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From 87df0601074b024ab591534e0e78b2d1e7013a8d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Wed, 9 Mar 2022 22:29:19 +0100
Subject: [PATCH] shared/specifier: fix %u/%U/%g/%G when called as unprivileged
user
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
We would resolve those specifiers to the calling user/group. This is mostly OK
when done in the manager, because the manager generally operates as root
in system mode, and a non-root in user mode. It would still be wrong if
called with --test though. But in systemctl, this would be generally wrong,
since we can call 'systemctl --system' as a normal user, either for testing
or even for actual operation with '--root=…'.
When operating in --global mode, %u/%U/%g/%G should return an error.
The information whether we're operating in system mode, user mode, or global
mode is passed as the data pointer to specifier_group_name(), specifier_user_name(),
specifier_group_id(), specifier_user_id(). We can't use userdata, because
it's already used for other things.
(cherry picked from commit 172e9cc3ee3dcca288d04c744984a9a3b2a0d008)
Related: #2082131
---
src/core/unit-printf.c | 4 +-
src/shared/install-printf.c | 9 ++-
src/shared/install-printf.h | 7 ++-
src/shared/install.c | 9 +--
src/shared/specifier.c | 52 ++++++++++++++---
src/shared/specifier.h | 10 ++--
src/test/test-load-fragment.c | 101 +++++++++++++++++++---------------
src/test/test-specifier.c | 3 +-
src/tmpfiles/tmpfiles.c | 53 +++++++++---------
test/test-systemctl-enable.sh | 11 ++--
test/test-systemd-tmpfiles.py | 8 +--
11 files changed, 163 insertions(+), 104 deletions(-)
diff --git a/src/core/unit-printf.c b/src/core/unit-printf.c
index 46c383b841..3086356419 100644
--- a/src/core/unit-printf.c
+++ b/src/core/unit-printf.c
@@ -190,7 +190,7 @@ int unit_name_printf(const Unit *u, const char* format, char **ret) {
COMMON_SYSTEM_SPECIFIERS,
- COMMON_CREDS_SPECIFIERS,
+ COMMON_CREDS_SPECIFIERS(u->manager->unit_file_scope),
{}
};
@@ -256,7 +256,7 @@ int unit_full_printf_full(const Unit *u, const char *format, size_t max_length,
COMMON_SYSTEM_SPECIFIERS,
- COMMON_CREDS_SPECIFIERS,
+ COMMON_CREDS_SPECIFIERS(u->manager->unit_file_scope),
COMMON_TMP_SPECIFIERS,
{}
diff --git a/src/shared/install-printf.c b/src/shared/install-printf.c
index 6ff4198ac9..963102674b 100644
--- a/src/shared/install-printf.c
+++ b/src/shared/install-printf.c
@@ -103,7 +103,12 @@ static int specifier_last_component(char specifier, const void *data, const char
return 0;
}
-int install_name_printf(const UnitFileInstallInfo *i, const char *format, const char *root, char **ret) {
+int install_name_printf(
+ UnitFileScope scope,
+ const UnitFileInstallInfo *i,
+ const char *format,
+ const char *root,
+ char **ret) {
/* This is similar to unit_name_printf() */
const Specifier table[] = {
@@ -115,7 +120,7 @@ int install_name_printf(const UnitFileInstallInfo *i, const char *format, const
COMMON_SYSTEM_SPECIFIERS,
- COMMON_CREDS_SPECIFIERS,
+ COMMON_CREDS_SPECIFIERS(scope),
{}
};
diff --git a/src/shared/install-printf.h b/src/shared/install-printf.h
index 5ca9406797..d2cccdf66d 100644
--- a/src/shared/install-printf.h
+++ b/src/shared/install-printf.h
@@ -4,4 +4,9 @@
#include "install.h"
#include "unit-name.h"
-int install_name_printf(const UnitFileInstallInfo *i, const char *format, const char *root, char **ret);
+int install_name_printf(
+ UnitFileScope scope,
+ const UnitFileInstallInfo *i,
+ const char *format,
+ const char *root,
+ char **ret);
diff --git a/src/shared/install.c b/src/shared/install.c
index bfdeee48bf..8d82cb6b16 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -1160,7 +1160,7 @@ static int config_parse_also(
if (r == 0)
break;
- r = install_name_printf(info, word, info->root, &printed);
+ r = install_name_printf(ctx->scope, info, word, info->root, &printed);
if (r < 0)
return log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to resolve unit name in Also=\"%s\": %m", word);
@@ -1191,6 +1191,7 @@ static int config_parse_default_instance(
void *data,
void *userdata) {
+ InstallContext *ctx = ASSERT_PTR(data);
UnitFileInstallInfo *info = ASSERT_PTR(userdata);
_cleanup_free_ char *printed = NULL;
int r;
@@ -1208,7 +1209,7 @@ static int config_parse_default_instance(
return log_syntax(unit, LOG_WARNING, filename, line, 0,
"DefaultInstance= only makes sense for template units, ignoring.");
- r = install_name_printf(info, rvalue, info->root, &printed);
+ r = install_name_printf(ctx->scope, info, rvalue, info->root, &printed);
if (r < 0)
return log_syntax(unit, LOG_WARNING, filename, line, r,
"Failed to resolve instance name in DefaultInstance=\"%s\": %m", rvalue);
@@ -1780,7 +1781,7 @@ static int install_info_symlink_alias(
STRV_FOREACH(s, info->aliases) {
_cleanup_free_ char *alias_path = NULL, *dst = NULL, *dst_updated = NULL;
- q = install_name_printf(info, *s, info->root, &dst);
+ q = install_name_printf(scope, info, *s, info->root, &dst);
if (q < 0) {
unit_file_changes_add(changes, n_changes, q, *s, NULL);
return q;
@@ -1867,7 +1868,7 @@ static int install_info_symlink_wants(
STRV_FOREACH(s, list) {
_cleanup_free_ char *path = NULL, *dst = NULL;
- q = install_name_printf(info, *s, info->root, &dst);
+ q = install_name_printf(scope, info, *s, info->root, &dst);
if (q < 0) {
unit_file_changes_add(changes, n_changes, q, *s, NULL);
return q;
diff --git a/src/shared/specifier.c b/src/shared/specifier.c
index a917378427..ac353a651c 100644
--- a/src/shared/specifier.c
+++ b/src/shared/specifier.c
@@ -21,6 +21,7 @@
#include "specifier.h"
#include "string-util.h"
#include "strv.h"
+#include "unit-file.h"
#include "user-util.h"
/*
@@ -253,9 +254,15 @@ int specifier_os_image_version(char specifier, const void *data, const char *roo
}
int specifier_group_name(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
+ UnitFileScope scope = PTR_TO_INT(data);
char *t;
- t = gid_to_name(getgid());
+ assert(ret);
+
+ if (scope == UNIT_FILE_GLOBAL)
+ return -EINVAL;
+
+ t = gid_to_name(scope == UNIT_FILE_USER ? getgid() : 0);
if (!t)
return -ENOMEM;
@@ -264,23 +271,42 @@ int specifier_group_name(char specifier, const void *data, const char *root, con
}
int specifier_group_id(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
- if (asprintf(ret, UID_FMT, getgid()) < 0)
+ UnitFileScope scope = PTR_TO_INT(data);
+ gid_t gid;
+
+ assert(ret);
+
+ if (scope == UNIT_FILE_GLOBAL)
+ return -EINVAL;
+
+ gid = scope == UNIT_FILE_USER ? getgid() : 0;
+
+ if (asprintf(ret, UID_FMT, gid) < 0)
return -ENOMEM;
return 0;
}
int specifier_user_name(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
+ UnitFileScope scope = PTR_TO_INT(data);
+ uid_t uid;
char *t;
- /* If we are UID 0 (root), this will not result in NSS, otherwise it might. This is good, as we want to be able
- * to run this in PID 1, where our user ID is 0, but where NSS lookups are not allowed.
+ assert(ret);
- * We don't use getusername_malloc() here, because we don't want to look at $USER, to remain consistent with
- * specifer_user_id() below.
+ if (scope == UNIT_FILE_GLOBAL)
+ return -EINVAL;
+
+ uid = scope == UNIT_FILE_USER ? getuid() : 0;
+
+ /* If we are UID 0 (root), this will not result in NSS, otherwise it might. This is good, as we want
+ * to be able to run this in PID 1, where our user ID is 0, but where NSS lookups are not allowed.
+
+ * We don't use getusername_malloc() here, because we don't want to look at $USER, to remain
+ * consistent with specifer_user_id() below.
*/
- t = uid_to_name(getuid());
+ t = uid_to_name(uid);
if (!t)
return -ENOMEM;
@@ -289,7 +315,17 @@ int specifier_user_name(char specifier, const void *data, const char *root, cons
}
int specifier_user_id(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
- if (asprintf(ret, UID_FMT, getuid()) < 0)
+ UnitFileScope scope = PTR_TO_INT(data);
+ uid_t uid;
+
+ assert(ret);
+
+ if (scope == UNIT_FILE_GLOBAL)
+ return -EINVAL;
+
+ uid = scope == UNIT_FILE_USER ? getuid() : 0;
+
+ if (asprintf(ret, UID_FMT, uid) < 0)
return -ENOMEM;
return 0;
diff --git a/src/shared/specifier.h b/src/shared/specifier.h
index c433ee2d63..3c619a6c8f 100644
--- a/src/shared/specifier.h
+++ b/src/shared/specifier.h
@@ -80,11 +80,11 @@ int specifier_var_tmp_dir(char specifier, const void *data, const char *root, co
{ 'w', specifier_os_version_id, NULL }, \
{ 'W', specifier_os_variant_id, NULL }
-#define COMMON_CREDS_SPECIFIERS \
- { 'g', specifier_group_name, NULL }, \
- { 'G', specifier_group_id, NULL }, \
- { 'u', specifier_user_name, NULL }, \
- { 'U', specifier_user_id, NULL }
+#define COMMON_CREDS_SPECIFIERS(scope) \
+ { 'g', specifier_group_name, INT_TO_PTR(scope) }, \
+ { 'G', specifier_group_id, INT_TO_PTR(scope) }, \
+ { 'u', specifier_user_name, INT_TO_PTR(scope) }, \
+ { 'U', specifier_user_id, INT_TO_PTR(scope) }
#define COMMON_TMP_SPECIFIERS \
{ 'T', specifier_tmp_dir, NULL }, \
diff --git a/src/test/test-load-fragment.c b/src/test/test-load-fragment.c
index c579be4150..9df53cec2b 100644
--- a/src/test/test-load-fragment.c
+++ b/src/test/test-load-fragment.c
@@ -526,59 +526,74 @@ TEST(install_printf, .sd_booted = true) {
assert_se(user = uid_to_name(getuid()));
assert_se(asprintf(&uid, UID_FMT, getuid()) >= 0);
-#define expect(src, pattern, result) \
+#define expect(scope, src, pattern, result) \
do { \
- _cleanup_free_ char *t = NULL; \
- _cleanup_free_ char \
- *d1 = strdup(i.name), \
- *d2 = strdup(i.path); \
- assert_se(install_name_printf(&src, pattern, NULL, &t) >= 0 || !result); \
+ _cleanup_free_ char *t = NULL, \
+ *d1 = ASSERT_PTR(strdup(i.name)), \
+ *d2 = ASSERT_PTR(strdup(i.path)); \
+ int r = install_name_printf(scope, &src, pattern, NULL, &t); \
+ assert_se(result ? r >= 0 : r < 0); \
memzero(i.name, strlen(i.name)); \
memzero(i.path, strlen(i.path)); \
- assert_se(d1 && d2); \
if (result) { \
printf("%s\n", t); \
assert_se(streq(t, result)); \
- } else assert_se(t == NULL); \
+ } else \
+ assert_se(!t); \
strcpy(i.name, d1); \
strcpy(i.path, d2); \
} while (false)
- expect(i, "%n", "name.service");
- expect(i, "%N", "name");
- expect(i, "%p", "name");
- expect(i, "%i", "");
- expect(i, "%j", "name");
- expect(i, "%g", group);
- expect(i, "%G", gid);
- expect(i, "%u", user);
- expect(i, "%U", uid);
-
- expect(i, "%m", mid);
- expect(i, "%b", bid);
- expect(i, "%H", host);
-
- expect(i2, "%g", group);
- expect(i2, "%G", gid);
- expect(i2, "%u", user);
- expect(i2, "%U", uid);
-
- expect(i3, "%n", "name@inst.service");
- expect(i3, "%N", "name@inst");
- expect(i3, "%p", "name");
- expect(i3, "%g", group);
- expect(i3, "%G", gid);
- expect(i3, "%u", user);
- expect(i3, "%U", uid);
-
- expect(i3, "%m", mid);
- expect(i3, "%b", bid);
- expect(i3, "%H", host);
-
- expect(i4, "%g", group);
- expect(i4, "%G", gid);
- expect(i4, "%u", user);
- expect(i4, "%U", uid);
+ expect(UNIT_FILE_SYSTEM, i, "%n", "name.service");
+ expect(UNIT_FILE_SYSTEM, i, "%N", "name");
+ expect(UNIT_FILE_SYSTEM, i, "%p", "name");
+ expect(UNIT_FILE_SYSTEM, i, "%i", "");
+ expect(UNIT_FILE_SYSTEM, i, "%j", "name");
+ expect(UNIT_FILE_SYSTEM, i, "%g", "root");
+ expect(UNIT_FILE_SYSTEM, i, "%G", "0");
+ expect(UNIT_FILE_SYSTEM, i, "%u", "root");
+ expect(UNIT_FILE_SYSTEM, i, "%U", "0");
+
+ expect(UNIT_FILE_SYSTEM, i, "%m", mid);
+ expect(UNIT_FILE_SYSTEM, i, "%b", bid);
+ expect(UNIT_FILE_SYSTEM, i, "%H", host);
+
+ expect(UNIT_FILE_SYSTEM, i2, "%g", "root");
+ expect(UNIT_FILE_SYSTEM, i2, "%G", "0");
+ expect(UNIT_FILE_SYSTEM, i2, "%u", "root");
+ expect(UNIT_FILE_SYSTEM, i2, "%U", "0");
+
+ expect(UNIT_FILE_USER, i2, "%g", group);
+ expect(UNIT_FILE_USER, i2, "%G", gid);
+ expect(UNIT_FILE_USER, i2, "%u", user);
+ expect(UNIT_FILE_USER, i2, "%U", uid);
+
+ /* gcc-12.0.1-0.9.fc36.x86_64 insist that streq(…, NULL) is called,
+ * even though the call is inside of a conditional where the pointer is checked. :( */
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wnonnull"
+ expect(UNIT_FILE_GLOBAL, i2, "%g", NULL);
+ expect(UNIT_FILE_GLOBAL, i2, "%G", NULL);
+ expect(UNIT_FILE_GLOBAL, i2, "%u", NULL);
+ expect(UNIT_FILE_GLOBAL, i2, "%U", NULL);
+#pragma GCC diagnostic pop
+
+ expect(UNIT_FILE_SYSTEM, i3, "%n", "name@inst.service");
+ expect(UNIT_FILE_SYSTEM, i3, "%N", "name@inst");
+ expect(UNIT_FILE_SYSTEM, i3, "%p", "name");
+ expect(UNIT_FILE_USER, i3, "%g", group);
+ expect(UNIT_FILE_USER, i3, "%G", gid);
+ expect(UNIT_FILE_USER, i3, "%u", user);
+ expect(UNIT_FILE_USER, i3, "%U", uid);
+
+ expect(UNIT_FILE_SYSTEM, i3, "%m", mid);
+ expect(UNIT_FILE_SYSTEM, i3, "%b", bid);
+ expect(UNIT_FILE_SYSTEM, i3, "%H", host);
+
+ expect(UNIT_FILE_USER, i4, "%g", group);
+ expect(UNIT_FILE_USER, i4, "%G", gid);
+ expect(UNIT_FILE_USER, i4, "%u", user);
+ expect(UNIT_FILE_USER, i4, "%U", uid);
}
static uint64_t make_cap(int cap) {
diff --git a/src/test/test-specifier.c b/src/test/test-specifier.c
index a45d1bd0b9..dd47f0285e 100644
--- a/src/test/test-specifier.c
+++ b/src/test/test-specifier.c
@@ -7,6 +7,7 @@
#include "string-util.h"
#include "strv.h"
#include "tests.h"
+#include "unit-file.h"
static void test_specifier_escape_one(const char *a, const char *b) {
_cleanup_free_ char *x = NULL;
@@ -45,7 +46,7 @@ TEST(specifier_escape_strv) {
static const Specifier specifier_table[] = {
COMMON_SYSTEM_SPECIFIERS,
- COMMON_CREDS_SPECIFIERS,
+ COMMON_CREDS_SPECIFIERS(UNIT_FILE_USER),
{ 'h', specifier_user_home, NULL },
COMMON_TMP_SPECIFIERS,
diff --git a/src/tmpfiles/tmpfiles.c b/src/tmpfiles/tmpfiles.c
index fcab51c208..aa7ff73a36 100644
--- a/src/tmpfiles/tmpfiles.c
+++ b/src/tmpfiles/tmpfiles.c
@@ -204,31 +204,6 @@ STATIC_DESTRUCTOR_REGISTER(arg_image, freep);
static int specifier_machine_id_safe(char specifier, const void *data, const char *root, const void *userdata, char **ret);
static int specifier_directory(char specifier, const void *data, const char *root, const void *userdata, char **ret);
-static const Specifier specifier_table[] = {
- { 'a', specifier_architecture, NULL },
- { 'b', specifier_boot_id, NULL },
- { 'B', specifier_os_build_id, NULL },
- { 'H', specifier_host_name, NULL },
- { 'l', specifier_short_host_name, NULL },
- { 'm', specifier_machine_id_safe, NULL },
- { 'o', specifier_os_id, NULL },
- { 'v', specifier_kernel_release, NULL },
- { 'w', specifier_os_version_id, NULL },
- { 'W', specifier_os_variant_id, NULL },
-
- { 'h', specifier_user_home, NULL },
-
- { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
- { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
- { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
- { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
-
- COMMON_CREDS_SPECIFIERS,
-
- COMMON_TMP_SPECIFIERS,
- {}
-};
-
static int specifier_machine_id_safe(char specifier, const void *data, const char *root, const void *userdata, char **ret) {
int r;
@@ -2743,7 +2718,7 @@ static bool should_include_path(const char *path) {
return false;
}
-static int specifier_expansion_from_arg(Item *i) {
+static int specifier_expansion_from_arg(const Specifier *specifier_table, Item *i) {
int r;
assert(i);
@@ -2951,6 +2926,30 @@ static int parse_line(
assert(line >= 1);
assert(buffer);
+ const Specifier specifier_table[] = {
+ { 'a', specifier_architecture, NULL },
+ { 'b', specifier_boot_id, NULL },
+ { 'B', specifier_os_build_id, NULL },
+ { 'H', specifier_host_name, NULL },
+ { 'l', specifier_short_host_name, NULL },
+ { 'm', specifier_machine_id_safe, NULL },
+ { 'o', specifier_os_id, NULL },
+ { 'v', specifier_kernel_release, NULL },
+ { 'w', specifier_os_version_id, NULL },
+ { 'W', specifier_os_variant_id, NULL },
+
+ { 'h', specifier_user_home, NULL },
+
+ { 'C', specifier_directory, UINT_TO_PTR(DIRECTORY_CACHE) },
+ { 'L', specifier_directory, UINT_TO_PTR(DIRECTORY_LOGS) },
+ { 'S', specifier_directory, UINT_TO_PTR(DIRECTORY_STATE) },
+ { 't', specifier_directory, UINT_TO_PTR(DIRECTORY_RUNTIME) },
+
+ COMMON_CREDS_SPECIFIERS(arg_user ? UNIT_FILE_USER : UNIT_FILE_SYSTEM),
+ COMMON_TMP_SPECIFIERS,
+ {}
+ };
+
r = extract_many_words(
&buffer,
NULL,
@@ -3155,7 +3154,7 @@ static int parse_line(
if (!should_include_path(i.path))
return 0;
- r = specifier_expansion_from_arg(&i);
+ r = specifier_expansion_from_arg(specifier_table, &i);
if (r == -ENXIO)
return log_unresolvable_specifier(fname, line);
if (r < 0) {
diff --git a/test/test-systemctl-enable.sh b/test/test-systemctl-enable.sh
index da1fffe944..8ac1342b91 100644
--- a/test/test-systemctl-enable.sh
+++ b/test/test-systemctl-enable.sh
@@ -500,9 +500,10 @@ check_alias t '' && { echo "Expected failure" >&2; exit 1; }
check_alias T '' && { echo "Expected failure" >&2; exit 1; }
check_alias V '' && { echo "Expected failure" >&2; exit 1; }
-# FIXME: we use the calling user instead of root :(
-check_alias g root || :
-check_alias G 0 || :
+check_alias g root
+check_alias G 0
+check_alias u root
+check_alias U 0
check_alias i ""
@@ -521,10 +522,6 @@ check_alias N 'some-some-link6@'
check_alias p 'some-some-link6'
-# FIXME: we use the calling user instead of root :(
-check_alias u root || :
-check_alias U 0 || :
-
check_alias v "$(uname -r)"
check_alias % '%' && { echo "Expected failure because % is not legal in unit name" >&2; exit 1; }
diff --git a/test/test-systemd-tmpfiles.py b/test/test-systemd-tmpfiles.py
index 3376029463..ba42b3fa37 100755
--- a/test/test-systemd-tmpfiles.py
+++ b/test/test-systemd-tmpfiles.py
@@ -98,13 +98,13 @@ def test_valid_specifiers(*, user):
test_content('f {} - - - - %b', '{}'.format(id128.get_boot().hex), user=user)
test_content('f {} - - - - %H', '{}'.format(socket.gethostname()), user=user)
test_content('f {} - - - - %v', '{}'.format(os.uname().release), user=user)
- test_content('f {} - - - - %U', '{}'.format(os.getuid()), user=user)
- test_content('f {} - - - - %G', '{}'.format(os.getgid()), user=user)
+ test_content('f {} - - - - %U', '{}'.format(os.getuid() if user else 0), user=user)
+ test_content('f {} - - - - %G', '{}'.format(os.getgid() if user else 0), user=user)
- puser = pwd.getpwuid(os.getuid())
+ puser = pwd.getpwuid(os.getuid() if user else 0)
test_content('f {} - - - - %u', '{}'.format(puser.pw_name), user=user)
- pgroup = grp.getgrgid(os.getgid())
+ pgroup = grp.getgrgid(os.getgid() if user else 0)
test_content('f {} - - - - %g', '{}'.format(pgroup.gr_name), user=user)
# Note that %h is the only specifier in which we look the environment,