AuthorizationExecuteWithPrivileges()作为root错误

Question

我是可可的初学者......

我只想在我的Cocoa App中启动Apache和其他进程.

这是我的代码:

    OSStatus myStatus;
    AuthorizationFlags myFlags = kAuthorizationFlagDefaults;
    AuthorizationRef myAuthorizationRef;
    FILE *pipe = NULL;
    myStatus = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment, myFlags, &myAuthorizationRef);
    AuthorizationItem myItems = {kAuthorizationRightExecute, 0, NULL, 0};
    AuthorizationRights myRights = {1, &myItems};
    myFlags = kAuthorizationFlagDefaults | 
    kAuthorizationFlagInteractionAllowed |
    kAuthorizationFlagPreAuthorize |
    kAuthorizationFlagExtendRights;
    myStatus = AuthorizationCopyPrivilegedReference (&myAuthorizationRef,kAuthorizationFlagDefaults);
    myStatus = AuthorizationCopyRights (myAuthorizationRef,&myRights, NULL, myFlags, NULL ); 

    char *tool = "/usr/sbin/apachectl";
    char *args[] = { "start",NULL} ;    

    myStatus = AuthorizationExecuteWithPrivileges(myAuthorizationRef, tool, kAuthorizationFlagDefaults, args, &pipe);
    char c[100];
    int n=fread(c,1,100,pipe);
    c[n] = '\0';
    NSLog(@"%s\n",c);

theResult: 这个操作需要root
当我运行'whoami'时,我是' root'但是当我运行getuid()时,我' 501' ......

我尝试使用setuid(0); 但它没有设置!!
你能帮助我吗？
谢谢

Answer 1

我有同样的问题.AuthorizationExecuteWithPrivileges允许您将权限升级到root,但不会自动执行(我想保留用户会话或其他任何内容).

我最终创建了一个通过AuthorizationExecuteWithPrivileges运行的通用可执行文件,然后该可执行文件将setuid为root,然后执行您实际想要以root身份运行的进程.

这是setuid包装器可执行文件的源代码:

#include <stdio.h>

int main(int argc, char** argv) {
  if (argc < 2) {
    printf("not enough arguments\n");
    return -1;
  }
  if (0 != setuid(0)) {
    printf("setuid failed.\n");
    return -3;
  }
  int i;
  char** argvz = (char**)malloc(sizeof(char*) * (argc - 1));
  for (i = 1; i < argc; i++) {
    argvz[i - 1] = argv[i];
  }

  execv(argv[1], argvz);
  printf("execv returned?\n");
  return -2;
}

然后,基本上运行(通过AuthorizationExecuteWithPrivileges调用它)为:

setuid my-program-to-run and arguments to pass

它将以root身份setuid,然后使用给定的args运行有问题的程序.

请注意,您必须从AuthorizationExecuteWithPrivileges调用setuid因为只有AuthorizationExecuteWithPrivileges创建的pid才具有升级的权限(并且setuid将执行并用您自己的进程替换该进程).