '\0';
strlcat( principal, fqdn, principal_length);
if (p)
- *p = ':';
+ *p = ':';
strlcat( principal, "@", principal_length);
strlcat( principal, realm, principal_length);
LOG(log_debug, logtype_uams, "get_afpd_principal: importing principal `%s'", principal);
major_status = gss_import_name( &minor_status,
- &s_princ_buffer,
- GSS_C_NO_OID,
- server_name );
+ &s_princ_buffer,
+ GSS_C_NO_OID,
+ server_name );
- /*
+ /*
* Get rid of malloc'ed memmory.
* Don't release the s_princ_buffer, we free principal instead.
*/
char *p;
int namelen, ret=0;
- /*
+ /*
* To extract the unix username, use gss_display_name on client_name.
* We do rely on gss_display_name returning a zero terminated string.
* The username returned contains the realm and possibly an instance.
int ret=0;
gss_buffer_desc sesskey_buff, wrap_buff;
- /*
+ /*
* gss_wrap afpd's session_key.
* This is needed fo OS X 10.3 clients. They request this information
* with type 8 (kGetKerberosSessionKey) on FPGetSession.
sesskey_buff.value = sinfo->sessionkey;
sesskey_buff.length = sinfo->sessionkey_len;
- /* gss_wrap the session key with the default mechanism.
+ /* gss_wrap the session key with the default mechanism.
Require both confidentiality and integrity services */
gss_wrap (&status, context, 1, GSS_C_QOP_DEFAULT, &sesskey_buff, NULL, &wrap_buff);
if ( status != GSS_S_COMPLETE) {
LOG(log_error, logtype_uams, "wrap_sessionkey: failed to gss_wrap sessionkey");
- log_status( "GSS wrap", 0, status );
+ log_status( "GSS wrap", 0, status );
return 1;
}
/* store the wrapped session key in afpd's session_info struct */
if ( NULL == (sinfo->cryptedkey = malloc ( wrap_buff.length )) ) {
- LOG(log_error, logtype_uams,
- "wrap_sessionkey: out of memory tyring to allocate %u bytes",
+ LOG(log_error, logtype_uams,
+ "wrap_sessionkey: out of memory tyring to allocate %u bytes",
wrap_buff.length);
ret = 1;
} else {
LOG(log_debug, logtype_uams,
"acquire credentials: acquiring credentials (uid = %d, keytab = %s)",
(int)geteuid(), getenv( "KRB5_KTNAME") );
- /*
- * Acquire credentials usable for accepting context negotiations.
- * Credentials are for server_name, have an indefinite lifetime,
- * have no specific mechanisms, are to be used for accepting context
- * negotiations and are to be placed in server_creds.
- * We don't care about the mechanisms or about the time for which they are valid.
- */
+ /*
+ * Acquire credentials usable for accepting context negotiations.
+ * Credentials are for server_name, have an indefinite lifetime,
+ * have no specific mechanisms, are to be used for accepting context
+ * negotiations and are to be placed in server_creds.
+ * We don't care about the mechanisms or about the time for which they are valid.
+ */
major_status = gss_acquire_cred( &minor_status, *server_name,
- GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_ACCEPT,
- server_creds, NULL, NULL );
+ GSS_C_INDEFINITE, GSS_C_NO_OID_SET, GSS_C_ACCEPT,
+ server_creds, NULL, NULL );
if (major_status != GSS_S_COMPLETE) {
log_status( "acquire_cred", major_status, minor_status );
return 1;
}
-
+
return 0;
}
/*-------------*/
-static int accept_sec_context (gss_ctx_id_t *context, gss_cred_id_t server_creds,
- gss_buffer_desc *ticket_buffer, gss_name_t *client_name,
- gss_buffer_desc *authenticator_buff)
+static int accept_sec_context (gss_ctx_id_t *context, gss_cred_id_t server_creds,
+ gss_buffer_desc *ticket_buffer, gss_name_t *client_name,
+ gss_buffer_desc *authenticator_buff)
{
OM_uint32 major_status = 0, minor_status = 0, ret_flags;
authenticator_buff->length = 0;
authenticator_buff->value = NULL;
- LOG(log_debug, logtype_uams, "accept_context: accepting context (ticketlen: %u)",
+ LOG(log_debug, logtype_uams, "accept_context: accepting context (ticketlen: %u)",
ticket_buffer->length);
- /*
+ /*
* Try to accept the secondary context using the tocken in ticket_buffer.
- * We don't care about the mechanisms used, nor for the time.
+ * We don't care about the mechanisms used, nor for the time.
* We don't act as a proxy either.
*/
major_status = gss_accept_sec_context( &minor_status, context,
- server_creds, ticket_buffer, GSS_C_NO_CHANNEL_BINDINGS,
- client_name, NULL, authenticator_buff,
- &ret_flags, NULL, NULL );
+ server_creds, ticket_buffer, GSS_C_NO_CHANNEL_BINDINGS,
+ client_name, NULL, authenticator_buff,
+ &ret_flags, NULL, NULL );
if (major_status != GSS_S_COMPLETE) {
log_status( "accept_sec_context", major_status, minor_status );
log_ctx_flags( ret_flags );
return 0;
}
-
+
/* return 0 on success */
static int do_gss_auth(void *obj, char *ibuf, int ticket_len,
- char *rbuf, int *rbuflen, char *username, int ulen,
- struct session_info *sinfo )
+ char *rbuf, int *rbuflen, char *username, int ulen,
+ struct session_info *sinfo )
{
OM_uint32 status = 0;
gss_name_t server_name, client_name;
return 1;
}
log_principal(server_name);
-
+
/* Now we have to acquire our credentials */
if ((ret = acquire_credentials (&server_name, &server_creds)))
- goto cleanup_vars;
+ goto cleanup_vars;
- /*
- * Try to accept the secondary context, using the ticket/token the
- * client sent us. Ticket is stored at current ibuf position.
- * Don't try to release ticket_buffer later, it points into ibuf!
+ /*
+ * Try to accept the secondary context, using the ticket/token the
+ * client sent us. Ticket is stored at current ibuf position.
+ * Don't try to release ticket_buffer later, it points into ibuf!
*/
ticket_buffer.length = ticket_len;
ticket_buffer.value = ibuf;
- ret = accept_sec_context (&context_handle, server_creds, &ticket_buffer,
- &client_name, &authenticator_buff);
+ ret = accept_sec_context (&context_handle, server_creds, &ticket_buffer,
+ &client_name, &authenticator_buff);
if (!ret) {
- /* We succesfully acquired the secondary context, now get the
+ /* We succesfully acquired the secondary context, now get the
username for afpd and gss_wrap the sessionkey */
if ( 0 == (ret = get_client_username(username, ulen, &client_name)) ) {
ret = wrap_sessionkey(context_handle, sinfo);
}
if (!ret) {
- /* FIXME: Is copying the authenticator really necessary?
+ /* FIXME: Is copying the authenticator really necessary?
Where is this documented? */
u_int16_t auth_len = htons( authenticator_buff.length );
*rbuflen += authenticator_buff.length;
}
- /* Clean up after ourselves */
+ /* Clean up after ourselves */
gss_release_name( &status, &client_name );
- if ( authenticator_buff.value)
- gss_release_buffer( &status, &authenticator_buff );
+ if ( authenticator_buff.value)
+ gss_release_buffer( &status, &authenticator_buff );
gss_delete_sec_context( &status, &context_handle, NULL );
- }
+ }
gss_release_cred( &status, &server_creds );
cleanup_vars:
gss_release_name( &status, &server_name );
-
+
return ret;
}
/* -------------------------- */
static int gss_login(void *obj, struct passwd **uam_pwd,
- char *ibuf, int ibuflen,
- char *rbuf, int *rbuflen)
+ char *ibuf, int ibuflen,
+ char *rbuf, int *rbuflen)
{
u_int16_t temp16;
*rbuflen = 0;
- /* The reply contains a two-byte ID value - note
+ /* The reply contains a two-byte ID value - note
* that Apple's implementation seems to always return 1 as well
*/
temp16 = htons( 1 );
}
static int gss_logincont(void *obj, struct passwd **uam_pwd,
- char *ibuf, int ibuflen,
- char *rbuf, int *rbuflen)
+ char *ibuf, int ibuflen,
+ char *rbuf, int *rbuflen)
{
struct passwd *pwd = NULL;
u_int16_t login_id;
* pad (byte) [consumed before login_ext is called]
* ?? (byte) - always observed to be 0
* id returned in LoginExt response (u_int16_t)
- * username, encoding unspecified, null terminated C string,
+ * username, encoding unspecified, null terminated C string,
* padded when the terminating null is an even numbered byte.
- * The packet is formated such that the username begins on an
+ * The packet is formated such that the username begins on an
* odd numbered byte. Eg if the username is 3 characters and the
* terminating null makes 4, expect to pad the the result.
* The encoding of this string is unknown.
if (ibuflen < 3) {
LOG(log_info, logtype_uams, "uams_gss.c :LoginCont: received incomplete packet");
- return AFPERR_PARAM;
+ return AFPERR_PARAM;
}
ibuf++, ibuflen--; /* ?? */
/* get the session_info structure from afpd. We need the session key */
if (uam_afpserver_option(obj, UAM_OPTION_SESSIONINFO, (void *)&sinfo, NULL) < 0)
- return AFPERR_MISC;
+ return AFPERR_MISC;
if (sinfo->sessionkey == NULL || sinfo->sessionkey_len == 0) {
/* Should never happen. Most likely way too old afpd version */
while( *ibuf && ibuflen ) { ibuf++, ibuflen--; }
if (ibuflen < 4) {
LOG(log_info, logtype_uams, "uams_gss.c :LoginCont: user is %s, no ticket", p);
- return AFPERR_PARAM;
+ return AFPERR_PARAM;
}
ibuf++, ibuflen--; /* null termination */
if (ticket_len > ibuflen) {
LOG(log_info, logtype_uams,
"uams_gss.c :LoginCont: invalid ticket length (%u > %u)", ticket_len, ibuflen);
- return AFPERR_PARAM;
+ return AFPERR_PARAM;
}
/* now try to authenticate */
Should we compare this to the username the client sent in the clear?
We know the character encoding of the cleartext username (UTF8), what
encoding is the gssapi name in? */
- if((pwd = uam_getname( obj, username, userlen )) == NULL) {
- LOG(log_info, logtype_uams, "uam_getname() failed for %s", username);
- return AFPERR_PARAM;
- }
- if (uam_checkuser(pwd) < 0) {
- LOG(log_info, logtype_uams, "%s not a valid user", username);
- return AFPERR_NOTAUTH;
- }
- *rbuflen = rblen;
- *uam_pwd = pwd;
- return AFP_OK;
+ if((pwd = uam_getname( obj, username, userlen )) == NULL) {
+ LOG(log_info, logtype_uams, "uam_getname() failed for %s", username);
+ return AFPERR_PARAM;
+ }
+ if (uam_checkuser(pwd) < 0) {
+ LOG(log_info, logtype_uams, "%s not a valid user", username);
+ return AFPERR_NOTAUTH;
+ }
+ *rbuflen = rblen;
+ *uam_pwd = pwd;
+ return AFP_OK;
} else {
- LOG(log_info, logtype_uams, "do_gss_auth failed" );
- *rbuflen = 0;
+ LOG(log_info, logtype_uams, "do_gss_auth failed" );
+ *rbuflen = 0;
return AFPERR_MISC;
}
}
* point is trustworthy as we'll have a signed ticket to parse in logincont.
*/
static int gss_login_ext(void *obj, char *uname, struct passwd **uam_pwd,
- char *ibuf, int ibuflen,
- char *rbuf, int *rbuflen)
+ char *ibuf, int ibuflen,
+ char *rbuf, int *rbuflen)
{
u_int16_t temp16;
*rbuflen = 0;
- /* The reply contains a two-byte ID value - note
+ /* The reply contains a two-byte ID value - note
* that Apple's implementation seems to always return 1 as well
*/
temp16 = htons( 1 );
int uam_setup(const char *path)
{
- if (uam_register(UAM_SERVER_LOGIN_EXT, path, "Client Krb v2",
- gss_login, gss_logincont, gss_logout, gss_login_ext) < 0)
- if (uam_register(UAM_SERVER_LOGIN, path, "Client Krb v2",
- gss_login, gss_logincont, gss_logout) < 0)
- return -1;
+ if (uam_register(UAM_SERVER_LOGIN_EXT, path, "Client Krb v2",
+ gss_login, gss_logincont, gss_logout, gss_login_ext) < 0)
+ if (uam_register(UAM_SERVER_LOGIN, path, "Client Krb v2",
+ gss_login, gss_logincont, gss_logout) < 0)
+ return -1;
- return 0;
+ return 0;
}
static void uam_cleanup(void)
{
- uam_unregister(UAM_SERVER_LOGIN_EXT, "Client Krb v2");
+ uam_unregister(UAM_SERVER_LOGIN_EXT, "Client Krb v2");
}
UAM_MODULE_EXPORT struct uam_export uams_gss = {
- UAM_MODULE_SERVER,
- UAM_MODULE_VERSION,
- uam_setup, uam_cleanup
+ UAM_MODULE_SERVER,
+ UAM_MODULE_VERSION,
+ uam_setup, uam_cleanup
};
#endif
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