About

Cornerstone is one of the top-paid SVN management applications, priced at USD69 and competes with Versions for OSX which is a dozen cheaper (and also more difficult to crack). The Cornerstone crack involves never running Cornerstone, or, at least, a fresh install on a machine where Cornerstone had never run before.

Two jumps are necessary that will bypass all the annoyances used by Cornerstone to convince you to register the software. Cornerstone's set-up procedure includes the following operations in methImpl_V4ApplicationDelegate_finishLaunch:

  1. the code-signature is checked (this usually checks whether the binary has been altered in any way)
  2. starts the licensing kit.
  3. blocks the UI and pops-up the nag screen.

All of these can be bypassed with two jumps in methImpl_V4ApplicationDelegate_finishLaunch:

                                       ; Basic Block Input Regs: rdi -  Killed Regs: rax r15 xmm0
                                            methImpl_V4ApplicationDelegate_finishLaunch:
000000010001aff1 55                              push       rbp
000000010001aff2 4889E5                          mov        rbp, rsp
000000010001aff5 4157                            push       r15
000000010001aff7 4156                            push       r14
000000010001aff9 53                              push       rbx
000000010001affa 50                              push       rax
000000010001affb 4989FF                          mov        r15, rdi
000000010001affe 488B052B702800                  mov        rax, qword [ds:imp___got__NSAppKitVersionNumber]
000000010001b005 F20F1000                        movsd      xmm0, qword [ds:rax]
000000010001b009 E816951B00                      call       imp___stubs__floor
000000010001b00e 660F2E0532A01B00                ucomisd    xmm0, dword [ds:0x1001d5048]
000000010001b016 E97A000000                      jmp        0x10001b095
000000010001b01b 90                              nop        
000000010001b01c 90                              nop        
000000010001b01d 90                              nop        
000000010001b01e 90                              nop        
; ...
000000010001b095 488B35F4272F00                  mov        rsi, qword [ds:objc_sel_setupPanels] ; @selector(setupPanels) XREF=0x10001b07c, 0x10001b016
000000010001b09c 4C89FF                          mov        rdi, r15
000000010001b09f FF1513752800                    call       qword [ds:imp___got__objc_msgSend]
000000010001b0a5 488B35EC272F00                  mov        rsi, qword [ds:objc_sel_setupMainMenu] ; @selector(setupMainMenu)
000000010001b0ac 4C89FF                          mov        rdi, r15
000000010001b0af FF1503752800                    call       qword [ds:imp___got__objc_msgSend]
000000010001b0b5 488B35E4272F00                  mov        rsi, qword [ds:objc_sel_setupDockMenu] ; @selector(setupDockMenu)
000000010001b0bc 4C89FF                          mov        rdi, r15
; ...
000000010001b16c E902000000                      jmp        0x10001b173
000000010001b171 90                              nop        
000000010001b172 90                              nop        
                                       ; Basic Block Input Regs: <nothing> -  Killed Regs: rbx rsp rbp r14 r15
000000010001b173 4883C408                        add        rsp, 0x8                      ; XREF=0x10001b16c
000000010001b177 5B                              pop        rbx
000000010001b178 415E                            pop        r14
000000010001b17a 415F                            pop        r15
000000010001b17c 5D                              pop        rbp
000000010001b17d C3                              ret

The first jump takes care to skip over all the licensing stuff and the second jump is required in order to not fall into the exception trap:

000000010001b16c E902000000                      jmp        0x10001b173
000000010001b171 90                              nop        
000000010001b172 90                              nop        
                                       ; Basic Block Input Regs: <nothing> -  Killed Regs: rbx rsp rbp r14 r15
000000010001b173 4883C408                        add        rsp, 0x8                      ; XREF=0x10001b16c
000000010001b177 5B                              pop        rbx
000000010001b178 415E                            pop        r14
000000010001b17a 415F                            pop        r15
000000010001b17c 5D                              pop        rbp
000000010001b17d C3                              ret        

which would take the program out of the method and into some loop.

Removing Registration Menu Item

Contrary to our previous cracks, this application embeds the License Registration... menu item directly into the code instead of using a NIB/XIB for the menu items. The identified string can be found in the setupMainMenu method (duh) which contains a conditional that skips over the License Registration... menu item in case the application is registered. So, we disregard the postcondition of that conditional and jump over the menu item display:

                                            methImpl_V4ApplicationDelegate_setupMainMenu:
000000010001a995 55                              push       rbp
000000010001a996 4889E5                          mov        rbp, rsp
000000010001a999 4157                            push       r15
000000010001a99b 4156                            push       r14
000000010001a99d 4155                            push       r13
; ... yadda yadda, blah blah blah...
; here comes the interesting part:
000000010001a9f5 488B35CC2D2F00                  mov        rsi, qword [ds:objc_sel_isLicensingUIEnabled] ; @selector(isLicensingUIEnabled)
000000010001a9fc 4889C7                          mov        rdi, rax
000000010001a9ff 41FFD7                          call       r15
000000010001aa02 3C01                            cmp        al, 0x1
; we substitute the jne through a jmp and really not care about the result of cmp
000000010001aa04 E992000000                      jmp        0x10001aa9b
000000010001aa09 90                              nop        
; here is what we would have gotten into:
000000010001aa0a 488B3DE7E82F00                  mov        rdi, qword [ds:0x1003192f8]
000000010001aa11 488D3518E62F00                  lea        rsi, qword [ds:objc_msg_alloc] ; @selector(alloc)
000000010001aa18 FF1512E62F00                    call       qword [ds:objc_msg_alloc]     ; @selector(alloc)
; ... yadda yadda, blah blah blah...
000000010001aa2f 4C8B3D827B2800                  mov        r15, qword [ds:imp___got__objc_msgSend]
000000010001aa36 41FFD7                          call       r15
000000010001aa39 488D1500D33000                  lea        rdx, qword [ds:cfstring_License_Registration___] ; @"License Registration..."
; ... yadda yadda, blah blah blah...
; we jumped to the rest of the menu setup which is now clean:
000000010001aa9b 488B357E162F00                  mov        rsi, qword [ds:objc_sel_sharedInstance] ; @selector(sharedInstance) XREF=0x10001aa04
000000010001aaa2 488B3D9FE72F00                  mov        rdi, qword [ds:objc_classref_V4Defaults]
000000010001aaa9 4C8B3D087B2800                  mov        r15, qword [ds:imp___got__objc_msgSend]
; ... yadda yadda, blah blah blah...

Patch

For instructions on how to apply this patch to your Conrnerstone 2.7.14 please see the applying binary patches part of the tutorial.

Cornerstone.bsdiff.uue
begin 644 Cornerstone.bsdiff
M0E-$249&-#!.`````````!8!````````P&AX``````!"6F@Y,4%9)E-9?]@R
M.@``%4U+<`A&`'"``,!`#`(`0(``("``,4PFF@-,0A`,C09J(J39B2YF9B2D
M]07&>`JVB3P/B[DBG"A(/^P9'0!"6F@Y,4%9)E-9/(N-?```0G__S8-01E$`
M`Q!@,&```(2&T$`(0!0$@V`'B1A0%$A.Q"^P`/A(:34T0``&@`!HT#33(])M
M"`<PF`3`"83":8``!,FF@81*2C30````T:````;"EQ@M,51+$QY(.&(A(B!5
M?HH%<1D4!0,$!50!'@@H`B7L@#4(!RDTB99N:^;C*(``KBGN6?94CPW\,JN(
M0FGXT`UHYT40`!6D.N-(HR?T[X\D&\1`1```$1;'-.U)#PZTTF1!06:K#,,7
M3FX`J[2\Q3:!GCX4([`D1-]?N*9@E?#J5H6A625@M58P`9F`M'OT#+]\.$69
ME2UA`1``5LAOR0KAZEMM+C_%W)%.%"0/(N-?`$)::#DQ05DF4UEA(0'C``!H
=T`#````@``@@`""E-!F-"6PB7B[DBG"A(,)"`\8`
`
end

That is it, for the crack of Cornerstone v2.7.14.


cracks/cornerstone.txt ยท Last modified: 2017/02/22 18:30 (external edit)

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