initial

.gitignore

@@ -0,0 +1,2 @@
+bin
+.vscode

Makefile

@@ -0,0 +1,20 @@
+CC=gcc
+CFLAGS=-Wall
+SOURCES=src/sudo.c
+TARGET=bin/sudo
+
+default: all
+
+all: build
+
+build:
+	@if [ ! -d bin ]; then \
+		mkdir bin; \
+	fi
+	$(CC) -o $(TARGET) $(SOURCES) $(CFLAGS)
+	sudo chown -v root:staff $(TARGET)
+	sudo chmod 4755 $(TARGET)
+
+clean:
+	rm -v $(TARGET)
+	

src/sudo.c

@@ -0,0 +1,34 @@
+#include <errno.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+// #include <sys/types.h>
+#include <unistd.h>
+
+void die(char *argv0, char *obj, char *msg) {
+    if (msg == NULL) msg = strerror(errno);
+    fprintf(stderr, "%s: %s: %s\n", argv0, obj, msg);
+    exit(127);
+}
+int main(int argc, char *argv[]) {
+    uid_t uid;
+    gid_t gid;
+    // char *endp;
+    /* Command line parsing */
+    if (argc <= 1) {
+        fprintf(stderr, "Usage: %s COMMAND [ARG...]\n",
+                argv[0]==NULL ? "sugexec" : argv[0]);
+        exit(127);
+    }
+    uid = 0;//strtoul(argv[1], &endp, 0);
+    // if (*endp) die(argv[0], argv[1], "Bad uid");
+    gid = 0;//strtoul(argv[2], &endp, 0);
+    // if (*endp) die(argv[0], argv[2], "Bad gid");
+    /* Drop to specified user and group */
+    if (setgid(gid)) die(argv[0], "setgid", NULL);
+    if (setgroups(0, NULL)) die(argv[0], "setgroups", NULL);
+    if (setuid(uid)) die(argv[0], "setuid", NULL);
+    /* Execute the command */
+    execvp(argv[1], argv+1);
+    die(argv[0], argv[1], NULL);
+}