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238 lines
6.3 KiB
238 lines
6.3 KiB
// Copyright 2007-2010 Mir Calculate Ltd. http://www.calculate-linux.org
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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// for password
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#include <sys/types.h>
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#include <pwd.h>
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// for strcpy strlen
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#include <string.h>
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// for keystore kernel
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#include <keyutils.h>
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// for statistics file
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#include <fcntl.h>
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#include <sys/stat.h>
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int main( int argc, const char* argv[] )
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{
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// user id and gid
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uid_t uid, gid;
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int ret;
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int rez1,rez2;
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void *buffer;
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if (argc==1)
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{
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// get user id and gid
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uid = getuid();
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gid = getgid();
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// set user id and gid for the process
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rez1 = setgid(gid);
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rez2 = setuid(uid);
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if (rez1==-1||rez2==-1)
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{
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printf ("exec not SUID root\n");
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exit(EXIT_FAILURE);
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};
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// find user key in keystore
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ret = request_key("user", "tmp", NULL, 0);
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if (ret < 0)
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{
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printf ("id_key not found\n");
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exit(EXIT_FAILURE);
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};
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// get user key
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int retf;
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retf = keyctl_read_alloc(ret, &buffer);
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if (retf < 0)
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{
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printf("error keyctl_read_alloc\n");
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exit(EXIT_FAILURE);
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};
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printf ("%s", (char*) buffer);
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buffer = "XXXXXXXX";
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key_serial_t dest;
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// get id user key
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dest = KEY_SPEC_USER_SESSION_KEYRING;
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// write key in user space
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ret = add_key("user", "tmp", buffer, strlen(buffer), dest);
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exit(EXIT_SUCCESS);
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};
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if (argc!=3)
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{
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printf("Error: needed two argument\n");
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exit(EXIT_FAILURE);
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}
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// get user id and gid
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uid = getuid();
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gid = getgid();
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char * prog_name[10];
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char * prog_path[10];
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char * prog_sring[10];
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int count_prog =10;
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// identifiers and paths to programs
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prog_name[0] = "rdesktop";
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prog_path[0] = "/usr/bin/rdesktop";
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prog_sring[0] = NULL;
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prog_name[1] = "rdesktop1";
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prog_path[1] = "/usr/bin/rdesktop";
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prog_sring[1] = "/usr/bin/kstart --window=.* --desktop=1";
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prog_name[2] = "rdesktop2";
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prog_path[2] = "/usr/bin/rdesktop";
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prog_sring[2] = "/usr/bin/kstart --window=.* --desktop=2";
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prog_name[3] = "rdesktop3";
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prog_path[3] = "/usr/bin/rdesktop";
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prog_sring[3] = "/usr/bin/kstart --window=.* --desktop=3";
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prog_name[4] = "rdesktop4";
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prog_path[4] = "/usr/bin/rdesktop";
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prog_sring[4] = "/usr/bin/kstart --window=.* --desktop=4";
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prog_name[5] = "rdesktop5";
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prog_path[5] = "/usr/bin/rdesktop";
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prog_sring[5] = "/usr/bin/kstart --window=.* --desktop=5";
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prog_name[6] = "rdesktop6";
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prog_path[6] = "/usr/bin/rdesktop";
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prog_sring[6] = "/usr/bin/kstart --window=.* --desktop=6";
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prog_name[7] = "rdesktop7";
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prog_path[7] = "/usr/bin/rdesktop";
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prog_sring[7] = "/usr/bin/kstart --window=.* --desktop=7";
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prog_name[8] = "rdesktop8";
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prog_path[8] = "/usr/bin/rdesktop";
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prog_sring[8] = "/usr/bin/kstart --window=.* --desktop=8";
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prog_name[9] = "rdesktop9";
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prog_path[9] = "/usr/bin/rdesktop";
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prog_sring[9] = "/usr/bin/kstart --window=.* --desktop=9";
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// path to the running program
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char * str_prog = NULL;
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// if kstart
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char * str_prog_ks = NULL;
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int i;
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for (i=0;i<count_prog;i++)
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{
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if (strcmp(prog_name[i],argv[1])==0)
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{
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str_prog = prog_path[i];
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str_prog_ks = prog_sring[i];
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break;
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};
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};
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if (str_prog == NULL)
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{
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printf ("False program\n");
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exit(EXIT_FAILURE);
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};
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struct stat bufS;
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int res;
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int fd;
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// file permissions for check
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int mode_file = 33261;
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fd = open(str_prog, O_RDONLY);
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res = fstat(fd,&bufS);
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if (res==0)
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{
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close(fd);
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}else
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{
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printf("No open file %s\n",str_prog);
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exit(EXIT_FAILURE);
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};
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// comparison of permissions and owner of the executable file with the sample
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if (bufS.st_mode == mode_file && bufS.st_uid == 0 && bufS.st_gid == 0)
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{
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struct passwd *pwd = getpwuid (uid);
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if (pwd == NULL)
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{
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exit(EXIT_FAILURE);
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};
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// get user name
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char *login;
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login = (char*) malloc (strlen(pwd->pw_name)+1);
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strcpy (login,pwd->pw_name);
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// set permissions root
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rez1 = setgid(0);
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rez2 = setuid(0);
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if (rez1==-1||rez2==-1)
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{
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printf ("Exec not SUID root\n");
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exit(EXIT_FAILURE);
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};
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int ret;
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// find user key in keystore
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ret = request_key("user", login, NULL, 0);
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if (ret < 0)
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{
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printf ("id_key not found\n");
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exit(EXIT_FAILURE);
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};
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// get user key
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ret = keyctl_read_alloc(ret, &buffer);
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if (ret < 0)
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{
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printf("error keyctl_read_alloc\n");
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exit(EXIT_FAILURE);
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}
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// set user id and gid for the process
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rez1 = setgid(gid);
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rez2 = setuid(uid);
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if (rez1==-1||rez2==-1)
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{
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printf ("exec not SUID root\n");
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exit(EXIT_FAILURE);
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};
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key_serial_t dest;
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// get id user key
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dest = KEY_SPEC_USER_SESSION_KEYRING;
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// write key in user space
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ret = add_key("user", "tmp", buffer, strlen(buffer), dest);
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// allocate memory and create a line running
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char *buff;
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if (str_prog_ks == NULL)
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{
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char *com = "keyexec | %s %s";
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buff = (char*) malloc (strlen(com)+strlen(str_prog)+strlen(argv[2])+1);
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sprintf (buff, com, str_prog, argv[2]);
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}
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else
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{
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char *com = "%s keyexec | %s %s";
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buff = (char*) malloc (strlen(str_prog_ks)+strlen(com)+strlen(buffer)+strlen(str_prog)+strlen(argv[2])+1);
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sprintf (buff, com, str_prog_ks, str_prog, argv[2]);
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};
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// running program
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system(buff);
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free(login);
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free (buff);
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exit(EXIT_SUCCESS);
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};
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printf ("Executed file %s not valid\n",str_prog);
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exit(EXIT_FAILURE);
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}
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