Squash commits for public release

userland/utilities/sudo/BUILD.gn

@@ -0,0 +1,8 @@
+import("//build/userland/TEMPLATE.gni")
+
+xOS_executable("sudo") {
+  install_path = "bin/"
+  sources = [ "main.c" ]
+  configs = [ "//build/userland:userland_flags" ]
+  deplibs = [ "libc" ]
+}

userland/utilities/sudo/main.c

@@ -0,0 +1,50 @@
+#include <fcntl.h>
+#include <pwd.h>
+#include <shadow.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+char pswd[64];
+
+int auth(char* uname)
+{
+    spwd_t* spwd;
+    spwd = getspnam(uname);
+    if (spwd == NULL) {
+        return -1;
+    }
+
+    printf("Password: ");
+    fflush(stdout);
+    scanf("%s", pswd);
+    int res = strcmp(pswd, spwd->sp_pwdp);
+    endspent();
+    return res;
+}
+
+int main(int argc, char** argv)
+{
+    char* envp[] = { "PATH=/bin:/usr/bin", NULL };
+    if (auth("root") != 0) {
+        printf("Incorrect password\n");
+        return -1;
+    }
+
+    // Sign as root
+    passwd_t* pwd = getpwnam("root");
+    if (pwd == NULL) {
+        printf("unable to retrieve user info");
+        return -1;
+    }
+
+    if (setuid(pwd->pw_uid) != 0) {
+        printf("setuid failure");
+        return -1;
+    }
+
+    execvpe(argv[1], &argv[1], envp);
+    return 0;
+}