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Disable PT_DENY_ATTACH and sysctl debugger checking
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wutian
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Mar 23, 2017
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // IPAPatchBypassAntiDebugging.h | ||
| // IPAPatch | ||
| // | ||
| // Created by wutian on 2017/3/23. | ||
| // Copyright © 2017年 Weibo. All rights reserved. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| @interface IPAPatchBypassAntiDebugging : NSObject | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,127 @@ | ||
| // | ||
| // IPAPatchBypassAntiDebugging.m | ||
| // IPAPatch | ||
| // | ||
| // Created by wutian on 2017/3/23. | ||
| // Copyright © 2017年 Weibo. All rights reserved. | ||
| // | ||
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| #import "IPAPatchBypassAntiDebugging.h" | ||
| #import "fishhook.h" | ||
| #import <dlfcn.h> | ||
| #import <sys/sysctl.h> | ||
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| #define TESTS_BYPASS 0 | ||
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| // Sources: | ||
| // https://www.coredump.gr/articles/ios-anti-debugging-protections-part-1/ | ||
| // https://www.coredump.gr/articles/ios-anti-debugging-protections-part-2/ | ||
| // https://www.theiphonewiki.com/wiki/Bugging_Debuggers | ||
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| // Bypassing PT_DENY_ATTACH technique | ||
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| static void * (*original_dlsym)(void *, const char *); | ||
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| int fake_ptrace(int _request, pid_t _pid, caddr_t _addr, int _data) | ||
| { | ||
| return 0; | ||
| } | ||
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| void * hooked_dlsym(void * __handle, const char * __symbol) | ||
| { | ||
| if (strcmp(__symbol, "ptrace") == 0) { | ||
| return &fake_ptrace; | ||
| } | ||
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| return original_dlsym(__handle, __symbol); | ||
| } | ||
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| static void disable_pt_deny_attach() | ||
| { | ||
| original_dlsym = dlsym(RTLD_DEFAULT, "dlsym"); | ||
| rebind_symbols((struct rebinding[1]){{"dlsym", hooked_dlsym}}, 1); | ||
| } | ||
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| // Bypassing sysctl debugger checking technique | ||
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| static int (*original_sysctl)(int *, u_int, void *, size_t *, void *, size_t); | ||
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| typedef struct kinfo_proc ipa_kinfo_proc; | ||
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| int hooked_sysctl(int * arg0, u_int arg1, void * arg2, size_t * arg3, void * arg4, size_t arg5) | ||
| { | ||
| bool modify_needed = arg1 == 4 && arg0[0] == CTL_KERN && arg0[1] == KERN_PROC && arg0[2] == KERN_PROC_PID && arg2 && arg3 && (*arg3 >= sizeof(struct kinfo_proc)); | ||
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| int ret = original_sysctl(arg0, arg1, arg2, arg3, arg4, arg5); | ||
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| if (modify_needed) { | ||
| ipa_kinfo_proc * pointer = arg2; | ||
| ipa_kinfo_proc info = *pointer; | ||
| info.kp_proc.p_flag = 0; | ||
| *pointer = info; | ||
| } | ||
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| return ret; | ||
| } | ||
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| static void disable_sysctl_debugger_checking() | ||
| { | ||
| original_sysctl = dlsym(RTLD_DEFAULT, "sysctl"); | ||
| rebind_symbols((struct rebinding[1]){{"sysctl", hooked_sysctl}}, 1); | ||
| } | ||
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| #if TESTS_BYPASS | ||
| // Tests | ||
| static void test_aniti_debugger(); | ||
| #endif | ||
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| @implementation IPAPatchBypassAntiDebugging | ||
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| + (void)load | ||
| { | ||
| disable_pt_deny_attach(); | ||
| disable_sysctl_debugger_checking(); | ||
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| #if TESTS_BYPASS | ||
| test_aniti_debugger(); | ||
| #endif | ||
| } | ||
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| @end | ||
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| #if TESTS_BYPASS | ||
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| typedef int (*ptrace_ptr_t)(int _request, pid_t _pid, caddr_t _addr, int _data); | ||
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| #if !defined(PT_DENY_ATTACH) | ||
| #define PT_DENY_ATTACH 31 | ||
| #endif | ||
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| static void test_aniti_debugger() | ||
| { | ||
| void* handle = dlopen(0, RTLD_GLOBAL | RTLD_NOW); | ||
| ptrace_ptr_t ptrace_ptr = dlsym(handle, "ptrace"); | ||
| ptrace_ptr(PT_DENY_ATTACH, 0, 0, 0); | ||
| dlclose(handle); | ||
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| int name[4]; | ||
| struct kinfo_proc info; | ||
| size_t info_size = sizeof(info); | ||
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| info.kp_proc.p_flag = 0; | ||
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| name[0] = CTL_KERN; | ||
| name[1] = KERN_PROC; | ||
| name[2] = KERN_PROC_PID; | ||
| name[3] = getpid(); | ||
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| if (sysctl(name, 4, &info, &info_size, NULL, 0) == -1) { | ||
| perror("sysctl"); | ||
| exit(-1); | ||
| } | ||
| bool debugging = ((info.kp_proc.p_flag & P_TRACED) != 0); | ||
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| NSCAssert(!debugging, @"Debug checking should be disabled"); | ||
| } | ||
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| #endif // TESTS_BYPASS |
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| // Copyright (c) 2013, Facebook, Inc. | ||
| // All rights reserved. | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions are met: | ||
| // * Redistributions of source code must retain the above copyright notice, | ||
| // this list of conditions and the following disclaimer. | ||
| // * Redistributions in binary form must reproduce the above copyright notice, | ||
| // this list of conditions and the following disclaimer in the documentation | ||
| // and/or other materials provided with the distribution. | ||
| // * Neither the name Facebook nor the names of its contributors may be used to | ||
| // endorse or promote products derived from this software without specific | ||
| // prior written permission. | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE | ||
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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