diff options
Diffstat (limited to 'sys-auth/polkit/files/CVE-2018-19788.patch')
| -rw-r--r-- | sys-auth/polkit/files/CVE-2018-19788.patch | 339 |
1 files changed, 339 insertions, 0 deletions
diff --git a/sys-auth/polkit/files/CVE-2018-19788.patch b/sys-auth/polkit/files/CVE-2018-19788.patch new file mode 100644 index 000000000000..97e3608a12ba --- /dev/null +++ b/sys-auth/polkit/files/CVE-2018-19788.patch @@ -0,0 +1,339 @@ +From 2cb40c4d5feeaa09325522bd7d97910f1b59e379 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl> +Date: Mon, 3 Dec 2018 10:28:58 +0100 +Subject: [PATCH 1/2] Allow negative uids/gids in PolkitUnixUser and Group + objects + +(uid_t) -1 is still used as placeholder to mean "unset". This is OK, since +there should be no users with such number, see +https://systemd.io/UIDS-GIDS#special-linux-uids. + +(uid_t) -1 is used as the default value in class initialization. + +When a user or group above INT32_MAX is created, the numeric uid or +gid wraps around to negative when the value is assigned to gint, and +polkit gets confused. Let's accept such gids, except for -1. + +A nicer fix would be to change the underlying type to e.g. uint32 to +not have negative values. But this cannot be done without breaking the +API, so likely new functions will have to be added (a +polkit_unix_user_new variant that takes a unsigned, and the same for +_group_new, _set_uid, _get_uid, _set_gid, _get_gid, etc.). This will +require a bigger patch. + +Fixes https://gitlab.freedesktop.org/polkit/polkit/issues/74. +--- + src/polkit/polkitunixgroup.c | 15 +++++++++++---- + src/polkit/polkitunixprocess.c | 12 ++++++++---- + src/polkit/polkitunixuser.c | 13 ++++++++++--- + 3 files changed, 29 insertions(+), 11 deletions(-) + +diff --git a/src/polkit/polkitunixgroup.c b/src/polkit/polkitunixgroup.c +index c57a1aa..309f689 100644 +--- a/src/polkit/polkitunixgroup.c ++++ b/src/polkit/polkitunixgroup.c +@@ -71,6 +71,7 @@ G_DEFINE_TYPE_WITH_CODE (PolkitUnixGroup, polkit_unix_group, G_TYPE_OBJECT, + static void + polkit_unix_group_init (PolkitUnixGroup *unix_group) + { ++ unix_group->gid = -1; /* (git_t) -1 is not a valid GID under Linux */ + } + + static void +@@ -100,11 +101,14 @@ polkit_unix_group_set_property (GObject *object, + GParamSpec *pspec) + { + PolkitUnixGroup *unix_group = POLKIT_UNIX_GROUP (object); ++ gint val; + + switch (prop_id) + { + case PROP_GID: +- unix_group->gid = g_value_get_int (value); ++ val = g_value_get_int (value); ++ g_return_if_fail (val != -1); ++ unix_group->gid = val; + break; + + default: +@@ -131,9 +135,9 @@ polkit_unix_group_class_init (PolkitUnixGroupClass *klass) + g_param_spec_int ("gid", + "Group ID", + "The UNIX group ID", +- 0, ++ G_MININT, + G_MAXINT, +- 0, ++ -1, + G_PARAM_CONSTRUCT | + G_PARAM_READWRITE | + G_PARAM_STATIC_NAME | +@@ -166,9 +170,10 @@ polkit_unix_group_get_gid (PolkitUnixGroup *group) + */ + void + polkit_unix_group_set_gid (PolkitUnixGroup *group, +- gint gid) ++ gint gid) + { + g_return_if_fail (POLKIT_IS_UNIX_GROUP (group)); ++ g_return_if_fail (gid != -1); + group->gid = gid; + } + +@@ -183,6 +188,8 @@ polkit_unix_group_set_gid (PolkitUnixGroup *group, + PolkitIdentity * + polkit_unix_group_new (gint gid) + { ++ g_return_val_if_fail (gid != -1, NULL); ++ + return POLKIT_IDENTITY (g_object_new (POLKIT_TYPE_UNIX_GROUP, + "gid", gid, + NULL)); +diff --git a/src/polkit/polkitunixprocess.c b/src/polkit/polkitunixprocess.c +index 972b777..b02b258 100644 +--- a/src/polkit/polkitunixprocess.c ++++ b/src/polkit/polkitunixprocess.c +@@ -159,9 +159,14 @@ polkit_unix_process_set_property (GObject *object, + polkit_unix_process_set_pid (unix_process, g_value_get_int (value)); + break; + +- case PROP_UID: +- polkit_unix_process_set_uid (unix_process, g_value_get_int (value)); ++ case PROP_UID: { ++ gint val; ++ ++ val = g_value_get_int (value); ++ g_return_if_fail (val != -1); ++ polkit_unix_process_set_uid (unix_process, val); + break; ++ } + + case PROP_START_TIME: + polkit_unix_process_set_start_time (unix_process, g_value_get_uint64 (value)); +@@ -239,7 +244,7 @@ polkit_unix_process_class_init (PolkitUnixProcessClass *klass) + g_param_spec_int ("uid", + "User ID", + "The UNIX user ID", +- -1, ++ G_MININT, + G_MAXINT, + -1, + G_PARAM_CONSTRUCT | +@@ -303,7 +308,6 @@ polkit_unix_process_set_uid (PolkitUnixProcess *process, + gint uid) + { + g_return_if_fail (POLKIT_IS_UNIX_PROCESS (process)); +- g_return_if_fail (uid >= -1); + process->uid = uid; + } + +diff --git a/src/polkit/polkitunixuser.c b/src/polkit/polkitunixuser.c +index 8bfd3a1..234a697 100644 +--- a/src/polkit/polkitunixuser.c ++++ b/src/polkit/polkitunixuser.c +@@ -72,6 +72,7 @@ G_DEFINE_TYPE_WITH_CODE (PolkitUnixUser, polkit_unix_user, G_TYPE_OBJECT, + static void + polkit_unix_user_init (PolkitUnixUser *unix_user) + { ++ unix_user->uid = -1; /* (uid_t) -1 is not a valid UID under Linux */ + unix_user->name = NULL; + } + +@@ -112,11 +113,14 @@ polkit_unix_user_set_property (GObject *object, + GParamSpec *pspec) + { + PolkitUnixUser *unix_user = POLKIT_UNIX_USER (object); ++ gint val; + + switch (prop_id) + { + case PROP_UID: +- unix_user->uid = g_value_get_int (value); ++ val = g_value_get_int (value); ++ g_return_if_fail (val != -1); ++ unix_user->uid = val; + break; + + default: +@@ -144,9 +148,9 @@ polkit_unix_user_class_init (PolkitUnixUserClass *klass) + g_param_spec_int ("uid", + "User ID", + "The UNIX user ID", +- 0, ++ G_MININT, + G_MAXINT, +- 0, ++ -1, + G_PARAM_CONSTRUCT | + G_PARAM_READWRITE | + G_PARAM_STATIC_NAME | +@@ -182,6 +186,7 @@ polkit_unix_user_set_uid (PolkitUnixUser *user, + gint uid) + { + g_return_if_fail (POLKIT_IS_UNIX_USER (user)); ++ g_return_if_fail (uid != -1); + user->uid = uid; + } + +@@ -196,6 +201,8 @@ polkit_unix_user_set_uid (PolkitUnixUser *user, + PolkitIdentity * + polkit_unix_user_new (gint uid) + { ++ g_return_val_if_fail (uid != -1, NULL); ++ + return POLKIT_IDENTITY (g_object_new (POLKIT_TYPE_UNIX_USER, + "uid", uid, + NULL)); +-- +2.18.1 + + +From b534a10727455409acd54018a9c91000e7626126 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl> +Date: Mon, 3 Dec 2018 11:20:34 +0100 +Subject: [PATCH 2/2] tests: add tests for high uids + +--- + test/data/etc/group | 1 + + test/data/etc/passwd | 2 + + .../etc/polkit-1/rules.d/10-testing.rules | 21 ++++++ + .../test-polkitbackendjsauthority.c | 72 +++++++++++++++++++ + 4 files changed, 96 insertions(+) + +diff --git a/test/data/etc/group b/test/data/etc/group +index 12ef328..b9acab9 100644 +--- a/test/data/etc/group ++++ b/test/data/etc/group +@@ -5,3 +5,4 @@ john:x:500: + jane:x:501: + sally:x:502: + henry:x:503: ++highuid2:x:4000000000: +diff --git a/test/data/etc/passwd b/test/data/etc/passwd +index 8544feb..5cf14a5 100644 +--- a/test/data/etc/passwd ++++ b/test/data/etc/passwd +@@ -3,3 +3,5 @@ john:x:500:500:John Done:/home/john:/bin/bash + jane:x:501:501:Jane Smith:/home/jane:/bin/bash + sally:x:502:502:Sally Derp:/home/sally:/bin/bash + henry:x:503:503:Henry Herp:/home/henry:/bin/bash ++highuid1:x:2147483648:2147483648:The first high uid:/home/highuid1:/sbin/nologin ++highuid2:x:4000000000:4000000000:An example high uid:/home/example:/sbin/nologin +diff --git a/test/data/etc/polkit-1/rules.d/10-testing.rules b/test/data/etc/polkit-1/rules.d/10-testing.rules +index 446e622..98bf062 100644 +--- a/test/data/etc/polkit-1/rules.d/10-testing.rules ++++ b/test/data/etc/polkit-1/rules.d/10-testing.rules +@@ -53,6 +53,27 @@ polkit.addRule(function(action, subject) { + } + }); + ++polkit.addRule(function(action, subject) { ++ if (action.id == "net.company.john_action") { ++ if (subject.user == "john") { ++ return polkit.Result.YES; ++ } else { ++ return polkit.Result.NO; ++ } ++ } ++}); ++ ++polkit.addRule(function(action, subject) { ++ if (action.id == "net.company.highuid2_action") { ++ if (subject.user == "highuid2") { ++ return polkit.Result.YES; ++ } else { ++ return polkit.Result.NO; ++ } ++ } ++}); ++ ++ + // --------------------------------------------------------------------- + // variables + +diff --git a/test/polkitbackend/test-polkitbackendjsauthority.c b/test/polkitbackend/test-polkitbackendjsauthority.c +index b484a26..71aad23 100644 +--- a/test/polkitbackend/test-polkitbackendjsauthority.c ++++ b/test/polkitbackend/test-polkitbackendjsauthority.c +@@ -330,6 +330,78 @@ static const RulesTestCase rules_test_cases[] = { + NULL, + POLKIT_IMPLICIT_AUTHORIZATION_AUTHORIZED, + }, ++ ++ { ++ /* highuid1 is not a member of group 'users', see test/data/etc/group */ ++ "group_membership_with_non_member(highuid22)", ++ "net.company.group.only_group_users", ++ "unix-user:highuid2", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, ++ ++ { ++ /* highuid2 is not a member of group 'users', see test/data/etc/group */ ++ "group_membership_with_non_member(highuid21)", ++ "net.company.group.only_group_users", ++ "unix-user:highuid2", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, ++ ++ { ++ /* highuid1 is not a member of group 'users', see test/data/etc/group */ ++ "group_membership_with_non_member(highuid24)", ++ "net.company.group.only_group_users", ++ "unix-user:2147483648", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, ++ ++ { ++ /* highuid2 is not a member of group 'users', see test/data/etc/group */ ++ "group_membership_with_non_member(highuid23)", ++ "net.company.group.only_group_users", ++ "unix-user:4000000000", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, ++ ++ { ++ /* john is authorized to do this, see 10-testing.rules */ ++ "john_action", ++ "net.company.john_action", ++ "unix-user:john", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_AUTHORIZED, ++ }, ++ ++ { ++ /* only john is authorized to do this, see 10-testing.rules */ ++ "jane_action", ++ "net.company.john_action", ++ "unix-user:jane", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, ++ ++ { ++ /* highuid2 is authorized to do this, see 10-testing.rules */ ++ "highuid2_action", ++ "net.company.highuid2_action", ++ "unix-user:highuid2", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_AUTHORIZED, ++ }, ++ ++ { ++ /* only highuid2 is authorized to do this, see 10-testing.rules */ ++ "highuid1_action", ++ "net.company.highuid2_action", ++ "unix-user:highuid1", ++ NULL, ++ POLKIT_IMPLICIT_AUTHORIZATION_NOT_AUTHORIZED, ++ }, + }; + + /* ---------------------------------------------------------------------------------------------------- */ +-- +2.18.1 + |