├── .gitmodules ├── app2dylib.xcodeproj ├── project.xcworkspace │ └── contents.xcworkspacedata └── project.pbxproj ├── makefile ├── .gitignore ├── README.md └── src ├── main.mm └── app2dylib_template.h /.gitmodules: -------------------------------------------------------------------------------- 1 | [submodule "class-dump"] 2 | path = class-dump 3 | url = https://github.com/0xced/class-dump 4 | -------------------------------------------------------------------------------- /app2dylib.xcodeproj/project.xcworkspace/contents.xcworkspacedata: -------------------------------------------------------------------------------- 1 | 2 | 4 | 6 | 7 | 8 | -------------------------------------------------------------------------------- /makefile: -------------------------------------------------------------------------------- 1 | 2 | .PHONY:app2dylib 3 | 4 | TMP_FILE := libMachObjC.a app2dylib.dSYM/ build/ 5 | 6 | restore-symbol: 7 | rm -f app2dylib 8 | xcodebuild -project "app2dylib.xcodeproj" -target "app2dylib" -configuration "Release" CONFIGURATION_BUILD_DIR="$(shell pwd)" -jobs 4 build 9 | rm -rf $(TMP_FILE) 10 | 11 | 12 | clean: 13 | rm -rf app2dylib $(TMP_FILE) 14 | 15 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | app2dylib 2 | 3 | 4 | # svn 5 | *.svn* 6 | 7 | # mac 8 | __MACOSX 9 | *.DS_Store* 10 | *._* 11 | *.lock 12 | *.Spotlight-V100 13 | *.Trashes 14 | *ehthumbs.db 15 | *Thumbs.db 16 | 17 | # Python 18 | *.pyc 19 | __pycache__/ 20 | 21 | 22 | # Vim 23 | *.swp 24 | *.swo 25 | *.swn 26 | 27 | # Xcode 28 | *~.nib 29 | build/ 30 | *.pbxuser 31 | !default.pbxuser 32 | *.mode1v3 33 | !default.mode1v3 34 | *.mode2v3 35 | !default.mode2v3 36 | *.perspectivev3 37 | !default.perspectivev3 38 | xcuserdata 39 | *.xccheckout 40 | *.xcscmblueprint 41 | *.moved-aside 42 | DerivedData 43 | *.hmap 44 | *.ipa 45 | *.xcuserstate 46 | 47 | # generated files 48 | bin/ 49 | gen/ 50 | 51 | # built application files 52 | *.apk 53 | *.ap_ 54 | 55 | # files for the dex VM 56 | *.dex 57 | 58 | # Java class files 59 | *.class 60 | 61 | # Local configuration file (sdk path, etc) 62 | local.properties 63 | 64 | # Eclipse project files 65 | .classpath 66 | .project 67 | .settings/ 68 | 69 | # Proguard folder generated by Eclipse 70 | proguard/ 71 | 72 | # Intellij project files 73 | *.iml 74 | *.ipr 75 | *.iws 76 | .idea/ 77 | 78 | #Pod 79 | Pods/ 80 | !podfile 81 | !podfile.lock 82 | 83 | # Gradle files 84 | .gradle 85 | build/ 86 | 87 | # Ignore Gradle GUI config 88 | gradle-app.setting 89 | 90 | # Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored) 91 | !gradle-wrapper.jar 92 | 93 | #Android studio For eclipse 94 | #build.gradle 95 | #gradle/ 96 | #gradlew 97 | #gradlew.bat 98 | #.gradle/ 99 | # 100 | 101 | 102 | 103 | #tweak 104 | _/ 105 | .theos/ 106 | obj/ 107 | *.deb 108 | 109 | 110 | 111 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # app2dylib 2 | A reverse engineering tool to convert iOS app to dylib 3 | 4 | 5 | # Usage 6 | 7 | ``` 8 | 9 | git clone --recursive https://github.com/tobefuturer/app2dylib.git 10 | cd app2dylib && make 11 | ./app2dylib 12 | 13 | ``` 14 | 15 | example : 16 | 17 | ``` 18 | 19 | ./app2dylib /tmp/AlipayWallet -o /tmp/libAlipayApp.dylib 20 | 21 | ``` 22 | 23 | You can use libAlipayApp.dylib as a normal dynamic library. 24 | 25 | Call OC method or call C function like this: 26 | 27 | ``` 28 | 29 | #import 30 | #import 31 | 32 | #import 33 | #import 34 | #import 35 | 36 | int main(int argc, char * argv[]) { 37 | NSString * dylibName = @"libAlipayApp"; 38 | NSString * path = [[NSBundle mainBundle] pathForResource:dylibName ofType:@"dylib"]; 39 | if (dlopen(path.UTF8String, RTLD_NOW) == NULL){ 40 | NSLog(@"dlopen failed ，error %s", dlerror()); 41 | return 0; 42 | }; 43 | 44 | uint32_t dylib_count = _dyld_image_count(); 45 | uint64_t slide = 0; 46 | for (int i = 0; i < dylib_count; i ++) { 47 | const char * name = _dyld_get_image_name(i); 48 | if ([[NSString stringWithUTF8String:name] isEqualToString:path]) { 49 | slide = _dyld_get_image_vmaddr_slide(i); 50 | } 51 | } 52 | assert(slide != 0); 53 | 54 | 55 | Class c = NSClassFromString(@"aluSecurity"); 56 | NSString * plain = @"alipay"; 57 | NSString * pubkey = @"MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDZ6i9VNEGEaZaYE7XffA9XRj15cp/ZKhHYY43EEva8LIhCWi29EREaF4JjZVMwFpUAfrL+9gpA7NMQmaMRHbrz1KHe2Ho4HpUhEac8M9zUbNvaDKSlhx0lq/15TQP+57oQbfJ9oKKd+he4Yd6jpBI3UtGmwJyN/T1S0DQ0aXR8OQIDAQAB"; 58 | NSString * cipher = [c performSelector:NSSelectorFromString(@"rsaEncryptText:pubKey:") withObject:plain withObject:pubkey]; 59 | NSLog(@"ciphertext： %@", cipher); 60 | 61 | typedef int (*BASE64_ENCODE_FUNC_TYPE) (char * output, int * output_size , char * input, int input_length); 62 | 63 | /** get function pointer*/ 64 | BASE64_ENCODE_FUNC_TYPE base64_encode = (BASE64_ENCODE_FUNC_TYPE)(slide + 0xa798e4); 65 | char output[1000] = {0}; 66 | int length = 1000; 67 | char * input = "alipay"; 68 | base64_encode(output, & length, input, (int)strlen(input)); 69 | NSLog(@"base64 length: %d , %s", length, output); 70 | 71 | } 72 | 73 | 74 | ``` 75 | -------------------------------------------------------------------------------- /src/main.mm: -------------------------------------------------------------------------------- 1 | // 2 | // main.m 3 | // restore-symbol 4 | // 5 | // Created by EugeneYang on 16/8/16. 6 | // 7 | // 8 | 9 | #import 10 | #include 11 | #include 12 | #import "CDFile.h" 13 | #import "CDMachOFile.h" 14 | #import "CDLCSymbolTable.h" 15 | #import "CDLCSegment.h" 16 | #import "CDSymbol.h" 17 | #import "CDLCDynamicSymbolTable.h" 18 | #import "CDLCLinkeditData.h" 19 | #import "CDClassDump.h" 20 | #import "CDFatFile.h" 21 | #import "CDLCDyldInfo.h" 22 | #import "CDSection.h" 23 | 24 | 25 | #include 26 | #include 27 | #include 28 | #include 29 | 30 | 31 | 32 | #import "app2dylib_template.h" 33 | 34 | 35 | 36 | 37 | NSMutableSet* rebasePointerSet = nil; 38 | 39 | 40 | @implementation CDLCDyldInfo (app2dylib) 41 | 42 | //categories overwrite the original method(empty implement) to get callback for every rebase address 43 | - (void)rebaseAddress:(uint64_t)address type:(uint8_t)type; 44 | { 45 | if (self.machOFile.uses64BitABI) { 46 | [rebasePointerSet addObject:[NSNumber numberWithUnsignedLongLong:address]]; 47 | } 48 | } 49 | 50 | @end 51 | 52 | 53 | #define APP2DYLIB_BASE_VERSION "1.0 (64 bit)" 54 | 55 | 56 | void print_usage(void) 57 | { 58 | NSLog(@ 59 | "\n" 60 | "app2dylib %s\n" 61 | "\n" 62 | "Usage: app2dylib -o

\n" 63 | "\n" 64 | " app-mach-o-file : an executable file for app (decrypted)\n" 65 | "\n" 66 | , 67 | APP2DYLIB_BASE_VERSION 68 | ); 69 | } 70 | 71 | 72 | 73 | 74 | 75 | 76 | int main(int argc, char * argv[]) { 77 | 78 | 79 | NSString * inpath = nil; 80 | 81 | NSString * outpath = nil; 82 | 83 | int ch; 84 | 85 | struct option longopts[] = { 86 | { "output", required_argument, NULL, 'o' }, 87 | { NULL, 0, NULL, 0 }, 88 | }; 89 | 90 | 91 | while ( (ch = getopt_long(argc, argv, "o:", longopts, NULL)) != -1) { 92 | switch (ch) { 93 | case 'o': 94 | outpath = [NSString stringWithUTF8String:optarg]; 95 | break; 96 | default: 97 | break; 98 | } 99 | } 100 | 101 | if (optind < argc) { 102 | inpath = [NSString stringWithUTF8String:argv[optind]]; 103 | } 104 | 105 | 106 | if (inpath.length == 0 || outpath.length == 0) { 107 | print_usage(); 108 | exit(1); 109 | } 110 | 111 | NSFileManager *fileManager = [NSFileManager defaultManager]; 112 | 113 | if (![fileManager fileExistsAtPath:inpath]) { 114 | NSLog(@"%@ not exist.", inpath); 115 | exit(1); 116 | } 117 | 118 | 119 | rebasePointerSet = [NSMutableSet set]; 120 | 121 | CDFile * ofile = [CDFile fileWithContentsOfFile:inpath searchPathState:nil]; 122 | 123 | 124 | if ([ofile isKindOfClass:[CDFatFile class]] ) { 125 | NSLog(@"app2dylib supports armv7 and arm64 archtecture, but not support fat file. Please use lipo to thin the image file first."); 126 | exit(1); 127 | } 128 | 129 | 130 | 131 | 132 | CDMachOFile * machOFile = (CDMachOFile *)ofile; 133 | if ((machOFile.flags & MH_PIE) == 0){ 134 | NSLog(@"%@ is not a position-independent executable, can\'t convert to dylib.", inpath); 135 | exit(1); 136 | } 137 | 138 | const bool Is32Bit = ! machOFile.uses64BitABI; 139 | if (Is32Bit) { 140 | app2dylib< uint32_t , struct mach_header, struct segment_command, struct section, struct nlist, struct dylib_command>(inpath, outpath); 141 | } else { 142 | app2dylib< uint64_t , struct mach_header_64, struct segment_command_64, struct section_64, struct nlist_64, struct dylib_command>(inpath, outpath); 143 | } 144 | 145 | NSLog(@"Remember to codesign the generated dylib."); 146 | fprintf(stderr,"=========== Finish ============\n"); 147 | } 148 | -------------------------------------------------------------------------------- /src/app2dylib_template.h: -------------------------------------------------------------------------------- 1 | // 2 | // app2dylib_template.h 3 | // app2dylib 4 | // 5 | // Created by EugeneYang on 16/10/5. 6 | // Copyright © 2016年 Jun. All rights reserved. 7 | // 8 | 9 | #ifndef app2dylib_template_h 10 | #define app2dylib_template_h 11 | 12 | 13 | #import 14 | #include 15 | #include 16 | #import "CDFile.h" 17 | #import "CDMachOFile.h" 18 | #import "CDLCSymbolTable.h" 19 | #import "CDLCSegment.h" 20 | #import "CDSymbol.h" 21 | #import "CDLCDynamicSymbolTable.h" 22 | #import "CDLCLinkeditData.h" 23 | #import "CDClassDump.h" 24 | #import "CDFatFile.h" 25 | #import "CDLCDyldInfo.h" 26 | #import "CDSection.h" 27 | 28 | #define round(v,r) ( (v + (r-1) ) & (-r) ) 29 | 30 | extern NSMutableSet * rebasePointerSet; 31 | 32 | 33 | #define PAGEZERO_SIZE_AFTER_MODIFY 0x4000 34 | 35 | 36 | 37 | 38 | 39 | template 40 | void app2dylib(NSString *inpath, NSString * outpath){ 41 | 42 | 43 | NSMutableData * outData = [[NSMutableData alloc] initWithContentsOfFile:inpath]; 44 | 45 | CDFile * ofile = [CDFile fileWithContentsOfFile:inpath searchPathState:nil]; 46 | 47 | CDMachOFile * machOFile = (CDMachOFile *)ofile; 48 | CDLCSegment * pagezeroSeg = [machOFile segmentWithName:@"__PAGEZERO"]; 49 | [machOFile.dyldInfo performSelector:@selector(logRebaseInfo)]; 50 | 51 | auto seg_cmd = (segment_command_t *)((char *)outData.mutableBytes + pagezeroSeg.commandOffset); 52 | const uint64 PAGEZERO_SIZE_DELTA = seg_cmd -> vmsize - PAGEZERO_SIZE_AFTER_MODIFY; 53 | 54 | auto header = (mach_header_t * )outData.mutableBytes; 55 | header -> filetype = MH_DYLIB; 56 | header -> flags = MH_NOUNDEFS | MH_DYLDLINK | MH_TWOLEVEL | MH_NO_REEXPORTED_DYLIBS; 57 | 58 | for (CDLCSegment *seg in [machOFile segments]) { 59 | auto seg_cmd = (segment_command_t *)((char *)outData.mutableBytes + seg.commandOffset); 60 | assert([seg.name isEqualToString:pagezeroSeg.name] || seg_cmd -> vmaddr > PAGEZERO_SIZE_DELTA); 61 | seg_cmd -> vmaddr -= PAGEZERO_SIZE_DELTA; 62 | 63 | 64 | char * segment_end = (char *)seg_cmd + (seg.cmdsize); 65 | for (auto sec = (section_t *)(seg_cmd + 1); (char *)sec < (char*)segment_end; sec += 1) { 66 | assert(sec -> addr > PAGEZERO_SIZE_DELTA); 67 | sec -> addr -= PAGEZERO_SIZE_DELTA; 68 | } 69 | } 70 | 71 | auto __pagezero_seg_cmd = (segment_command_t *) ((char *)outData.mutableBytes + sizeof(mach_header_t)); 72 | __pagezero_seg_cmd -> vmaddr = 0; 73 | __pagezero_seg_cmd -> vmsize = PAGEZERO_SIZE_AFTER_MODIFY; 74 | __pagezero_seg_cmd -> maxprot = 0x3; 75 | __pagezero_seg_cmd -> initprot = 0x3; 76 | strcpy(__pagezero_seg_cmd -> segname, "__ZERO"); 77 | 78 | 79 | 80 | NSString * dylibName = [outpath lastPathComponent]; 81 | 82 | NSString * dylibPath = nil; 83 | 84 | if(machOFile.minVersionIOS != nil && machOFile.minVersionMacOSX == nil) { 85 | dylibPath = [@"@executable_path" stringByAppendingPathComponent:dylibName]; 86 | } 87 | 88 | if(machOFile.minVersionIOS == nil && machOFile.minVersionMacOSX != nil) { 89 | dylibPath = [@"@executable_path/../Resources" stringByAppendingPathComponent:dylibName]; 90 | } 91 | 92 | if(!dylibPath){ 93 | NSLog(@"Mach-o file must have a Load Command named LC_VERSION_MIN_MACOSX or LC_VERSION_MIN_IPHONEOS!"); 94 | exit(1); 95 | } 96 | 97 | CDLCDyldInfo *dyldInfo = machOFile.dyldInfo; 98 | uint32 dylib_cmd_size = round((int)dylibPath.length + 1,8) + sizeof(dylib_command_t); 99 | auto dylib_cmd = (dylib_command_t *)((char *)outData.mutableBytes + dyldInfo.commandOffset); 100 | char *loadcmd_end = (char *)outData.mutableBytes + sizeof(mach_header_t) + header -> sizeofcmds; 101 | 102 | { 103 | CDLCSegment *TEXT_seg = [machOFile segmentWithName:@"__TEXT"]; 104 | CDSection *text_sec = [TEXT_seg sectionWithName:@"__text"]; 105 | 106 | uint64_t fileOffset_text_sec = [text_sec fileOffsetForAddress:text_sec.addr]; 107 | 108 | uint64_t need_space = sizeof(mach_header_t) + header -> sizeofcmds + dylib_cmd_size; 109 | if (fileOffset_text_sec < need_space) { 110 | NSLog(@"It seem there is not empty sapce to insert dylib_command"); 111 | exit(1); 112 | } 113 | } 114 | 115 | 116 | long movesize = loadcmd_end - (char *)dylib_cmd; 117 | void *moveto = (char * )dylib_cmd + dylib_cmd_size; 118 | memmove(moveto, dylib_cmd, movesize); 119 | 120 | dylib_cmd -> cmd = LC_ID_DYLIB; 121 | dylib_cmd -> cmdsize = dylib_cmd_size; 122 | dylib_cmd -> dylib.name.offset = sizeof(dylib_command_t); 123 | dylib_cmd -> dylib.timestamp = 1; 124 | dylib_cmd -> dylib.current_version = 0x10000; 125 | dylib_cmd -> dylib.compatibility_version = 0x10000; 126 | strcpy((char *)dylib_cmd + sizeof(dylib_command_t), dylibPath.UTF8String); 127 | 128 | 129 | header -> ncmds += 1; 130 | header -> sizeofcmds += dylib_cmd_size; 131 | 132 | 133 | for (NSNumber * num in rebasePointerSet) { 134 | uint64_t addr = [num unsignedLongLongValue]; 135 | uint64_t offset = [machOFile dataOffsetForAddress:addr]; 136 | auto locationToFix = (IntTypeForPointer *) ((char *)outData.mutableBytes + (uint32_t)offset); 137 | (* locationToFix) -= PAGEZERO_SIZE_DELTA; 138 | } 139 | 140 | 141 | 142 | char * nlistsData = (char *)outData.mutableBytes + machOFile.symbolTable.symoff; 143 | 144 | 145 | nlist_t * list = (nlist_t * )nlistsData; 146 | for (int i = 0; i < machOFile.symbolTable.nsyms; i ++){ 147 | if(((list[i].n_type & N_TYPE) == N_SECT) && (list[i].n_sect != NO_SECT)){ 148 | if (list[i].n_value > PAGEZERO_SIZE_DELTA) { 149 | list[i].n_value -= PAGEZERO_SIZE_DELTA; 150 | } 151 | } 152 | } 153 | 154 | 155 | NSError * err = nil; 156 | [outData writeToFile:outpath options:NSDataWritingWithoutOverwriting error:&err]; 157 | 158 | if (!err) { 159 | chmod(outpath.UTF8String, 0755); 160 | }else{ 161 | NSLog(@"Write file error : %@", err); 162 | return; 163 | } 164 | 165 | 166 | 167 | } 168 | 169 | 170 | 171 | #endif /* app2dylib_template_h */ 172 | -------------------------------------------------------------------------------- /app2dylib.xcodeproj/project.pbxproj: -------------------------------------------------------------------------------- 1 | // !$*UTF8*$! 2 | { 3 | archiveVersion = 1; 4 | classes = { 5 | }; 6 | objectVersion = 46; 7 | objects = { 8 | 9 | /* Begin PBXBuildFile section */ 10 | 8F54CA371DA4298500221131 /* main.mm in Sources */ = {isa = PBXBuildFile; fileRef = 8F54CA361DA4298500221131 /* main.mm */; }; 11 | 8F54CA521DA4363200221131 /* libMachObjC.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 8F54CA421DA429A600221131 /* libMachObjC.a */; 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