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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -17,7 +17,7 @@ | |
| */ | ||
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| static const char my_name[] = "shc"; | ||
| static const char version[] = "Version 4.0.2"; | ||
| static const char version[] = "Version 4.0.3"; | ||
| static const char subject[] = "Generic Shell Script Compiler"; | ||
| static const char cpright[] = "GNU GPL Version 3"; | ||
| static const struct { const char * f, * s, * e; } | ||
|
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@@ -147,6 +147,86 @@ static int BUSYBOXON_flag = 0; | |
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| static const char * RTC[] = { | ||
| "", | ||
| "#if HARDENING", | ||
| "static const char * shc_x[] = {", | ||
| "\"/*\",", | ||
| "\" * Copyright 2019 - Intika <[email protected]>\",", | ||
| "\" * Replace ******** with secret read from fd 21\",", | ||
| "\" * Also change arguments location of sub commands (sh script commands)\",", | ||
| "\" * gcc -Wall -fpic -shared -o shc_secret.so shc_secret.c -ldl\",", | ||
| "\" */\",", | ||
| "\"\",", | ||
| "\"#define _GNU_SOURCE /* needed to get RTLD_NEXT defined in dlfcn.h */\",", | ||
| "\"#define PLACEHOLDER \\\"********\\\"\",", | ||
| "\"#include <dlfcn.h>\",", | ||
| "\"#include <stdlib.h>\",", | ||
| "\"#include <string.h>\",", | ||
| "\"#include <unistd.h>\",", | ||
| "\"#include <stdio.h>\",", | ||
| "\"#include <signal.h>\",", | ||
| "\"\",", | ||
| "\"static char secret[128000]; //max size\",", | ||
| "\"typedef int (*pfi)(int, char **, char **);\",", | ||
| "\"static pfi real_main;\",", | ||
| "\"\",", | ||
| "\"// copy argv to new location\",", | ||
| "\"char **copyargs(int argc, char** argv){\",", | ||
| "\" char **newargv = malloc((argc+1)*sizeof(*argv));\",", | ||
| "\" char *from,*to;\",", | ||
| "\" int i,len;\",", | ||
| "\"\",", | ||
| "\" for(i = 0; i<argc; i++){\",", | ||
| "\" from = argv[i];\",", | ||
| "\" len = strlen(from)+1;\",", | ||
| "\" to = malloc(len);\",", | ||
| "\" memcpy(to,from,len);\",", | ||
| "\" // zap old argv space\",", | ||
| "\" memset(from,'\\\\0',len);\",", | ||
| "\" newargv[i] = to;\",", | ||
| "\" argv[i] = 0;\",", | ||
| "\" }\",", | ||
| "\" newargv[argc] = 0;\",", | ||
| "\" return newargv;\",", | ||
| "\"}\",", | ||
| "\"\",", | ||
| "\"static int mymain(int argc, char** argv, char** env) {\",", | ||
| "\" //fprintf(stderr, \\\"Inject main argc = %d\\\\n\\\", argc);\",", | ||
| "\" return real_main(argc, copyargs(argc,argv), env);\",", | ||
| "\"}\",", | ||
| "\"\",", | ||
| "\"int __libc_start_main(int (*main) (int, char**, char**),\",", | ||
| "\" int argc,\",", | ||
| "\" char **argv,\",", | ||
| "\" void (*init) (void),\",", | ||
| "\" void (*fini)(void),\",", | ||
| "\" void (*rtld_fini)(void),\",", | ||
| "\" void (*stack_end)){\",", | ||
| "\" static int (*real___libc_start_main)() = NULL;\",", | ||
| "\" int n;\",", | ||
| "\"\",", | ||
| "\" if (!real___libc_start_main) {\",", | ||
| "\" real___libc_start_main = dlsym(RTLD_NEXT, \\\"__libc_start_main\\\");\",", | ||
| "\" if (!real___libc_start_main) abort();\",", | ||
| "\" }\",", | ||
| "\"\",", | ||
| "\" n = read(21, secret, sizeof(secret));\",", | ||
| "\" if (n > 0) {\",", | ||
| "\" int i;\",", | ||
| "\"\",", | ||
| "\" if (secret[n - 1] == '\\\\n') secret[--n] = '\\\\0';\",", | ||
| "\" for (i = 1; i < argc; i++)\",", | ||
| "\" if (strcmp(argv[i], PLACEHOLDER) == 0)\",", | ||
| "\" argv[i] = secret;\",", | ||
| "\" }\",", | ||
| "\"\",", | ||
| "\" real_main = main;\",", | ||
| "\"\",", | ||
| "\" return real___libc_start_main(mymain, argc, argv, init, fini, rtld_fini, stack_end);\",", | ||
| "\"}\",", | ||
| "\"\",", | ||
| "0};", | ||
| "#endif /* HARDENING */", | ||
| "", | ||
| "/* rtc.c */", | ||
| "", | ||
| "#include <sys/stat.h>", | ||
|
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@@ -281,26 +361,51 @@ static const char * RTC[] = { | |
| "} ", | ||
| "/* End Seccomp Sandboxing Init */", | ||
| "", | ||
| "void shc_x_file() {", | ||
| " FILE *fp;", | ||
| " int line = 0;", | ||
| "", | ||
| " if ((fp = fopen(\"/tmp/shc_x.c\", \"w\")) == NULL ) {exit(1); exit(1);}", | ||
| " for (line = 0; shc_x[line]; line++) fprintf(fp, \"%s\\n\", shc_x[line]);", | ||
| " fflush(fp);fclose(fp);", | ||
| "}", | ||
| "", | ||
| "int make() {", | ||
| " char * cc, * cflags, * ldflags;", | ||
| " char cmd[4096];", | ||
| "", | ||
| " cc = getenv(\"CC\");", | ||
| " if (!cc) cc = \"cc\";", | ||
| "", | ||
| " sprintf(cmd, \"%s %s -o %s %s\", cc, \"-Wall -fpic -shared\", \"/tmp/shc_x.so\", \"/tmp/shc_x.c -ldl\");", | ||
| " if (system(cmd)) {remove(\"/tmp/shc_x.c\"); return -1;}", | ||
| " remove(\"/tmp/shc_x.c\"); return 0;", | ||
| "}", | ||
| "", | ||
| "void arc4_hardrun(void * str, int len) {", | ||
| " //Decode locally", | ||
| " char tmp2[len];", | ||
| " char tmp3[len+1024];", | ||
| " memcpy(tmp2, str, len);", | ||
| "", | ||
| " unsigned char tmp, * ptr = (unsigned char *)tmp2;", | ||
| "", | ||
| " int lentmp = len;", | ||
| " int pid, status;", | ||
| " pid = fork();", | ||
| "", | ||
| "", | ||
| " shc_x_file();", | ||
| " if (make()) {exit(1);}", | ||
| "", | ||
| " setenv(\"LD_PRELOAD\",\"/tmp/shc_x.so\",1);", | ||
| "", | ||
| " if(pid==0) {", | ||
| "", | ||
| " //Start tracing to protect from dump & trace", | ||
| " if (ptrace(PTRACE_TRACEME, 0, 0, 0) < 0) {", | ||
| " printf(\"Operation not permitted\\n\");", | ||
| " kill(getpid(), SIGKILL);", | ||
| " _exit(1);", | ||
| " }", | ||
| "", | ||
| "", | ||
| " //Decode Bash", | ||
| " while (len > 0) {", | ||
| " indx++;", | ||
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@@ -314,25 +419,29 @@ static const char * RTC[] = { | |
| " len--;", | ||
| " }", | ||
| "", | ||
| " //Exec bash script", | ||
| " //Do the magic", | ||
| " sprintf(tmp3, \"%s %s\", \"'********' 21<<<\", tmp2);", | ||
| "", | ||
| " //Exec bash script //fork execl with 'sh -c'", | ||
| " system(tmp2);", | ||
| "", | ||
| " //Empty script variable", | ||
| " memcpy(tmp2, str, lentmp);", | ||
| "", | ||
| " //Clean temp", | ||
| " remove(\"/tmp/shc_x.so\");", | ||
| "", | ||
| " //Sinal to detach ptrace", | ||
| " ptrace(PTRACE_DETACH, 0, 0, 0);", | ||
| " exit(0);", | ||
| " }", | ||
| " else {", | ||
| " wait(&status);", | ||
| " }", | ||
| " else {wait(&status);}", | ||
| "", | ||
| " /* Seccomp Sandboxing - Start */", | ||
| " seccomp_hardening();", | ||
| "", | ||
| " exit(0);", | ||
| "} ", | ||
| "}", | ||
| "#endif /* HARDENING */", | ||
| "", | ||
| "/*", | ||
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