1 kumpf 1.2 /*
  2           //%2006////////////////////////////////////////////////////////////////////////
  3           //
  4           // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
  5           // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
  6           // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
  7           // IBM Corp.; EMC Corporation, The Open Group.
  8           // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
  9           // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
 10           // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 11           // EMC Corporation; VERITAS Software Corporation; The Open Group.
 12           // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
 13           // EMC Corporation; Symantec Corporation; The Open Group.
 14           //
 15           // Permission is hereby granted, free of charge, to any person obtaining a copy
 16           // of this software and associated documentation files (the "Software"), to
 17           // deal in the Software without restriction, including without limitation the
 18           // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 19           // sell copies of the Software, and to permit persons to whom the Software is
 20           // furnished to do so, subject to the following conditions:
 21           // 
 22 kumpf 1.2 // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
 23           // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
 24           // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 25           // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 26           // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 27           // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 28           // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 29           // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 30           //
 31           //%/////////////////////////////////////////////////////////////////////////////
 32           */
 33           #include <sys/types.h>
 34           #include <sys/stat.h>
 35           #include <unistd.h>
 36           #include <stdlib.h>
 37           #include <string.h>
 38           #include <stdio.h>

 39 kumpf 1.3 #include <grp.h>

 40 kumpf 1.2 #include "Defines.h"
 41           #include "Fatal.h"
 42           #include "Path.h"
 43           #include "Log.h"
 44           #include "User.h"
 45           
 46           /*
 47           **==============================================================================
 48           **
 49           ** Child
 50           **
 51           **     The child process.
 52           **
 53           **==============================================================================
 54           */
 55           
 56           void Child(
 57               int argc,
 58               char** argv,
 59               const char* path,

 60 kumpf 1.3     const char* userName,

 61 kumpf 1.2     int uid,
 62               int gid,
 63               int sock)
 64           {
 65               char sockStr[EXECUTOR_BUFFER_SIZE];
 66               char username[EXECUTOR_BUFFER_SIZE];
 67               char** execArgv;
 68           
 69               /* Build argument list, adding "--executor-socket <sock>" option if
 70                * sock non-negative.
 71                */
 72           
 73               execArgv = (char**)malloc(sizeof(char*) * (argc + 3));
 74               memcpy(execArgv + 3, argv + 1, sizeof(char*) * argc);
 75           
 76               sprintf(sockStr, "%d", sock);
 77           
 78               execArgv[0] = CIMSERVERMAIN;
 79               execArgv[1] = "--executor-socket";
 80               execArgv[2] = strdup(sockStr);
 81           
 82 kumpf 1.2     /*
 83                * Downgrade privileges by setting the UID and GID of this process. Use
 84                * the owner of the CIMSERVERMAIN program obtained above.
 85                */
 86           
 87               if (uid == 0 || gid == 0)
 88               {
 89                   Fatal(FL, "root may not own %s since the program is run as owner",
 90                       path);
 91               }
 92           
 93               if (setgid(gid) != 0)
 94               {
 95                   Fatal(FL, "Failed to set gid to %d", gid);
 96               }
 97           

 98 kumpf 1.3     if (initgroups(userName, gid) != 0)
 99               {
100                   Fatal(FL, "Failed to initialize groups for user %s", userName);
101               }
102           

103 kumpf 1.2     if (setuid(uid) != 0)
104               {
105                   Fatal(FL, "Failed to set uid to %d", uid);
106               }
107           
108               if ((int)getuid() != uid ||
109                   (int)geteuid() != uid ||
110                   (int)getgid() != gid ||
111                   (int)getegid() != gid)
112               {
113                   Fatal(FL, "setuid/setgid verification failed\n");
114               }
115           
116               /* Log user info. */
117           
118               if (GetUserName(uid, username) != 0)
119                   Fatal(FL, "cannot resolve user from uid=%d", uid);
120           
121               Log(LL_TRACE, "%s running as %s (uid=%d, gid=%d)", CIMSERVERMAIN,
122                   username, uid, gid);
123           
124 kumpf 1.2     /*
125                * Precheck that cimxml.socket is owned by CIMSERVERMAIN process. If
126                * not, then the bind would fail in the CIMSERVERMAIN process much
127                * later and the cause of the error would be difficult to determine.
128                */
129           
130               /* Flawfinder: ignore */
131               if (access(PEGASUS_LOCAL_DOMAIN_SOCKET_PATH, F_OK) == 0)
132               {
133                   struct stat st;
134           
135                   if (stat(PEGASUS_LOCAL_DOMAIN_SOCKET_PATH, &st) != 0 ||
136                       (int)st.st_uid != uid ||
137                       (int)st.st_gid != gid)
138                   {
139                       Fatal(FL, "%s process cannot stat or does not own %s",
140                           CIMSERVERMAIN, PEGASUS_LOCAL_DOMAIN_SOCKET_PATH);
141                   }
142               }
143           
144               /* Exec child process. */
145 kumpf 1.2 
146               /* Flawfinder: ignore */
147               if (execv(path, execArgv) != 0)
148                   Fatal(FL, "failed to exec %s", path);
149           
150               exit(0);
151           }