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repo: wargame
action: commit
revision:
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revision_from: 9268789dedff01bbe7bbaed3248977e4639bdfe8:
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commit 9268789dedff01bbe7bbaed3248977e4639bdfe8
Author: epoch <epoch@thebackupbox.net>
Date:   Tue Mar 28 21:47:34 2023 +0000

    forced useradd to use the uid I want it to use, compressed the name[] assignment. added comments for each header.

diff --git a/tools/newuser.c b/tools/newuser.c

--- a/tools/newuser.c
+++ b/tools/newuser.c
@@ -1,20 +1,19 @@
-#include <stdio.h>
-#include <ctype.h> //isalpha I think
+#include <ctype.h> //isalpha
 #include <unistd.h> //execv
+#include <grp.h> //getpwuid
+#include <pwd.h> //getgrgid
+#include <stdio.h> // sprintf

 #define DEFAULT_PASSWORD_HASH "$6$aUL4XtcGCPT6Oj/x$sa4MUe2TC1rO3XnkzFcS4OjoTrHXE9zBp6N5vzaJcOLaTMjIZTUKAzsKEi49Q7gbK4CZm869aIkYJxISsQjp51"

 int main(int argc,char *argv[]) {
 	int i;
-	char *name[6];
-	for(i=0;argv[1][i];i++) {
-		if(!isalpha(argv[1][i])) return 1;//fuck off with your weird usernames
-	}
-	name[0]="/usr/sbin/useradd";
-	name[1]="-m";
-	name[2]="-p";
-	name[3]=DEFAULT_PASSWORD_HASH;
-	name[4]=argv[1];
-	name[5]=0;
+	uid_t uid;
+	char struid[128];//way more than enough for any unsigned integer representation... right?
+	if(argc < 2) return 2;
+	for(i=0;argv[1][i];i++) if(!isalpha(argv[1][i])) return 1;
+	for(uid=1000;getpwuid(uid) || getgrgid(uid);uid++); // find first open uid and gid pair that are the same
+	sprintf(struid,"%u",uid);
+	char *name[] = { "/usr/sbin/useradd", "-m", "-u", struid, "-p", DEFAULT_PASSWORD_HASH, argv[1], 0 };
 	execv(name[0],name);
 }

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