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From 7417505e1d93cc95ec648b74e3c801bc67aacb9f Mon Sep 17 00:00:00 2001
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From: Jakub Filak <jfilak@redhat.com>
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Date: Thu, 7 May 2015 11:07:12 +0200
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Subject: [ABRT PATCH] daemon, dbus: allow only root to create CCpp, Koops,
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 vmcore and xorg
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Florian Weimer <fweimer@redhat.com>:
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    This prevents users from feeding things that are not actually
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    coredumps and excerpts from /proc to these analyzers.
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    For example, it should not be possible to trigger a rule with
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    “EVENT=post-create analyzer=CCpp” using NewProblem
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Related: #1212861
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Signed-off-by: Jakub Filak <jfilak@redhat.com>
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---
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 src/daemon/abrt-server.c |  2 +-
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 src/dbus/abrt-dbus.c     | 10 +++++++++-
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 src/include/libabrt.h    |  2 ++
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 src/lib/hooklib.c        | 24 ++++++++++++++++++++++++
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 4 files changed, 36 insertions(+), 2 deletions(-)
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diff --git a/src/daemon/abrt-server.c b/src/daemon/abrt-server.c
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index d3fa1b5..afd9fd3 100644
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--- a/src/daemon/abrt-server.c
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+++ b/src/daemon/abrt-server.c
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@@ -487,7 +487,7 @@ static gboolean key_value_ok(gchar *key, gchar *value)
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         }
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     }
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-    return TRUE;
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+    return allowed_new_user_problem_entry(client_uid, key, value);
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 }
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 /* Handles a message received from client over socket. */
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diff --git a/src/dbus/abrt-dbus.c b/src/dbus/abrt-dbus.c
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index 6de15e9..bef95bd 100644
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--- a/src/dbus/abrt-dbus.c
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+++ b/src/dbus/abrt-dbus.c
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@@ -168,6 +168,7 @@ bool allowed_problem_dir(const char *dir_name)
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 static char *handle_new_problem(GVariant *problem_info, uid_t caller_uid, char **error)
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 {
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+    char *problem_id = NULL;
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     problem_data_t *pd = problem_data_new();
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     GVariantIter *iter;
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@@ -175,6 +176,12 @@ static char *handle_new_problem(GVariant *problem_info, uid_t caller_uid, char *
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     gchar *key, *value;
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     while (g_variant_iter_loop(iter, "{ss}", &key, &value))
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     {
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+        if (allowed_new_user_problem_entry(caller_uid, key, value) == false)
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+        {
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+            *error = xasprintf("You are not allowed to create element '%s' containing '%s'", key, value);
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+            goto finito;
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+        }
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+
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         problem_data_add_text_editable(pd, key, value);
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     }
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@@ -189,12 +196,13 @@ static char *handle_new_problem(GVariant *problem_info, uid_t caller_uid, char *
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     /* At least it should generate local problem identifier UUID */
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     problem_data_add_basics(pd);
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-    char *problem_id = problem_data_save(pd);
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+    problem_id = problem_data_save(pd);
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     if (problem_id)
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         notify_new_path(problem_id);
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     else if (error)
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         *error = xasprintf("Cannot create a new problem");
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+finito:
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     problem_data_free(pd);
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     return problem_id;
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 }
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diff --git a/src/include/libabrt.h b/src/include/libabrt.h
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index 5bf2397..3749a31 100644
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--- a/src/include/libabrt.h
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+++ b/src/include/libabrt.h
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@@ -51,6 +51,8 @@ char *get_backtrace(const char *dump_dir_name, unsigned timeout_sec, const char
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 bool dir_is_in_dump_location(const char *dir_name);
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 #define dir_has_correct_permissions abrt_dir_has_correct_permissions
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 bool dir_has_correct_permissions(const char *dir_name);
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+#define allowed_new_user_problem_entry abrt_allowed_new_user_problem_entry
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+bool allowed_new_user_problem_entry(uid_t uid, const char *name, const char *value);
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 #define g_settings_nMaxCrashReportsSize abrt_g_settings_nMaxCrashReportsSize
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 extern unsigned int  g_settings_nMaxCrashReportsSize;
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diff --git a/src/lib/hooklib.c b/src/lib/hooklib.c
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index 4b20025..8e93663 100644
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--- a/src/lib/hooklib.c
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+++ b/src/lib/hooklib.c
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@@ -483,3 +483,27 @@ bool dir_has_correct_permissions(const char *dir_name)
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     }
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     return true;
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 }
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+
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+bool allowed_new_user_problem_entry(uid_t uid, const char *name, const char *value)
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+{
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+    /* Allow root to create everything */
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+    if (uid == 0)
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+        return true;
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+
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+    /* Permit non-root users to create everything except: analyzer and type */
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+    if (strcmp(name, FILENAME_ANALYZER) != 0
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+     && strcmp(name, FILENAME_TYPE) != 0
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+     /* compatibility value used in abrt-server */
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+     && strcmp(name, "basename") != 0)
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+        return true;
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+
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+    /* Permit non-root users to create all types except: C/C++, Koops, vmcore and xorg */
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+     if (strcmp(value, "CCpp") != 0
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+      && strcmp(value, "Kerneloops") != 0
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+      && strcmp(value, "vmcore") != 0
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+      && strcmp(value, "xorg") != 0)
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+        return true;
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+
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+    error_msg("Only root is permitted to create element '%s' containing '%s'", name, value);
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+    return false;
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+}
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-- 
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1.8.3.1
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