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generators: be more careful when writing unit settings that support specifier expansion

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Let's always escape strings we receive from the user before writing them
out to unit file settings that suppor specifier expansion, so that user
strings are transported as-is.
This commit is contained in:
Lennart Poettering 2017-11-21 20:09:31 +01:00
parent b238be1e0d
commit 98bad05e75
6 changed files with 118 additions and 33 deletions
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32
src/cryptsetup/cryptsetup-generator.c
View File

@ -32,6 +32,7 @@
#include "parse-util.h"
#include "path-util.h"
#include "proc-cmdline.h"
#include "specifier.h"
#include "string-util.h"
#include "strv.h"
#include "unit-name.h"
@ -60,7 +61,7 @@ static int create_disk(
const char *options) {
_cleanup_free_ char *p = NULL, *n = NULL, *d = NULL, *u = NULL, *e = NULL,
*filtered = NULL;
*filtered = NULL, *u_escaped = NULL, *password_escaped = NULL, *filtered_escaped = NULL, *name_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *dmname;
bool noauto, nofail, tmp, swap, netdev;
@ -80,6 +81,10 @@ static int create_disk(
return -EINVAL;
}
name_escaped = specifier_escape(name);
if (!name_escaped)
return log_oom();
e = unit_name_escape(name);
if (!e)
return log_oom();
@ -96,10 +101,18 @@ static int create_disk(
if (!u)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
password_escaped = specifier_escape(password);
if (!password_escaped)
return log_oom();
f = fopen(p, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", p);
@ -142,7 +155,7 @@ static int create_disk(
fprintf(f, "After=%1$s\nRequires=%1$s\n", dd);
} else
fprintf(f, "RequiresMountsFor=%s\n", password);
fprintf(f, "RequiresMountsFor=%s\n", password_escaped);
}
}
}
@ -160,12 +173,17 @@ static int create_disk(
} else
fprintf(f,
"RequiresMountsFor=%s\n",
u);
u_escaped);
r = generator_write_timeouts(arg_dest, device, name, options, &filtered);
if (r < 0)
return r;
filtered_escaped = specifier_escape(filtered);
if (!filtered_escaped)
return log_oom();
fprintf(f,
"\n[Service]\n"
"Type=oneshot\n"
@ -174,18 +192,18 @@ static int create_disk(
"KeyringMode=shared\n" /* make sure we can share cached keys among instances */
"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '%s' '%s'\n"
"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
name, u, strempty(password), strempty(filtered),
name);
name_escaped, u_escaped, strempty(password_escaped), strempty(filtered_escaped),
name_escaped);
if (tmp)
fprintf(f,
"ExecStartPost=/sbin/mke2fs '/dev/mapper/%s'\n",
name);
name_escaped);
if (swap)
fprintf(f,
"ExecStartPost=/sbin/mkswap '/dev/mapper/%s'\n",
name);
name_escaped);
r = fflush_and_check(f);
if (r < 0)

37
src/fstab-generator/fstab-generator.c
View File

@ -26,8 +26,8 @@
#include "alloc-util.h"
#include "fd-util.h"
#include "fs-util.h"
#include "fileio.h"
#include "fs-util.h"
#include "fstab-util.h"
#include "generator.h"
#include "log.h"
@ -38,6 +38,7 @@
#include "path-util.h"
#include "proc-cmdline.h"
#include "special.h"
#include "specifier.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
@ -68,7 +69,7 @@ static int write_options(FILE *f, const char *options) {
if (streq(options, "defaults"))
return 0;
o = strreplace(options, "%", "%%");
o = specifier_escape(options);
if (!o)
return log_oom();
@ -79,7 +80,7 @@ static int write_options(FILE *f, const char *options) {
static int write_what(FILE *f, const char *what) {
_cleanup_free_ char *w = NULL;
w = strreplace(what, "%", "%%");
w = specifier_escape(what);
if (!w)
return log_oom();
@ -262,7 +263,7 @@ static int write_before(FILE *f, const char *opts) {
}
static int write_requires_mounts_for(FILE *f, const char *opts) {
_cleanup_strv_free_ char **paths = NULL;
_cleanup_strv_free_ char **paths = NULL, **paths_escaped = NULL;
_cleanup_free_ char *res = NULL;
int r;
@ -275,7 +276,11 @@ static int write_requires_mounts_for(FILE *f, const char *opts) {
if (r == 0)
return 0;
res = strv_join(paths, " ");
r = specifier_escape_strv(paths, &paths_escaped);
if (r < 0)
return log_error_errno(r, "Failed to escape paths: %m");
res = strv_join(paths_escaped, " ");
if (!res)
return log_oom();
@ -301,7 +306,8 @@ static int add_mount(
_cleanup_free_ char
*name = NULL, *unit = NULL,
*automount_name = NULL, *automount_unit = NULL,
*filtered = NULL;
*filtered = NULL,
*where_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
int r;
@ -398,14 +404,25 @@ static int add_mount(
fprintf(f, "\n[Mount]\n");
if (original_where)
fprintf(f, "# Canonicalized from %s\n", original_where);
fprintf(f, "Where=%s\n", where);
where_escaped = specifier_escape(where);
if (!where_escaped)
return log_oom();
fprintf(f, "Where=%s\n", where_escaped);
r = write_what(f, what);
if (r < 0)
return r;
if (!isempty(fstype) && !streq(fstype, "auto"))
fprintf(f, "Type=%s\n", fstype);
if (!isempty(fstype) && !streq(fstype, "auto")) {
_cleanup_free_ char *t;
t = specifier_escape(fstype);
if (!t)
return -ENOMEM;
fprintf(f, "Type=%s\n", t);
}
r = generator_write_timeouts(dest, what, where, opts, &filtered);
if (r < 0)
@ -476,7 +493,7 @@ static int add_mount(
"\n"
"[Automount]\n"
"Where=%s\n",
where);
where_escaped);
r = write_idle_timeout(f, where, opts);
if (r < 0)

19
src/gpt-auto-generator/gpt-auto-generator.c
View File

@ -44,6 +44,7 @@
#include "path-util.h"
#include "proc-cmdline.h"
#include "special.h"
#include "specifier.h"
#include "stat-util.h"
#include "string-util.h"
#include "udev-util.h"
@ -57,7 +58,7 @@ static bool arg_root_enabled = true;
static bool arg_root_rw = false;
static int add_cryptsetup(const char *id, const char *what, bool rw, bool require, char **device) {
_cleanup_free_ char *e = NULL, *n = NULL, *p = NULL, *d = NULL;
_cleanup_free_ char *e = NULL, *n = NULL, *p = NULL, *d = NULL, *id_escaped = NULL, *what_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
char *ret;
int r;
@ -77,6 +78,14 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, bool requir
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
id_escaped = specifier_escape(id);
if (!id_escaped)
return log_oom();
what_escaped = specifier_escape(what);
if (!what_escaped)
return log_oom();
p = strjoin(arg_dest, "/", n);
if (!p)
return log_oom();
@ -104,8 +113,8 @@ static int add_cryptsetup(const char *id, const char *what, bool rw, bool requir
"ExecStart=" SYSTEMD_CRYPTSETUP_PATH " attach '%s' '%s' '' '%s'\n"
"ExecStop=" SYSTEMD_CRYPTSETUP_PATH " detach '%s'\n",
d, d,
id, what, rw ? "" : "read-only",
id);
id_escaped, what_escaped, rw ? "" : "read-only",
id_escaped);
r = fflush_and_check(f);
if (r < 0)
@ -165,6 +174,10 @@ static int add_mount(
_cleanup_fclose_ FILE *f = NULL;
int r;
/* Note that we don't apply specifier escaping on the input strings here, since we know they are not configured
* externally, but all originate from our own sources here, and hence we know they contain no % characters that
* could potentially be understood as specifiers. */
assert(id);
assert(what);
assert(where);

13
src/shared/generator.c
View File

@ -33,6 +33,7 @@
#include "mkdir.h"
#include "path-util.h"
#include "special.h"
#include "specifier.h"
#include "string-util.h"
#include "time-util.h"
#include "unit-name.h"
@ -55,15 +56,19 @@ int generator_add_symlink(const char *root, const char *dst, const char *dep_typ
}
static int write_fsck_sysroot_service(const char *dir, const char *what) {
_cleanup_free_ char *device = NULL, *escaped = NULL;
_cleanup_free_ char *device = NULL, *escaped = NULL, *escaped2 = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit;
int r;
escaped = cescape(what);
escaped = specifier_escape(what);
if (!escaped)
return log_oom();
escaped2 = cescape(escaped);
if (!escaped2)
return log_oom();
unit = strjoina(dir, "/systemd-fsck-root.service");
log_debug("Creating %s", unit);
@ -91,9 +96,9 @@ static int write_fsck_sysroot_service(const char *dir, const char *what) {
"ExecStart=" SYSTEMD_FSCK_PATH " %4$s\n"
"TimeoutSec=0\n",
program_invocation_short_name,
what,
escaped,
device,
escaped);
escaped2);
r = fflush_and_check(f);
if (r < 0)

34
src/sysv-generator/sysv-generator.c
View File

@ -39,6 +39,7 @@
#include "path-util.h"
#include "set.h"
#include "special.h"
#include "specifier.h"
#include "stat-util.h"
#include "string-util.h"
#include "strv.h"
@ -119,6 +120,7 @@ static int add_alias(const char *service, const char *alias) {
}
static int generate_unit_file(SysvStub *s) {
_cleanup_free_ char *path_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *unit;
char **p;
@ -129,6 +131,10 @@ static int generate_unit_file(SysvStub *s) {
if (!s->loaded)
return 0;
path_escaped = specifier_escape(s->path);
if (!path_escaped)
return log_oom();
unit = strjoina(arg_dest, "/", s->name);
/* We might already have a symlink with the same name from a Provides:,
@ -148,10 +154,17 @@ static int generate_unit_file(SysvStub *s) {
"[Unit]\n"
"Documentation=man:systemd-sysv-generator(8)\n"
"SourcePath=%s\n",
s->path);
path_escaped);
if (s->description)
fprintf(f, "Description=%s\n", s->description);
if (s->description) {
_cleanup_free_ char *t;
t = specifier_escape(s->description);
if (!t)
return log_oom();
fprintf(f, "Description=%s\n", t);
}
STRV_FOREACH(p, s->before)
fprintf(f, "Before=%s\n", *p);
@ -171,8 +184,15 @@ static int generate_unit_file(SysvStub *s) {
"RemainAfterExit=%s\n",
yes_no(!s->pid_file));
if (s->pid_file)
fprintf(f, "PIDFile=%s\n", s->pid_file);
if (s->pid_file) {
_cleanup_free_ char *t;
t = specifier_escape(s->pid_file);
if (!t)
return log_oom();
fprintf(f, "PIDFile=%s\n", t);
}
/* Consider two special LSB exit codes a clean exit */
if (s->has_lsb)
@ -184,10 +204,10 @@ static int generate_unit_file(SysvStub *s) {
fprintf(f,
"ExecStart=%s start\n"
"ExecStop=%s stop\n",
s->path, s->path);
path_escaped, path_escaped);
if (s->reload)
fprintf(f, "ExecReload=%s reload\n", s->path);
fprintf(f, "ExecReload=%s reload\n", path_escaped);
r = fflush_and_check(f);
if (r < 0)

16
src/veritysetup/veritysetup-generator.c
View File

@ -32,6 +32,7 @@
#include "mkdir.h"
#include "parse-util.h"
#include "proc-cmdline.h"
#include "specifier.h"
#include "string-util.h"
#include "unit-name.h"
@ -42,7 +43,7 @@ static char *arg_data_what = NULL;
static char *arg_hash_what = NULL;
static int create_device(void) {
_cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL;
_cleanup_free_ char *u = NULL, *v = NULL, *d = NULL, *e = NULL, *u_escaped = NULL, *v_escaped = NULL, *root_hash_escaped = NULL;
_cleanup_fclose_ FILE *f = NULL;
const char *p, *to;
int r;
@ -75,6 +76,13 @@ static int create_device(void) {
if (!v)
return log_oom();
u_escaped = specifier_escape(u);
if (!u_escaped)
return log_oom();
v_escaped = specifier_escape(v);
if (!v_escaped)
return log_oom();
r = unit_name_from_path(u, ".device", &d);
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
@ -82,6 +90,10 @@ static int create_device(void) {
if (r < 0)
return log_error_errno(r, "Failed to generate unit name: %m");
root_hash_escaped = specifier_escape(arg_root_hash);
if (!root_hash_escaped)
return log_oom();
f = fopen(p, "wxe");
if (!f)
return log_error_errno(errno, "Failed to create unit file %s: %m", p);
@ -105,7 +117,7 @@ static int create_device(void) {
"ExecStop=" ROOTLIBEXECDIR "/systemd-veritysetup detach root\n",
d, e,
d, e,
u, v, arg_root_hash);
u_escaped, v_escaped, root_hash_escaped);
r = fflush_and_check(f);
if (r < 0)