am 63325c91: am d5fcafaf: adb: Add public key authentification (75e65e06) · Commits · e / os / android_system_core

adb/Android.mk

+16 −6

Original line number	Diff line number	Diff line
		@@ -17,32 +17,34 @@ ifeq ($(HOST_OS),linux)
		USB_SRCS := usb_linux.c
		EXTRA_SRCS := get_my_path_linux.c
		LOCAL_LDLIBS += -lrt -lncurses -lpthread
		LOCAL_SHARED_LIBRARIES := libcrypto
		endif

		ifeq ($(HOST_OS),darwin)
		USB_SRCS := usb_osx.c
		EXTRA_SRCS := get_my_path_darwin.c
		LOCAL_LDLIBS += -lpthread -framework CoreFoundation -framework IOKit -framework Carbon
		LOCAL_LDLIBS += -lpthread -lcrypto -framework CoreFoundation -framework IOKit -framework Carbon
		endif

		ifeq ($(HOST_OS),freebsd)
		USB_SRCS := usb_libusb.c
		EXTRA_SRCS := get_my_path_freebsd.c
		LOCAL_LDLIBS += -lpthread -lusb
		LOCAL_SHARED_LIBRARIES := libcrypto
		endif

		ifeq ($(HOST_OS),windows)
		USB_SRCS := usb_windows.c
		EXTRA_SRCS := get_my_path_windows.c
		EXTRA_STATIC_LIBS := AdbWinApi
		EXTRA_SRCS := get_my_path_windows.c ../libcutils/list.c
		EXTRA_STATIC_LIBS := AdbWinApi libcrypto_static
		ifneq ($(strip $(USE_CYGWIN)),)
		# Pure cygwin case
		LOCAL_LDLIBS += -lpthread
		LOCAL_LDLIBS += -lpthread -lgdi32
		LOCAL_C_INCLUDES += /usr/include/w32api/ddk
		endif
		ifneq ($(strip $(USE_MINGW)),)
		# MinGW under Linux case
		LOCAL_LDLIBS += -lws2_32
		LOCAL_LDLIBS += -lws2_32 -lgdi32
		USE_SYSDEPS_WIN32 := 1
		LOCAL_C_INCLUDES += /usr/i586-mingw32msvc/include/ddk
		endif
		@@ -57,6 +59,7 @@ LOCAL_SRC_FILES := \
		transport_usb.c \
		commandline.c \
		adb_client.c \
		adb_auth_host.c \
		sockets.c \
		services.c \
		file_sync_client.c \
		@@ -65,6 +68,7 @@ LOCAL_SRC_FILES := \
		utils.c \
		usb_vendors.c

		LOCAL_C_INCLUDES += external/openssl/include

		ifneq ($(USE_SYSDEPS_WIN32),)
		LOCAL_SRC_FILES += sysdeps_win32.c
		@@ -104,6 +108,7 @@ LOCAL_SRC_FILES := \
		transport.c \
		transport_local.c \
		transport_usb.c \
		adb_auth_client.c \
		sockets.c \
		services.c \
		file_sync_service.c \
		@@ -127,7 +132,7 @@ LOCAL_FORCE_STATIC_EXECUTABLE := true
		LOCAL_MODULE_PATH := $(TARGET_ROOT_OUT_SBIN)
		LOCAL_UNSTRIPPED_PATH := $(TARGET_ROOT_OUT_SBIN_UNSTRIPPED)

		LOCAL_STATIC_LIBRARIES := libcutils libc
		LOCAL_STATIC_LIBRARIES := libcutils libc libmincrypt
		include $(BUILD_EXECUTABLE)


		@@ -146,6 +151,7 @@ LOCAL_SRC_FILES := \
		transport_usb.c \
		commandline.c \
		adb_client.c \
		adb_auth_host.c \
		sockets.c \
		services.c \
		file_sync_client.c \
		@@ -165,9 +171,13 @@ LOCAL_CFLAGS := \
		-D_XOPEN_SOURCE \
		-D_GNU_SOURCE

		LOCAL_C_INCLUDES += external/openssl/include

		LOCAL_MODULE := adb

		LOCAL_STATIC_LIBRARIES := libzipfile libunz libcutils

		LOCAL_SHARED_LIBRARIES := libcrypto

		include $(BUILD_EXECUTABLE)
		endif

adb/adb.c

+114 −14

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@

		#include "sysdeps.h"
		#include "adb.h"
		#include "adb_auth.h"

		#define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))

		@@ -46,6 +47,8 @@ ADB_MUTEX_DEFINE( D_lock );

		int HOST = 0;

		static int auth_enabled = 0;

		#if !ADB_HOST
		static const char *adb_device_banner = "device";
		#endif
		@@ -100,6 +103,7 @@ void adb_trace_init(void)
		{ "transport", TRACE_TRANSPORT },
		{ "jdwp", TRACE_JDWP },
		{ "services", TRACE_SERVICES },
		{ "auth", TRACE_AUTH },
		{ NULL, 0 }
		};

		@@ -203,19 +207,21 @@ void put_apacket(apacket *p)
		free(p);
		}

		void handle_online(void)
		void handle_online(atransport *t)
		{
		D("adb: online\n");
		t->online = 1;
		}

		void handle_offline(atransport *t)
		{
		D("adb: offline\n");
		//Close the associated usb
		t->online = 0;
		run_transport_disconnects(t);
		}

		#if TRACE_PACKETS
		#if DEBUG_PACKETS
		#define DUMPMAX 32
		void print_packet(const char label, apacket p)
		{
		@@ -230,6 +236,7 @@ void print_packet(const char label, apacket p)
		case A_OKAY: tag = "OKAY"; break;
		case A_CLSE: tag = "CLSE"; break;
		case A_WRTE: tag = "WRTE"; break;
		case A_AUTH: tag = "AUTH"; break;
		default: tag = "????"; break;
		}

		@@ -251,7 +258,7 @@ void print_packet(const char label, apacket p)
		}
		x++;
		}
		fprintf(stderr, tag);
		fputs(tag, stderr);
		}
		#endif

		@@ -315,11 +322,70 @@ static void send_connect(atransport *t)
		cp->msg.data_length = fill_connect_data((char *)cp->data,
		sizeof(cp->data));
		send_packet(cp, t);
		#if ADB_HOST
		/* XXX why sleep here? */
		// allow the device some time to respond to the connect message
		adb_sleep_ms(1000);
		#endif
		}

		static void send_auth_request(atransport *t)
		{
		D("Calling send_auth_request\n");
		apacket *p;
		int ret;

		ret = adb_auth_generate_token(t->token, sizeof(t->token));
		if (ret != sizeof(t->token)) {
		D("Error generating token ret=%d\n", ret);
		return;
		}

		p = get_apacket();
		memcpy(p->data, t->token, ret);
		p->msg.command = A_AUTH;
		p->msg.arg0 = ADB_AUTH_TOKEN;
		p->msg.data_length = ret;
		send_packet(p, t);
		}

		static void send_auth_response(uint8_t token, size_t token_size, atransport t)
		{
		D("Calling send_auth_response\n");
		apacket *p = get_apacket();
		int ret;

		ret = adb_auth_sign(t->key, token, token_size, p->data);
		if (!ret) {
		D("Error signing the token\n");
		put_apacket(p);
		return;
		}

		p->msg.command = A_AUTH;
		p->msg.arg0 = ADB_AUTH_SIGNATURE;
		p->msg.data_length = ret;
		send_packet(p, t);
		}

		static void send_auth_publickey(atransport *t)
		{
		D("Calling send_auth_publickey\n");
		apacket *p = get_apacket();
		int ret;

		ret = adb_auth_get_userkey(p->data, sizeof(p->data));
		if (!ret) {
		D("Failed to get user public key\n");
		put_apacket(p);
		return;
		}

		p->msg.command = A_AUTH;
		p->msg.arg0 = ADB_AUTH_RSAPUBLICKEY;
		p->msg.data_length = ret;
		send_packet(p, t);
		}

		void adb_auth_verified(atransport *t)
		{
		handle_online(t);
		send_connect(t);
		}

		static char connection_state_name(atransport t)
		@@ -451,13 +517,42 @@ void handle_packet(apacket p, atransport t)
		t->connection_state = CS_OFFLINE;
		handle_offline(t);
		}

		parse_banner((char*) p->data, t);
		handle_online();

		if (HOST \|\| !auth_enabled) {
		handle_online(t);
		if(!HOST) send_connect(t);
		} else {
		send_auth_request(t);
		}
		break;

		case A_AUTH:
		if (p->msg.arg0 == ADB_AUTH_TOKEN) {
		t->key = adb_auth_nextkey(t->key);
		if (t->key) {
		send_auth_response(p->data, p->msg.data_length, t);
		} else {
		/* No more private keys to try, send the public key */
		send_auth_publickey(t);
		}
		} else if (p->msg.arg0 == ADB_AUTH_SIGNATURE) {
		if (adb_auth_verify(t->token, p->data, p->msg.data_length)) {
		adb_auth_verified(t);
		t->failed_auth_attempts = 0;
		} else {
		if (t->failed_auth_attempts++ > 10)
		adb_sleep_ms(1000);
		send_auth_request(t);
		}
		} else if (p->msg.arg0 == ADB_AUTH_RSAPUBLICKEY) {
		adb_auth_confirm_key(p->data, p->msg.data_length, t);
		}
		break;

		case A_OPEN: /* OPEN(local-id, 0, "destination") */
		if(t->connection_state != CS_OFFLINE) {
		if (t->online) {
		char name = (char) p->data;
		name[p->msg.data_length > 0 ? p->msg.data_length - 1 : 0] = 0;
		s = create_local_service_socket(name);
		@@ -473,7 +568,7 @@ void handle_packet(apacket p, atransport t)
		break;

		case A_OKAY: /* READY(local-id, remote-id, "") */
		if(t->connection_state != CS_OFFLINE) {
		if (t->online) {
		if((s = find_local_socket(p->msg.arg1))) {
		if(s->peer == 0) {
		s->peer = create_remote_socket(p->msg.arg0, t);
		@@ -485,7 +580,7 @@ void handle_packet(apacket p, atransport t)
		break;

		case A_CLSE: /* CLOSE(local-id, remote-id, "") */
		if(t->connection_state != CS_OFFLINE) {
		if (t->online) {
		if((s = find_local_socket(p->msg.arg1))) {
		s->close(s);
		}
		@@ -493,7 +588,7 @@ void handle_packet(apacket p, atransport t)
		break;

		case A_WRTE:
		if(t->connection_state != CS_OFFLINE) {
		if (t->online) {
		if((s = find_local_socket(p->msg.arg1))) {
		unsigned rid = p->msg.arg0;
		p->len = p->msg.data_length;
		@@ -1014,6 +1109,7 @@ int adb_main(int is_daemon, int server_port)
		usb_vendors_init();
		usb_init();
		local_init(DEFAULT_ADB_LOCAL_TRANSPORT_PORT);
		adb_auth_init();

		char local_name[30];
		build_local_name(local_name, sizeof(local_name), server_port);
		@@ -1021,6 +1117,10 @@ int adb_main(int is_daemon, int server_port)
		exit(1);
		}
		#else
		property_get("ro.adb.secure", value, "0");
		auth_enabled = !strcmp(value, "1");
		if (auth_enabled)
		adb_auth_init();

		/* don't listen on a port (default 5037) if running in secure mode */
		/* don't run as root if we are running in secure mode */

adb/adb.h

+12 −2

Original line number	Diff line number	Diff line
		@@ -29,13 +29,14 @@
		#define A_OKAY 0x59414b4f
		#define A_CLSE 0x45534c43
		#define A_WRTE 0x45545257
		#define A_AUTH 0x48545541

		#define A_VERSION 0x01000000 // ADB protocol version

		#define ADB_VERSION_MAJOR 1 // Used for help/version information
		#define ADB_VERSION_MINOR 0 // Used for help/version information

		#define ADB_SERVER_VERSION 29 // Increment this when we want to force users to start a new adb server
		#define ADB_SERVER_VERSION 30 // Increment this when we want to force users to start a new adb server

		typedef struct amessage amessage;
		typedef struct apacket apacket;
		@@ -165,6 +166,8 @@ typedef enum transport_type {
		kTransportHost,
		} transport_type;

		#define TOKEN_SIZE 20

		struct atransport
		{
		atransport *next;
		@@ -181,6 +184,7 @@ struct atransport
		int ref_count;
		unsigned sync_token;
		int connection_state;
		int online;
		transport_type type;

		/* usb handle or socket fd as needed */
		@@ -198,6 +202,11 @@ struct atransport
		/* a list of adisconnect callbacks called when the transport is kicked */
		int kicked;
		adisconnect disconnects;

		void *key;
		unsigned char token[TOKEN_SIZE];
		fdevent auth_fde;
		unsigned failed_auth_attempts;
		};


		@@ -349,6 +358,7 @@ typedef enum {
		TRACE_SYSDEPS,
		TRACE_JDWP, /* 0x100 */
		TRACE_SERVICES,
		TRACE_AUTH,
		} AdbTrace;

		#if ADB_TRACE
		@@ -408,7 +418,7 @@ void adb_qemu_trace(const char* fmt, ...);
		#endif


		#if !TRACE_PACKETS
		#if !DEBUG_PACKETS
		#define print_packet(tag,p) do {} while (0)
		#endif

adb/adb_auth.h

0 → 100644

+54 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2012 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#ifndef __ADB_AUTH_H
		#define __ADB_AUTH_H

		void adb_auth_init(void);
		void adb_auth_verified(atransport *t);

		/* AUTH packets first argument */
		/* Request */
		#define ADB_AUTH_TOKEN 1
		/* Response */
		#define ADB_AUTH_SIGNATURE 2
		#define ADB_AUTH_RSAPUBLICKEY 3

		#if ADB_HOST

		int adb_auth_sign(void key, void token, size_t token_size, void *sig);
		void adb_auth_nextkey(void current);
		int adb_auth_get_userkey(unsigned char *data, size_t len);

		static inline int adb_auth_generate_token(void *token, size_t token_size) { return 0; }
		static inline int adb_auth_verify(void token, void sig, int siglen) { return 0; }
		static inline void adb_auth_confirm_key(unsigned char data, size_t len, atransport t) { }
		static inline void adb_auth_reload_keys(void) { }

		#else // !ADB_HOST

		static inline int adb_auth_sign(void* key, void token, size_t token_size, void sig) { return 0; }
		static inline void adb_auth_nextkey(void current) { return NULL; }
		static inline int adb_auth_get_userkey(unsigned char *data, size_t len) { return 0; }

		int adb_auth_generate_token(void *token, size_t token_size);
		int adb_auth_verify(void token, void sig, int siglen);
		void adb_auth_confirm_key(unsigned char data, size_t len, atransport t);
		void adb_auth_reload_keys(void);

		#endif // ADB_HOST

		#endif // __ADB_AUTH_H

adb/adb_auth_client.c

0 → 100644

+245 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2012 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#include <stdio.h>
		#include <string.h>
		#include <resolv.h>
		#include <cutils/list.h>
		#include <cutils/sockets.h>

		#include "sysdeps.h"
		#include "adb.h"
		#include "adb_auth.h"
		#include "fdevent.h"
		#include "mincrypt/rsa.h"

		#define TRACE_TAG TRACE_AUTH


		struct adb_public_key {
		struct listnode node;
		RSAPublicKey key;
		};

		static struct listnode key_list;

		static char *key_paths[] = {
		"/adb_keys",
		"/data/misc/adb/adb_keys",
		NULL
		};

		static fdevent listener_fde;
		static int framework_fd = -1;


		static void read_keys(const char file, struct listnode list)
		{
		struct adb_public_key *key;
		FILE *f;
		char buf[MAX_PAYLOAD];
		char *sep;
		int ret;

		f = fopen(file, "r");
		if (!f) {
		D("Can't open '%s'\n", file);
		return;
		}

		while (fgets(buf, sizeof(buf), f)) {
		/* Allocate 4 extra bytes to decode the base64 data in-place */
		key = calloc(1, sizeof(*key) + 4);
		if (!key) {
		D("Can't malloc key\n");
		break;
		}

		sep = strpbrk(buf, " \t");
		if (sep)
		*sep = '\0';

		ret = __b64_pton(buf, (u_char *)&key->key, sizeof(key->key) + 4);
		if (ret != sizeof(key->key)) {
		D("%s: Invalid base64 data ret=%d\n", file, ret);
		free(key);
		continue;
		}

		if (key->key.len != RSANUMWORDS) {
		D("%s: Invalid key len %d\n", file, key->key.len);
		free(key);
		continue;
		}

		list_add_tail(list, &key->node);
		}

		fclose(f);
		}

		static void free_keys(struct listnode *list)
		{
		struct listnode *item;

		while (!list_empty(list)) {
		item = list_head(list);
		list_remove(item);
		free(node_to_item(item, struct adb_public_key, node));
		}
		}

		void adb_auth_reload_keys(void)
		{
		char *path;
		char **paths = key_paths;
		struct stat buf;

		free_keys(&key_list);

		while ((path = *paths++)) {
		if (!stat(path, &buf)) {
		D("Loading keys from '%s'\n", path);
		read_keys(path, &key_list);
		}
		}
		}

		int adb_auth_generate_token(void *token, size_t token_size)
		{
		FILE *f;
		int ret;

		f = fopen("/dev/urandom", "r");
		if (!f)
		return 0;

		ret = fread(token, token_size, 1, f);

		fclose(f);
		return ret * token_size;
		}

		int adb_auth_verify(void token, void sig, int siglen)
		{
		struct listnode *item;
		struct adb_public_key *key;
		int ret;

		if (siglen != RSANUMBYTES)
		return 0;

		list_for_each(item, &key_list) {
		key = node_to_item(item, struct adb_public_key, node);
		ret = RSA_verify(&key->key, sig, siglen, token);
		if (ret)
		return 1;
		}

		return 0;
		}

		static void adb_auth_event(int fd, unsigned events, void *data)
		{
		atransport *t = data;
		char response[2];
		int ret;

		if (events & FDE_READ) {
		ret = unix_read(fd, response, sizeof(response));
		if (ret < 0) {
		D("Disconnect");
		fdevent_remove(&t->auth_fde);
		framework_fd = -1;
		}
		else if (ret == 2 && response[0] == 'O' && response[1] == 'K') {
		adb_auth_reload_keys();
		adb_auth_verified(t);
		}
		}
		}

		void adb_auth_confirm_key(unsigned char key, size_t len, atransport t)
		{
		char msg[MAX_PAYLOAD];
		int ret;

		if (framework_fd < 0) {
		D("Client not connected\n");
		return;
		}

		if (key[len - 1] != '\0') {
		D("Key must be a null-terminated string\n");
		return;
		}

		ret = snprintf(msg, sizeof(msg), "PK%s", key);
		if (ret >= (signed)sizeof(msg)) {
		D("Key too long. ret=%d", ret);
		return;
		}
		D("Sending '%s'\n", msg);

		ret = unix_write(framework_fd, msg, ret);
		if (ret < 0) {
		D("Failed to write PK, errno=%d\n", errno);
		return;
		}

		fdevent_install(&t->auth_fde, framework_fd, adb_auth_event, t);
		fdevent_add(&t->auth_fde, FDE_READ);
		}

		static void adb_auth_listener(int fd, unsigned events, void *data)
		{
		struct sockaddr addr;
		socklen_t alen;
		int s;

		alen = sizeof(addr);

		s = adb_socket_accept(fd, &addr, &alen);
		if (s < 0) {
		D("Failed to accept: errno=%d\n", errno);
		return;
		}

		framework_fd = s;
		}

		void adb_auth_init(void)
		{
		int fd, ret;

		list_init(&key_list);
		adb_auth_reload_keys();

		fd = android_get_control_socket("adbd");
		if (fd < 0) {
		D("Failed to get adbd socket\n");
		return;
		}

		ret = listen(fd, 4);
		if (ret < 0) {
		D("Failed to listen on '%d'\n", fd);
		return;
		}

		fdevent_install(&listener_fde, fd, adb_auth_listener, NULL);
		fdevent_add(&listener_fde, FDE_READ);
		}