X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fbasic%2Fuser-util.c;h=2ba5c8575f414cc57257ff192e94e5c9539a814e;hp=fbe9f2a969987f86b225bd3a170173c0698aa7d5;hb=2e59594b6e8f4814fd36d6a638cef31d6707e086;hpb=35eec258c4523c92fe985d764198b266ebc3881a

diff --git a/src/basic/user-util.c b/src/basic/user-util.c
index fbe9f2a96..2ba5c8575 100644
--- a/src/basic/user-util.c
+++ b/src/basic/user-util.c
@@ -485,3 +485,94 @@ int take_etc_passwd_lock(const char *root) {
         return fd;
 }
 #endif // 0
+
+bool valid_user_group_name(const char *u) {
+        const char *i;
+        long sz;
+
+        /* Checks if the specified name is a valid user/group name. */
+
+        if (isempty(u))
+                return false;
+
+        if (!(u[0] >= 'a' && u[0] <= 'z') &&
+            !(u[0] >= 'A' && u[0] <= 'Z') &&
+            u[0] != '_')
+                return false;
+
+        for (i = u+1; *i; i++) {
+                if (!(*i >= 'a' && *i <= 'z') &&
+                    !(*i >= 'A' && *i <= 'Z') &&
+                    !(*i >= '0' && *i <= '9') &&
+                    *i != '_' &&
+                    *i != '-')
+                        return false;
+        }
+
+        sz = sysconf(_SC_LOGIN_NAME_MAX);
+        assert_se(sz > 0);
+
+        if ((size_t) (i-u) > (size_t) sz)
+                return false;
+
+        if ((size_t) (i-u) > UT_NAMESIZE - 1)
+                return false;
+
+        return true;
+}
+
+bool valid_user_group_name_or_id(const char *u) {
+
+        /* Similar as above, but is also fine with numeric UID/GID specifications, as long as they are in the right
+         * range, and not the invalid user ids. */
+
+        if (isempty(u))
+                return false;
+
+        if (valid_user_group_name(u))
+                return true;
+
+        return parse_uid(u, NULL) >= 0;
+}
+
+bool valid_gecos(const char *d) {
+
+        if (!d)
+                return false;
+
+        if (!utf8_is_valid(d))
+                return false;
+
+        if (string_has_cc(d, NULL))
+                return false;
+
+        /* Colons are used as field separators, and hence not OK */
+        if (strchr(d, ':'))
+                return false;
+
+        return true;
+}
+
+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;
+}