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authorGünther Deschner <gd@samba.org>2008-10-13 17:22:37 +0200
committerGünther Deschner <gd@samba.org>2009-11-06 12:43:03 +0100
commit35dcc133c9c26d10186fe59ea096a2a5c87958e6 (patch)
treea1b8a56e808366d2e7529056e4e926539526759f
parent0729df3661fefeffc5154c9b01ae027b3ede4b92 (diff)
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s3-kerberos: add smb_krb5_get_{creds,credentials} incl. support for S4U2SELF impersonation.
Guenther
-rw-r--r--source3/configure.in3
-rw-r--r--source3/include/includes.h12
-rw-r--r--source3/libsmb/clikrb5.c271
3 files changed, 284 insertions, 2 deletions
diff --git a/source3/configure.in b/source3/configure.in
index 755fd0ed1a..aab8c01473 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -3441,6 +3441,9 @@ if test x"$with_ads_support" != x"no"; then
AC_CHECK_FUNC_EXT(krb5_get_creds_opt_alloc, $KRB5_LIBS)
AC_CHECK_FUNC_EXT(krb5_get_creds_opt_set_impersonate, $KRB5_LIBS)
AC_CHECK_FUNC_EXT(krb5_get_creds, $KRB5_LIBS)
+ AC_CHECK_FUNC_EXT(krb5_get_credentials_for_user, $KRB5_LIBS)
+ # MIT krb5 1.8 does not expose this call (yet)
+ AC_CHECK_DECLS(krb5_get_credentials_for_user, [], [], [#include <krb5.h>])
# MIT krb5 1.7beta3 (in Ubuntu Karmic) does not have this declaration
# but does have the symbol
diff --git a/source3/include/includes.h b/source3/include/includes.h
index 796a729d6a..559bc3dc18 100644
--- a/source3/include/includes.h
+++ b/source3/include/includes.h
@@ -1075,7 +1075,17 @@ int smb_krb5_kt_add_entry_ext(krb5_context context,
krb5_data password,
bool no_salt,
bool keep_old_entries);
-
+krb5_error_code smb_krb5_get_credentials(krb5_context context,
+ krb5_ccache ccache,
+ krb5_principal me,
+ krb5_principal server,
+ krb5_principal impersonate_princ,
+ krb5_creds **out_creds);
+krb5_error_code smb_krb5_get_creds(const char *server_s,
+ time_t time_offset,
+ const char *cc,
+ const char *impersonate_princ_s,
+ krb5_creds **creds_p);
#endif /* HAVE_KRB5 */
diff --git a/source3/libsmb/clikrb5.c b/source3/libsmb/clikrb5.c
index 2f68abe961..1778853ca9 100644
--- a/source3/libsmb/clikrb5.c
+++ b/source3/libsmb/clikrb5.c
@@ -4,7 +4,7 @@
Copyright (C) Andrew Tridgell 2001
Copyright (C) Luke Howard 2002-2003
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
- Copyright (C) Guenther Deschner 2005-2007
+ Copyright (C) Guenther Deschner 2005-2009
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
@@ -1964,6 +1964,275 @@ krb5_error_code krb5_auth_con_set_req_cksumtype(
}
#endif
+#if defined(HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE) && \
+ defined(HAVE_KRB5_GET_CREDS_OPT_ALLOC) && \
+ defined(HAVE_KRB5_GET_CREDS)
+static krb5_error_code smb_krb5_get_credentials_for_user_opt(krb5_context context,
+ krb5_ccache ccache,
+ krb5_principal me,
+ krb5_principal server,
+ krb5_principal impersonate_princ,
+ krb5_creds **out_creds)
+{
+ krb5_error_code ret;
+ krb5_get_creds_opt opt;
+
+ ret = krb5_get_creds_opt_alloc(context, &opt);
+ if (ret) {
+ goto done;
+ }
+ krb5_get_creds_opt_add_options(context, opt, KRB5_GC_FORWARDABLE);
+
+ if (impersonate_princ) {
+ ret = krb5_get_creds_opt_set_impersonate(context, opt,
+ impersonate_princ);
+ if (ret) {
+ goto done;
+ }
+ }
+
+ ret = krb5_get_creds(context, opt, ccache, server, out_creds);
+ if (ret) {
+ goto done;
+ }
+
+ done:
+ if (opt) {
+ krb5_get_creds_opt_free(context, opt);
+ }
+ return ret;
+}
+#endif /* HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE */
+
+#ifdef HAVE_KRB5_GET_CREDENTIALS_FOR_USER
+static krb5_error_code smb_krb5_get_credentials_for_user(krb5_context context,
+ krb5_ccache ccache,
+ krb5_principal me,
+ krb5_principal server,
+ krb5_principal impersonate_princ,
+ krb5_creds **out_creds)
+{
+ krb5_error_code ret;
+ krb5_creds in_creds;
+
+#if !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER
+krb5_error_code KRB5_CALLCONV
+krb5_get_credentials_for_user(krb5_context context, krb5_flags options,
+ krb5_ccache ccache, krb5_creds *in_creds,
+ krb5_data *subject_cert,
+ krb5_creds **out_creds);
+#endif /* !HAVE_DECL_KRB5_GET_CREDENTIALS_FOR_USER */
+
+ ZERO_STRUCT(in_creds);
+
+ if (impersonate_princ) {
+
+ in_creds.server = me;
+ in_creds.client = impersonate_princ;
+
+ ret = krb5_get_credentials_for_user(context,
+ 0, /* krb5_flags options */
+ ccache,
+ &in_creds,
+ NULL, /* krb5_data *subject_cert */
+ out_creds);
+ } else {
+ in_creds.client = me;
+ in_creds.server = server;
+
+ ret = krb5_get_credentials(context, 0, ccache,
+ &in_creds, out_creds);
+ }
+
+ return ret;
+}
+#endif /* HAVE_KRB5_GET_CREDENTIALS_FOR_USER */
+
+/*
+ * smb_krb5_get_credentials
+ *
+ * @brief Get krb5 credentials for a server
+ *
+ * @param[in] context An initialized krb5_context
+ * @param[in] ccache An initialized krb5_ccache
+ * @param[in] me The krb5_principal of the caller
+ * @param[in] server The krb5_principal of the requested service
+ * @param[in] impersonate_princ The krb5_principal of a user to impersonate as (optional)
+ * @param[out] out_creds The returned krb5_creds structure
+ * @return krb5_error_code
+ *
+ */
+krb5_error_code smb_krb5_get_credentials(krb5_context context,
+ krb5_ccache ccache,
+ krb5_principal me,
+ krb5_principal server,
+ krb5_principal impersonate_princ,
+ krb5_creds **out_creds)
+{
+ krb5_error_code ret;
+ krb5_creds *creds = NULL;
+
+ *out_creds = NULL;
+
+ if (impersonate_princ) {
+#ifdef HAVE_KRB5_GET_CREDS_OPT_SET_IMPERSONATE /* Heimdal */
+ ret = smb_krb5_get_credentials_for_user_opt(context, ccache, me, server, impersonate_princ, &creds);
+#elif defined(HAVE_KRB5_GET_CREDENTIALS_FOR_USER) /* MIT */
+ ret = smb_krb5_get_credentials_for_user(context, ccache, me, server, impersonate_princ, &creds);
+#else
+ ret = ENOTSUP;
+#endif
+ } else {
+ krb5_creds in_creds;
+
+ ZERO_STRUCT(in_creds);
+
+ in_creds.client = me;
+ in_creds.server = server;
+
+ ret = krb5_get_credentials(context, 0, ccache,
+ &in_creds, &creds);
+ }
+ if (ret) {
+ goto done;
+ }
+
+ ret = krb5_cc_store_cred(context, ccache, creds);
+ if (ret) {
+ goto done;
+ }
+
+ if (out_creds) {
+ *out_creds = creds;
+ }
+
+ done:
+ if (creds && ret) {
+ krb5_free_creds(context, creds);
+ }
+
+ return ret;
+}
+
+/*
+ * smb_krb5_get_creds
+ *
+ * @brief Get krb5 credentials for a server
+ *
+ * @param[in] server_s The string name of the service
+ * @param[in] time_offset The offset to the KDCs time in seconds (optional)
+ * @param[in] cc The krb5 credential cache string name (optional)
+ * @param[in] impersonate_princ_s The string principal name to impersonate (optional)
+ * @param[out] creds_p The returned krb5_creds structure
+ * @return krb5_error_code
+ *
+ */
+krb5_error_code smb_krb5_get_creds(const char *server_s,
+ time_t time_offset,
+ const char *cc,
+ const char *impersonate_princ_s,
+ krb5_creds **creds_p)
+{
+ krb5_error_code ret;
+ krb5_context context = NULL;
+ krb5_principal me = NULL;
+ krb5_principal server = NULL;
+ krb5_principal impersonate_princ = NULL;
+ krb5_creds *creds = NULL;
+ krb5_ccache ccache = NULL;
+
+ *creds_p = NULL;
+
+ initialize_krb5_error_table();
+ ret = krb5_init_context(&context);
+ if (ret) {
+ goto done;
+ }
+
+ if (time_offset != 0) {
+ krb5_set_real_time(context, time(NULL) + time_offset, 0);
+ }
+
+ ret = krb5_cc_resolve(context, cc ? cc :
+ krb5_cc_default_name(context), &ccache);
+ if (ret) {
+ goto done;
+ }
+
+ ret = krb5_cc_get_principal(context, ccache, &me);
+ if (ret) {
+ goto done;
+ }
+
+ ret = smb_krb5_parse_name(context, server_s, &server);
+ if (ret) {
+ goto done;
+ }
+
+ if (impersonate_princ_s) {
+ ret = smb_krb5_parse_name(context, impersonate_princ_s,
+ &impersonate_princ);
+ if (ret) {
+ goto done;
+ }
+ }
+
+ ret = smb_krb5_get_credentials(context, ccache,
+ me, server, impersonate_princ,
+ &creds);
+ if (ret) {
+ goto done;
+ }
+
+ ret = krb5_cc_store_cred(context, ccache, creds);
+ if (ret) {
+ goto done;
+ }
+
+ if (creds_p) {
+ *creds_p = creds;
+ }
+
+ DEBUG(1,("smb_krb5_get_creds: got ticket for %s\n",
+ server_s));
+
+ if (impersonate_princ_s) {
+ char *client = NULL;
+
+ ret = smb_krb5_unparse_name(talloc_tos(), context, creds->client, &client);
+ if (ret) {
+ goto done;
+ }
+ DEBUGADD(1,("smb_krb5_get_creds: using S4U2SELF impersonation as %s\n",
+ client));
+ TALLOC_FREE(client);
+ }
+
+ done:
+ if (!context) {
+ return ret;
+ }
+
+ if (creds && ret) {
+ krb5_free_creds(context, creds);
+ }
+ if (server) {
+ krb5_free_principal(context, server);
+ }
+ if (me) {
+ krb5_free_principal(context, me);
+ }
+ if (impersonate_princ) {
+ krb5_free_principal(context, impersonate_princ);
+ }
+ if (ccache) {
+ krb5_cc_close(context, ccache);
+ }
+ krb5_free_context(context);
+
+ return ret;
+}
+
#else /* HAVE_KRB5 */
/* this saves a few linking headaches */
int cli_krb5_get_ticket(const char *principal, time_t time_offset,