r19604: This is a massive commit, and I appologise in advance for it's size.

This merges Samba4 with lorikeet-heimdal, which itself has been
tracking Heimdal CVS for the past couple of weeks.

This is such a big change because Heimdal reorganised it's internal
structures, with the mechglue merge, and because many of our 'wishes' have been granted:  we now have DCE_STYLE GSSAPI, send_to_kdc hooks and many other features merged into the mainline code.  We have adapted to upstream's choice of API in these cases.

In gensec_gssapi and gensec_krb5, we either expect a valid PAC, or NO
PAC.  This matches windows behavour.  We also have an option to
require the PAC to be present (which allows us to automate the testing
of this code).

This also includes a restructure of how the kerberos dependencies are
handled, due to the fallout of the merge.

Andrew Bartlett
(This used to be commit 4826f1735197c2a471d771495e6d4c1051b4c471)

1 files changed, 324 insertions, 0 deletions

diff --git a/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c b/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c
new file mode 100644
index 0000000000..3d01ba69d4
--- /dev/null
+++ b/source4/heimdal/lib/gssapi/mech/gss_mech_switch.c
@@ -0,0 +1,324 @@
+/*-
+ * Copyright (c) 2005 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	$FreeBSD: src/lib/libgssapi/gss_mech_switch.c,v 1.2 2006/02/04 09:40:21 dfr Exp $
+ */
+
+#include "mech_locl.h"
+#include <heim_threads.h>
+RCSID("$Id: gss_mech_switch.c,v 1.7 2006/10/09 11:13:30 lha Exp $");
+
+#ifndef _PATH_GSS_MECH
+#define _PATH_GSS_MECH	"/etc/gss/mech"
+#endif
+
+struct _gss_mech_switch_list _gss_mechs = { NULL } ;
+gss_OID_set _gss_mech_oids;
+static HEIMDAL_MUTEX _gss_mech_mutex = HEIMDAL_MUTEX_INITIALIZER;
+
+/*
+ * Convert a string containing an OID in 'dot' form
+ * (e.g. 1.2.840.113554.1.2.2) to a gss_OID.
+ */
+static int
+_gss_string_to_oid(const char* s, gss_OID oid)
+{
+	int			number_count, i, j;
+	int			byte_count;
+	const char		*p, *q;
+	char			*res;
+
+	/*
+	 * First figure out how many numbers in the oid, then
+	 * calculate the compiled oid size.
+	 */
+	number_count = 0;
+	for (p = s; p; p = q) {
+		q = strchr(p, '.');
+		if (q) q = q + 1;
+		number_count++;
+	}
+	
+	/*
+	 * The first two numbers are in the first byte and each
+	 * subsequent number is encoded in a variable byte sequence.
+	 */
+	if (number_count < 2)
+		return (EINVAL);
+
+	/*
+	 * We do this in two passes. The first pass, we just figure
+	 * out the size. Second time around, we actually encode the
+	 * number.
+	 */
+	res = 0;
+	for (i = 0; i < 2; i++) {
+		byte_count = 0;
+		for (p = s, j = 0; p; p = q, j++) {
+			unsigned int number = 0;
+
+			/*
+			 * Find the end of this number.
+			 */
+			q = strchr(p, '.');
+			if (q) q = q + 1;
+
+			/*
+			 * Read the number of of the string. Don't
+			 * bother with anything except base ten.
+			 */
+			while (*p && *p != '.') {
+				number = 10 * number + (*p - '0');
+				p++;
+			}
+
+			/*
+			 * Encode the number. The first two numbers
+			 * are packed into the first byte. Subsequent
+			 * numbers are encoded in bytes seven bits at
+			 * a time with the last byte having the high
+			 * bit set.
+			 */
+			if (j == 0) {
+				if (res)
+					*res = number * 40;
+			} else if (j == 1) {
+				if (res) {
+					*res += number;
+					res++;
+				}
+				byte_count++;
+			} else if (j >= 2) {
+				/*
+				 * The number is encoded in seven bit chunks.
+				 */
+				unsigned int t;
+				int bytes;
+
+				bytes = 0;
+				for (t = number; t; t >>= 7)
+					bytes++;
+				if (bytes == 0) bytes = 1;
+				while (bytes) {
+					if (res) {
+						int bit = 7*(bytes-1);
+						
+						*res = (number >> bit) & 0x7f;
+						if (bytes != 1)
+							*res |= 0x80;
+						res++;
+					}
+					byte_count++;
+					bytes--;
+				}
+			}
+		}
+		if (!res) {
+			res = malloc(byte_count);
+			if (!res)
+				return (ENOMEM);
+			oid->length = byte_count;
+			oid->elements = res;
+		}
+	}
+
+	return (0);
+}
+
+#define SYM(name)							\
+do {									\
+	m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name);		\
+	if (!m->gm_mech.gm_ ## name) {					\
+		fprintf(stderr, "can't find symbol gss_" #name "\n");	\
+		goto bad;						\
+	}								\
+} while (0)
+
+#define OPTSYM(name)							\
+do {									\
+	m->gm_mech.gm_ ## name = dlsym(so, "gss_" #name);			\
+} while (0)
+
+/*
+ *
+ */
+static int
+add_builtin(gssapi_mech_interface mech)
+{
+    struct _gss_mech_switch *m;
+    OM_uint32 minor_status;
+
+    m = malloc(sizeof(*m));
+    if (m == NULL)
+	return 1;
+    m->gm_so = NULL;
+    m->gm_mech = *mech;
+    m->gm_mech_oid = mech->gm_mech_oid; /* XXX */
+    gss_add_oid_set_member(&minor_status,
+			   &m->gm_mech.gm_mech_oid, &_gss_mech_oids);
+
+    SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link);
+    return 0;
+}
+
+/*
+ * Load the mechanisms file (/etc/gss/mech).
+ */
+void
+_gss_load_mech(void)
+{
+	OM_uint32	major_status, minor_status;
+	FILE		*fp;
+	char		buf[256];
+	char		*p;
+	char		*name, *oid, *lib, *kobj;
+	struct _gss_mech_switch *m;
+	void		*so;
+
+
+	HEIMDAL_MUTEX_lock(&_gss_mech_mutex);
+
+	if (SLIST_FIRST(&_gss_mechs)) {
+		HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
+		return;
+	}
+
+	major_status = gss_create_empty_oid_set(&minor_status,
+	    &_gss_mech_oids);
+	if (major_status) {
+		HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
+		return;
+	}
+
+	add_builtin(__gss_krb5_initialize());
+	add_builtin(__gss_spnego_initialize());
+
+	fp = fopen(_PATH_GSS_MECH, "r");
+	if (!fp) {
+/*		perror(_PATH_GSS_MECH); */
+		HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
+		return;
+	}
+
+	while (fgets(buf, sizeof(buf), fp)) {
+		if (*buf == '#')
+			continue;
+		p = buf;
+		name = strsep(&p, "\t\n ");
+		if (p) while (isspace((unsigned char)*p)) p++;
+		oid = strsep(&p, "\t\n ");
+		if (p) while (isspace((unsigned char)*p)) p++;
+		lib = strsep(&p, "\t\n ");
+		if (p) while (isspace((unsigned char)*p)) p++;
+		kobj = strsep(&p, "\t\n ");
+		if (!name || !oid || !lib || !kobj)
+			continue;
+
+#ifndef RTLD_LOCAL
+#define RTLD_LOCAL 0
+#endif
+
+		so = dlopen(lib, RTLD_LOCAL);
+		if (!so) {
+/*			fprintf(stderr, "dlopen: %s\n", dlerror()); */
+			continue;
+		}
+
+		m = malloc(sizeof(*m));
+		if (!m)
+			break;
+		m->gm_so = so;
+		if (_gss_string_to_oid(oid, &m->gm_mech.gm_mech_oid)) {
+			free(m);
+			continue;
+		}
+		
+		major_status = gss_add_oid_set_member(&minor_status,
+		    &m->gm_mech.gm_mech_oid, &_gss_mech_oids);
+		if (major_status) {
+			free(m->gm_mech.gm_mech_oid.elements);
+			free(m);
+			continue;
+		}
+
+		SYM(acquire_cred);
+		SYM(release_cred);
+		SYM(init_sec_context);
+		SYM(accept_sec_context);
+		SYM(process_context_token);
+		SYM(delete_sec_context);
+		SYM(context_time);
+		SYM(get_mic);
+		SYM(verify_mic);
+		SYM(wrap);
+		SYM(unwrap);
+		SYM(display_status);
+		SYM(indicate_mechs);
+		SYM(compare_name);
+		SYM(display_name);
+		SYM(import_name);
+		SYM(export_name);
+		SYM(release_name);
+		SYM(inquire_cred);
+		SYM(inquire_context);
+		SYM(wrap_size_limit);
+		SYM(add_cred);
+		SYM(inquire_cred_by_mech);
+		SYM(export_sec_context);
+		SYM(import_sec_context);
+		SYM(inquire_names_for_mech);
+		SYM(inquire_mechs_for_name);
+		SYM(canonicalize_name);
+		SYM(duplicate_name);
+		OPTSYM(inquire_cred_by_oid);
+		OPTSYM(inquire_sec_context_by_oid);
+		OPTSYM(set_sec_context_option);
+		OPTSYM(set_cred_option);
+
+		SLIST_INSERT_HEAD(&_gss_mechs, m, gm_link);
+		continue;
+
+	bad:
+		free(m->gm_mech.gm_mech_oid.elements);
+		free(m);
+		dlclose(so);
+		continue;
+	}
+	fclose(fp);
+	HEIMDAL_MUTEX_unlock(&_gss_mech_mutex);
+}
+
+gssapi_mech_interface
+__gss_get_mechanism(gss_OID mech)
+{
+        struct _gss_mech_switch	*m;
+
+	_gss_load_mech();
+	SLIST_FOREACH(m, &_gss_mechs, gm_link) {
+		if (gss_oid_equal(&m->gm_mech.gm_mech_oid, mech))
+			return &m->gm_mech;
+	}
+	return NULL;
+}