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fix: complete. Some filesystem not support SUID

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This commit is contained in:
TING-JUN WANG 2024-06-25 00:49:47 +08:00
parent fe27808a65
commit 52a850159d
2 changed files with 26 additions and 7 deletions
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14
tool/Makefile
View File

@ -1,12 +1,14 @@
CC = gcc CC = gcc
CFLAGS = -Wall -Wextra -std=c99 CFLAGS = -Wall -Wextra -std=c99
all: setup_uid all: setup-uid
setup_uid: setup_uid.c setup-uid: setup_uid.c
$(CC) $(CFLAGS) -o setup_uid setup_uid.c $(CC) $(CFLAGS) -o setup-uid setup_uid.c
sudo chown root:root setup_uid sudo chown root:root setup-uid
sudo chmod +s setup_uid sudo cp ./setup-uid /usr/bin
sudo chmod +s /usr/bin/setup-uid
clean: clean:
sudo rm setup_uid sudo rm setup-uid
sudo rm /usr/bin/setup-uid

19
tool/setup_uid.c
View File

@ -1,8 +1,10 @@
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <stdbool.h> #include <stdbool.h>
#include <unistd.h> #include <unistd.h>
#include <string.h> #include <string.h>
#include <sys/types.h>
bool check_user(char *filename, char *username, unsigned long *new_start) { bool check_user(char *filename, char *username, unsigned long *new_start) {
/* /*
@ -57,7 +59,7 @@ void insert_user(char *filename, char *username, unsigned long start) {
exit(1); exit(1);
} }
char new_line[100]; char new_line[100];
sprintf(new_line, "%s:%lu:%d\n", username, start, 65535); sprintf(new_line, "%s:%lu:%d\n", username, start, 65536);
fputs(new_line, fp); fputs(new_line, fp);
fclose(fp); fclose(fp);
printf("[SUCCESS] %s has been inserted in %s\n", username, filename); printf("[SUCCESS] %s has been inserted in %s\n", username, filename);
@ -65,8 +67,23 @@ void insert_user(char *filename, char *username, unsigned long start) {
int main() { int main() {
int ret;
char *username = getlogin(); char *username = getlogin();
uid_t ruid, euid, suid;
getresuid(&ruid, &euid, &suid);
printf("ruid=%d, euid=%d, suid=%d\n", ruid, euid, suid);
ret = setuid(0);
printf("ret=%d\n", ret);
if (ret != 0) {
perror("Error:");
exit(1);
}
getresuid(&ruid, &euid, &suid);
printf("ruid=%d, euid=%d, suid=%d\n", ruid, euid, suid);
char filenames[2][20] = { char filenames[2][20] = {
"/etc/subuid", "/etc/subgid" "/etc/subuid", "/etc/subgid"
}; };