Move adb to C++.

I keep trying to clean things up and needing std::strings. Might as
well just do this now.

usb_linux_client.c is going to stay as C because GCC isn't smart
enough to deal with the designated initializers it uses (though for
some reason it is in C mode).

The Darwin files are staying as C because I don't have a way to test
that they build.

The Windows files are staying as C because while I can actually build
for them, it's slow and painful.

Change-Id: I75367d29205a9049d34460032b3bb36384f43941

1 files changed, 271 insertions, 0 deletions

diff --git a/adb/adb_auth_client.cpp b/adb/adb_auth_client.cpp
new file mode 100644
index 0000000..deb0a5d
--- /dev/null
+++ b/adb/adb_auth_client.cpp
@@ -0,0 +1,271 @@
+/*
+ * 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 <resolv.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "sysdeps.h"
+
+#include "adb.h"
+#include "adb_auth.h"
+#include "cutils/list.h"
+#include "cutils/sockets.h"
+#include "fdevent.h"
+#include "mincrypt/rsa.h"
+#include "mincrypt/sha.h"
+#include "transport.h"
+
+#define TRACE_TAG TRACE_AUTH
+
+
+struct adb_public_key {
+    struct listnode node;
+    RSAPublicKey key;
+};
+
+static const char *key_paths[] = {
+    "/adb_keys",
+    "/data/misc/adb/adb_keys",
+    NULL
+};
+
+static fdevent listener_fde;
+static int framework_fd = -1;
+
+static void usb_disconnected(void* unused, atransport* t);
+static struct adisconnect usb_disconnect = { usb_disconnected, 0, 0, 0 };
+static atransport* usb_transport;
+static bool needs_retry = false;
+
+static void read_keys(const char *file, struct listnode *list)
+{
+    FILE *f;
+    char buf[MAX_PAYLOAD];
+    char *sep;
+    int ret;
+
+    f = fopen(file, "re");
+    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 */
+        auto key = reinterpret_cast<adb_public_key*>(
+            calloc(1, sizeof(adb_public_key) + 4));
+        if (key == nullptr) {
+            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));
+    }
+}
+
+static void load_keys(struct listnode *list)
+{
+    const char* path;
+    const char** paths = key_paths;
+    struct stat buf;
+
+    list_init(list);
+
+    while ((path = *paths++)) {
+        if (!stat(path, &buf)) {
+            D("Loading keys from '%s'\n", path);
+            read_keys(path, list);
+        }
+    }
+}
+
+int adb_auth_generate_token(void *token, size_t token_size)
+{
+    FILE *f;
+    int ret;
+
+    f = fopen("/dev/urandom", "re");
+    if (!f)
+        return 0;
+
+    ret = fread(token, token_size, 1, f);
+
+    fclose(f);
+    return ret * token_size;
+}
+
+int adb_auth_verify(uint8_t* token, uint8_t* sig, int siglen)
+{
+    struct listnode *item;
+    struct listnode key_list;
+    int ret = 0;
+
+    if (siglen != RSANUMBYTES)
+        return 0;
+
+    load_keys(&key_list);
+
+    list_for_each(item, &key_list) {
+        adb_public_key* key = node_to_item(item, struct adb_public_key, node);
+        ret = RSA_verify(&key->key, sig, siglen, token, SHA_DIGEST_SIZE);
+        if (ret)
+            break;
+    }
+
+    free_keys(&key_list);
+
+    return ret;
+}
+
+static void usb_disconnected(void* unused, atransport* t)
+{
+    D("USB disconnect\n");
+    remove_transport_disconnect(usb_transport, &usb_disconnect);
+    usb_transport = NULL;
+    needs_retry = false;
+}
+
+static void adb_auth_event(int fd, unsigned events, void *data)
+{
+    char response[2];
+    int ret;
+
+    if (events & FDE_READ) {
+        ret = unix_read(fd, response, sizeof(response));
+        if (ret <= 0) {
+            D("Framework disconnect\n");
+            if (usb_transport)
+                fdevent_remove(&usb_transport->auth_fde);
+            framework_fd = -1;
+        }
+        else if (ret == 2 && response[0] == 'O' && response[1] == 'K') {
+            if (usb_transport)
+                adb_auth_verified(usb_transport);
+        }
+    }
+}
+
+void adb_auth_confirm_key(unsigned char *key, size_t len, atransport *t)
+{
+    char msg[MAX_PAYLOAD];
+    int ret;
+
+    if (!usb_transport) {
+        usb_transport = t;
+        add_transport_disconnect(t, &usb_disconnect);
+    }
+
+    if (framework_fd < 0) {
+        D("Client not connected\n");
+        needs_retry = true;
+        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;
+
+    if (needs_retry) {
+        needs_retry = false;
+        send_auth_request(usb_transport);
+    }
+}
+
+void adb_auth_init(void)
+{
+    int fd, ret;
+
+    fd = android_get_control_socket("adbd");
+    if (fd < 0) {
+        D("Failed to get adbd socket\n");
+        return;
+    }
+    fcntl(fd, F_SETFD, FD_CLOEXEC);
+
+    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);
+}