krb5samba: Add smb_krb5_make_pac_checksum.

Signed-off-by: Simo Sorce <idra@samba.org>

Autobuild-User: Simo Sorce <idra@samba.org>
Autobuild-Date: Tue May  8 08:30:52 CEST 2012 on sn-devel-104

5 files changed, 86 insertions, 1 deletions

diff --git a/lib/krb5_wrap/krb5_samba.c b/lib/krb5_wrap/krb5_samba.c
index cbfaa9c9fb..16c690108f 100644
--- a/lib/krb5_wrap/krb5_samba.c
+++ b/lib/krb5_wrap/krb5_samba.c
@@ -2182,6 +2182,82 @@ void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum)
 }
 #endif
 
+krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
+					   DATA_BLOB *pac_data,
+					   krb5_context context,
+					   const krb5_keyblock *keyblock,
+					   uint32_t *sig_type,
+					   DATA_BLOB *sig_blob)
+{
+	krb5_error_code ret;
+	krb5_checksum cksum;
+#if defined(HAVE_KRB5_CRYPTO_INIT) && defined(HAVE_KRB5_CREATE_CHECKSUM)
+	krb5_crypto crypto;
+
+
+	ret = krb5_crypto_init(context,
+			       keyblock,
+			       0,
+			       &crypto);
+	if (ret) {
+		DEBUG(0,("krb5_crypto_init() failed: %s\n",
+			  smb_get_krb5_error_message(context, ret, mem_ctx)));
+		return ret;
+	}
+	ret = krb5_create_checksum(context,
+				   crypto,
+				   KRB5_KU_OTHER_CKSUM,
+				   0,
+				   pac_data->data,
+				   pac_data->length,
+				   &cksum);
+	if (ret) {
+		DEBUG(2, ("PAC Verification failed: %s\n",
+			  smb_get_krb5_error_message(context, ret, mem_ctx)));
+	}
+
+	krb5_crypto_destroy(context, crypto);
+
+	if (ret) {
+		return ret;
+	}
+
+	*sig_type = cksum.cksumtype;
+	*sig_blob = data_blob_talloc(mem_ctx,
+					cksum.checksum.data,
+					cksum.checksum.length);
+#elif defined(HAVE_KRB5_C_MAKE_CHECKSUM)
+	krb5_data input;
+
+	input.data = (char *)pac_data->data;
+	input.length = pac_data->length;
+
+	ret = krb5_c_make_checksum(context,
+				   0,
+				   keyblock,
+				   KRB5_KEYUSAGE_APP_DATA_CKSUM,
+				   &input,
+				   &cksum);
+	if (ret) {
+		DEBUG(2, ("PAC Verification failed: %s\n",
+			  smb_get_krb5_error_message(context, ret, mem_ctx)));
+		return ret;
+	}
+
+	*sig_type = cksum.checksum_type;
+	*sig_blob = data_blob_talloc(mem_ctx,
+					cksum.contents,
+					cksum.length);
+
+#else
+#error krb5_create_checksum or krb5_c_make_checksum not available
+#endif /* HAVE_KRB5_C_MAKE_CHECKSUM */
+	smb_krb5_free_checksum_contents(context, &cksum);
+
+	return 0;
+}
+
+
 /*
  * smb_krb5_principal_get_realm
  *
diff --git a/lib/krb5_wrap/krb5_samba.h b/lib/krb5_wrap/krb5_samba.h
index a164ea34a8..15da39c037 100644
--- a/lib/krb5_wrap/krb5_samba.h
+++ b/lib/krb5_wrap/krb5_samba.h
@@ -259,6 +259,13 @@ void smb_krb5_free_checksum_contents(krb5_context ctx, krb5_checksum *cksum);
 #error krb5_free_checksum_contents/free_Checksum is not vailable
 #endif
 
+krb5_error_code smb_krb5_make_pac_checksum(TALLOC_CTX *mem_ctx,
+					   DATA_BLOB *pac_data,
+					   krb5_context context,
+					   const krb5_keyblock *keyblock,
+					   uint32_t *sig_type,
+					   DATA_BLOB *sig_blob);
+
 char *smb_krb5_principal_get_realm(krb5_context context,
 				   krb5_principal principal);
 
diff --git a/source3/configure.in b/source3/configure.in
index 96c7b3ee57..c1564a5f8f 100644
--- a/source3/configure.in
+++ b/source3/configure.in
@@ -3619,6 +3619,7 @@ if test x"$with_ads_support" != x"no"; then
   AC_CHECK_FUNC_EXT(krb5_cc_get_lifetime, $KRB5_LIBS)
   AC_CHECK_FUNC_EXT(krb5_cc_retrieve_cred, $KRB5_LIBS)
   AC_CHECK_FUNC_EXT(krb5_free_checksum_contents, $KRB5_LIBS)
+  AC_CHECK_FUNC_EXT(krb5_c_make_checksum, $KRB5_LIBS)
   AC_CHECK_FUNC_EXT(gss_krb5_import_cred, $KRB5_LIBS)
   AC_CHECK_FUNC_EXT(gss_get_name_attribute, $KRB5_LIBS)
   AC_CHECK_FUNC_EXT(gsskrb5_extract_authz_data_from_sec_context, $KRB5_LIBS)
diff --git a/source4/heimdal_build/wscript_configure b/source4/heimdal_build/wscript_configure
index 6fac5fee6a..17b7361cad 100755
--- a/source4/heimdal_build/wscript_configure
+++ b/source4/heimdal_build/wscript_configure
@@ -99,6 +99,7 @@ conf.define('HAVE_INITIALIZE_KRB5_ERROR_TABLE', 1)
 conf.define('HAVE_KRB5_ADDRESSES', 1)
 conf.define('HAVE_KRB5_AUTH_CON_SETKEY', 1)
 conf.define('HAVE_KRB5_CC_GET_LIFETIME', 1)
+conf.define('HAVE_KRB5_CREATE_CHECKSUM', 1)
 conf.define('HAVE_KRB5_CRYPTO', 1)
 conf.define('HAVE_KRB5_CRYPTO_DESTROY', 1)
 conf.define('HAVE_KRB5_CRYPTO_INIT', 1)
diff --git a/wscript_configure_krb5 b/wscript_configure_krb5
index ae1ff75e47..abfd04a179 100644
--- a/wscript_configure_krb5
+++ b/wscript_configure_krb5
@@ -65,7 +65,7 @@ conf.CHECK_FUNCS('''
        krb5_get_init_creds_keyblock krb5_get_init_creds_keytab
        krb5_make_principal krb5_build_principal_alloc_va
        krb5_cc_get_lifetime krb5_cc_retrieve_cred
-       krb5_free_checksum_contents''',
+       krb5_free_checksum_contents krb5_c_make_checksum''',
      lib='krb5 k5crypto')
 conf.CHECK_DECLS('''krb5_get_credentials_for_user
                     krb5_auth_con_set_req_cksumtype''',