Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 245 insertions, 0 deletions

diff --git a/src/auth/mech.c b/src/auth/mech.c
new file mode 100644
index 0000000..477f27b
--- /dev/null
+++ b/src/auth/mech.c
@@ -0,0 +1,245 @@
+/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
+
+#include "auth-common.h"
+#include "ioloop.h"
+#include "mech.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "passdb.h"
+
+#include <ctype.h>
+
+static struct mech_module_list *mech_modules;
+
+void mech_register_module(const struct mech_module *module)
+{
+	struct mech_module_list *list;
+	i_assert(strcmp(module->mech_name, t_str_ucase(module->mech_name)) == 0);
+
+	list = i_new(struct mech_module_list, 1);
+	list->module = *module;
+
+	list->next = mech_modules;
+	mech_modules = list;
+}
+
+void mech_unregister_module(const struct mech_module *module)
+{
+	struct mech_module_list **pos, *list;
+
+	for (pos = &mech_modules; *pos != NULL; pos = &(*pos)->next) {
+		if (strcmp((*pos)->module.mech_name, module->mech_name) == 0) {
+			list = *pos;
+			*pos = (*pos)->next;
+			i_free(list);
+			break;
+		}
+	}
+}
+
+const struct mech_module *mech_module_find(const char *name)
+{
+	struct mech_module_list *list;
+	name = t_str_ucase(name);
+
+	for (list = mech_modules; list != NULL; list = list->next) {
+		if (strcmp(list->module.mech_name, name) == 0)
+			return &list->module;
+	}
+	return NULL;
+}
+
+void mech_generic_auth_initial(struct auth_request *request,
+			       const unsigned char *data, size_t data_size)
+{
+	if (data == NULL) {
+		auth_request_handler_reply_continue(request, uchar_empty_ptr, 0);
+	} else {
+		/* initial reply given, even if it was 0 bytes */
+		request->mech->auth_continue(request, data, data_size);
+	}
+}
+
+void mech_generic_auth_free(struct auth_request *request)
+{
+	pool_unref(&request->pool);
+}
+
+extern const struct mech_module mech_plain;
+extern const struct mech_module mech_login;
+extern const struct mech_module mech_apop;
+extern const struct mech_module mech_cram_md5;
+extern const struct mech_module mech_digest_md5;
+extern const struct mech_module mech_external;
+extern const struct mech_module mech_otp;
+extern const struct mech_module mech_scram_sha1;
+extern const struct mech_module mech_scram_sha256;
+extern const struct mech_module mech_anonymous;
+#ifdef HAVE_GSSAPI
+extern const struct mech_module mech_gssapi;
+#endif
+#ifdef HAVE_GSSAPI_SPNEGO
+extern const struct mech_module mech_gssapi_spnego;
+#endif
+extern const struct mech_module mech_winbind_ntlm;
+extern const struct mech_module mech_winbind_spnego;
+extern const struct mech_module mech_oauthbearer;
+extern const struct mech_module mech_xoauth2;
+
+static void mech_register_add(struct mechanisms_register *reg,
+			      const struct mech_module *mech)
+{
+	struct mech_module_list *list;
+
+	list = p_new(reg->pool, struct mech_module_list, 1);
+	list->module = *mech;
+
+	str_printfa(reg->handshake, "MECH\t%s", mech->mech_name);
+	if ((mech->flags & MECH_SEC_PRIVATE) != 0)
+		str_append(reg->handshake, "\tprivate");
+	if ((mech->flags & MECH_SEC_ANONYMOUS) != 0)
+		str_append(reg->handshake, "\tanonymous");
+	if ((mech->flags & MECH_SEC_PLAINTEXT) != 0)
+		str_append(reg->handshake, "\tplaintext");
+	if ((mech->flags & MECH_SEC_DICTIONARY) != 0)
+		str_append(reg->handshake, "\tdictionary");
+	if ((mech->flags & MECH_SEC_ACTIVE) != 0)
+		str_append(reg->handshake, "\tactive");
+	if ((mech->flags & MECH_SEC_FORWARD_SECRECY) != 0)
+		str_append(reg->handshake, "\tforward-secrecy");
+	if ((mech->flags & MECH_SEC_MUTUAL_AUTH) != 0)
+		str_append(reg->handshake, "\tmutual-auth");
+	str_append_c(reg->handshake, '\n');
+
+	list->next = reg->modules;
+	reg->modules = list;
+}
+
+static const char *mech_get_plugin_name(const char *name)
+{
+	string_t *str = t_str_new(32);
+
+	str_append(str, "mech_");
+	for (; *name != '\0'; name++) {
+		if (*name == '-')
+			str_append_c(str, '_');
+		else
+			str_append_c(str, i_tolower(*name));
+	}
+	return str_c(str);
+}
+
+struct mechanisms_register *
+mech_register_init(const struct auth_settings *set)
+{
+	struct mechanisms_register *reg;
+	const struct mech_module *mech;
+	const char *const *mechanisms;
+	pool_t pool;
+
+	pool = pool_alloconly_create("mechanisms register", 1024);
+	reg = p_new(pool, struct mechanisms_register, 1);
+	reg->pool = pool;
+	reg->set = set;
+	reg->handshake = str_new(pool, 512);
+
+	mechanisms = t_strsplit_spaces(set->mechanisms, " ");
+	for (; *mechanisms != NULL; mechanisms++) {
+		const char *name = t_str_ucase(*mechanisms);
+
+		if (strcmp(name, "ANONYMOUS") == 0) {
+			if (*set->anonymous_username == '\0') {
+				i_fatal("ANONYMOUS listed in mechanisms, "
+					"but anonymous_username not set");
+			}
+		}
+		mech = mech_module_find(name);
+		if (mech == NULL) {
+			/* maybe it's a plugin. try to load it. */
+			auth_module_load(mech_get_plugin_name(name));
+			mech = mech_module_find(name);
+		}
+		if (mech == NULL)
+			i_fatal("Unknown authentication mechanism '%s'", name);
+		mech_register_add(reg, mech);
+	}
+
+	if (reg->modules == NULL)
+		i_fatal("No authentication mechanisms configured");
+	return reg;
+}
+
+void mech_register_deinit(struct mechanisms_register **_reg)
+{
+	struct mechanisms_register *reg = *_reg;
+
+	*_reg = NULL;
+	pool_unref(&reg->pool);
+}
+
+const struct mech_module *
+mech_register_find(const struct mechanisms_register *reg, const char *name)
+{
+	const struct mech_module_list *list;
+	name = t_str_ucase(name);
+
+	for (list = reg->modules; list != NULL; list = list->next) {
+		if (strcmp(list->module.mech_name, name) == 0)
+			return &list->module;
+	}
+	return NULL;
+}
+
+void mech_init(const struct auth_settings *set)
+{
+	mech_register_module(&mech_plain);
+	mech_register_module(&mech_login);
+	mech_register_module(&mech_apop);
+	mech_register_module(&mech_cram_md5);
+	mech_register_module(&mech_digest_md5);
+	mech_register_module(&mech_external);
+	if (set->use_winbind) {
+		mech_register_module(&mech_winbind_ntlm);
+		mech_register_module(&mech_winbind_spnego);
+	} else {
+#if defined(HAVE_GSSAPI_SPNEGO) && defined(BUILTIN_GSSAPI)
+		mech_register_module(&mech_gssapi_spnego);
+#endif
+	}
+	mech_register_module(&mech_otp);
+	mech_register_module(&mech_scram_sha1);
+	mech_register_module(&mech_scram_sha256);
+	mech_register_module(&mech_anonymous);
+#ifdef BUILTIN_GSSAPI
+	mech_register_module(&mech_gssapi);
+#endif
+	mech_register_module(&mech_oauthbearer);
+	mech_register_module(&mech_xoauth2);
+}
+
+void mech_deinit(const struct auth_settings *set)
+{
+	mech_unregister_module(&mech_plain);
+	mech_unregister_module(&mech_login);
+	mech_unregister_module(&mech_apop);
+	mech_unregister_module(&mech_cram_md5);
+	mech_unregister_module(&mech_digest_md5);
+	mech_unregister_module(&mech_external);
+	if (set->use_winbind) {
+		mech_unregister_module(&mech_winbind_ntlm);
+		mech_unregister_module(&mech_winbind_spnego);
+	} else {
+#if defined(HAVE_GSSAPI_SPNEGO) && defined(BUILTIN_GSSAPI)
+		mech_unregister_module(&mech_gssapi_spnego);
+#endif
+	}
+	mech_unregister_module(&mech_otp);
+	mech_unregister_module(&mech_scram_sha1);
+	mech_unregister_module(&mech_scram_sha256);
+	mech_unregister_module(&mech_anonymous);
+#ifdef BUILTIN_GSSAPI
+	mech_unregister_module(&mech_gssapi);
+#endif
+	mech_unregister_module(&mech_oauthbearer);
+	mech_unregister_module(&mech_xoauth2);
+}