u[0] != '_')
return false;
- for (i = u+1; *i; i++)
- if (!((*i >= 'a' && *i <= 'z') ||
- (*i >= 'A' && *i <= 'Z') ||
- (*i >= '0' && *i <= '9') ||
- IN_SET(*i, '_', '-') ||
- (!strict && *i == '.')))
- return false;
+ bool warned = false;
+
+ for (i = u+1; *i; i++) {
+ if (((*i >= 'a' && *i <= 'z') ||
+ (*i >= 'A' && *i <= 'Z') ||
+ (*i >= '0' && *i <= '9') ||
+ IN_SET(*i, '_', '-')))
+ continue;
+
+ if (*i == '.' && !strict) {
+ if (!warned) {
+ log_warning("Bad user or group name \"%s\", accepting for compatibility.", u);
+ warned = true;
+ }
+
+ continue;
+ }
+
+ return false;
+ }
sz = sysconf(_SC_LOGIN_NAME_MAX);
assert_se(sz > 0);