r1198: Merge the Samba 3.0 ntlm_auth, including the kerberos and SPENGO parts.

I have moved the SPNEGO and Kerberos code into libcli/auth, and intend
to refactor them into the same format as NTLMSSP.

Andrew Bartlett
(This used to be commit 58da78a7460d5d0a4abee7d7b84799c228e6bc0b)

1 files changed, 175 insertions, 0 deletions

diff --git a/source4/libcli/auth/kerberos.c b/source4/libcli/auth/kerberos.c
new file mode 100644
index 0000000000..e8bf4b0846
--- /dev/null
+++ b/source4/libcli/auth/kerberos.c
@@ -0,0 +1,175 @@
+/* 
+   Unix SMB/CIFS implementation.
+   kerberos utility library
+   Copyright (C) Andrew Tridgell 2001
+   Copyright (C) Remus Koos 2001
+   
+   
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2 of the License, or
+   (at your option) any later version.
+   
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+   
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#ifdef HAVE_KRB5
+
+/*
+  we use a prompter to avoid a crash bug in the kerberos libs when 
+  dealing with empty passwords
+  this prompter is just a string copy ...
+*/
+static krb5_error_code 
+kerb_prompter(krb5_context ctx, void *data,
+	       const char *name,
+	       const char *banner,
+	       int num_prompts,
+	       krb5_prompt prompts[])
+{
+	if (num_prompts == 0) return 0;
+
+	memset(prompts[0].reply->data, 0, prompts[0].reply->length);
+	if (prompts[0].reply->length > 0) {
+		if (data) {
+			strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
+			prompts[0].reply->length = strlen(prompts[0].reply->data);
+		} else {
+			prompts[0].reply->length = 0;
+		}
+	}
+	return 0;
+}
+
+/*
+  simulate a kinit, putting the tgt in the default cache location
+  remus@snapserver.com
+*/
+int kerberos_kinit_password(const char *principal, const char *password, int time_offset, time_t *expire_time)
+{
+	krb5_context ctx = NULL;
+	krb5_error_code code = 0;
+	krb5_ccache cc = NULL;
+	krb5_principal me;
+	krb5_creds my_creds;
+
+	if ((code = krb5_init_context(&ctx)))
+		return code;
+
+	if (time_offset != 0) {
+		krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
+	}
+	
+	if ((code = krb5_cc_default(ctx, &cc))) {
+		krb5_free_context(ctx);
+		return code;
+	}
+	
+	if ((code = krb5_parse_name(ctx, principal, &me))) {
+		krb5_free_context(ctx);	
+		return code;
+	}
+	
+	if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, NULL, 
+						 kerb_prompter, 
+						 password, 0, NULL, NULL))) {
+		krb5_free_principal(ctx, me);
+		krb5_free_context(ctx);		
+		return code;
+	}
+	
+	if ((code = krb5_cc_initialize(ctx, cc, me))) {
+		krb5_free_cred_contents(ctx, &my_creds);
+		krb5_free_principal(ctx, me);
+		krb5_free_context(ctx);		
+		return code;
+	}
+	
+	if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
+		krb5_cc_close(ctx, cc);
+		krb5_free_cred_contents(ctx, &my_creds);
+		krb5_free_principal(ctx, me);
+		krb5_free_context(ctx);		
+		return code;
+	}
+	
+	if (expire_time)
+		*expire_time = (time_t) my_creds.times.endtime;
+
+	krb5_cc_close(ctx, cc);
+	krb5_free_cred_contents(ctx, &my_creds);
+	krb5_free_principal(ctx, me);
+	krb5_free_context(ctx);		
+	
+	return 0;
+}
+
+
+
+/* run kinit to setup our ccache */
+int ads_kinit_password(ADS_STRUCT *ads)
+{
+	char *s;
+	int ret;
+
+	if (asprintf(&s, "%s@%s", ads->auth.user_name, ads->auth.realm) == -1) {
+		return KRB5_CC_NOMEM;
+	}
+
+	if (!ads->auth.password) {
+		return KRB5_LIBOS_CANTREADPWD;
+	}
+	
+	ret = kerberos_kinit_password(s, ads->auth.password, ads->auth.time_offset, &ads->auth.expire);
+
+	if (ret) {
+		DEBUG(0,("kerberos_kinit_password %s failed: %s\n", 
+			 s, error_message(ret)));
+	}
+	free(s);
+	return ret;
+}
+
+int ads_kdestroy(const char *cc_name)
+{
+	krb5_error_code code;
+	krb5_context ctx = NULL;
+	krb5_ccache cc = NULL;
+
+	if ((code = krb5_init_context (&ctx))) {
+		DEBUG(3, ("ads_kdestroy: kdb5_init_context rc=%d\n", code));
+		return code;
+	}
+  
+	if (!cc_name) {
+		if ((code = krb5_cc_default(ctx, &cc))) {
+			krb5_free_context(ctx);
+			return code;
+		}
+	} else {
+		if ((code = krb5_cc_resolve(ctx, cc_name, &cc))) {
+			DEBUG(3, ("ads_kdestroy: krb5_cc_resolve rc=%d\n",
+				  code));
+			krb5_free_context(ctx);
+			return code;
+		}
+	}
+
+	if ((code = krb5_cc_destroy (ctx, cc))) {
+		DEBUG(3, ("ads_kdestroy: krb5_cc_destroy rc=%d\n", code));
+	}
+
+	krb5_free_context (ctx);
+	return code;
+}
+
+#endif