summaryrefslogtreecommitdiff
path: root/auth-krb5.c
diff options
context:
space:
mode:
authorDamien Miller <djm@mindrot.org>2001-09-25 12:58:23 +1000
committerDamien Miller <djm@mindrot.org>2001-09-25 12:58:23 +1000
commit964fed54cd0fa6b7df1342f010c57f05261dcff2 (patch)
tree7cb0497b4bbfb8aecc2878a82b10844641e6db84 /auth-krb5.c
parentd4d119377d10d4a5df8110119a7c8ca1309dc257 (diff)
- (djm) Pull in auth-krb5.c from OpenBSD CVS. NB. it is not currently used.
Diffstat (limited to 'auth-krb5.c')
-rw-r--r--auth-krb5.c259
1 files changed, 259 insertions, 0 deletions
diff --git a/auth-krb5.c b/auth-krb5.c
new file mode 100644
index 00000000..08c91745
--- /dev/null
+++ b/auth-krb5.c
@@ -0,0 +1,259 @@
+/*
+ * Kerberos v5 authentication and ticket-passing routines.
+ *
+ * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $
+ * $OpenBSD: auth-krb5.c,v 1.1 2001/06/26 16:15:23 dugsong Exp $
+ */
+
+#include "includes.h"
+#include "ssh.h"
+#include "ssh1.h"
+#include "packet.h"
+#include "xmalloc.h"
+#include "log.h"
+#include "servconf.h"
+#include "uidswap.h"
+#include "auth.h"
+
+#ifdef KRB5
+#include <krb5.h>
+
+extern ServerOptions options;
+
+static int
+krb5_init(void *context)
+{
+ Authctxt *authctxt = (Authctxt *)context;
+ krb5_error_code problem;
+ static int cleanup_registered = 0;
+
+ if (authctxt->krb5_ctx == NULL) {
+ problem = krb5_init_context(&authctxt->krb5_ctx);
+ if (problem)
+ return (problem);
+ krb5_init_ets(authctxt->krb5_ctx);
+ }
+ if (!cleanup_registered) {
+ fatal_add_cleanup(krb5_cleanup_proc, authctxt);
+ cleanup_registered = 1;
+ }
+ return (0);
+}
+
+/*
+ * Try krb5 authentication. server_user is passed for logging purposes
+ * only, in auth is received ticket, in client is returned principal
+ * from the ticket
+ */
+int
+auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client)
+{
+ krb5_error_code problem;
+ krb5_principal server;
+ krb5_data reply;
+ krb5_ticket *ticket;
+ int fd;
+
+ server = NULL;
+ ticket = NULL;
+ reply.length = 0;
+
+ problem = krb5_init(authctxt);
+ if (problem)
+ goto err;
+
+ problem = krb5_auth_con_init(authctxt->krb5_ctx,
+ &authctxt->krb5_auth_ctx);
+ if (problem)
+ goto err;
+
+ fd = packet_get_connection_in();
+ problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
+ authctxt->krb5_auth_ctx, &fd);
+ if (problem)
+ goto err;
+
+ problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL ,
+ KRB5_NT_SRV_HST, &server);
+ if (problem)
+ goto err;
+
+ problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
+ auth, server, NULL, NULL, &ticket);
+ if (problem)
+ goto err;
+
+ problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
+ &authctxt->krb5_user);
+ if (problem)
+ goto err;
+
+ /* if client wants mutual auth */
+ problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
+ &reply);
+ if (problem)
+ goto err;
+
+ /* Check .k5login authorization now. */
+ if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
+ authctxt->pw->pw_name))
+ goto err;
+
+ if (client)
+ krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
+ client);
+
+ packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
+ packet_put_string((char *) reply.data, reply.length);
+ packet_send();
+ packet_write_wait();
+
+ err:
+ if (server)
+ krb5_free_principal(authctxt->krb5_ctx, server);
+ if (ticket)
+ krb5_free_ticket(authctxt->krb5_ctx, ticket);
+ if (reply.length)
+ xfree(reply.data);
+
+ if (problem) {
+ debug("Kerberos v5 authentication failed: %s",
+ krb5_get_err_text(authctxt->krb5_ctx, problem));
+ return (0);
+ }
+ return (1);
+}
+
+int
+auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt)
+{
+ krb5_error_code problem;
+ krb5_ccache ccache = NULL;
+ char *pname;
+
+ if (authctxt->pw == NULL || authctxt->krb5_user == NULL)
+ return (0);
+
+ temporarily_use_uid(authctxt->pw);
+
+ problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache);
+ if (problem)
+ goto fail;
+
+ problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
+ authctxt->krb5_user);
+ if (problem)
+ goto fail;
+
+ problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
+ ccache, tgt);
+ if (problem)
+ goto fail;
+
+ authctxt->krb5_fwd_ccache = ccache;
+ ccache = NULL;
+
+ authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
+
+ problem = krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
+ &pname);
+ if (problem)
+ goto fail;
+
+ debug("Kerberos v5 TGT accepted (%s)", pname);
+
+ restore_uid();
+
+ return (1);
+
+ fail:
+ if (problem)
+ debug("Kerberos v5 TGT passing failed: %s",
+ krb5_get_err_text(authctxt->krb5_ctx, problem));
+ if (ccache)
+ krb5_cc_destroy(authctxt->krb5_ctx, ccache);
+
+ restore_uid();
+
+ return (0);
+}
+
+int
+auth_krb5_password(Authctxt *authctxt, const char *password)
+{
+ krb5_error_code problem;
+
+ if (authctxt->pw == NULL)
+ return (0);
+
+ temporarily_use_uid(authctxt->pw);
+
+ problem = krb5_init(authctxt);
+ if (problem)
+ goto out;
+
+ problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
+ &authctxt->krb5_user);
+ if (problem)
+ goto out;
+
+ problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops,
+ &authctxt->krb5_fwd_ccache);
+ if (problem)
+ goto out;
+
+ problem = krb5_cc_initialize(authctxt->krb5_ctx,
+ authctxt->krb5_fwd_ccache, authctxt->krb5_user);
+ if (problem)
+ goto out;
+
+ problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
+ authctxt->krb5_fwd_ccache, password, 1, NULL);
+ if (problem)
+ goto out;
+
+ authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
+
+ out:
+ restore_uid();
+
+ if (problem) {
+ debug("Kerberos password authentication failed: %s",
+ krb5_get_err_text(authctxt->krb5_ctx, problem));
+
+ krb5_cleanup_proc(authctxt);
+
+ if (options.kerberos_or_local_passwd)
+ return (-1);
+ else
+ return (0);
+ }
+ return (1);
+}
+
+void
+krb5_cleanup_proc(void *context)
+{
+ Authctxt *authctxt = (Authctxt *)context;
+
+ debug("krb5_cleanup_proc called");
+ if (authctxt->krb5_fwd_ccache) {
+ krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
+ authctxt->krb5_fwd_ccache = NULL;
+ }
+ if (authctxt->krb5_user) {
+ krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
+ authctxt->krb5_user = NULL;
+ }
+ if (authctxt->krb5_auth_ctx) {
+ krb5_auth_con_free(authctxt->krb5_ctx,
+ authctxt->krb5_auth_ctx);
+ authctxt->krb5_auth_ctx = NULL;
+ }
+ if (authctxt->krb5_ctx) {
+ krb5_free_context(authctxt->krb5_ctx);
+ authctxt->krb5_ctx = NULL;
+ }
+}
+
+#endif /* KRB5 */