Implement PAM password verification in swaylock

4 files changed, 282 insertions, 0 deletions

diff --git a/CMake/FindPAM.cmake b/CMake/FindPAM.cmake
new file mode 100644
index 00000000..7e6e333a
--- /dev/null
+++ b/CMake/FindPAM.cmake
@@ -0,0 +1,245 @@
+# - Try to find the PAM libraries
+# Once done this will define
+#
+#  PAM_FOUND - system has pam
+#  PAM_INCLUDE_DIR - the pam include directory
+#  PAM_LIBRARIES - libpam library
+
+if (PAM_INCLUDE_DIR AND PAM_LIBRARY)
+	set(PAM_FIND_QUIETLY TRUE)
+endif (PAM_INCLUDE_DIR AND PAM_LIBRARY)
+
+find_path(PAM_INCLUDE_DIR NAMES security/pam_appl.h pam/pam_appl.h)
+find_library(PAM_LIBRARY pam)
+find_library(DL_LIBRARY dl)
+
+if (PAM_INCLUDE_DIR AND PAM_LIBRARY)
+	set(PAM_FOUND TRUE)
+	if (DL_LIBRARY)
+		set(PAM_LIBRARIES ${PAM_LIBRARY} ${DL_LIBRARY})
+	else (DL_LIBRARY)
+		set(PAM_LIBRARIES ${PAM_LIBRARY})
+	endif (DL_LIBRARY)
+
+	if (EXISTS ${PAM_INCLUDE_DIR}/pam/pam_appl.h)
+		set(HAVE_PAM_PAM_APPL_H 1)
+	endif (EXISTS ${PAM_INCLUDE_DIR}/pam/pam_appl.h)
+endif (PAM_INCLUDE_DIR AND PAM_LIBRARY)
+
+if (PAM_FOUND)
+	if (NOT PAM_FIND_QUIETLY)
+		message(STATUS "Found PAM: ${PAM_LIBRARIES}")
+	endif (NOT PAM_FIND_QUIETLY)
+else (PAM_FOUND)
+	if (PAM_FIND_REQUIRED)
+		message(FATAL_ERROR "PAM was not found")
+	endif(PAM_FIND_REQUIRED)
+endif (PAM_FOUND)
+
+mark_as_advanced(PAM_INCLUDE_DIR PAM_LIBRARY DL_LIBRARY)
+
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diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d7623b0..576b875d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -49,6 +49,7 @@ find_package(WLC REQUIRED)
 find_package(Wayland REQUIRED)
 find_package(XKBCommon REQUIRED)
 find_package(GdkPixbuf REQUIRED)
+find_package(PAM REQUIRED)
 
 include(Manpage)
 
diff --git a/swaylock/CMakeLists.txt b/swaylock/CMakeLists.txt
index 977cc2f7..306be80e 100644
--- a/swaylock/CMakeLists.txt
+++ b/swaylock/CMakeLists.txt
@@ -4,6 +4,7 @@ include_directories(
 	${CAIRO_INCLUDE_DIRS}
 	${GDK_PIXBUF_INCLUDE_DIRS}
 	${PANGO_INCLUDE_DIRS}
+	${PAM_INCLUDE_DIRS}
 )
 
 add_executable(swaylock
@@ -18,6 +19,7 @@ target_link_libraries(swaylock
 	${CAIRO_LIBRARIES}
 	${GDK_PIXBUF_LIBRARIES}
 	${PANGO_LIBRARIES}
+	${PAM_LIBRARIES}
 	m
 )
 
diff --git a/swaylock/main.c b/swaylock/main.c
index 95921d53..19993ce6 100644
--- a/swaylock/main.c
+++ b/swaylock/main.c
@@ -1,4 +1,5 @@
 #include "wayland-swaylock-client-protocol.h"
+#include <security/pam_appl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -29,6 +30,39 @@ void sway_terminate(void) {
 	exit(EXIT_FAILURE);
 }
 
+struct pam_response *pam_reply;
+
+int function_conversation(int num_msg, const struct pam_message **msg,
+		struct pam_response **resp, void *appdata_ptr) {  
+	*resp = pam_reply;
+	return PAM_SUCCESS;  
+}  
+
+/**
+ * password will be zeroed out.
+ */
+bool verify_password(const char *username, char *password) {
+	const struct pam_conv local_conversation = { function_conversation, NULL };
+	pam_handle_t *local_auth_handle = NULL;
+	int pam_err;
+	if ((pam_err = pam_start("swaylock", username, &local_conversation, &local_auth_handle)) != PAM_SUCCESS) {
+		sway_abort("PAM returned %d\n", pam_err);
+	}
+	pam_reply = (struct pam_response *)malloc(sizeof(struct pam_response));
+	pam_reply[0].resp = password;
+	pam_reply[0].resp_retcode = 0;
+	if ((pam_err = pam_authenticate(local_auth_handle, 0)) != PAM_SUCCESS) {
+		memset(password, 0, strlen(password));
+		return false;
+	}
+	if ((pam_err = pam_end(local_auth_handle, pam_err)) != PAM_SUCCESS) {
+		memset(password, 0, strlen(password));
+		return false;
+	}
+	memset(password, 0, strlen(password));
+	return true;
+}
+
 void notify_key(enum wl_keyboard_key_state state, xkb_keysym_t sym, uint32_t code, uint32_t codepoint) {
 	sway_log(L_INFO, "notified of key %c", (char)codepoint);
 }