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-rw-r--r--source4/auth/kerberos/krb5_init_context.c482
1 files changed, 482 insertions, 0 deletions
diff --git a/source4/auth/kerberos/krb5_init_context.c b/source4/auth/kerberos/krb5_init_context.c
new file mode 100644
index 0000000000..82e42a4560
--- /dev/null
+++ b/source4/auth/kerberos/krb5_init_context.c
@@ -0,0 +1,482 @@
+/*
+ Unix SMB/CIFS implementation.
+ Wrapper for krb5_init_context
+
+ Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
+ Copyright (C) Andrew Tridgell 2005
+ Copyright (C) Stefan Metzmacher 2004
+
+ 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 "system/kerberos.h"
+#include "auth/kerberos/kerberos.h"
+#include "lib/socket/socket.h"
+#include "lib/stream/packet.h"
+#include "system/network.h"
+#include "lib/events/events.h"
+#include "param/param.h"
+#include "libcli/resolve/resolve.h"
+
+/*
+ context structure for operations on cldap packets
+*/
+struct smb_krb5_socket {
+ struct socket_context *sock;
+
+ /* the fd event */
+ struct fd_event *fde;
+
+ NTSTATUS status;
+ DATA_BLOB request, reply;
+
+ struct packet_context *packet;
+
+ size_t partial_read;
+
+ krb5_krbhst_info *hi;
+};
+
+static int smb_krb5_context_destroy_1(struct smb_krb5_context *ctx)
+{
+ krb5_free_context(ctx->krb5_context);
+ return 0;
+}
+
+static int smb_krb5_context_destroy_2(struct smb_krb5_context *ctx)
+{
+ /* Otherwise krb5_free_context will try and close what we have already free()ed */
+ krb5_set_warn_dest(ctx->krb5_context, NULL);
+ krb5_closelog(ctx->krb5_context, ctx->logf);
+ smb_krb5_context_destroy_1(ctx);
+ return 0;
+}
+
+/* We never close down the DEBUG system, and no need to unreference the use */
+static void smb_krb5_debug_close(void *private) {
+ return;
+}
+
+static void smb_krb5_debug_wrapper(const char *timestr, const char *msg, void *private)
+{
+ DEBUG(2, ("Kerberos: %s\n", msg));
+}
+
+/*
+ handle recv events on a smb_krb5 socket
+*/
+static void smb_krb5_socket_recv(struct smb_krb5_socket *smb_krb5)
+{
+ TALLOC_CTX *tmp_ctx = talloc_new(smb_krb5);
+ DATA_BLOB blob;
+ size_t nread, dsize;
+
+ smb_krb5->status = socket_pending(smb_krb5->sock, &dsize);
+ if (!NT_STATUS_IS_OK(smb_krb5->status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ blob = data_blob_talloc(tmp_ctx, NULL, dsize);
+ if (blob.data == NULL && dsize != 0) {
+ smb_krb5->status = NT_STATUS_NO_MEMORY;
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ smb_krb5->status = socket_recv(smb_krb5->sock, blob.data, blob.length, &nread);
+ if (!NT_STATUS_IS_OK(smb_krb5->status)) {
+ talloc_free(tmp_ctx);
+ return;
+ }
+ blob.length = nread;
+
+ if (nread == 0) {
+ smb_krb5->status = NT_STATUS_UNEXPECTED_NETWORK_ERROR;
+ talloc_free(tmp_ctx);
+ return;
+ }
+
+ DEBUG(2,("Received smb_krb5 packet of length %d\n",
+ (int)blob.length));
+
+ talloc_steal(smb_krb5, blob.data);
+ smb_krb5->reply = blob;
+ talloc_free(tmp_ctx);
+}
+
+static NTSTATUS smb_krb5_full_packet(void *private, DATA_BLOB data)
+{
+ struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
+ talloc_steal(smb_krb5, data.data);
+ smb_krb5->reply = data;
+ smb_krb5->reply.length -= 4;
+ smb_krb5->reply.data += 4;
+ return NT_STATUS_OK;
+}
+
+/*
+ handle request timeouts
+*/
+static void smb_krb5_request_timeout(struct event_context *event_ctx,
+ struct timed_event *te, struct timeval t,
+ void *private)
+{
+ struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
+ DEBUG(5,("Timed out smb_krb5 packet\n"));
+ smb_krb5->status = NT_STATUS_IO_TIMEOUT;
+}
+
+static void smb_krb5_error_handler(void *private, NTSTATUS status)
+{
+ struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
+ smb_krb5->status = status;
+}
+
+/*
+ handle send events on a smb_krb5 socket
+*/
+static void smb_krb5_socket_send(struct smb_krb5_socket *smb_krb5)
+{
+ NTSTATUS status;
+
+ size_t len;
+
+ len = smb_krb5->request.length;
+ status = socket_send(smb_krb5->sock, &smb_krb5->request, &len);
+
+ if (!NT_STATUS_IS_OK(status)) return;
+
+ EVENT_FD_READABLE(smb_krb5->fde);
+
+ EVENT_FD_NOT_WRITEABLE(smb_krb5->fde);
+ return;
+}
+
+
+/*
+ handle fd events on a smb_krb5_socket
+*/
+static void smb_krb5_socket_handler(struct event_context *ev, struct fd_event *fde,
+ uint16_t flags, void *private)
+{
+ struct smb_krb5_socket *smb_krb5 = talloc_get_type(private, struct smb_krb5_socket);
+ switch (smb_krb5->hi->proto) {
+ case KRB5_KRBHST_UDP:
+ if (flags & EVENT_FD_READ) {
+ smb_krb5_socket_recv(smb_krb5);
+ return;
+ }
+ if (flags & EVENT_FD_WRITE) {
+ smb_krb5_socket_send(smb_krb5);
+ return;
+ }
+ /* not reached */
+ return;
+ case KRB5_KRBHST_TCP:
+ if (flags & EVENT_FD_READ) {
+ packet_recv(smb_krb5->packet);
+ return;
+ }
+ if (flags & EVENT_FD_WRITE) {
+ packet_queue_run(smb_krb5->packet);
+ return;
+ }
+ /* not reached */
+ return;
+ case KRB5_KRBHST_HTTP:
+ /* can't happen */
+ break;
+ }
+}
+
+
+krb5_error_code smb_krb5_send_and_recv_func(krb5_context context,
+ void *data,
+ krb5_krbhst_info *hi,
+ time_t timeout,
+ const krb5_data *send_buf,
+ krb5_data *recv_buf)
+{
+ krb5_error_code ret;
+ NTSTATUS status;
+ struct socket_address *remote_addr;
+ const char *name;
+ struct addrinfo *ai, *a;
+ struct smb_krb5_socket *smb_krb5;
+
+ struct event_context *ev = talloc_get_type(data, struct event_context);
+
+ DATA_BLOB send_blob = data_blob_const(send_buf->data, send_buf->length);
+
+ ret = krb5_krbhst_get_addrinfo(context, hi, &ai);
+ if (ret) {
+ return ret;
+ }
+
+ for (a = ai; a; a = ai->ai_next) {
+ smb_krb5 = talloc(NULL, struct smb_krb5_socket);
+ if (!smb_krb5) {
+ return ENOMEM;
+ }
+ smb_krb5->hi = hi;
+
+ switch (a->ai_family) {
+ case PF_INET:
+ name = "ipv4";
+ break;
+#ifdef HAVE_IPV6
+ case PF_INET6:
+ name = "ipv6";
+ break;
+#endif
+ default:
+ talloc_free(smb_krb5);
+ return EINVAL;
+ }
+
+ status = NT_STATUS_INVALID_PARAMETER;
+ switch (hi->proto) {
+ case KRB5_KRBHST_UDP:
+ if (lp_parm_bool(global_loadparm, NULL, "krb5", "udp", true)) {
+ status = socket_create(name, SOCKET_TYPE_DGRAM, &smb_krb5->sock, 0);
+ }
+ break;
+ case KRB5_KRBHST_TCP:
+ if (lp_parm_bool(global_loadparm, NULL, "krb5", "tcp", true)) {
+ status = socket_create(name, SOCKET_TYPE_STREAM, &smb_krb5->sock, 0);
+ }
+ break;
+ case KRB5_KRBHST_HTTP:
+ talloc_free(smb_krb5);
+ return EINVAL;
+ }
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(smb_krb5);
+ continue;
+ }
+
+ talloc_steal(smb_krb5, smb_krb5->sock);
+
+ remote_addr = socket_address_from_sockaddr(smb_krb5, a->ai_addr, a->ai_addrlen);
+ if (!remote_addr) {
+ talloc_free(smb_krb5);
+ continue;
+ }
+
+ status = socket_connect_ev(smb_krb5->sock, NULL, remote_addr, 0,
+ NULL, ev);
+ if (!NT_STATUS_IS_OK(status)) {
+ talloc_free(smb_krb5);
+ continue;
+ }
+ talloc_free(remote_addr);
+
+ /* Setup the FDE, start listening for read events
+ * from the start (otherwise we may miss a socket
+ * drop) and mark as AUTOCLOSE along with the fde */
+
+ /* Ths is equivilant to EVENT_FD_READABLE(smb_krb5->fde) */
+ smb_krb5->fde = event_add_fd(ev, smb_krb5->sock,
+ socket_get_fd(smb_krb5->sock),
+ EVENT_FD_READ|EVENT_FD_AUTOCLOSE,
+ smb_krb5_socket_handler, smb_krb5);
+ /* its now the job of the event layer to close the socket */
+ socket_set_flags(smb_krb5->sock, SOCKET_FLAG_NOCLOSE);
+
+ event_add_timed(ev, smb_krb5,
+ timeval_current_ofs(timeout, 0),
+ smb_krb5_request_timeout, smb_krb5);
+
+
+ smb_krb5->status = NT_STATUS_OK;
+ smb_krb5->reply = data_blob(NULL, 0);
+
+ switch (hi->proto) {
+ case KRB5_KRBHST_UDP:
+ EVENT_FD_WRITEABLE(smb_krb5->fde);
+ smb_krb5->request = send_blob;
+ break;
+ case KRB5_KRBHST_TCP:
+
+ smb_krb5->packet = packet_init(smb_krb5);
+ if (smb_krb5->packet == NULL) {
+ talloc_free(smb_krb5);
+ return ENOMEM;
+ }
+ packet_set_private(smb_krb5->packet, smb_krb5);
+ packet_set_socket(smb_krb5->packet, smb_krb5->sock);
+ packet_set_callback(smb_krb5->packet, smb_krb5_full_packet);
+ packet_set_full_request(smb_krb5->packet, packet_full_request_u32);
+ packet_set_error_handler(smb_krb5->packet, smb_krb5_error_handler);
+ packet_set_event_context(smb_krb5->packet, ev);
+ packet_set_fde(smb_krb5->packet, smb_krb5->fde);
+
+ smb_krb5->request = data_blob_talloc(smb_krb5, NULL, send_blob.length + 4);
+ RSIVAL(smb_krb5->request.data, 0, send_blob.length);
+ memcpy(smb_krb5->request.data+4, send_blob.data, send_blob.length);
+ packet_send(smb_krb5->packet, smb_krb5->request);
+ break;
+ case KRB5_KRBHST_HTTP:
+ talloc_free(smb_krb5);
+ return EINVAL;
+ }
+ while ((NT_STATUS_IS_OK(smb_krb5->status)) && !smb_krb5->reply.length) {
+ if (event_loop_once(ev) != 0) {
+ talloc_free(smb_krb5);
+ return EINVAL;
+ }
+ }
+ if (NT_STATUS_EQUAL(smb_krb5->status, NT_STATUS_IO_TIMEOUT)) {
+ talloc_free(smb_krb5);
+ continue;
+ }
+
+ if (!NT_STATUS_IS_OK(smb_krb5->status)) {
+ DEBUG(2,("Error reading smb_krb5 reply packet: %s\n", nt_errstr(smb_krb5->status)));
+ talloc_free(smb_krb5);
+ continue;
+ }
+
+ ret = krb5_data_copy(recv_buf, smb_krb5->reply.data, smb_krb5->reply.length);
+ if (ret) {
+ talloc_free(smb_krb5);
+ return ret;
+ }
+ talloc_free(smb_krb5);
+
+ break;
+ }
+ if (a) {
+ return 0;
+ }
+ return KRB5_KDC_UNREACH;
+}
+
+krb5_error_code smb_krb5_init_context(void *parent_ctx,
+ struct event_context *ev,
+ struct loadparm_context *lp_ctx,
+ struct smb_krb5_context **smb_krb5_context)
+{
+ krb5_error_code ret;
+ TALLOC_CTX *tmp_ctx;
+ char **config_files;
+ const char *config_file;
+
+ initialize_krb5_error_table();
+
+ tmp_ctx = talloc_new(parent_ctx);
+ *smb_krb5_context = talloc(tmp_ctx, struct smb_krb5_context);
+
+ if (!*smb_krb5_context || !tmp_ctx) {
+ talloc_free(tmp_ctx);
+ return ENOMEM;
+ }
+
+ ret = krb5_init_context(&(*smb_krb5_context)->krb5_context);
+ if (ret) {
+ DEBUG(1,("krb5_init_context failed (%s)\n",
+ error_message(ret)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_1);
+
+ config_file = config_path(tmp_ctx, lp_ctx, "krb5.conf");
+ if (!config_file) {
+ talloc_free(tmp_ctx);
+ return ENOMEM;
+ }
+
+ /* Use our local krb5.conf file by default */
+ ret = krb5_prepend_config_files_default(config_file == NULL?"":config_file, &config_files);
+ if (ret) {
+ DEBUG(1,("krb5_prepend_config_files_default failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ ret = krb5_set_config_files((*smb_krb5_context)->krb5_context,
+ config_files);
+ krb5_free_config_files(config_files);
+ if (ret) {
+ DEBUG(1,("krb5_set_config_files failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ if (lp_realm(lp_ctx) && *lp_realm(lp_ctx)) {
+ char *upper_realm = strupper_talloc(tmp_ctx, lp_realm(lp_ctx));
+ if (!upper_realm) {
+ DEBUG(1,("gensec_krb5_start: could not uppercase realm: %s\n", lp_realm(lp_ctx)));
+ talloc_free(tmp_ctx);
+ return ENOMEM;
+ }
+ ret = krb5_set_default_realm((*smb_krb5_context)->krb5_context, upper_realm);
+ if (ret) {
+ DEBUG(1,("krb5_set_default_realm failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+ }
+
+ /* TODO: Should we have a different name here? */
+ ret = krb5_initlog((*smb_krb5_context)->krb5_context, "Samba", &(*smb_krb5_context)->logf);
+
+ if (ret) {
+ DEBUG(1,("krb5_initlog failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ talloc_set_destructor(*smb_krb5_context, smb_krb5_context_destroy_2);
+
+ ret = krb5_addlog_func((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf, 0 /* min */, -1 /* max */,
+ smb_krb5_debug_wrapper, smb_krb5_debug_close, NULL);
+ if (ret) {
+ DEBUG(1,("krb5_addlog_func failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+ krb5_set_warn_dest((*smb_krb5_context)->krb5_context, (*smb_krb5_context)->logf);
+
+ /* Set use of our socket lib */
+ ret = krb5_set_send_to_kdc_func((*smb_krb5_context)->krb5_context,
+ smb_krb5_send_and_recv_func,
+ ev);
+ if (ret) {
+ DEBUG(1,("krb5_set_send_recv_func failed (%s)\n",
+ smb_get_krb5_error_message((*smb_krb5_context)->krb5_context, ret, tmp_ctx)));
+ talloc_free(tmp_ctx);
+ return ret;
+ }
+
+ talloc_steal(parent_ctx, *smb_krb5_context);
+ talloc_free(tmp_ctx);
+
+ /* Set options in kerberos */
+
+ krb5_set_dns_canonicalize_hostname((*smb_krb5_context)->krb5_context,
+ lp_parm_bool(lp_ctx, NULL, "krb5", "set_dns_canonicalize", false));
+
+ return 0;
+}
+
generated by cgit (git 2.34.1) at 2025-04-11 17:22:35 +0000