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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-19 17:20:00 +0000
commit8daa83a594a2e98f39d764422bfbdbc62c9efd44 (patch)
tree4099e8021376c7d8c05bdf8503093d80e9c7bad0 /lib/afs/afs_funcs.c
parentInitial commit. (diff)
downloadsamba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.tar.xz
samba-8daa83a594a2e98f39d764422bfbdbc62c9efd44.zip
Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/afs/afs_funcs.c')
-rw-r--r--lib/afs/afs_funcs.c313
1 files changed, 313 insertions, 0 deletions
diff --git a/lib/afs/afs_funcs.c b/lib/afs/afs_funcs.c
new file mode 100644
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+++ b/lib/afs/afs_funcs.c
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+/*
+ * Unix SMB/CIFS implementation.
+ * Generate AFS tickets
+ * Copyright (C) Volker Lendecke 2003
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "includes.h"
+#include "lib/afs/afs_funcs.h"
+
+#ifdef WITH_FAKE_KASERVER
+
+#define NO_ASN1_TYPEDEFS 1
+
+#include "secrets.h"
+#include "passdb.h"
+#include "auth.h"
+#include "../librpc/gen_ndr/ndr_netlogon.h"
+#include "lib/afs/afs_settoken.h"
+
+#include <afs/param.h>
+#include <afs/stds.h>
+#include <afs/auth.h>
+#include <afs/venus.h>
+#include <asm/unistd.h>
+#include <openssl/des.h>
+
+struct ClearToken {
+ uint32 AuthHandle;
+ char HandShakeKey[8];
+ uint32 ViceId;
+ uint32 BeginTimestamp;
+ uint32 EndTimestamp;
+};
+
+static char *afs_encode_token(const char *cell, const DATA_BLOB ticket,
+ const struct ClearToken *ct)
+{
+ char *base64_ticket;
+ char *result = NULL;
+
+ DATA_BLOB key = data_blob(ct->HandShakeKey, 8);
+ char *base64_key;
+ TALLOC_CTX *mem_ctx;
+
+ mem_ctx = talloc_stackframe();
+ if (mem_ctx == NULL)
+ goto done;
+
+ base64_ticket = base64_encode_data_blob(mem_ctx, ticket);
+ if (base64_ticket == NULL)
+ goto done;
+
+ base64_key = base64_encode_data_blob(mem_ctx, key);
+ if (base64_key == NULL)
+ goto done;
+
+ asprintf(&result, "%s\n%u\n%s\n%u\n%u\n%u\n%s\n", cell,
+ ct->AuthHandle, base64_key, ct->ViceId, ct->BeginTimestamp,
+ ct->EndTimestamp, base64_ticket);
+
+ DEBUG(10, ("Got ticket string:\n%s\n", result));
+
+done:
+ TALLOC_FREE(mem_ctx);
+
+ return result;
+}
+
+/* Create a ClearToken and an encrypted ticket. ClearToken has not yet the
+ * ViceId set, this should be set by the caller. */
+
+static bool afs_createtoken(const char *username, const char *cell,
+ DATA_BLOB *ticket, struct ClearToken *ct)
+{
+ fstring clear_ticket;
+ char *p = clear_ticket;
+ uint32 len;
+ uint32 now;
+
+ struct afs_key key;
+ des_key_schedule key_schedule;
+
+ if (!secrets_init())
+ return false;
+
+ if (!secrets_fetch_afs_key(cell, &key)) {
+ DEBUG(1, ("Could not fetch AFS service key\n"));
+ return false;
+ }
+
+ ct->AuthHandle = key.kvno;
+
+ /* Build the ticket. This is going to be encrypted, so in our
+ way we fill in ct while we still have the unencrypted
+ form. */
+
+ p = clear_ticket;
+
+ /* The byte-order */
+ *p = 1;
+ p += 1;
+
+ /* "Alice", the client username */
+ strncpy(p, username, sizeof(clear_ticket)-PTR_DIFF(p,clear_ticket)-1);
+ p += strlen(p)+1;
+ strncpy(p, "", sizeof(clear_ticket)-PTR_DIFF(p,clear_ticket)-1);
+ p += strlen(p)+1;
+ strncpy(p, cell, sizeof(clear_ticket)-PTR_DIFF(p,clear_ticket)-1);
+ p += strlen(p)+1;
+
+ /* Alice's network layer address. At least Openafs-1.2.10
+ ignores this, so we fill in a dummy value here. */
+ SIVAL(p, 0, 0);
+ p += 4;
+
+ /* We need to create a session key */
+ generate_random_buffer((uint8_t *)p, 8);
+
+ /* Our client code needs the the key in the clear, it does not
+ know the server-key ... */
+ memcpy(ct->HandShakeKey, p, 8);
+
+ p += 8;
+
+ /* This is a kerberos 4 life time. The life time is expressed
+ * in units of 5 minute intervals up to 38400 seconds, after
+ * that a table is used up to lifetime 0xBF. Values between
+ * 0xC0 and 0xFF is undefined. 0xFF is defined to be the
+ * infinite time that never expire.
+ *
+ * So here we cheat and use the infinite time */
+ *p = 255;
+ p += 1;
+
+ /* Ticket creation time */
+ now = time(NULL);
+ SIVAL(p, 0, now);
+ ct->BeginTimestamp = now;
+
+ if(lp_afs_token_lifetime() == 0)
+ ct->EndTimestamp = NEVERDATE;
+ else
+ ct->EndTimestamp = now + lp_afs_token_lifetime();
+
+ if (((ct->EndTimestamp - ct->BeginTimestamp) & 1) == 1) {
+ ct->BeginTimestamp += 1; /* Lifetime must be even */
+ }
+ p += 4;
+
+ /* And here comes Bob's name and instance, in this case the
+ AFS server. */
+ strncpy(p, "afs", sizeof(clear_ticket)-PTR_DIFF(p,clear_ticket)-1);
+ p += strlen(p)+1;
+ strncpy(p, "", sizeof(clear_ticket)-PTR_DIFF(p,clear_ticket)-1);
+ p += strlen(p)+1;
+
+ /* And zero-pad to a multiple of 8 bytes */
+ len = PTR_DIFF(p, clear_ticket);
+ if (len & 7) {
+ uint32 extra_space = 8-(len & 7);
+ memset(p, 0, extra_space);
+ p+=extra_space;
+ }
+ len = PTR_DIFF(p, clear_ticket);
+
+ des_key_sched((const_des_cblock *)key.key, key_schedule);
+ des_pcbc_encrypt((const unsigned char*) clear_ticket,
+ (unsigned char*) clear_ticket,
+ len, key_schedule, (C_Block *)key.key, 1);
+
+ ZERO_STRUCT(key);
+
+ *ticket = data_blob(clear_ticket, len);
+
+ return true;
+}
+
+char *afs_createtoken_str(const char *username, const char *cell)
+{
+ DATA_BLOB ticket;
+ struct ClearToken ct;
+ char *result;
+
+ if (!afs_createtoken(username, cell, &ticket, &ct))
+ return NULL;
+
+ result = afs_encode_token(cell, ticket, &ct);
+
+ data_blob_free(&ticket);
+
+ return result;
+}
+
+/*
+ This routine takes a radical approach completely bypassing the
+ Kerberos idea of security and using AFS simply as an intelligent
+ file backend. Samba has persuaded itself somehow that the user is
+ actually correctly identified and then we create a ticket that the
+ AFS server hopefully accepts using its KeyFile that the admin has
+ kindly stored to our secrets.tdb.
+
+ Thanks to the book "Network Security -- PRIVATE Communication in a
+ PUBLIC World" by Charlie Kaufman, Radia Perlman and Mike Speciner
+ Kerberos 4 tickets are not really hard to construct.
+
+ For the comments "Alice" is the User to be auth'ed, and "Bob" is the
+ AFS server. */
+
+bool afs_login(connection_struct *conn)
+{
+ const struct loadparm_substitution *lp_sub =
+ loadparm_s3_global_substitution();
+ DATA_BLOB ticket;
+ char *afs_username = NULL;
+ char *cell = NULL;
+ bool result;
+ char *ticket_str = NULL;
+ const struct dom_sid *user_sid;
+ TALLOC_CTX *ctx = talloc_tos();
+ struct dom_sid_buf buf;
+
+ struct ClearToken ct;
+
+ afs_username = talloc_strdup(ctx,
+ lp_afs_username_map());
+ if (!afs_username) {
+ return false;
+ }
+
+ afs_username = talloc_sub_advanced(ctx,
+ lp_servicename(ctx, lp_sub, SNUM(conn)),
+ conn->session_info->unix_info->unix_name,
+ conn->connectpath,
+ conn->session_info->unix_token->gid,
+ conn->session_info->unix_info->sanitized_username,
+ conn->session_info->info->domain_name,
+ afs_username);
+ if (!afs_username) {
+ return false;
+ }
+
+ user_sid = &conn->session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
+ afs_username = talloc_string_sub(talloc_tos(),
+ afs_username,
+ "%s",
+ dom_sid_str_buf(user_sid, &buf));
+ if (!afs_username) {
+ return false;
+ }
+
+ /* The pts command always generates completely lower-case user
+ * names. */
+ if (!strlower_m(afs_username)) {
+ return false;
+ }
+
+ cell = strchr(afs_username, '@');
+
+ if (cell == NULL) {
+ DEBUG(1, ("AFS username doesn't contain a @, "
+ "could not find cell\n"));
+ return false;
+ }
+
+ *cell = '\0';
+ cell += 1;
+
+ DEBUG(10, ("Trying to log into AFS for user %s@%s\n",
+ afs_username, cell));
+
+ if (!afs_createtoken(afs_username, cell, &ticket, &ct))
+ return false;
+
+ /* For which Unix-UID do we want to set the token? */
+ ct.ViceId = getuid();
+
+ ticket_str = afs_encode_token(cell, ticket, &ct);
+
+ result = afs_settoken_str(ticket_str);
+
+ SAFE_FREE(ticket_str);
+
+ data_blob_free(&ticket);
+
+ return result;
+}
+
+#else
+
+bool afs_login(connection_struct *conn)
+{
+ return true;
+}
+
+char *afs_createtoken_str(const char *username, const char *cell)
+{
+ return NULL;
+}
+
+#endif /* WITH_FAKE_KASERVER */