1 files changed, 130 insertions, 0 deletions
diff --git a/logd/LogCommand.cpp b/logd/LogCommand.cpp
new file mode 100644
index 0000000..e4c138e
--- /dev/null
+++ b/logd/LogCommand.cpp
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2012-2014 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 <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <private/android_filesystem_config.h>
+
+#include "LogCommand.h"
+
+LogCommand::LogCommand(const char *cmd)
+        : FrameworkCommand(cmd) {
+}
+
+// gets a list of supplementary group IDs associated with
+// the socket peer.  This is implemented by opening
+// /proc/PID/status and look for the "Group:" line.
+//
+// This function introduces races especially since status
+// can change 'shape' while reading, the net result is err
+// on lack of permission.
+//
+// Race-free alternative is to introduce pairs of sockets
+// and threads for each command and reading, one each that
+// has open permissions, and one that has restricted
+// permissions.
+
+static bool groupIsLog(char *buf) {
+    char *ptr;
+    static const char ws[] = " \n";
+    bool ret = false;
+
+    for (buf = strtok_r(buf, ws, &ptr); buf; buf = strtok_r(NULL, ws, &ptr)) {
+        errno = 0;
+        gid_t Gid = strtol(buf, NULL, 10);
+        if (errno != 0) {
+            return false;
+        }
+        if (Gid == AID_LOG) {
+            ret = true;
+        }
+    }
+    return ret;
+}
+
+bool clientHasLogCredentials(SocketClient * cli) {
+    uid_t uid = cli->getUid();
+    if (uid == AID_ROOT) {
+        return true;
+    }
+
+    gid_t gid = cli->getGid();
+    if ((gid == AID_ROOT) || (gid == AID_SYSTEM) || (gid == AID_LOG)) {
+        return true;
+    }
+
+    // FYI We will typically be here for 'adb logcat'
+    bool ret = false;
+
+    char filename[1024];
+    snprintf(filename, sizeof(filename), "/proc/%d/status", cli->getPid());
+
+    FILE *file = fopen(filename, "r");
+    if (!file) {
+        return ret;
+    }
+
+    bool foundGid = false;
+    bool foundUid = false;
+
+    char line[1024];
+    while (fgets(line, sizeof(line), file)) {
+        static const char groups_string[] = "Groups:\t";
+        static const char uid_string[] = "Uid:\t";
+        static const char gid_string[] = "Gid:\t";
+
+        if (strncmp(groups_string, line, strlen(groups_string)) == 0) {
+            ret = groupIsLog(line + strlen(groups_string));
+            if (!ret) {
+                break;
+            }
+        } else if (strncmp(uid_string, line, strlen(uid_string)) == 0) {
+            uid_t u[4] = { (uid_t) -1, (uid_t) -1, (uid_t) -1, (uid_t) -1};
+
+            sscanf(line + strlen(uid_string), "%u\t%u\t%u\t%u",
+                   &u[0], &u[1], &u[2], &u[3]);
+
+            // Protect against PID reuse by checking that the UID is the same
+            if ((uid != u[0]) || (uid != u[1]) || (uid != u[2]) || (uid != u[3])) {
+                ret = false;
+                break;
+            }
+            foundUid = true;
+        } else if (strncmp(gid_string, line, strlen(gid_string)) == 0) {
+            gid_t g[4] = { (gid_t) -1, (gid_t) -1, (gid_t) -1, (gid_t) -1};
+
+            sscanf(line + strlen(gid_string), "%u\t%u\t%u\t%u",
+                   &g[0], &g[1], &g[2], &g[3]);
+
+            // Protect against PID reuse by checking that the GID is the same
+            if ((gid != g[0]) || (gid != g[1]) || (gid != g[2]) || (gid != g[3])) {
+                ret = false;
+                break;
+            }
+            foundGid = true;
+        }
+    }
+
+    fclose(file);
+
+    if (!foundGid || !foundUid) {
+        ret = false;
+    }
+
+    return ret;
+}