From 4481b7b2989b8974c85adc0298d5eb89dee055d4 Mon Sep 17 00:00:00 2001 From: "Jonathan \"Duke\" Leto" Date: Sun, 22 Jan 2012 20:37:32 -0800 Subject: [PATCH] Initial import of perlnecklace 0.3 --- COPYING | 481 ++++++++++++++++++++++++++++++++++++++++++++++ INSTALL | 8 + Makefile | 33 ++++ README | 48 +++++ config.h | 33 ++++ perlnecklace.c | 139 ++++++++++++++ test/openfiles.pl | 16 ++ 7 files changed, 758 insertions(+) create mode 100644 COPYING create mode 100644 INSTALL create mode 100644 Makefile create mode 100644 README create mode 100644 config.h create mode 100644 perlnecklace.c create mode 100644 test/openfiles.pl diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..92b8903 --- /dev/null +++ b/COPYING @@ -0,0 +1,481 @@ + GNU LIBRARY GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + +[This is the first released version of the library GPL. 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So I wrote Perl Necklace, to scratch an itch, and to let me +sleep a bit better knowing that I have one more weapon in my anti-script-kiddie arsenal. + +How it works: + + The chroot feature doesn't chroot perl, it justs chroots the script that is +running. So the only thing that need to exist in the chrooted environment is +the /usr/lib/perl5 directory (where all the modules are installed). You may also +want a /dev/log in there to use syslogd. + + If FIX_PWD is set, and you have created symlinks so that the new path +in the chrooted evironment is the same as the old one, then scripts can continue +to use relative paths when open/manipulating files. If you don't set FIX_PWD, all +scripts that use relative paths will brake because when chrooting, you must chdir +to the new root directory. + + Fiddle with the config.h, it is easy. + +Note: + Keep a backup of your old perl, like /usr/bin/realperl or something. Don't + say I didn't warn you. + + +Requirements: + Perl 5.005 + +Enhancements: + If you have a patch/bugfix/suggestion, email me, I want to make Perl Necklace +as versatile as possible. + +Tested Environments: + Redhat Linux 6.2 2.2.14 x86 , perl 5.005_03 + FreeBSD 3.4-RELEASE x86 , perl 5.005_03 + OpenBSD 2.6 x86, 5.005_03 + +Doesn't work on: + IRIX 6.5 ( missing headers ) + diff --git a/config.h b/config.h new file mode 100644 index 0000000..93261c1 --- /dev/null +++ b/config.h @@ -0,0 +1,33 @@ +/* Length of string that is logged to syslog */ +#define LENGTH 75 + +/* Enable/Disable Modules */ +#define ALLOW_MODULES 1 + +/* Enable/Disable Syslog */ +#define SYSLOG 1 + +/* Syslog facility name */ +#define FACILITY LOG_LOCAL5 + +/* Enable Disable chroot */ +#define CHROOT 1 + +/* Directory to chroot to. All paths starting with / will be mapped to + this directory. To disable, set to "/" ( with quotes ). */ +#define CHROOT_DIR "/" + +/* Resource Limit Maximums */ +#define SET_LIMITS 1 +#define CORE_SIZE 0 +#define OPEN_FILES 8 /* Needs at least 4 to run */ +#define PROCESSES 5 +#define FILE_SIZE 20*1024*1024 /* 20MB */ +#define CPU_TIME 600 /* seconds */ + +#ifndef PATH_MAX + #define PATH_MAX 255 /* Max length of pathname */ +#endif + +#define FIX_PWD 1 /* Enable/Disable fixing the $PWD */ + diff --git a/perlnecklace.c b/perlnecklace.c new file mode 100644 index 0000000..37e7bca --- /dev/null +++ b/perlnecklace.c @@ -0,0 +1,139 @@ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "config.h" + +/* All this crap is needed to allow perl modules, copied from perlembed manpage */ +static void xs_init _((void)); + +EXTERN_C void boot_DynaLoader _((CV* cv)); +EXTERN_C void xs_init() + { + char *file = __FILE__; + newXS("DynaLoader::boot_DynaLoader", boot_DynaLoader, file); + }; + +static PerlInterpreter *my_perl; + +static void resource_limits (void){ + struct rlimit core,openfiles,procs,filesize,cputime; + + core.rlim_cur = core.rlim_max = CORE_SIZE; + openfiles.rlim_cur = openfiles.rlim_max = OPEN_FILES; + procs.rlim_cur = procs.rlim_max = PROCESSES; + filesize.rlim_cur = filesize.rlim_max = FILE_SIZE; + cputime.rlim_cur = cputime.rlim_max = CPU_TIME; + + if ( setrlimit(RLIMIT_CORE,&core) ){ + printf("Couldn't set corefile size\n"); + exit(1); + }; + if ( setrlimit(RLIMIT_NOFILE,&openfiles) ){ + printf("Couldn't set openfiles\n"); + exit(1); + }; + if ( setrlimit(RLIMIT_NPROC,&procs) ){ + printf("Couldn't set procs\n"); + exit(1); + }; + if ( setrlimit(RLIMIT_FSIZE,&filesize) ){ + printf("Couldn't set filesize\n"); + exit(1); + }; + if ( setrlimit(RLIMIT_CPU,&cputime) ){ + printf("Couldn't set cputime\n"); + exit(1); + }; + +} + +int main ( int argc, char **argv, char **env) { + + int argvsize = 0, i = 0; + char *argvbuf,*pwd; + char tmp; + struct passwd *pw; + struct group *gw; + int path_max = PATH_MAX + 2; /* The getcwd docs say to do this. */ + + + if( FIX_PWD ){ + pwd = malloc(path_max); + getcwd(pwd,path_max); + }; + + if( CHROOT ){ + if( chroot(CHROOT_DIR) ){ + printf("Couldn't chroot\n"); + exit(1); + } else { + if( chdir(CHROOT_DIR) ){ + printf("Couldn't chdir\n"); + exit(1); + } + } + } + if( FIX_PWD ){ + chdir(pwd); + } + + if( SET_LIMITS ) + resource_limits(); + + /* No more need for high privs, lose them */ + if( setuid(geteuid()) ){ + printf("Couldn't setuid\n"); + exit(1); + }; + + for(i = 0; i < argc ; argvsize += strlen(argv[i++])); + argvsize += argc; + + if (!(argvbuf = malloc(argvsize))){ + printf("Couldn't malloc\n"); + exit(1); + } + + for ( i = 0, *argvbuf = 0; i < argc;){ + strcat(argvbuf,argv[i]); + if(++i < argc) + strcat(argvbuf, " "); + }; + + tmp = argvbuf[LENGTH]; + argvbuf[LENGTH]= '\0'; + + my_perl = perl_alloc(); + perl_construct(my_perl); + + if( ALLOW_MODULES ){ + perl_parse(my_perl,xs_init, argc, argv, env); + } else { + perl_parse(my_perl,NULL,argc,argv,env); + } + + /* Run the entire program */ + perl_run(my_perl); + + perl_destruct(my_perl); + perl_free(my_perl); + pw = getpwuid(geteuid()); + gw = getgrgid(getegid()); + if ( pw && gw && SYSLOG){ + syslog(FACILITY,"[%d] (%s,%s) ran '%s'",getpid(), pw->pw_name, gw->gr_name, argvbuf ); + } else { + syslog(FACILITY,"[%d] (%d,%d) ran '%s'",getpid(),getuid(),getgid(), argvbuf ); + } + return 0; +}; + +/* Das boot. */ + diff --git a/test/openfiles.pl b/test/openfiles.pl new file mode 100644 index 0000000..7365655 --- /dev/null +++ b/test/openfiles.pl @@ -0,0 +1,16 @@ + + + +$string = ' + open(FDNUM,">>./testfile_NUM") or die $!; + print FDNUM "test\n"; + '; + +for ( 1 .. 20 ){ + $tmp = $string; + $tmp =~ s/NUM/$_/g; + unless ( eval $tmp) { + print "Open failed of $_\n"; + } +}; +