CTF-All-In-One/doc/2.5_radare2.md

2.4 Radare2

• 简介
• 安装
• 基本使用方法
• 在 CTF 中的运用

简介

IDA Pro 昂贵的价格令很多二进制爱好者望而却步，于是在开源世界中催生出了一个新的逆向工程框架——Radare2，它拥有非常强大的功能，包括反汇编、调试、打补丁、虚拟化等等，而且可以运行在几乎所有的主流平台上（GNU/Linux、Windows、BSD、iOS、OSX……）。Radare2 开发之初仅提供了基于命令行的操作，尽管现在也有非官方的GUI，但我更喜欢直接在终端上运行它，当然这也就意味着更高陡峭的学习曲线。Radare2　是由一系列的组件构成的，这些组件赋予了 Radare2 强大的分析能力，可以在 Radare2 中或者单独被使用。

这里是 Radare2 与其他二进制分析工具的对比。（Comparison Table）

安装

安装

$ git clone https://github.com/radare/radare2.git
$ cd radare2
$ ./sys/install.sh

更新

$ ./sys/install.sh

卸载

$ make uninstall
$ make purge

基本使用方法

小工具

Radare2 是由一些命令行小工具组成的：

• radare2：十六进制编辑器和调试器的核心。
• rabin2：从可执行二进制文件中提取信息。
• rasm2：汇编和反汇编。
• rahash2：基于块的哈希工具。
• radiff2：二进制文件或代码差异比对。
• rafind2：查找字节模式。
• ragg2：r_egg 的前端，将以简单高级语言编写的程序编译成x86、x86-64和ARM的二进制文件。
• rarun2：用于在不同环境中运行程序。
• rax2：数据格式转换。

radare2/r2

$ r2 -h
Usage: r2 [-ACdfLMnNqStuvwzX] [-P patch] [-p prj] [-a arch] [-b bits] [-i file]
          [-s addr] [-B baddr] [-M maddr] [-c cmd] [-e k=v] file|pid|-|--|=
 --           run radare2 without opening any file
 -            same as 'r2 malloc://512'
 =            read file from stdin (use -i and -c to run cmds)
 -=           perform !=! command to run all commands remotely
 -0           print \x00 after init and every command
 -a [arch]    set asm.arch
 -A           run 'aaa' command to analyze all referenced code
 -b [bits]    set asm.bits
 -B [baddr]   set base address for PIE binaries
 -c 'cmd..'   execute radare command
 -C           file is host:port (alias for -c+=http://%s/cmd/)
 -d           debug the executable 'file' or running process 'pid'
 -D [backend] enable debug mode (e cfg.debug=true)
 -e k=v       evaluate config var
 -f           block size = file size
 -F [binplug] force to use that rbin plugin
 -h, -hh      show help message, -hh for long
 -H ([var])   display variable
 -i [file]    run script file
 -I [file]    run script file before the file is opened
 -k [k=v]     perform sdb query into core->sdb
 -l [lib]     load plugin file
 -L           list supported IO plugins
 -m [addr]    map file at given address (loadaddr)
 -M           do not demangle symbol names
 -n, -nn      do not load RBin info (-nn only load bin structures)
 -N           do not load user settings and scripts
 -o [OS/kern] set asm.os (linux, macos, w32, netbsd, ...)
 -q           quiet mode (no prompt) and quit after -i
 -p [prj]     use project, list if no arg, load if no file
 -P [file]    apply rapatch file and quit
 -R [rarun2]  specify rarun2 profile to load (same as -e dbg.profile=X)
 -s [addr]    initial seek
 -S           start r2 in sandbox mode
 -t           load rabin2 info in thread
 -u           set bin.filter=false to get raw sym/sec/cls names
 -v, -V       show radare2 version (-V show lib versions)
 -w           open file in write mode
 -X [rr2rule] specify custom rarun2 directive
 -z, -zz      do not load strings or load them even in raw

rabin2

$ rabin2 -h
Usage: rabin2 [-AcdeEghHiIjlLMqrRsSvVxzZ] [-@ at] [-a arch] [-b bits] [-B addr]
              [-C F:C:D] [-f str] [-m addr] [-n str] [-N m:M] [-P[-P] pdb]
              [-o str] [-O str] [-k query] [-D lang symname] | file
 -@ [addr]       show section, symbol or import at addr
 -A              list sub-binaries and their arch-bits pairs
 -a [arch]       set arch (x86, arm, .. or <arch>_<bits>)
 -b [bits]       set bits (32, 64 ...)
 -B [addr]       override base address (pie bins)
 -c              list classes
 -C [fmt:C:D]    create [elf,mach0,pe] with Code and Data hexpairs (see -a)
 -d              show debug/dwarf information
 -D lang name    demangle symbol name (-D all for bin.demangle=true)
 -e              entrypoint
 -E              globally exportable symbols
 -f [str]        select sub-bin named str
 -F [binfmt]     force to use that bin plugin (ignore header check)
 -g              same as -SMZIHVResizcld (show all info)
 -G [addr]       load address . offset to header
 -h              this help message
 -H              header fields
 -i              imports (symbols imported from libraries)
 -I              binary info
 -j              output in json
 -k [sdb-query]  run sdb query. for example: '*'
 -K [algo]       calculate checksums (md5, sha1, ..)
 -l              linked libraries
 -L [plugin]     list supported bin plugins or plugin details
 -m [addr]       show source line at addr
 -M              main (show address of main symbol)
 -n [str]        show section, symbol or import named str
 -N [min:max]    force min:max number of chars per string (see -z and -zz)
 -o [str]        output file/folder for write operations (out by default)
 -O [str]        write/extract operations (-O help)
 -p              show physical addresses
 -P              show debug/pdb information
 -PP             download pdb file for binary
 -q              be quiet, just show fewer data
 -qq             show less info (no offset/size for -z for ex.)
 -Q              show load address used by dlopen (non-aslr libs)
 -r              radare output
 -R              relocations
 -s              symbols
 -S              sections
 -u              unfiltered (no rename duplicated symbols/sections)
 -v              display version and quit
 -V              Show binary version information
 -x              extract bins contained in file
 -X [fmt] [f] .. package in fat or zip the given files and bins contained in file
 -z              strings (from data section)
 -zz             strings (from raw bins [e bin.rawstr=1])
 -zzz            dump raw strings to stdout (for huge files)
 -Z              guess size of binary program

rasm2

$ rasm2 -h
Usage: rasm2 [-ACdDehLBvw] [-a arch] [-b bits] [-o addr] [-s syntax]
             [-f file] [-F fil:ter] [-i skip] [-l len] 'code'|hex|-
 -a [arch]    Set architecture to assemble/disassemble (see -L)
 -A           Show Analysis information from given hexpairs
 -b [bits]    Set cpu register size (8, 16, 32, 64) (RASM2_BITS)
 -c [cpu]     Select specific CPU (depends on arch)
 -C           Output in C format
 -d, -D       Disassemble from hexpair bytes (-D show hexpairs)
 -e           Use big endian instead of little endian
 -E           Display ESIL expression (same input as in -d)
 -f [file]    Read data from file
 -F [in:out]  Specify input and/or output filters (att2intel, x86.pseudo, ...)
 -h, -hh      Show this help, -hh for long
 -i [len]     ignore/skip N bytes of the input buffer
 -k [kernel]  Select operating system (linux, windows, darwin, ..)
 -l [len]     Input/Output length
 -L           List Asm plugins: (a=asm, d=disasm, A=analyze, e=ESIL)
 -o [offset]  Set start address for code (default 0)
 -O [file]    Output file name (rasm2 -Bf a.asm -O a)
 -p           Run SPP over input for assembly
 -s [syntax]  Select syntax (intel, att)
 -B           Binary input/output (-l is mandatory for binary input)
 -v           Show version information
 -w           What's this instruction for? describe opcode
 -q           quiet mode

rahash2

$ rahash2 -h
Usage: rahash2 [-rBhLkv] [-b S] [-a A] [-c H] [-E A] [-s S] [-f O] [-t O] [file] ...
 -a algo     comma separated list of algorithms (default is 'sha256')
 -b bsize    specify the size of the block (instead of full file)
 -B          show per-block hash
 -c hash     compare with this hash
 -e          swap endian (use little endian)
 -E algo     encrypt. Use -S to set key and -I to set IV
 -D algo     decrypt. Use -S to set key and -I to set IV
 -f from     start hashing at given address
 -i num      repeat hash N iterations
 -I iv       use give initialization vector (IV) (hexa or s:string)
 -S seed     use given seed (hexa or s:string) use ^ to prefix (key for -E)
             (- will slurp the key from stdin, the @ prefix points to a file
 -k          show hash using the openssh's randomkey algorithm
 -q          run in quiet mode (-qq to show only the hash)
 -L          list all available algorithms (see -a)
 -r          output radare commands
 -s string   hash this string instead of files
 -t to       stop hashing at given address
 -x hexstr   hash this hexpair string instead of files
 -v          show version information

radiff2

$ radiff2 -h
Usage: radiff2 [-abcCdjrspOxuUvV] [-A[A]] [-g sym] [-t %] [file] [file]
  -a [arch]  specify architecture plugin to use (x86, arm, ..)
  -A [-A]    run aaa or aaaa after loading each binary (see -C)
  -b [bits]  specify register size for arch (16 (thumb), 32, 64, ..)
  -c         count of changes
  -C         graphdiff code (columns: off-A, match-ratio, off-B) (see -A)
  -d         use delta diffing
  -D         show disasm instead of hexpairs
  -e [k=v]   set eval config var value for all RCore instances
  -g [sym|off1,off2]   graph diff of given symbol, or between two offsets
  -G [cmd]   run an r2 command on every RCore instance created
  -i         diff imports of target files (see -u, -U and -z)
  -j         output in json format
  -n         print bare addresses only (diff.bare=1)
  -O         code diffing with opcode bytes only
  -p         use physical addressing (io.va=0)
  -q         quiet mode (disable colors, reduce output)
  -r         output in radare commands
  -s         compute text distance
  -ss        compute text distance (using levenstein algorithm)
  -S [name]  sort code diff (name, namelen, addr, size, type, dist) (only for -C or -g)
  -t [0-100] set threshold for code diff (default is 70%)
  -x         show two column hexdump diffing
  -u         unified output (---+++)
  -U         unified output using system 'diff'
  -v         show version information
  -V         be verbose (current only for -s)
  -z         diff on extracted strings

rafind2

$ rafind2 -h
Usage: rafind2 [-mXnzZhv] [-a align] [-b sz] [-f/t from/to] [-[m|s|S|e] str] [-x hex] file ..
 -a [align] only accept aligned hits
 -b [size]  set block size
 -e [regex] search for regular expression string matches
 -f [from]  start searching from address 'from'
 -h         show this help
 -m         magic search, file-type carver
 -M [str]   set a binary mask to be applied on keywords
 -n         do not stop on read errors
 -r         print using radare commands
 -s [str]   search for a specific string (can be used multiple times)
 -S [str]   search for a specific wide string (can be used multiple times)
 -t [to]    stop search at address 'to'
 -v         print version and exit
 -x [hex]   search for hexpair string (909090) (can be used multiple times)
 -X         show hexdump of search results
 -z         search for zero-terminated strings
 -Z         show string found on each search hit

ragg2

$ ragg2 -h
Usage: ragg2 [-FOLsrxhvz] [-a arch] [-b bits] [-k os] [-o file] [-I path]
             [-i sc] [-e enc] [-B hex] [-c k=v] [-C file] [-p pad] [-q off]
             [-q off] [-dDw off:hex] file|f.asm|-
 -a [arch]       select architecture (x86, mips, arm)
 -b [bits]       register size (32, 64, ..)
 -B [hexpairs]   append some hexpair bytes
 -c [k=v]        set configuration options
 -C [file]       append contents of file
 -d [off:dword]  patch dword (4 bytes) at given offset
 -D [off:qword]  patch qword (8 bytes) at given offset
 -e [encoder]    use specific encoder. see -L
 -f [format]     output format (raw, pe, elf, mach0)
 -F              output native format (osx=mach0, linux=elf, ..)
 -h              show this help
 -i [shellcode]  include shellcode plugin, uses options. see -L
 -I [path]       add include path
 -k [os]         operating system's kernel (linux,bsd,osx,w32)
 -L              list all plugins (shellcodes and encoders)
 -n [dword]      append 32bit number (4 bytes)
 -N [dword]      append 64bit number (8 bytes)
 -o [file]       output file
 -O              use default output file (filename without extension or a.out)
 -p [padding]    add padding after compilation (padding=n10s32)
                 ntas : begin nop, trap, 'a', sequence
                 NTAS : same as above, but at the end
 -P [size]       prepend debruijn pattern
 -q [fragment]   debruijn pattern offset
 -r              show raw bytes instead of hexpairs
 -s              show assembler
 -v              show version
 -w [off:hex]    patch hexpairs at given offset
 -x              execute
 -z              output in C string syntax

rarun2

$ rarun2 -h
Usage: rarun2 -v|-t|script.rr2 [directive ..]

rax2

$ rax2 -h
Usage: rax2 [options] [expr ...]
  =[base]                 ;  rax2 =10 0x46 -> output in base 10
  int   ->  hex           ;  rax2 10
  hex   ->  int           ;  rax2 0xa
  -int  ->  hex           ;  rax2 -77
  -hex  ->  int           ;  rax2 0xffffffb3
  int   ->  bin           ;  rax2 b30
  int   ->  ternary       ;  rax2 t42
  bin   ->  int           ;  rax2 1010d
  float ->  hex           ;  rax2 3.33f
  hex   ->  float         ;  rax2 Fx40551ed8
  oct   ->  hex           ;  rax2 35o
  hex   ->  oct           ;  rax2 Ox12 (O is a letter)
  bin   ->  hex           ;  rax2 1100011b
  hex   ->  bin           ;  rax2 Bx63
  hex   ->  ternary       ;  rax2 Tx23
  raw   ->  hex           ;  rax2 -S < /binfile
  hex   ->  raw           ;  rax2 -s 414141
  -b    bin -> str        ;  rax2 -b 01000101 01110110
  -B    str -> bin        ;  rax2 -B hello
  -d    force integer     ;  rax2 -d 3 -> 3 instead of 0x3
  -e    swap endianness   ;  rax2 -e 0x33
  -D    base64 decode     ;
  -E    base64 encode     ;
  -f    floating point    ;  rax2 -f 6.3+2.1
  -F    stdin slurp C hex ;  rax2 -F < shellcode.c
  -h    help              ;  rax2 -h
  -k    keep base         ;  rax2 -k 33+3 -> 36
  -K    randomart         ;  rax2 -K 0x34 1020304050
  -n    binary number     ;  rax2 -n 0x1234 # 34120000
  -N    binary number     ;  rax2 -N 0x1234 # \x34\x12\x00\x00
  -r    r2 style output   ;  rax2 -r 0x1234
  -s    hexstr -> raw     ;  rax2 -s 43 4a 50
  -S    raw -> hexstr     ;  rax2 -S < /bin/ls > ls.hex
  -t    tstamp -> str     ;  rax2 -t 1234567890
  -x    hash string       ;  rax2 -x linux osx
  -u    units             ;  rax2 -u 389289238 # 317.0M
  -w    signed word       ;  rax2 -w 16 0xffff
  -v    version           ;  rax2 -v

在 CTF 中的运用

更多资源

• The radare2 book
• Radare2 intro