1 mike  1.1.2.1 /*
  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 mike  1.1.2.1 // 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               #include "Defines.h"
 40               #include "Fatal.h"
 41               #include "Path.h"
 42               #include "File.h"
 43 mike  1.1.2.1 #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 mike  1.1.2.4     const char* path,

 60 mike  1.1.2.1     int uid,
 61                   int gid,

 62 mike  1.1.2.3     int sock,
 63                   const char* repositoryDir)

 64 mike  1.1.2.1 {
 65                   char sockStr[EXECUTOR_BUFFER_SIZE];
 66                   char username[EXECUTOR_BUFFER_SIZE];
 67                   char** execArgv;
 68               
 69                   /* Build argument list, adding "-x <sock>" option if sock non-negative. */
 70               

 71 mike  1.1.2.2     execArgv = (char**)malloc(sizeof(char*) * (argc + 3));
 72                   memcpy(execArgv + 3, argv + 1, sizeof(char*) * argc);

 73 mike  1.1.2.1 
 74                   sprintf(sockStr, "%d", sock);
 75               
 76                   execArgv[0] = CIMSERVERMAIN;

 77 mike  1.1.2.2     execArgv[1] = "-x";
 78                   execArgv[2] = strdup(sockStr);

 79 mike  1.1.2.1 
 80                   /* Check whether repository directory exists. */
 81               
 82                   if (AccessDir(repositoryDir) != 0)
 83                       Fatal(FL, 
 84                           "failed to access repository directory: %s", repositoryDir);
 85               
 86                   /* 
 87                    * Change ownership of Pegasus repository directory (it should be owned
 88                    * by same user that owns CIMSERVERMAIN).
 89                    */
 90               
 91                   ChangeDirOwnerRecursive(repositoryDir, uid, gid);
 92               
 93                   Log(LL_TRACE, "Pegasus repositoryDir is \"%s\"", repositoryDir);
 94               
 95                   /*
 96                    * Downgrade privileges by setting the UID and GID of this process. Use
 97                    * the owner of the CIMSERVERMAIN program obtained above.
 98                    */
 99               
100 mike  1.1.2.1     if (uid == 0 || gid == 0)
101                   {
102                       Fatal(FL, "root may not own %s since the program is run as owner",
103                           path);
104                   }
105               
106                   if (setgid(gid) != 0)
107                   {
108                       Fatal(FL, "Failed to set gid to %d", gid);
109                   }
110               
111                   if (setuid(uid) != 0)
112                   {
113                       Fatal(FL, "Failed to set uid to %d", uid);
114                   }
115               
116                   if ((int)getuid() != uid || 
117                       (int)geteuid() != uid || 
118                       (int)getgid() != gid || 
119                       (int)getegid() != gid)
120                   {
121 mike  1.1.2.1         Fatal(FL, "setuid/setgid verification failed\n");
122                   }
123               
124                   /* Log user info. */
125               
126                   if (GetUserName(uid, username) != 0)
127                       Fatal(FL, "cannot resolve user from uid=%d", uid);
128               
129                   Log(LL_TRACE, "%s running as %s (uid=%d, gid=%d)", CIMSERVERMAIN, 
130                       username, uid, gid);
131               
132                   /*

133 mike  1.1.2.4      * Precheck that cimxml.socket is owned by CIMSERVERMAIN process. If 
134                    * not, then the bind would fail in the CIMSERVERMAIN process much 

135 mike  1.1.2.1      * later and the cause of the error would be difficult to determine.
136                    */
137               
138                   /* Flawfinder: ignore */
139                   if (access(PEGASUS_LOCAL_DOMAIN_SOCKET_PATH, F_OK) == 0)
140                   {
141                       struct stat st;
142               
143                       if (stat(PEGASUS_LOCAL_DOMAIN_SOCKET_PATH, &st) != 0 ||
144                           (int)st.st_uid != uid || 
145                           (int)st.st_gid != gid)
146                       {

147 mike  1.1.2.4             Fatal(FL, "%s process cannot stat or does not own %s",
148                               CIMSERVERMAIN, PEGASUS_LOCAL_DOMAIN_SOCKET_PATH);

149 mike  1.1.2.1         }
150                   }
151               
152                   /* Exec child process. */
153               
154                   /* Flawfinder: ignore */
155                   if (execv(path, execArgv) != 0)
156                       Fatal(FL, "failed to exec %s", path);
157               
158                   exit(0);
159               }