load-fragment: allow quoting in command name and document allowed escapes
The handling of the command name and other arguments is unified. This simplifies things and should make them more predictable for users. Incidentally, this makes ExecStart handling match the .desktop file specification, apart for the requirment for an absolute path. https://bugs.freedesktop.org/show_bug.cgi?id=86171
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
+66
-64
@@ -547,9 +547,9 @@ int config_parse_exec(const char *unit,
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* overriding of argv[0]. */
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for (;;) {
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int i;
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const char *word, *state;
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const char *word, *state, *reason;
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size_t l;
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bool honour_argv0 = false, ignore = false;
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bool separate_argv0 = false, ignore = false;
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path = NULL;
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nce = NULL;
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@@ -560,28 +560,23 @@ int config_parse_exec(const char *unit,
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if (rvalue[0] == 0)
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break;
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for (i = 0; i < 2; i++) {
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if (rvalue[0] == '-' && !ignore) {
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ignore = true;
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rvalue ++;
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}
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if (rvalue[0] == '@' && !honour_argv0) {
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honour_argv0 = true;
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rvalue ++;
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}
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}
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if (*rvalue != '/') {
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log_syntax(unit, LOG_ERR, filename, line, EINVAL,
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"Executable path is not absolute, ignoring: %s", rvalue);
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return 0;
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}
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k = 0;
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FOREACH_WORD_QUOTED(word, l, rvalue, state) {
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if (strneq(word, ";", MAX(l, 1U)))
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goto found;
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if (k == 0) {
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for (i = 0; i < 2; i++) {
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if (*word == '-' && !ignore) {
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ignore = true;
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word ++;
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}
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if (*word == '@' && !separate_argv0) {
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separate_argv0 = true;
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word ++;
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}
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}
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} else
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if (strneq(word, ";", MAX(l, 1U)))
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goto found;
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k++;
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}
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@@ -592,60 +587,69 @@ int config_parse_exec(const char *unit,
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}
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found:
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n = new(char*, k + !honour_argv0);
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n = new(char*, k + !separate_argv0);
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if (!n)
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return log_oom();
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k = 0;
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FOREACH_WORD_QUOTED(word, l, rvalue, state) {
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if (strneq(word, ";", MAX(l, 1U)))
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char *c;
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unsigned skip;
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if (separate_argv0 ? path == NULL : k == 0) {
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/* first word, very special */
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skip = separate_argv0 + ignore;
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/* skip special chars in the beginning */
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assert(skip < l);
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} else if (strneq(word, ";", MAX(l, 1U)))
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/* new commandline */
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break;
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else if (strneq(word, "\\;", MAX(l, 1U))) {
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word ++;
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l --;
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else
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skip = strneq(word, "\\;", MAX(l, 1U));
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c = cunescape_length(word + skip, l - skip);
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if (!c) {
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r = log_oom();
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goto fail;
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}
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if (honour_argv0 && word == rvalue) {
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assert(!path);
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path = strndup(word, l);
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if (!path) {
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r = log_oom();
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goto fail;
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}
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if (!utf8_is_valid(path)) {
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log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
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r = 0;
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goto fail;
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}
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} else {
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char *c;
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c = n[k++] = cunescape_length(word, l);
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if (!c) {
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r = log_oom();
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goto fail;
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}
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if (!utf8_is_valid(c)) {
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log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
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r = 0;
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goto fail;
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}
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if (!utf8_is_valid(c)) {
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log_invalid_utf8(unit, LOG_ERR, filename, line, EINVAL, rvalue);
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r = 0;
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goto fail;
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}
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/* where to stuff this? */
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if (separate_argv0 && path == NULL)
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path = c;
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else
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n[k++] = c;
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}
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n[k] = NULL;
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if (!n[0]) {
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log_syntax(unit, LOG_ERR, filename, line, EINVAL,
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"Invalid command line, ignoring: %s", rvalue);
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r = 0;
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goto fail;
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}
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log_debug("path: %s", path ?: n[0]);
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if (!n[0])
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reason = "Empty executable name or zeroeth argument";
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else if (!string_is_safe(path ?: n[0]))
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reason = "Executable path contains special characters";
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else if (!path_is_absolute(path ?: n[0]))
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reason = "Executable path is not absolute";
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else if (endswith(path ?: n[0], "/"))
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reason = "Executable path specifies a directory";
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else
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goto ok;
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log_syntax(unit, LOG_ERR, filename, line, EINVAL,
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"%s, ignoring: %s", reason, rvalue);
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r = 0;
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goto fail;
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ok:
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if (!path) {
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path = strdup(n[0]);
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if (!path) {
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@@ -654,8 +658,6 @@ int config_parse_exec(const char *unit,
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}
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}
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assert(path_is_absolute(path));
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nce = new0(ExecCommand, 1);
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if (!nce) {
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r = log_oom();
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+123
-33
@@ -74,31 +74,34 @@ static void check_execcommand(ExecCommand *c,
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const char* argv2,
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bool ignore) {
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assert_se(c);
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log_info("%s %s %s %s",
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log_info("expect: \"%s\" [\"%s\" \"%s\" \"%s\"]",
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path, argv0 ?: path, argv1, argv2);
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log_info("actual: \"%s\" [\"%s\" \"%s\" \"%s\"]",
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c->path, c->argv[0], c->argv[1], c->argv[2]);
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assert_se(streq(c->path, path));
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assert_se(streq(c->argv[0], argv0));
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assert_se(streq(c->argv[1], argv1));
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assert_se(streq(c->argv[0], argv0 ?: path));
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assert_se(streq_ptr(c->argv[1], argv1));
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assert_se(streq_ptr(c->argv[2], argv2));
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assert_se(c->ignore == ignore);
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}
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static void test_config_parse_exec(void) {
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/* int config_parse_exec( */
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/* const char *filename, */
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/* unsigned line, */
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/* const char *section, */
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/* unsigned section_line, */
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/* const char *lvalue, */
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/* int ltype, */
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/* const char *rvalue, */
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/* void *data, */
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/* void *userdata) */
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/* int config_parse_exec(
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const char *filename,
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unsigned line,
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const char *section,
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unsigned section_line,
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const char *lvalue,
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int ltype,
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const char *rvalue,
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void *data,
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void *userdata) */
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int r;
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ExecCommand *c = NULL, *c1;
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const char *ccc;
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/* basic test */
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log_info("/* basic test */");
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r = config_parse_exec(NULL, "fake", 1, "section", 1,
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"LValue", 0, "/RValue r1",
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&c, NULL);
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@@ -106,52 +109,60 @@ static void test_config_parse_exec(void) {
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check_execcommand(c, "/RValue", "/RValue", "r1", NULL, false);
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r = config_parse_exec(NULL, "fake", 2, "section", 1,
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"LValue", 0, "/RValue///slashes/// r1",
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"LValue", 0, "/RValue///slashes r1///",
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&c, NULL);
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/* test slashes */
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log_info("/* test slashes */");
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assert_se(r >= 0);
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c1 = c->command_next;
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check_execcommand(c1, "/RValue/slashes", "/RValue///slashes///", "r1", NULL, false);
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check_execcommand(c1, "/RValue/slashes", "/RValue///slashes", "r1///", NULL, false);
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/* honour_argv0 */
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log_info("/* trailing slash */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "/RValue/ argv0 r1",
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&c, NULL);
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assert_se(r == 0);
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assert_se(c1->command_next == NULL);
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log_info("/* honour_argv0 */");
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r = config_parse_exec(NULL, "fake", 3, "section", 1,
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"LValue", 0, "@/RValue///slashes2/// argv0 r1",
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"LValue", 0, "@/RValue///slashes2 ///argv0 r1",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1, "/RValue/slashes2", "argv0", "r1", NULL, false);
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check_execcommand(c1, "/RValue/slashes2", "///argv0", "r1", NULL, false);
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/* ignore && honour_argv0 */
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log_info("/* ignore && honour_argv0 */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "-@/RValue///slashes3/// argv0a r1",
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"LValue", 0, "-@/RValue///slashes3 argv0a r1",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1, "/RValue/slashes3", "argv0a", "r1", NULL, true);
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/* ignore && honour_argv0 */
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log_info("/* ignore && honour_argv0 */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "@-/RValue///slashes4/// argv0b r1",
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"LValue", 0, "@-/RValue///slashes4 argv0b r1",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1, "/RValue/slashes4", "argv0b", "r1", NULL, true);
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/* ignore && ignore */
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log_info("/* ignore && ignore */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "--/RValue argv0 r1",
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&c, NULL);
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assert_se(r == 0);
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assert_se(c1->command_next == NULL);
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/* ignore && ignore */
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log_info("/* ignore && ignore (2) */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "-@-/RValue argv0 r1",
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&c, NULL);
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assert_se(r == 0);
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assert_se(c1->command_next == NULL);
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/* semicolon */
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log_info("/* semicolon */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"-@/RValue argv0 r1 ; "
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@@ -162,9 +173,9 @@ static void test_config_parse_exec(void) {
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check_execcommand(c1, "/RValue", "argv0", "r1", NULL, true);
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c1 = c1->command_next;
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check_execcommand(c1, "/goo/goo", "/goo/goo", "boo", NULL, false);
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check_execcommand(c1, "/goo/goo", NULL, "boo", NULL, false);
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/* trailing semicolon */
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log_info("/* trailing semicolon */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"-@/RValue argv0 r1 ; ",
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@@ -175,16 +186,16 @@ static void test_config_parse_exec(void) {
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assert_se(c1->command_next == NULL);
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/* escaped semicolon */
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log_info("/* escaped semicolon */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"/bin/find \\;",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1, "/bin/find", "/bin/find", ";", NULL, false);
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check_execcommand(c1, "/bin/find", NULL, ";", NULL, false);
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/* escaped semicolon with following arg */
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log_info("/* escaped semicolon with following arg */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"/sbin/find \\; x",
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@@ -192,7 +203,86 @@ static void test_config_parse_exec(void) {
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/sbin/find", "/sbin/find", ";", "x", false);
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"/sbin/find", NULL, ";", "x", false);
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log_info("/* spaces in the filename */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"\"/PATH WITH SPACES/daemon\" -1 -2",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/PATH WITH SPACES/daemon", NULL, "-1", "-2", false);
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log_info("/* spaces in the filename, no args */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"\"/PATH WITH SPACES/daemon -1 -2\"",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/PATH WITH SPACES/daemon -1 -2", NULL, NULL, NULL, false);
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log_info("/* spaces in the filename, everything quoted */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"\"/PATH WITH SPACES/daemon\" \"-1\" '-2'",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/PATH WITH SPACES/daemon", NULL, "-1", "-2", false);
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log_info("/* escaped spaces in the filename */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"\"/PATH\\sWITH\\sSPACES/daemon\" '-1 -2'",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/PATH WITH SPACES/daemon", NULL, "-1 -2", NULL, false);
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log_info("/* escaped spaces in the filename (2) */");
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r = config_parse_exec(NULL, "fake", 5, "section", 1,
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"LValue", 0,
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"\"/PATH\\x20WITH\\x20SPACES/daemon\" \"-1 -2\"",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1,
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"/PATH WITH SPACES/daemon", NULL, "-1 -2", NULL, false);
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for (ccc = "abfnrtv\\\'\"x"; *ccc; ccc++) {
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/* \\x is an incomplete hexadecimal sequence, invalid because of the slash */
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char path[] = "/path\\X";
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path[sizeof(path) - 2] = *ccc;
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log_info("/* invalid character: \\%c */", *ccc);
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, path,
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&c, NULL);
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assert_se(r == 0);
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assert_se(c1->command_next == NULL);
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}
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log_info("/* valid character: \\s */");
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "/path\\s",
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&c, NULL);
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assert_se(r >= 0);
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c1 = c1->command_next;
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check_execcommand(c1, "/path ", NULL, NULL, NULL, false);
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log_info("/* trailing backslash: \\ */");
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/* backslash is invalid */
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r = config_parse_exec(NULL, "fake", 4, "section", 1,
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"LValue", 0, "/path\\",
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&c, NULL);
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assert_se(r == 0);
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assert_se(c1->command_next == NULL);
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exec_command_free_list(c);
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}
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