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-rw-r--r--man/sysusers.d.xml40
-rw-r--r--src/shared/util.c205
-rw-r--r--src/shared/util.h7
-rw-r--r--src/sysusers/sysusers.c174
-rw-r--r--src/test/test-util.c109
5 files changed, 468 insertions, 67 deletions
diff --git a/man/sysusers.d.xml b/man/sysusers.d.xml
index 58f24a62f5..1832ecf0e6 100644
--- a/man/sysusers.d.xml
+++ b/man/sysusers.d.xml
@@ -77,13 +77,14 @@
configuration.</para>
<para>The file format is one line per user or group
- containing name, ID and GECOS field description:</para>
+ containing name, ID, GECOS field description and home directory:</para>
<programlisting># Type Name ID GECOS
u httpd 440 "HTTP User"
u authd /usr/bin/authd "Authorization user"
g input - -
-m authd input</programlisting>
+m authd input
+u root 0 "Superuser" /root</programlisting>
<refsect2>
<title>Type</title>
@@ -103,11 +104,13 @@ m authd input</programlisting>
bearing the same name. The
user's shell will be set to
<filename>/sbin/nologin</filename>,
- the home directory to
- <filename>/</filename>. The
- account will be created
- disabled, so that logins are
- not allowed.</para></listitem>
+ the home directory to the
+ specified home directory, or
+ <filename>/</filename> if none
+ is given. The account will be
+ created disabled, so that
+ logins are not
+ allowed.</para></listitem>
</varlistentry>
<varlistentry>
@@ -160,8 +163,8 @@ m authd input</programlisting>
<varname>g</varname> the numeric 32bit UID or
GID of the user/group. Do not use IDs 65535 or
4294967295, as they have special placeholder
- meanings. Specify "-" for automatic UID/GID
- allocation for the user or
+ meanings. Specify <literal>-</literal> for
+ automatic UID/GID allocation for the user or
group. Alternatively, specify an absolute path
in the file system. In this case the UID/GID
is read from the path's owner/group. This is
@@ -183,7 +186,24 @@ m authd input</programlisting>
<para>Only applies to lines of type
<varname>u</varname> and should otherwise be
- left unset.</para>
+ left unset, or be set to
+ <literal>-</literal>.</para>
+ </refsect2>
+
+ <refsect2>
+ <title>Home Directory</title>
+
+ <para>The home directory for a new system
+ user. If omitted defaults to the root
+ directory. It is recommended to not
+ unnecessarily specify home directories for
+ system users, unless software strictly
+ requires one to be set.</para>
+
+ <para>Only applies to lines of type
+ <varname>u</varname> and should otherwise be
+ left unset, or be set to
+ <literal>-</literal>.</para>
</refsect2>
</refsect1>
diff --git a/src/shared/util.c b/src/shared/util.c
index 18d40f398f..2bb3b5ef1c 100644
--- a/src/shared/util.c
+++ b/src/shared/util.c
@@ -6934,3 +6934,208 @@ int is_symlink(const char *path) {
return 0;
}
+
+int unquote_first_word(const char **p, char **ret) {
+ _cleanup_free_ char *s = NULL;
+ size_t allocated = 0, sz = 0;
+
+ enum {
+ START,
+ VALUE,
+ VALUE_ESCAPE,
+ SINGLE_QUOTE,
+ SINGLE_QUOTE_ESCAPE,
+ DOUBLE_QUOTE,
+ DOUBLE_QUOTE_ESCAPE,
+ SPACE,
+ } state = START;
+
+ assert(p);
+ assert(*p);
+ assert(ret);
+
+ /* Parses the first word of a string, and returns it in
+ * *ret. Removes all quotes in the process. When parsing fails
+ * (because of an uneven number of quotes or similar), leaves
+ * the pointer *p at the first invalid character. */
+
+ for (;;) {
+ char c = **p;
+
+ switch (state) {
+
+ case START:
+ if (c == 0)
+ goto finish;
+ else if (strchr(WHITESPACE, c))
+ break;
+
+ state = VALUE;
+ /* fallthrough */
+
+ case VALUE:
+ if (c == 0)
+ goto finish;
+ else if (c == '\'')
+ state = SINGLE_QUOTE;
+ else if (c == '\\')
+ state = VALUE_ESCAPE;
+ else if (c == '\"')
+ state = DOUBLE_QUOTE;
+ else if (strchr(WHITESPACE, c))
+ state = SPACE;
+ else {
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ }
+
+ break;
+
+ case VALUE_ESCAPE:
+ if (c == 0)
+ return -EINVAL;
+
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ state = VALUE;
+
+ break;
+
+ case SINGLE_QUOTE:
+ if (c == 0)
+ return -EINVAL;
+ else if (c == '\'')
+ state = VALUE;
+ else if (c == '\\')
+ state = SINGLE_QUOTE_ESCAPE;
+ else {
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ }
+
+ break;
+
+ case SINGLE_QUOTE_ESCAPE:
+ if (c == 0)
+ return -EINVAL;
+
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ state = SINGLE_QUOTE;
+ break;
+
+ case DOUBLE_QUOTE:
+ if (c == 0)
+ return -EINVAL;
+ else if (c == '\"')
+ state = VALUE;
+ else if (c == '\\')
+ state = DOUBLE_QUOTE_ESCAPE;
+ else {
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ }
+
+ break;
+
+ case DOUBLE_QUOTE_ESCAPE:
+ if (c == 0)
+ return -EINVAL;
+
+ if (!GREEDY_REALLOC(s, allocated, sz+2))
+ return -ENOMEM;
+
+ s[sz++] = c;
+ state = DOUBLE_QUOTE;
+ break;
+
+ case SPACE:
+ if (c == 0)
+ goto finish;
+ if (!strchr(WHITESPACE, c))
+ goto finish;
+
+ break;
+ }
+
+ (*p) ++;
+ }
+
+finish:
+ if (!s) {
+ *ret = NULL;
+ return 0;
+ }
+
+ s[sz] = 0;
+ *ret = s;
+ s = NULL;
+
+ return 1;
+}
+
+int unquote_many_words(const char **p, ...) {
+ va_list ap;
+ char **l;
+ int n = 0, i, c, r;
+
+ /* Parses a number of words from a string, stripping any
+ * quotes if necessary. */
+
+ assert(p);
+
+ /* Count how many words are expected */
+ va_start(ap, p);
+ for (;;) {
+ if (!va_arg(ap, char **))
+ break;
+ n++;
+ }
+ va_end(ap);
+
+ if (n <= 0)
+ return 0;
+
+ /* Read all words into a temporary array */
+ l = newa0(char*, n);
+ for (c = 0; c < n; c++) {
+
+ r = unquote_first_word(p, &l[c]);
+ if (r < 0) {
+ int j;
+
+ for (j = 0; j < c; j++) {
+ free(l[j]);
+ return r;
+ }
+ }
+
+ if (r == 0)
+ break;
+ }
+
+ /* If we managed to parse all words, return them in the passed
+ * in parameters */
+ va_start(ap, p);
+ for (i = 0; i < n; i++) {
+ char **v;
+
+ v = va_arg(ap, char **);
+ assert(v);
+
+ *v = l[i];
+ }
+ va_end(ap);
+
+ return c;
+}
diff --git a/src/shared/util.h b/src/shared/util.h
index bd8bbb268f..43f4b089b4 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -128,6 +128,8 @@ bool streq_ptr(const char *a, const char *b) _pure_;
#define newa(t, n) ((t*) alloca(sizeof(t)*(n)))
+#define newa0(t, n) ((t*) alloca0(sizeof(t)*(n)))
+
#define newdup(t, p, n) ((t*) memdup_multiply(p, sizeof(t), (n)))
#define malloc0(n) (calloc((n), 1))
@@ -967,4 +969,7 @@ bool is_localhost(const char *hostname);
int take_password_lock(const char *root);
-int is_symlink(const char *path); \ No newline at end of file
+int is_symlink(const char *path);
+
+int unquote_first_word(const char **p, char **ret);
+int unquote_many_words(const char **p, ...) _sentinel_;
diff --git a/src/sysusers/sysusers.c b/src/sysusers/sysusers.c
index f78fb4fff3..eedc1e067e 100644
--- a/src/sysusers/sysusers.c
+++ b/src/sysusers/sysusers.c
@@ -51,6 +51,7 @@ typedef struct Item {
char *uid_path;
char *gid_path;
char *description;
+ char *home;
gid_t gid;
uid_t uid;
@@ -556,19 +557,19 @@ static int write_files(void) {
.pw_uid = i->uid,
.pw_gid = i->gid,
.pw_gecos = i->description,
+
+ /* "x" means the password is stored in
+ * the shadow file */
.pw_passwd = (char*) "x",
- };
- /* Initialize the home directory and the shell
- * to nologin, with one exception: for root we
- * patch in something special */
- if (i->uid == 0) {
- n.pw_shell = (char*) "/bin/sh";
- n.pw_dir = (char*) "/root";
- } else {
- n.pw_shell = (char*) "/sbin/nologin";
- n.pw_dir = (char*) "/";
- }
+ /* We default to the root directory as home */
+ .pw_dir = i->home ? i->home : (char*) "/",
+
+ /* Initialize the shell to nologin,
+ * with one exception: for root we
+ * patch in something special */
+ .pw_shell = i->uid == 0 ? (char*) "/bin/sh" : (char*) "/sbin/nologin",
+ };
errno = 0;
if (putpwent(&n, passwd) != 0) {
@@ -1292,6 +1293,9 @@ static bool item_equal(Item *a, Item *b) {
if (a->gid_set && a->gid != b->gid)
return false;
+ if (!streq_ptr(a->home, b->home))
+ return false;
+
return true;
}
@@ -1330,6 +1334,9 @@ static bool valid_user_group_name(const char *u) {
static bool valid_gecos(const char *d) {
+ if (!d)
+ return false;
+
if (!utf8_is_valid(d))
return false;
@@ -1343,6 +1350,30 @@ static bool valid_gecos(const char *d) {
return true;
}
+static bool valid_home(const char *p) {
+
+ if (isempty(p))
+ return false;
+
+ if (!utf8_is_valid(p))
+ return false;
+
+ if (string_has_cc(p, NULL))
+ return false;
+
+ if (!path_is_absolute(p))
+ return false;
+
+ if (!path_is_safe(p))
+ return false;
+
+ /* Colons are used as field separators, and hence not OK */
+ if (strchr(p, ':'))
+ return false;
+
+ return true;
+}
+
static int parse_line(const char *fname, unsigned line, const char *buffer) {
static const Specifier specifier_table[] = {
@@ -1353,27 +1384,34 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
{}
};
- _cleanup_free_ char *action = NULL, *name = NULL, *id = NULL, *resolved_name = NULL;
+ _cleanup_free_ char *action = NULL, *name = NULL, *id = NULL, *resolved_name = NULL, *description = NULL, *home = NULL;
_cleanup_(item_freep) Item *i = NULL;
Item *existing;
Hashmap *h;
- int r, n = -1;
+ int r;
+ const char *p;
assert(fname);
assert(line >= 1);
assert(buffer);
- r = sscanf(buffer,
- "%ms %ms %ms %n",
- &action,
- &name,
- &id,
- &n);
- if (r < 2) {
+ /* Parse columns */
+ p = buffer;
+ r = unquote_many_words(&p, &action, &name, &id, &description, &home, NULL);
+ if (r < 0) {
log_error("[%s:%u] Syntax error.", fname, line);
- return -EIO;
+ return r;
+ }
+ if (r < 2) {
+ log_error("[%s:%u] Missing action and name columns.", fname, line);
+ return -EINVAL;
+ }
+ if (*p != 0) {
+ log_error("[%s:%u] Trailing garbage.", fname, line);
+ return -EINVAL;
}
+ /* Verify action */
if (strlen(action) != 1) {
log_error("[%s:%u] Unknown modifier '%s'", fname, line, action);
return -EINVAL;
@@ -1384,6 +1422,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
return -EBADMSG;
}
+ /* Verify name */
r = specifier_printf(name, specifier_table, NULL, &resolved_name);
if (r < 0) {
log_error("[%s:%u] Failed to replace specifiers: %s", fname, line, name);
@@ -1395,11 +1434,20 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
return -EINVAL;
}
- if (n >= 0) {
- n += strspn(buffer+n, WHITESPACE);
+ /* Simplify remaining columns */
+ if (isempty(id) || streq(id, "-")) {
+ free(id);
+ id = NULL;
+ }
+
+ if (isempty(description) || streq(description, "-")) {
+ free(description);
+ description = NULL;
+ }
- if (STR_IN_SET(buffer + n, "", "-"))
- n = -1;
+ if (isempty(home) || streq(home, "-")) {
+ free(home);
+ home = NULL;
}
switch (action[0]) {
@@ -1408,13 +1456,19 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
_cleanup_free_ char *resolved_id = NULL;
char **l;
- r = hashmap_ensure_allocated(&members, string_hash_func, string_compare_func);
- if (r < 0)
- return log_oom();
-
/* Try to extend an existing member or group item */
- if (!id || streq(id, "-")) {
+ if (description) {
+ log_error("[%s:%u] Lines of type 'm' don't take a GECOS field.", fname, line);
+ return -EINVAL;
+ }
+
+ if (home) {
+ log_error("[%s:%u] Lines of type 'm' don't take a home directory field.", fname, line);
+ return -EINVAL;
+ }
+
+ if (!id) {
log_error("[%s:%u] Lines of type 'm' require a group name in the third field.", fname, line);
return -EINVAL;
}
@@ -1430,10 +1484,9 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
return -EINVAL;
}
- if (n >= 0) {
- log_error("[%s:%u] Lines of type 'm' don't take a GECOS field.", fname, line);
- return -EINVAL;
- }
+ r = hashmap_ensure_allocated(&members, string_hash_func, string_compare_func);
+ if (r < 0)
+ return log_oom();
l = hashmap_get(members, resolved_id);
if (l) {
@@ -1476,15 +1529,12 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
if (!i)
return log_oom();
- if (id && !streq(id, "-")) {
-
+ if (id) {
if (path_is_absolute(id)) {
- i->uid_path = strdup(id);
- if (!i->uid_path)
- return log_oom();
+ i->uid_path = id;
+ id = NULL;
path_kill_slashes(i->uid_path);
-
} else {
r = parse_uid(id, &i->uid);
if (r < 0) {
@@ -1496,40 +1546,53 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
}
}
- if (n >= 0) {
- i->description = unquote(buffer+n, "\"");
- if (!i->description)
- return log_oom();
+ if (description) {
+ if (!valid_gecos(description)) {
+ log_error("[%s:%u] '%s' is not a valid GECOS field.", fname, line, description);
+ return -EINVAL;
+ }
+
+ i->description = description;
+ description = NULL;
+ }
- if (!valid_gecos(i->description)) {
- log_error("[%s:%u] '%s' is not a valid GECOS field.", fname, line, i->description);
+ if (home) {
+ if (!valid_home(home)) {
+ log_error("[%s:%u] '%s' is not a valid home directory field.", fname, line, home);
return -EINVAL;
}
+
+ i->home = home;
+ home = NULL;
}
h = users;
break;
case ADD_GROUP:
- r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func);
- if (r < 0)
- return log_oom();
- if (n >= 0) {
+ if (description) {
log_error("[%s:%u] Lines of type 'g' don't take a GECOS field.", fname, line);
return -EINVAL;
}
+ if (home) {
+ log_error("[%s:%u] Lines of type 'g' don't take a home directory field.", fname, line);
+ return -EINVAL;
+ }
+
+ r = hashmap_ensure_allocated(&groups, string_hash_func, string_compare_func);
+ if (r < 0)
+ return log_oom();
+
i = new0(Item, 1);
if (!i)
return log_oom();
- if (id && !streq(id, "-")) {
-
+ if (id) {
if (path_is_absolute(id)) {
- i->gid_path = strdup(id);
- if (!i->gid_path)
- return log_oom();
+ i->gid_path = id;
+ id = NULL;
path_kill_slashes(i->gid_path);
} else {
@@ -1543,7 +1606,6 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
}
}
-
h = groups;
break;
default:
diff --git a/src/test/test-util.c b/src/test/test-util.c
index e876248935..b74abac154 100644
--- a/src/test/test-util.c
+++ b/src/test/test-util.c
@@ -1101,6 +1101,113 @@ static void test_execute_directory(void) {
rm_rf_dangerous(tempdir, false, true, false);
}
+static void test_unquote_first_word(void) {
+ const char *p, *original;
+ char *t;
+
+ p = original = "foobar waldo";
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "foobar"));
+ free(t);
+ assert_se(p == original + 7);
+
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "waldo"));
+ free(t);
+ assert_se(p == original + 12);
+
+ assert_se(unquote_first_word(&p, &t) == 0);
+ assert_se(!t);
+ assert_se(p == original + 12);
+
+ p = original = "\"foobar\" \'waldo\'";
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "foobar"));
+ free(t);
+ assert_se(p == original + 9);
+
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "waldo"));
+ free(t);
+ assert_se(p == original + 16);
+
+ assert_se(unquote_first_word(&p, &t) == 0);
+ assert_se(!t);
+ assert_se(p == original + 16);
+
+ p = original = "\"";
+ assert_se(unquote_first_word(&p, &t) == -EINVAL);
+ assert_se(p == original + 1);
+
+ p = original = "\'";
+ assert_se(unquote_first_word(&p, &t) == -EINVAL);
+ assert_se(p == original + 1);
+
+ p = original = "yay\'foo\'bar";
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "yayfoobar"));
+ free(t);
+ assert_se(p == original + 11);
+
+ p = original = " foobar ";
+ assert_se(unquote_first_word(&p, &t) > 0);
+ assert_se(streq(t, "foobar"));
+ free(t);
+ assert_se(p == original + 12);
+}
+
+static void test_unquote_many_words(void) {
+ const char *p, *original;
+ char *a, *b, *c;
+
+ p = original = "foobar waldi piep";
+ assert_se(unquote_many_words(&p, &a, &b, &c, NULL) == 3);
+ assert_se(p == original + 17);
+ assert_se(streq_ptr(a, "foobar"));
+ assert_se(streq_ptr(b, "waldi"));
+ assert_se(streq_ptr(c, "piep"));
+ free(a);
+ free(b);
+ free(c);
+
+ p = original = "'foobar' wa\"ld\"i ";
+ assert_se(unquote_many_words(&p, &a, &b, &c, NULL) == 2);
+ assert_se(p == original + 19);
+ assert_se(streq_ptr(a, "foobar"));
+ assert_se(streq_ptr(b, "waldi"));
+ assert_se(streq_ptr(c, NULL));
+ free(a);
+ free(b);
+
+ p = original = "";
+ assert_se(unquote_many_words(&p, &a, &b, &c, NULL) == 0);
+ assert_se(p == original);
+ assert_se(streq_ptr(a, NULL));
+ assert_se(streq_ptr(b, NULL));
+ assert_se(streq_ptr(c, NULL));
+
+ p = original = " ";
+ assert_se(unquote_many_words(&p, &a, &b, &c, NULL) == 0);
+ assert_se(p == original+2);
+ assert_se(streq_ptr(a, NULL));
+ assert_se(streq_ptr(b, NULL));
+ assert_se(streq_ptr(c, NULL));
+
+ p = original = "foobar";
+ assert_se(unquote_many_words(&p, NULL) == 0);
+ assert_se(p == original);
+
+ p = original = "foobar waldi";
+ assert_se(unquote_many_words(&p, &a, NULL) == 1);
+ assert_se(p == original+7);
+ assert_se(streq_ptr(a, "foobar"));
+
+ p = original = " foobar ";
+ assert_se(unquote_many_words(&p, &a, NULL) == 1);
+ assert_se(p == original+15);
+ assert_se(streq_ptr(a, "foobar"));
+}
+
int main(int argc, char *argv[]) {
log_parse_environment();
log_open();
@@ -1168,6 +1275,8 @@ int main(int argc, char *argv[]) {
test_search_and_fopen_nulstr();
test_glob_exists();
test_execute_directory();
+ test_unquote_first_word();
+ test_unquote_many_words();
return 0;
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-10 04:41:36 +0000