CTF-All-In-One/doc/2.2.1_radare2.md
2018-08-05 17:43:10 +08:00

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2.2.1 Radare2

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

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

更新

$ ./sys/install.sh

卸载

$ make uninstall
$ make purge

命令行使用方法

Radare2 在命令行下有一些小工具可供使用:

  • radare2十六进制编辑器和调试器的核心通常通过它进入交互式界面。
  • 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。
  • ragg2r_egg 的前端将高级语言编写的简单程序编译成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

参数很多,这里最重要是 file。如果你想 attach 到一个进程上,则使用 pid。常用参数如下:

  • -A:相当于在交互界面输入了 aaa
  • -c:运行 radare 命令。(r2 -A -q -c 'iI~pic' file
  • -d:调试二进制文件或进程。
  • -a,-b,-o:分别指定体系结构、位数和操作系统,通常是自动的,但也可以手动指定。
  • -w:使用可写模式打开。

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

当我们拿到一个二进制文件时,第一步就是获取关于它的基本信息,这时候就可以使用 rabin2。rabin2 可以获取包括 ELF、PE、Mach-O、Java CLASS 文件的区段、头信息、导入导出表、数据段字符串、入口点等信息,并且支持多种格式的输出。

下面介绍一些常见的用法:(我还会列出其他实现类似功能工具的用法,你可以对比一下它们的输出)

  • -I:最常用的参数,它可以打印出二进制文件信息,其中我们需要重点关注其使用的安全防护技术,如 canary、pic、nx 等。(filechekcsec -f
  • -e得到二进制文件的入口点。readelf -h`
  • -i获得导入符号表RLT中的偏移等。readelf -r
  • -E:获得全局导出符号表。
  • -s:获得符号表。(readelf -s
  • -l:获得二进制文件使用到的动态链接库。(ldd
  • -z:从 ELF 文件的 .rodare 段或 PE 文件的 .text 中获得字符串。(strings -d
  • -S:获得完整的段信息。(readelf -S
  • -c:列出所有类,在分析 Java 程序是很有用。

最后还要提到的一个参数 -r,它可以将我们得到的信息以 radare2 可读的形式输出,在后续的分析中可以将这样格式的信息输入 radare2这是非常有用的。

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

rasm2 是一个内联汇编、反汇编程序。它的主要功能是获取给定机器指令操作码对应的字节。

下面是一些重要的参数:

  • -L列出目标体系结构所支持的插件输出中的第一列说明了插件提供的功能a=asm, d=disasm, A=analyze, e=ESIL
  • -a:知道插件的名字后,就可以使用 -a` 来进行设置。
  • -b设置CPU寄存器的位数。
  • -d:反汇编十六进制对字符串。
  • -D:反汇编并显示十六进制对和操作码。
  • -C:汇编后以 C 语言风格输出。
  • -f:从文件中读入汇编代码。

例子:

$ rasm2 -a x86 -b 32 'mov eax,30'
b81e000000
$ rasm2 -a x86 -b 32 'mov eax,30' -C
"\xb8\x1e\x00\x00\x00"

$ rasm2 -d b81e000000
mov eax, 0x1e
$ rasm2 -D b81e000000
0x00000000   5               b81e000000  mov eax, 0x1e
$ rasm2 -a x86 -b 32 -d 'b81e000000'
mov eax, 0x1e

$ cat a.asm
mov eax,30
$ rasm2 -f a.asm
b81e000000

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

rahash2 用于计算检验和,支持字节流、文件、字符串等形式和多种算法。

重要参数:

  • -a:指定算法。默认为 sha256如果指定为 all则使用所有算法。
  • -b:指定块的大小(而不是整个文件)
  • -B:打印处每个块的哈希
  • -s:指定字符串(而不是文件)
  • -a entropy:显示每个块的熵(-B -b 512 -a entropy

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

radiff2 是一个基于偏移的比较工具。

重要参数:

  • -s:计算文本距离并得到相似度。
  • AC:这两个参数通常一起使用,从函数的角度进行比较。
  • -g:得到给定的符号或两个偏移的图像对比。
    • 如:radiff2 -g main a.out b.out | xdot -需要安装xdot
  • -c:计算不同点的数量。

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

rafind2 用于在二进制文件中查找字符模式。

重要参数:

  • -s:查找特定字符串。
  • -e:使用正则匹配。
  • -z:搜索以\0结束的字符串。
  • -x:查找十六进制字符串。

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

ragg2 可以将高级语言编写的简单程序编译成 x86、x86-64 或 ARM 的二进制文件。

重要参数:

  • -a:设置体系结构。
  • -b:设置体系结构位数(32/64)。
  • -P:生成某种模式的字符串,常用于输入到某程序中并寻找溢出点。
  • -r:使用原始字符而不是十六进制对。
    • ragg2 -P 50 -r`
  • -i:生成指定的 shellcode。查看 -L
    • ragg2 -a x86 -b 32 -i exec
  • -e:使用指定的编码器。查看 -L

rarun2

$ rarun2 -h
Usage: rarun2 -v|-t|script.rr2 [directive ..]
program=/bin/ls
arg1=/bin
# arg2=hello
# arg3="hello\nworld"
# arg4=:048490184058104849
# arg5=:!ragg2 -p n50 -d 10:0x8048123
# arg6=@arg.txt
# arg7=@300@ABCD # 300 chars filled with ABCD pattern
# system=r2 -
# aslr=no
setenv=FOO=BAR
# unsetenv=FOO
# clearenv=true
# envfile=environ.txt
timeout=3
# timeoutsig=SIGTERM # or 15
# connect=localhost:8080
# listen=8080
# pty=false
# fork=true
# bits=32
# pid=0
# pidfile=/tmp/foo.pid
# #sleep=0
# #maxfd=0
# #execve=false
# #maxproc=0
# #maxstack=0
# #core=false
# #stdio=blah.txt
# #stderr=foo.txt
# stdout=foo.txt
# stdin=input.txt # or !program to redirect input to another program
# input=input.txt
# chdir=/
# chroot=/mnt/chroot
# libpath=$PWD:/tmp/lib
# r2preload=yes
# preload=/lib/libfoo.so
# setuid=2000
# seteuid=2000
# setgid=2001
# setegid=2001
# nice=5

rarun2 是一个可以使用不同环境、参数、标准输入、权限和文件描述符的启动器。

常用的参数设置:

  • program
  • arg1, arg2,...
  • setenv
  • stdin, stdout

例子:

  • rarun2 program=a.out arg1=$(ragg2 -P 300 -r)
  • rarun2 program=a.out stdin=$(python a.py)

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

rax2 是一个格式转换工具,在二进制、八进制、十六进制数字和字符串之间进行转换。

重要参数:

  • -e:交换字节顺序
  • -s:十六进制->字符
  • -S:字符->十六进制
  • -D, -Ebase64 解码和编码

交互式使用方法

当我们进入到 Radare2 的交互式界面后,就可以使用交互式命令进行操作。

输入 ? 可以获得帮助信息,由于命令太多,我们只会重点介绍一些常用命令:

[0x00000000]> ?
Usage: [.][times][cmd][~grep][@[@iter]addr!size][|>pipe] ; ...
Append '?' to any char command to get detailed help
Prefix with number to repeat command N times (f.ex: 3x)
|%var =valueAlias for 'env' command
| *[?] off[=[0x]value]    Pointer read/write data/values (see ?v, wx, wv)
| (macro arg0 arg1)       Manage scripting macros
| .[?] [-|(m)|f|!sh|cmd]  Define macro or load r2, cparse or rlang file
| =[?] [cmd]              Send/Listen for Remote Commands (rap://, http://, <fd>)
| /[?]                    Search for bytes, regexps, patterns, ..
| ![?] [cmd]              Run given command as in system(3)
| #[?] !lang [..]         Hashbang to run an rlang script
| a[?]                    Analysis commands
| b[?]                    Display or change the block size
| c[?] [arg]              Compare block with given data
| C[?]                    Code metadata (comments, format, hints, ..)
| d[?]                    Debugger commands
| e[?] [a[=b]]            List/get/set config evaluable vars
| f[?] [name][sz][at]     Add flag at current address
| g[?] [arg]              Generate shellcodes with r_egg
| i[?] [file]             Get info about opened file from r_bin
| k[?] [sdb-query]        Run sdb-query. see k? for help, 'k *', 'k **' ...
| L[?] [-] [plugin]       list, unload load r2 plugins
| m[?]                    Mountpoints commands
| o[?] [file] ([offset])  Open file at optional address
| p[?] [len]              Print current block with format and length
| P[?]                    Project management utilities
| q[?] [ret]              Quit program with a return value
| r[?] [len]              Resize file
| s[?] [addr]             Seek to address (also for '0x', '0x1' == 's 0x1')
| S[?]                    Io section manipulation information
| t[?]                    Types, noreturn, signatures, C parser and more
| T[?] [-] [num|msg]      Text log utility
| u[?]                    uname/undo seek/write
| V                       Enter visual mode (V! = panels, VV = fcngraph, VVV = callgraph)
| w[?] [str]              Multiple write operations
| x[?] [len]              Alias for 'px' (print hexadecimal)
| y[?] [len] [[[@]addr    Yank/paste bytes from/to memory
| z[?]                    Zignatures management
| ?[??][expr]             Help or evaluate math expression
| ?$?                     Show available '$' variables and aliases
| ?@?                     Misc help for '@' (seek), '~' (grep) (see ~??)
| ?:?                     List and manage core plugins

于是我们知道了 Radare2 交互命令的一般格式,如下所示:

[.][times][cmd][~grep][@[@iter]addr!size][|>pipe] ; ...

如果你对 *nix shell, sed, awk 等比较熟悉的话,也可以帮助你很快掌握 radare2 命令。

  • 在任意字符命令后面加上 ? 可以获得关于该命令更多的细节。如 a?p?!?@?
  • 当命令以数字开头时表示重复运行的次数。如 3x
  • ! 单独使用可以显示命令使用历史记录。
  • ; 是命令分隔符,可以在一行上运行多个命令。如 px 10; pd 20
  • .. 重复运行上一条命令,使用回车键也一样。
  • / 用于在文件中进行搜索操作。
  • ! 开头可以运行 shell 命令。用法:!<cmd>
    • !ls
  • | 是管道符。用法:<r2command> | <program|H|>
    • pd | less
  • ~ 用于文本比配grep。用法[command]~[modifier][word,word][endmodifier][[column]][:line]
    • i~:0 显示 i 输出的第一行
    • pd~mov,eax 反汇编并匹配 mov 或 eax 所在行
    • pi~mov&eax 匹配 mov 和 eax 都有的行
    • i~0x400$ 匹配以 0x400 结尾的行
  • ??? 可以获得以 ? 开头的命令的细节
    • ? 可以做各种进制和格式的快速转换。如 ? 1234
    • ?p vaddr 获得虚拟地址 vaddr 的物理地址
    • ?P paddr 获得物理地址 paddr 的虚拟地址
    • ?v 以十六进制的形式显示某数学表达式的结果。如 ?v eip-0x804800
    • ?l str 获得 str 的长度,结果被临时保存,使用 ?v 可输出结果。
  • @@ foreach 迭代器,在列出的偏移处重复执行命令。
    • wx ff @@ 10 20 30 在偏移 10、20、30 处写入 ff
    • p8 4 @@ fcn.* 打印处每个函数的头 4 个字节
  • ?$? 可以显示表达式所使用变量的帮助信息。用法:?v [$.]
    • $$ 是当前所处的虚拟地址
    • $? 是最后一个运算的值
    • $s 文件大小
    • $b 块大小
    • $l 操作码长度
    • $j 跳转地址。当 $$ 处是一个类似 jmp 的指令时,$j 中保存着将要跳转到的地址
    • $f 跳转失败地址。即当前跳转没有生效,$f 中保存下一条指令的地址
    • $m 操作码内存引用。如:mov eax,[0x10] => 0x10
  • e 用于进行配置信息的修改
    • e asm.bytes=false 关闭指令 raw bytes 的显示

默认情况下,执行的每条命令都有一个参考点,通常是内存中的当前位置,由命令前的十六进制数字指示。任何的打印、写入或分析命令都在当前位置执行。例如反汇编当前位置的一条指令:

[0x00005060]> pd 1
            ;-- entry0:
            ;-- rip:
            0x00005060      31ed           xor ebp, ebp

block size 是在我们没有指定行数的时候使用的默认值,输入 b 即可看到,使用 b [num] 修改字节数,这时使用打印命令如 pd 时,将反汇编相应字节的指令。

[0x00005060]> b
0x100
[0x00005060]> b 10
[0x00005060]> b
0xa
[0x00005060]> pd
            ;-- entry0:
            ;-- rip:
            0x00005060      31ed           xor ebp, ebp
            0x00005062      4989d1         mov r9, rdx

分析analyze

所有与分析有关的命令都以 a 开头:

[0x00000000]> a?
|Usage: a[abdefFghoprxstc] [...]
| ab [hexpairs]    analyze bytes
| abb [len]        analyze N basic blocks in [len] (section.size by default)
| aa[?]            analyze all (fcns + bbs) (aa0 to avoid sub renaming)
| ac [cycles]      analyze which op could be executed in [cycles]
| ad[?]            analyze data trampoline (wip)
| ad [from] [to]   analyze data pointers to (from-to)
| ae[?] [expr]     analyze opcode eval expression (see ao)
| af[?]            analyze Functions
| aF               same as above, but using anal.depth=1
| ag[?] [options]  output Graphviz code
| ah[?]            analysis hints (force opcode size, ...)
| ai [addr]        address information (show perms, stack, heap, ...)
| ao[?] [len]      analyze Opcodes (or emulate it)
| aO               Analyze N instructions in M bytes
| ar[?]            like 'dr' but for the esil vm. (registers)
| ap               find prelude for current offset
| ax[?]            manage refs/xrefs (see also afx?)
| as[?] [num]      analyze syscall using dbg.reg
| at[?] [.]        analyze execution traces
| av[?] [.]        show vtables
[0x00000000]> aa?
|Usage: aa[0*?] # see also 'af' and 'afna'
| aa                  alias for 'af@@ sym.*;af@entry0;afva'
| aa*                 analyze all flags starting with sym. (af @@ sym.*)
| aaa[?]              autoname functions after aa (see afna)
| aab                 aab across io.sections.text
| aac [len]           analyze function calls (af @@ `pi len~call[1]`)
| aad [len]           analyze data references to code
| aae [len] ([addr])  analyze references with ESIL (optionally to address)
| aai[j]              show info of all analysis parameters
| aar[?] [len]        analyze len bytes of instructions for references
| aan                 autoname functions that either start with fcn.* or sym.func.*
| aas [len]           analyze symbols (af @@= `isq~[0]`)
| aat [len]           analyze all consecutive functions in section
| aaT [len]           analyze code after trap-sleds
| aap                 find and analyze function preludes
| aav [sat]           find values referencing a specific section or map
| aau [len]           list mem areas (larger than len bytes) not covered by functions
  • afl:列出所有函数。
  • axt [addr]:找到对给定地址的交叉引用。
  • af [addr]:当你发现某个地址处有一个函数,但是没有被分析出来的时候,可以使用该命令重新分析。

Flags

flag 用于将给定的偏移与名称相关联flag 被分为几个 flag spaces用于存放不同的 flag。

[0x00000000]> f?
|Usage: f [?] [flagname] # Manage offset-name flags
| f                        list flags (will only list flags from selected flagspaces)
| f?flagname               check if flag exists or not, See ?? and ?!
| f. [*[*]]                list local per-function flags (*) as r2 commands
| f.blah=$$+12             set local function label named 'blah'
| f*                       list flags in r commands
| f name 12 @ 33           set flag 'name' with length 12 at offset 33
| f name = 33              alias for 'f name @ 33' or 'f name 1 33'
| f name 12 33 [cmt]       same as above + optional comment
| f-.blah@fcn.foo          delete local label from function at current seek (also f.-)
| f--                      delete all flags and flagspaces (deinit)
| f+name 12 @ 33           like above but creates new one if doesnt exist
| f-name                   remove flag 'name'
| f-@addr                  remove flag at address expression
| f. fname                 list all local labels for the given function
| f= [glob]                list range bars graphics with flag offsets and sizes
| fa [name] [alias]        alias a flag to evaluate an expression
| fb [addr]                set base address for new flags
| fb [addr] [flag*]        move flags matching 'flag' to relative addr
| fc[?][name] [color]      set color for given flag
| fC [name] [cmt]          set comment for given flag
| fd addr                  return flag+delta
| fe-                      resets the enumerator counter
| fe [name]                create flag name.#num# enumerated flag. See fe?
| fi [size] | [from] [to]  show flags in current block or range
| fg                       bring visual mode to foreground
| fj                       list flags in JSON format
| fl (@[flag]) [size]      show or set flag length (size)
| fla [glob]               automatically compute the size of all flags matching glob
| fm addr                  move flag at current offset to new address
| fn                       list flags displaying the real name (demangled)
| fo                       show fortunes
| fr [old] [[new]]         rename flag (if no new flag current seek one is used)
| fR[?] [f] [t] [m]        relocate all flags matching f&~m 'f'rom, 't'o, 'm'ask
| fs[?]+-*                 manage flagspaces
| fS[on]                   sort flags by offset or name
| fV[*-] [nkey] [offset]   dump/restore visual marks (mK/'K)
| fx[d]                    show hexdump (or disasm) of flag:flagsize
| fz[?][name]              add named flag zone -name to delete. see fz?[name]

常见用法:

  • f flag_name @ addr:给地址 addr 创建一个 flag当不指定地址时则默认指定当前地址。

  • f-flag_name删除flag。

  • fs:管理命名空间。

    [0x00005060]> fs?
    |Usage: fs [*] [+-][flagspace|addr] # Manage flagspaces
    | fs            display flagspaces
    | fs*           display flagspaces as r2 commands
    | fsj           display flagspaces in JSON
    | fs *          select all flagspaces
    | fs flagspace  select flagspace or create if it doesn't exist
    | fs-flagspace  remove flagspace
    | fs-*          remove all flagspaces
    | fs+foo        push previous flagspace and set
    | fs-           pop to the previous flagspace
    | fs-.          remove the current flagspace
    | fsm [addr]    move flags at given address to the current flagspace
    | fss           display flagspaces stack
    | fss*          display flagspaces stack in r2 commands
    | fssj          display flagspaces stack in JSON
    | fsr newname   rename selected flagspace
    

定位seeking

使用 s 命令可以改变当前位置:

[0x00000000]> s?
|Usage: s  # Seek commands
| s                 Print current address
| s:pad             Print current address with N padded zeros (defaults to 8)
| s addr            Seek to address
| s-                Undo seek
| s- n              Seek n bytes backward
| s--               Seek blocksize bytes backward
| s+                Redo seek
| s+ n              Seek n bytes forward
| s++               Seek blocksize bytes forward
| s[j*=!]           List undo seek history (JSON, =list, *r2, !=names, s==)
| s/ DATA           Search for next occurrence of 'DATA'
| s/x 9091          Search for next occurrence of \x90\x91
| s.hexoff          Seek honoring a base from core->offset
| sa [[+-]a] [asz]  Seek asz (or bsize) aligned to addr
| sb                Seek aligned to bb start
| sC[?] string      Seek to comment matching given string
| sf                Seek to next function (f->addr+f->size)
| sf function       Seek to address of specified function
| sg/sG             Seek begin (sg) or end (sG) of section or file
| sl[?] [+-]line    Seek to line
| sn/sp             Seek to next/prev location, as specified by scr.nkey
| so [N]            Seek to N next opcode(s)
| sr pc             Seek to register
| ss                Seek silently (without adding an entry to the seek history)
  • s+,s-:重复或撤销。
  • s+ n,s- n:定位到当前位置向前或向后 n 字节的位置。
  • s/ DATA:定位到下一个出现 DATA 的位置。

信息information

[0x00000000]> i?
|Usage: i Get info from opened file (see rabin2's manpage)
| Output mode:
| '*'                Output in radare commands
| 'j'                Output in json
| 'q'                Simple quiet output
| Actions:
| i|ij               Show info of current file (in JSON)
| iA                 List archs
| ia                 Show all info (imports, exports, sections..)
| ib                 Reload the current buffer for setting of the bin (use once only)
| ic                 List classes, methods and fields
| iC                 Show signature info (entitlements, ...)
| id[?]              Debug information (source lines)
| iD lang sym        demangle symbolname for given language
| ie                 Entrypoint
| iE                 Exports (global symbols)
| ih                 Headers (alias for iH)
| iHH                Verbose Headers in raw text
| ii                 Imports
| iI                 Binary info
| ik [query]         Key-value database from RBinObject
| il                 Libraries
| iL [plugin]        List all RBin plugins loaded or plugin details
| im                 Show info about predefined memory allocation
| iM                 Show main address
| io [file]          Load info from file (or last opened) use bin.baddr
| ir                 Relocs
| iR                 Resources
| is                 Symbols
| iS [entropy,sha1]  Sections (choose which hash algorithm to use)
| iV                 Display file version info
| iz|izj             Strings in data sections (in JSON/Base64)
| izz                Search for Strings in the whole binary
| iZ                 Guess size of binary program

i 系列命令用于获取文件的各种信息,这时配合上 ~ 命令来获得精确的输出,下面是一个类似 checksec 的输出:

[0x00005060]> iI ~relro,canary,nx,pic,rpath
canary   true
nx       true
pic      true
relro    full
rpath    NONE

~ 命令还有一些其他的用法,如获取某一行某一列等,另外使用 ~{} 可以使 json 的输出更好看:

[0x00005060]> ~?
|Usage: [command]~[modifier][word,word][endmodifier][[column]][:line]
modifier:
|  &            all words must match to grep the line
|  $[n]         sort numerically / alphabetically the Nth column
|  +            case insensitive grep (grep -i)
|  ^            words must be placed at the beginning of line
|  !            negate grep
|  ?            count number of matching lines
|  ?.           count number chars
|  ??           show this help message
|  :[s]-[e]     show lines s-e
|  ..           internal 'less'
|  ...          internal 'hud' (like V_)
|  {}           json indentation
|  {path}       json grep
|  {}..         less json indentation
| endmodifier:  
|  $            words must be placed at the end of line
| column:
|  [n]          show only column n
|  [n-m]        show column n to m
|  [n-]         show all columns starting from column n
|  [i,j,k]      show the columns i, j and k
| Examples:
|  i~:0         show first line of 'i' output
|  i~:-2        show first three lines of 'i' output
|  pd~mov       disasm and grep for mov
|  pi~[0]       show only opcode
|  i~0x400$     show lines ending with 0x400

打印print & 反汇编disassembling

[0x00000000]> p?
|Usage: p[=68abcdDfiImrstuxz] [arg|len] [@addr]
| p=[?][bep] [blks] [len] [blk]  show entropy/printable chars/chars bars
| p2 [len]                       8x8 2bpp-tiles
| p3 [file]                      print stereogram (3D)
| p6[de] [len]                   base64 decode/encode
| p8[?][j] [len]                 8bit hexpair list of bytes
| pa[edD] [arg]                  pa:assemble  pa[dD]:disasm or pae: esil from hexpairs
| pA[n_ops]                      show n_ops address and type
| p[b|B|xb] [len] ([skip])       bindump N bits skipping M
| pb[?] [n]                      bitstream of N bits
| pB[?] [n]                      bitstream of N bytes
| pc[?][p] [len]                 output C (or python) format
| pC[d] [rows]                   print disassembly in columns (see hex.cols and pdi)
| pd[?] [sz] [a] [b]             disassemble N opcodes (pd) or N bytes (pD)
| pf[?][.nam] [fmt]              print formatted data (pf.name, pf.name $<expr>)
| ph[?][=|hash] ([len])          calculate hash for a block
| p[iI][df] [len]                print N ops/bytes (f=func) (see pi? and pdi)
| pm[?] [magic]                  print libmagic data (see pm? and /m?)
| pr[?][glx] [len]               print N raw bytes (in lines or hexblocks, 'g'unzip)
| p[kK] [len]                    print key in randomart (K is for mosaic)
| ps[?][pwz] [len]               print pascal/wide/zero-terminated strings
| pt[?][dn] [len]                print different timestamps
| pu[?][w] [len]                 print N url encoded bytes (w=wide)
| pv[?][jh] [mode]               show variable/pointer/value in memory
| p-[?][jh] [mode]               bar|json|histogram blocks (mode: e?search.in)
| px[?][owq] [len]               hexdump of N bytes (o=octal, w=32bit, q=64bit)
| pz[?] [len]                    print zoom view (see pz? for help)
| pwd                            display current working directory

常用参数如下:

  • px:输出十六进制数、偏移和原始数据。后跟 o,w,q 时分别表示8位、32位和64位。
  • p8输出8位的字节流。
  • ps:输出字符串。

radare2 中反汇编操作是隐藏在打印操作中的,即使用 pd

[0x00000000]> pd?
|Usage: p[dD][ajbrfils] [sz] [arch] [bits] # Print Disassembly
| NOTE: len  parameter can be negative
| NOTE:      Pressing ENTER on empty command will repeat last pd command and also seek to end of disassembled range.
| pd N       disassemble N instructions
| pd -N      disassemble N instructions backward
| pD N       disassemble N bytes
| pda        disassemble all possible opcodes (byte per byte)
| pdb        disassemble basic block
| pdc        pseudo disassembler output in C-like syntax
| pdC        show comments found in N instructions
| pdk        disassemble all methods of a class
| pdj        disassemble to json
| pdr        recursive disassemble across the function graph
| pdf        disassemble function
| pdi        like 'pi', with offset and bytes
| pdl        show instruction sizes
| pds[?]     disassemble summary (strings, calls, jumps, refs) (see pdsf and pdfs)
| pdt        disassemble the debugger traces (see atd)

@addr 表示一个相对寻址,这里的 addr 可以是地址、符号名等,这个操作和 s 命令不同,它不会改变当前位置,当然即使使用类似 s @addr 的命令也不会改变当前位置。

[0x00005060]> pd 5 @ main
            ;-- main:
            ;-- section..text:
            0x00003620      4157           push r15                    ; section 13 va=0x00003620 pa=0x00003620 sz=75529 vsz=75529 rwx=--r-x .text
            0x00003622      4156           push r14
            0x00003624      4155           push r13
            0x00003626      4154           push r12
            0x00003628      55             push rbp
[0x00005060]> s @ main
0x3620
[0x00005060]> s 0x3620
[0x00003620]>

写入write

当你在打开 r2 时使用了参数 -w 时,才可以使用该命令,w 命令用于写入字节,它允许多种输入格式:

[0x00000000]> w?
|Usage: w[x] [str] [<file] [<<EOF] [@addr]
| w[1248][+-][n]       increment/decrement byte,word..
| w foobar             write string 'foobar'
| w0 [len]             write 'len' bytes with value 0x00
| w6[de] base64/hex    write base64 [d]ecoded or [e]ncoded string
| wa[?] push ebp       write opcode, separated by ';' (use '"' around the command)
| waf file             assemble file and write bytes
| wao[?] op            modify opcode (change conditional of jump. nop, etc)
| wA[?] r 0            alter/modify opcode at current seek (see wA?)
| wb 010203            fill current block with cyclic hexpairs
| wB[-]0xVALUE         set or unset bits with given value
| wc                   list all write changes
| wc[?][ir*?]          write cache undo/commit/reset/list (io.cache)
| wd [off] [n]         duplicate N bytes from offset at current seek (memcpy) (see y?)
| we[?] [nNsxX] [arg]  extend write operations (insert instead of replace)
| wf -|file            write contents of file at current offset
| wh r2                whereis/which shell command
| wm f0ff              set binary mask hexpair to be used as cyclic write mask
| wo[?] hex            write in block with operation. 'wo?' fmi
| wp[?] -|file         apply radare patch file. See wp? fmi
| wr 10                write 10 random bytes
| ws pstring           write 1 byte for length and then the string
| wt[f][?] file [sz]   write to file (from current seek, blocksize or sz bytes)
| wts host:port [sz]   send data to remote host:port via tcp://
| ww foobar            write wide string 'f\x00o\x00o\x00b\x00a\x00r\x00'
| wx[?][fs] 9090       write two intel nops (from wxfile or wxseek)
| wv[?] eip+34         write 32-64 bit value
| wz string            write zero terminated string (like w + \x00)

常见用法:

  • wa:写入操作码,如 wa jmp 0x8048320

  • wx:写入十六进制数。

  • wv写入32或64位的值。

  • wo:有很多子命令,用于将当前位置的值做运算后覆盖原值。

    [0x00005060]> wo?
    |Usage: wo[asmdxoArl24] [hexpairs] @ addr[!bsize]
    | wo[24aAdlmorwx]               without hexpair values, clipboard is used
    | wo2 [val]                     2=  2 byte endian swap
    | wo4 [val]                     4=  4 byte endian swap
    | woa [val]                     +=  addition (f.ex: woa 0102)
    | woA [val]                     &=  and
    | wod [val]                     /=  divide
    | woD[algo] [key] [IV]          decrypt current block with given algo and key
    | woe [from to] [step] [wsz=1]  ..  create sequence
    | woE [algo] [key] [IV]         encrypt current block with given algo and key
    | wol [val]                     <<= shift left
    | wom [val]                     *=  multiply
    | woo [val]                     |=  or
    | wop[DO] [arg]                 De Bruijn Patterns
    | wor [val]                     >>= shift right
    | woR                           random bytes (alias for 'wr $b')
    | wos [val]                     -=  substraction
    | wow [val]                     ==  write looped value (alias for 'wb')
    | wox [val]                     ^=  xor  (f.ex: wox 0x90)
    

调试debugging

在开启 r2 时使用参数 -d 即可开启调试模式,当然如果你已经加载了程序,可以使用命令 ood 重新开启调试。

[0x7f8363c75f30]> d?
|Usage: d # Debug commands
| db[?]                   Breakpoints commands
| dbt[?]                  Display backtrace based on dbg.btdepth and dbg.btalgo
| dc[?]                   Continue execution
| dd[?]                   File descriptors (!fd in r1)
| de[-sc] [rwx] [rm] [e]  Debug with ESIL (see de?)
| dg <file>               Generate a core-file (WIP)
| dH [handler]            Transplant process to a new handler
| di[?]                   Show debugger backend information (See dh)
| dk[?]                   List, send, get, set, signal handlers of child
| dL [handler]            List or set debugger handler
| dm[?]                   Show memory maps
| do[?]                   Open process (reload, alias for 'oo')
| doo[args]               Reopen in debugger mode with args (alias for 'ood')
| dp[?]                   List, attach to process or thread id
| dr[?]                   Cpu registers
| ds[?]                   Step, over, source line
| dt[?]                   Display instruction traces (dtr=reset)
| dw <pid>                Block prompt until pid dies
| dx[?]                   Inject and run code on target process (See gs)

视图模式

在调试时使用视图模式是十分有用的,因为你既可以查看程序当前的位置,也可以查看任何你想看的位置。输入 V 即可进入视图模式,按下 p/P 可在不同模式之间进行切换,按下 ? 即可查看帮助,想退出时按下 q

Visual mode help:
?        show this help
 ??       show the user-friendly hud
 $        toggle asm.pseudo
 %        in cursor mode finds matching pair, otherwise toggle autoblocksz
 @        redraw screen every 1s (multi-user view), in cursor set position
 !        enter into the visual panels mode
 _        enter the flag/comment/functions/.. hud (same as VF_)
 =        set cmd.vprompt (top row)
 |        set cmd.cprompt (right column)
 .        seek to program counter
 "        toggle the column mode (uses pC..)
 /        in cursor mode search in current block
 :cmd     run radare command
 ;[-]cmt  add/remove comment
 0        seek to beginning of current function
 [1-9]    follow jmp/call identified by shortcut (like ;[1])
 ,file    add a link to the text file
 /*+-[]   change block size, [] = resize hex.cols
 </>      seek aligned to block size (seek cursor in cursor mode)
 a/A      (a)ssemble code, visual (A)ssembler
 b        toggle breakpoint
 B        enumerate and inspect classes
 c/C      toggle (c)ursor and (C)olors
 d[f?]    define function, data, code, ..
 D        enter visual diff mode (set diff.from/to)
 e        edit eval configuration variables
 f/F      set/unset or browse flags. f- to unset, F to browse, ..
 gG       go seek to begin and end of file (0-$s)
 hjkl     move around (or HJKL) (left-down-up-right)
 i        insert hex or string (in hexdump) use tab to toggle
 mK/'K    mark/go to Key (any key)
 M        walk the mounted filesystems
 n/N      seek next/prev function/flag/hit (scr.nkey)
 o        go/seek to given offset
 O        toggle asm.esil
 p/P      rotate print modes (hex, disasm, debug, words, buf)
 q        back to radare shell
 r        refresh screen / in cursor mode browse comments
 R        randomize color palette (ecr)
 sS       step / step over
 t        browse types
 T        enter textlog chat console (TT)
 uU       undo/redo seek
 v        visual function/vars code analysis menu
 V        (V)iew graph using cmd.graph (agv?)
 wW       seek cursor to next/prev word
 xX       show xrefs/refs of current function from/to data/code
 yY       copy and paste selection
 z        fold/unfold comments in disassembly
 Z        toggle zoom mode
 Enter    follow address of jump/call
Function Keys: (See 'e key.'), defaults to:
  F2      toggle breakpoint
  F4      run to cursor
  F7      single step
  F8      step over
  F9      continue

视图模式下的命令和命令行模式下的命令有很大不同,下面列出几个,更多的命令请查看帮助:

  • o:定位到给定的偏移。
  • ;:添加注释。
  • V:查看图形。
  • ::运行 radare2 命令

Web 界面使用

Radare2 的 GUI 尚在开发中,但有一个 Web 界面可以使用,如果刚开始你不习惯命令行操作,可以输入下面的命令:

$ r2 -c=H [filename]

默认地址为 http://localhost:9090/,这样你就可以在 Web 中进行操作了,但是我强烈建议你强迫自己使用命令行的操作方式。

cutter GUI

cutter 是 r2 官方的 GUI已经在快速开发中基本功能已经有了喜欢界面操作的读者可以试一下请确保 r2 已经正确安装):

$ yaourt -S qt
$ git clone https://github.com/radareorg/cutter
$ cd cutter
$ mkdir build
$ cd build
$ qmake ../src
$ make

然后就可以运行了:

$ ./cutter

在 CTF 中的运用

更多资源