├── README.md
└── zju-web-auth.sh


/README.md:
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 1 | # 使用方式
 2 | 
 3 | 
 4 | ## 依赖
 5 | 此脚本只依赖如下命令。一般来说，即使是Openwrt都会自带这些命令：
 6 | 
 7 | `curl echo openssl awk shuf sed`
 8 | 
 9 | ## 登录
10 | `./zju-web-auth.sh 账号 密码`
11 | 
12 | 若登录成功，脚本将打印`[Login Successful]`；若已经登录，脚本将打印`[Already Online]`；若登录失败，脚本将打印请求结果。
13 | ## 退出
14 | `./zju-web-auth.sh logout`
15 | 
16 | 若退出成功，脚本将打印`logout_ok`
17 | ## 交互式操作
18 | `./zju-web-auth.sh`
19 | 
20 | 然后根据提示输入指令、账号和密码。
21 | 


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/zju-web-auth.sh:
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  1 | #!/bin/bash
  2 | 
  3 | _PADCHAR="="
  4 | _ALPHA="LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA"
  5 | INIT_URL="https://net.zju.edu.cn/"
  6 | GET_CHALLENGE_API="https://net.zju.edu.cn/cgi-bin/get_challenge"
  7 | SRUN_PORTAL_API="https://net.zju.edu.cn/cgi-bin/srun_portal"
  8 | N='200'
  9 | TYPE='1'
 10 | ENC="srun_bx1"
 11 | 
 12 | function ordat() {
 13 |     local msg="$1"
 14 |     local idx="$2"
 15 |     if [[ ${#msg} -gt idx ]]; then
 16 |         printf "%d" "'${msg:$idx:1}"
 17 |     else
 18 |         echo 0
 19 |     fi
 20 | }
 21 | 
 22 | function chr() {
 23 |   printf \\$(printf '%03o' $1)
 24 | }
 25 | 
 26 | function sencode() {
 27 |     local msg="$1"
 28 |     local key="$2"
 29 |     local l=${#msg}
 30 |     local pwd=()
 31 |     for ((i=0; i<l; i+=4)); do
 32 |         pwd+=($(($(ordat "$msg" "$i") + $(ordat "$msg" $((i+1))) * 256 + $(ordat "$msg" $((i+2))) * 65536 + $(ordat "$msg" $((i+3))) * 16777216)))
 33 |         true
 34 |     done
 35 |     if [[ "$key" == "true" ]]; then
 36 |         pwd+=($l)
 37 |     fi
 38 |     echo -n "${pwd[@]}"
 39 | }
 40 | 
 41 | function lencode() {
 42 |     local msg=($@)
 43 |     local l=${#msg[@]}
 44 |     local output=()
 45 |     for ((i=0; i<l; i++)); do
 46 |         output+=($((msg[$i] & 0xff)))
 47 |         output+=($((msg[$i] >> 8 & 0xff)))
 48 |         output+=($((msg[$i] >> 16 & 0xff)))
 49 |         output+=($((msg[$i] >> 24 & 0xff)))
 50 |     done
 51 |     echo -n "${output[@]}"
 52 | }
 53 | 
 54 | function get_xencode() {
 55 |     local msg="$1"
 56 |     local key="$2"
 57 |     if [[ -z "$msg" ]]; then
 58 |         echo -n ""
 59 |         return
 60 |     fi
 61 |     local pwd=($(sencode "$msg" true))
 62 |     local pwdk=($(sencode "$key" false))
 63 |     if [[ ${#pwdk[@]} -lt 4 ]]; then
 64 |         local n=${#pwdk[@]}
 65 |         for ((i=n; i<4; i++)); do
 66 |             pwdk+=(0)
 67 |         done
 68 |     fi
 69 |     local n=$(( ${#pwd[@]} - 1 ))
 70 |     local z=${pwd[$n]}
 71 |     local c=$((0x86014019 | 0x183639A0))
 72 |     local q=$((6 + 52 / (n + 1)))
 73 |     local d=0
 74 |     while ((q > 0)); do
 75 |         d=$(( d + c & (0x8CE0D9BF | 0x731F2640) ))
 76 |         local e=$((d >> 2 & 3))
 77 |         local p=0
 78 |         while ((p < n)); do
 79 |             local y=${pwd[$((p + 1))]}
 80 |             local m=$(( z >> 5 ^ y << 2 ))
 81 |             m=$(( m + ((y >> 3 ^ z << 4) ^ (d ^ y)) ))
 82 |             m=$(( m + (pwdk[$((p & 3)) ^ e] ^ z) ))
 83 |             pwd[$p]=$(( pwd[$p] + m & (0xEFB8D130 | 0x10472ECF) ))
 84 |             z=${pwd[$p]}
 85 |             ((p++))
 86 |         done
 87 |         local y=${pwd[0]}
 88 |         local m=$(( z >> 5 ^ y << 2 ))
 89 |         m=$(( m + ((y >> 3 ^ z << 4) ^ (d ^ y)) ))
 90 |         m=$(( m + (pwdk[$((p & 3)) ^ e] ^ z) ))
 91 |         pwd[$n]=$(( pwd[$n] + m & (0xBB390742 | 0x44C6F8BD) ))
 92 |         z=${pwd[$n]}
 93 |         ((q--))
 94 |     done
 95 |     lencode "${pwd[@]}"
 96 | }
 97 | 
 98 | function get_base64() {
 99 |   local s=($@)
100 |   local x=""
101 |   local imax=$(( ${#s[@]} - ${#s[@]} % 3 ))
102 |   if [[ ${#s[@]} -eq 0 ]]; then
103 |     echo ""
104 |     return
105 |   fi
106 |   for ((i=0; i<imax; i+=3)); do
107 |     local b10=$(( ${s[$i]} * 65536 + ${s[$((i + 1))]} * 256 + ${s[$((i + 2))]} ))
108 |     x="${x}${_ALPHA:$((b10 >> 18)):1}"
109 |     x="${x}${_ALPHA:$(((b10 >> 12) & 63)):1}"
110 |     x="${x}${_ALPHA:$(((b10 >> 6) & 63)):1}"
111 |     x="${x}${_ALPHA:$((b10 & 63)):1}"
112 |   done
113 |   local i=$imax
114 |   if [[ $((${#s[@]} - imax)) -eq 1 ]]; then
115 |     local b10=$(( ${s[$i]} << 16 ))
116 |     x="${x}${_ALPHA:$((b10 >> 18)):1}${_ALPHA:$(( (b10 >> 12) & 63 )):1}${_PADCHAR}${_PADCHAR}"
117 |   elif [[ $((${#s[@]} - imax)) -eq 2 ]]; then
118 |     local b10=$(( ${s[$i]} << 16 | ${s[$((i + 1))]} << 8 ))
119 |     x="${x}${_ALPHA:$((b10 >> 18)):1}${_ALPHA:$(( (b10 >> 12) & 63 )):1}${_ALPHA:$(( (b10 >> 6) & 63 )):1}${_PADCHAR}"
120 |   fi
121 |   echo $x
122 | }
123 | 
124 | function get_chksum() {
125 |     local chkstr="$token$username$token$hmd5$token$ac_id$token$ip$token$N$token$TYPE$token$i"
126 |     echo -n "$chkstr"
127 | }
128 | 
129 | function get_info() {
130 |     local info_temp="{\"username\":\"$username\",\"password\":\"$password\",\"ip\":\"$ip\",\"acid\":\"$ac_id\",\"enc_ver\":\"$ENC\"}"
131 |     echo "$info_temp" | sed 's/ //g'
132 | }
133 | 
134 | function init() {
135 |     echo 'Performing ZJU web auth...'
136 |     local init_res=$(curl -s -L $INIT_URL)
137 |     ac_id=$(echo "$init_res" | awk -F 'value=' '/ac_id/ {print $2}' | awk -F '"' '{print $2}')
138 |     ip=$(echo "$init_res" | awk -F 'value=' '/user_ip/ {print $2}' | awk -F '"' '{print $2}')
139 |     randnum=$(shuf -i 1-12345678901234567890 -n 1)
140 |     echo "ip: $ip"
141 | }
142 | 
143 | function get_token() {
144 |     local params="callback=jQuery${randnum}_$(($(date +%s%N)/1000000))&username=$username&ip=$ip&_=$(($(date +%s%N)/1000000))"
145 |     local res=$(curl -s -L "$GET_CHALLENGE_API?$params")
146 |     token=$(echo "$res" | awk -F 'challenge":"' '{print $2}' | awk -F '"' '{print $1}')
147 | }
148 | 
149 | function preprocess() {
150 |     i=$(get_info)
151 |     i="{SRBX1}$(get_base64 $(get_xencode "$i" "$token"))"
152 |     hmd5=$(echo -n "$password" | openssl dgst -md5 -hmac "$token" | awk '{print $2}')
153 |     chksum=$(echo -n "$(get_chksum)" | openssl dgst -sha1 | awk '{print $2}')
154 | }
155 | 
156 | function login() {
157 |     i=$(echo -n "$i" | sed 's/{/%7B/g' | sed 's/}/%7D/g' | sed 's/:/%3A/g' | sed 's/+/%2B/g' | sed 's/\//%2F/g' | sed 's/=/%3D/g' | sed 's/,/%2C/g' | sed 's/ /+/g')
158 |     local params="callback=jQuery${randnum}_$(($(date +%s%N)/1000000))&action=login&username=$username&password=%7BMD5%7D$hmd5&ac_id=$ac_id&ip=$ip&chksum=$chksum&info=$i&n=$N&type=$TYPE&os=windows+10&name=windows&double_stack=0&_=$(($(date +%s%N)/1000000))"
159 |     local res=$(curl -s -L "$SRUN_PORTAL_API?$params")
160 |     if [[ "$res" == *"E0000"* ]]; then
161 |         echo '[Login Successful]'
162 |     elif [[ "$res" == *"ip_already_online_error"* ]]; then
163 |         echo '[Already Online]'
164 |     else
165 |         echo '[Login Failed]'
166 |         echo "Response: $res"
167 |     fi
168 | }
169 | 
170 | function logout() {
171 |     local params="action=logout"
172 |     local res=$(curl -s "$SRUN_PORTAL_API?$params")
173 |     echo "$res"
174 | }
175 | 
176 | # Main execution
177 | if [[ "$1" == 'logout' ]]; then
178 |     logout
179 |     exit 0
180 | elif [[ "$1" != "" ]]; then
181 |     username="$1"
182 |     password="$2"
183 | else
184 |     read -p "login/logout: " op
185 |     if [[ "$op" == "logout" ]]; then
186 |         logout
187 |         exit 0
188 |     fi
189 |     read -p 'username: ' username
190 |     read -s -p 'password: ' password
191 |     echo ""
192 | fi
193 | 
194 | init
195 | get_token
196 | preprocess
197 | login
198 | 


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