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  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 17:28:47 UTC
  • mto: This revision was merged to the branch mainline in revision 412.
  • Revision ID: teddy@recompile.se-20241117172847-3bon1o16owybrmoo
mandos: Make configured network socket non-inheritable

If we are passed a pre-created created network socket as a file
descriptor, we should make it non-inheritable to checkers and other
subprocesses.

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Lines of Context:
plugin-runner.c
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/*
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 * Mandos plugin runner - Run Mandos plugins
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 *
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 * Copyright © 2008-2018 Teddy Hogeborn
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 * Copyright © 2008-2018 Björn Påhlsson
 
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 * Copyright © 2008-2022 Teddy Hogeborn
 
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 * Copyright © 2008-2022 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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 * Contact the authors at <mandos@recompile.se>.
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 */
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25
 
26
 
#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY(), getline(),
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                                   O_CLOEXEC, pipe2() */
 
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#define _GNU_SOURCE             /* strchrnul(), TEMP_FAILURE_RETRY(),
 
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                                   getline(), asprintf(), O_CLOEXEC,
 
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                                   scandirat(), pipe2() */
 
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#include <argp.h>               /* argp_program_version,
 
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                                   argp_program_bug_address,
 
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                                   struct argp_option,
 
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                                   struct argp_state, argp_error(),
 
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                                   ARGP_NO_EXIT, argp_state_help,
 
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                                   ARGP_HELP_STD_HELP,
 
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                                   ARGP_HELP_USAGE, ARGP_HELP_EXIT_OK,
 
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                                   ARGP_KEY_ARG, ARGP_ERR_UNKNOWN,
 
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                                   struct argp, argp_parse(),
 
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                                   ARGP_IN_ORDER, ARGP_NO_HELP */
 
39
#include <stdbool.h>            /* bool, false, true */
 
40
#include <sys/types.h>          /* pid_t, sig_atomic_t, uid_t, gid_t,
 
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                                   getuid(), setgid(), setuid() */
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#include <stddef.h>             /* size_t, NULL */
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#include <stdlib.h>             /* malloc(), exit(), EXIT_SUCCESS,
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                                   realloc() */
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#include <stdbool.h>            /* bool, true, false */
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#include <stdio.h>              /* fileno(), fprintf(),
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                                   stderr, STDOUT_FILENO, fclose() */
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#include <sys/types.h>          /* fstat(), struct stat, waitpid(),
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                                   WIFEXITED(), WEXITSTATUS(), wait(),
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                                   pid_t, uid_t, gid_t, getuid(),
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                                   getgid() */
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#include <sys/select.h>         /* fd_set, select(), FD_ZERO(),
39
 
                                   FD_SET(), FD_ISSET(), FD_CLR */
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#include <sys/wait.h>           /* wait(), waitpid(), WIFEXITED(),
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                                   WEXITSTATUS(), WTERMSIG() */
42
 
#include <sys/stat.h>           /* struct stat, fstat(), S_ISREG() */
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#include <iso646.h>             /* and, or, not */
44
 
#include <dirent.h>             /* struct dirent, scandirat() */
45
 
#include <unistd.h>             /* fcntl(), F_GETFD, F_SETFD,
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                                   FD_CLOEXEC, write(), STDOUT_FILENO,
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                                   struct stat, fstat(), close(),
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                                   setgid(), setuid(), S_ISREG(),
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                                   faccessat() pipe2(), fork(),
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                                   _exit(), dup2(), fexecve(), read()
51
 
                                */
 
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#include <iso646.h>             /* or, and, not */
 
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#include <string.h>             /* strcmp(), strdup(), strchrnul(),
 
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                                   strncmp(), strlen(), strcpy(),
 
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                                   strsep(), strchr(), strsignal() */
 
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#include <stdlib.h>             /* malloc(), free(), reallocarray(),
 
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                                   realloc(), EXIT_SUCCESS */
 
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#include <errno.h>              /* errno, EINTR, ENOMEM, ECHILD,
 
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                                   error_t, EINVAL, EMFILE, ENFILE,
 
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                                   ENOENT, ESRCH */
 
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#include <stdint.h>             /* SIZE_MAX */
 
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#define _GNU_SOURCE             /* strchrnul(), TEMP_FAILURE_RETRY(),
 
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                                   getline(), asprintf(), O_CLOEXEC,
 
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                                   scandirat(), pipe2() */
 
56
#include <unistd.h>             /* TEMP_FAILURE_RETRY(), ssize_t,
 
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                                   write(), STDOUT_FILENO, uid_t,
 
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                                   gid_t, getuid(), fchown(), close(),
 
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                                   symlink(), setgid(), setuid(),
 
60
                                   faccessat(), X_OK, pipe(), pipe2(),
 
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                                   fork(), _exit(), dup2(), fexecve(),
 
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                                   read(), getpass() */
52
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#include <fcntl.h>              /* fcntl(), F_GETFD, F_SETFD,
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                                   FD_CLOEXEC, openat(), scandirat(),
54
 
                                   pipe2() */
55
 
#include <string.h>             /* strsep, strlen(), strsignal(),
56
 
                                   strcmp(), strncmp() */
57
 
#include <errno.h>              /* errno */
58
 
#include <argp.h>               /* struct argp_option, struct
59
 
                                   argp_state, struct argp,
60
 
                                   argp_parse(), ARGP_ERR_UNKNOWN,
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                                   ARGP_KEY_END, ARGP_KEY_ARG,
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                                   error_t */
63
 
#include <signal.h>             /* struct sigaction, sigemptyset(),
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                                   sigaddset(), sigaction(),
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                                   sigprocmask(), SIG_BLOCK, SIGCHLD,
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                                   SIG_UNBLOCK, kill(), sig_atomic_t
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                                */
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#include <errno.h>              /* errno, EBADF */
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#include <inttypes.h>           /* intmax_t, PRIdMAX, strtoimax() */
 
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                                   FD_CLOEXEC, open(), O_RDONLY,
 
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                                   O_CLOEXEC, openat() */
 
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#include <sys/wait.h>           /* waitpid(), WNOHANG, WIFEXITED(),
 
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                                   WEXITSTATUS(), WIFSIGNALED(),
 
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                                   WTERMSIG(), wait() */
 
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#include <error.h>              /* error() */
 
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#include <stdio.h>              /* FILE, fprintf(), fopen(),
 
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                                   getline(), fclose(), EOF,
 
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                                   asprintf(), stderr */
 
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#include <dirent.h>             /* struct dirent, scandirat(),
 
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                                   alphasort() */
 
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#include <sys/stat.h>           /* struct stat, fstat(), S_ISDIR(),
 
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                                   lstat(), S_ISREG() */
 
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#include <sys/select.h>         /* fd_set, FD_ZERO(), FD_SETSIZE,
 
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                                   FD_SET(), select(), FD_CLR(),
 
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                                   FD_ISSET() */
 
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#include <signal.h>             /* struct sigaction, SA_NOCLDSTOP,
 
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                                   sigemptyset(), sigaddset(),
 
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                                   SIGCHLD, sigprocmask(), SIG_BLOCK,
 
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                                   SIG_UNBLOCK, kill(), SIGTERM */
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#include <sysexits.h>           /* EX_OSERR, EX_USAGE, EX_IOERR,
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                                   EX_CONFIG, EX_UNAVAILABLE, EX_OK */
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#include <errno.h>              /* errno */
73
 
#include <error.h>              /* error() */
74
 
#include <fnmatch.h>            /* fnmatch() */
 
86
#include <inttypes.h>           /* intmax_t, strtoimax(), PRIdMAX */
 
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#include <fnmatch.h>            /* fnmatch(), FNM_FILE_NAME,
 
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                                   FNM_PERIOD, FNM_NOMATCH */
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#define BUFFER_SIZE 256
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  /* Resize the pointed-to array to hold one more pointer */
180
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  char **new_array = NULL;
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  do {
182
 
    new_array = realloc(*array, sizeof(char *)
183
 
                        * (size_t) ((*len) + 2));
 
196
#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
 
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    new_array = reallocarray(*array, (size_t)((*len) + 2),
 
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                             sizeof(char *));
 
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#else
 
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    if(((size_t)((*len) + 2)) > (SIZE_MAX / sizeof(char *))){
 
201
      /* overflow */
 
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      new_array = NULL;
 
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      errno = ENOMEM;
 
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    } else {
 
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      new_array = realloc(*array, (size_t)((*len) + 2)
 
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                          * sizeof(char *));
 
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    }
 
208
#endif
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  } while(new_array == NULL and errno == EINTR);
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  /* Malloc check */
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  if(new_array == NULL){
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        custom_argc += 1;
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        {
711
 
          char **new_argv = realloc(custom_argv, sizeof(char *)
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                                    * ((size_t)custom_argc + 1));
 
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#if defined(__GLIBC_PREREQ) and __GLIBC_PREREQ(2, 26)
 
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          char **new_argv = reallocarray(custom_argv,
 
738
                                         (size_t)custom_argc + 1,
 
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                                         sizeof(char *));
 
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#else
 
741
          char **new_argv = NULL;
 
742
          if(((size_t)custom_argc + 1) > (SIZE_MAX / sizeof(char *))){
 
743
            /* overflow */
 
744
            errno = ENOMEM;
 
745
          } else {
 
746
            new_argv = realloc(custom_argv, ((size_t)custom_argc + 1)
 
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                               * sizeof(char *));
 
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          }
 
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#endif
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          if(new_argv == NULL){
714
 
            error(0, errno, "realloc");
 
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            error(0, errno, "reallocarray");
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            exitstatus = EX_OSERR;
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            free(new_arg);
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            free(org_line);
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      }
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      close(plugindir_fd);
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    }
 
876
 
 
877
    /* Work around Debian bug #981302
 
878
       <https://bugs.debian.org/981302> */
 
879
    if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
 
880
      ret = symlink("/proc/self/fd", "/dev/fd");
 
881
      if(ret == -1){
 
882
        error(0, errno, "Failed to create /dev/fd symlink");
 
883
      }
 
884
    }
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  }
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  /* Lower permissions */