一、初始实现
1. 创建生成密码的函数
代码语言：javascript复制use test;
drop function if exists fn_GenerateStrongPassword;
delimiter //
create function fn_GenerateStrongPassword(length int)
returns varchar(255)
no sql
begin
declare allowedchars varchar(128) default 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()-_= []{}|;:,./?';
declare returnstr varchar(255) default '';
declare i int default 0;
while i < length do
set returnstr = concat(returnstr, substring(allowedchars, floor(1 rand() * 87), 1));
set i = i 1;
end while;
return returnstr;
end //
delimiter ;说明：
- 密码长度为入参。
- 从构成密码的 88 个预定义字符中随机取 16 个字符。
2. 批量生成密码，并用 MySQL 密码策略管理插件验证密码强度
validate_password 是 MySQL 默认的密码管理策略插件，可通过配置对用户密码长度、强度进行管理。
（1）安装密码验证插件
代码语言：javascript复制mysql> install plugin validate_password soname 'validate_password.so';
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show plugins;
--------------------------------- ---------- -------------------- ---------------------- ---------
| Name | Status | Type | Library | License |
--------------------------------- ---------- -------------------- ---------------------- ---------
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
...
| mysqlx_cache_cleaner | ACTIVE | AUDIT | NULL | GPL |
| validate_password | ACTIVE | VALIDATE PASSWORD | validate_password.so | GPL |
--------------------------------- ---------- -------------------- ---------------------- ---------
45 rows in set (0.00 sec)
mysql>（2）设置密码验证策略参数
代码语言：javascript复制mysql> show variables like 'validate_password%';
-------------------------------------- --------
| Variable_name | Value |
-------------------------------------- --------
| validate_password_check_user_name | ON |
| validate_password_dictionary_file | |
| validate_password_length | 8 |
| validate_password_mixed_case_count | 1 |
| validate_password_number_count | 1 |
| validate_password_policy | MEDIUM |
| validate_password_special_char_count | 1 |
-------------------------------------- --------
7 rows in set (0.00 sec)
mysql> set global validate_password_length=16;
Query OK, 0 rows affected (0.01 sec)
mysql> set global validate_password_policy=2;
Query OK, 0 rows affected (0.00 sec)
mysql>密码验证策略参数说明如下表：
参数 | 默认值 | 描述 |
|---|---|---|
validate_password_check_user_name | OFF | 设置为 ON 时表示能将密码设置为当前用户名 |
validate_password_dictionary_file | 用于检查密码的字典文件的文件名，默认为空。 | |
validate_password_length | 8 | 密码的最小长度 |
validate_password_mixed_case_count | 1 | 如果密码策略是中等或更强，validate_password要求密码具有的小写和大写字符的最小数量。 |
validate_password_number_count | 1 | 密码必须包含的数字个数。 |
validate_password_policy | MEDIUM | 密码强度检验等级，可以使用数值0、1、2或LOW、MEDIUM、STRONG来指定。 |
validate_password_special_char_count | 1 | 密码必须包含的特殊字符个数。 |
MySQL 密码强度等级定义如下表：
密码规则 | 强度得分 |
|---|---|
Length < 4 | 0 |
Length >= 4 and < validate_password_length | 25 |
Satisfies policy 1（LOW：只验证长度） | 50 |
Satisfies policy 2（MEDIUM：验证长度、数字、大小写字母、特殊字符） | 75 |
Satisfies policy 3（STRONG：验证长度、数字、大小写字母、特殊字符、字典文件） | 100 |
（3）批量生成密码并获取强度
代码语言：javascript复制mysql> select password, strength, if(r=1,n,'') n
-> from (select password, strength,
-> row_number() over (partition by strength order by password desc) n,
-> rank() over (partition by strength order by password) r
-> from (select password, validate_password_strength(password) strength
-> from (select test.fn_GenerateStrongPassword(16) password from mysql.help_topic limit 100) t
-> order by strength, password) t) t;
------------------ ---------- ----
| password | strength | n |
------------------ ---------- ----
| ,/bn@p0/&?3m(5(h | 50 | 13 |
| C.=IK]tLPhb-jd=n | 50 | |
| cfveQz/gH@Qu#?%) | 50 | |
| E(?W&x.eCQO=},hU | 50 | |
| H:YeTO%I@K}B=DiO | 50 | |
| Jc{NUCco!lRg}B=A | 50 | |
| Mkxar?F=nv$a*;C( | 50 | |
| OFLhjyj7clYQ0gwf | 50 | |
| rCeyxOVDet.paOAl | 50 | |
| sLUEn#t[#glN .wF | 50 | |
| TGCRVsKNd*}m?V#h | 50 | |
| tooBiSy[Vj{qsT:r | 50 | |
| Ulhd|U @eizri]pt | 50 | |
| _JQw&pTf%1%?6C5x | 100 | 87 |
| -#u|}*w 1Iq#oYIx | 100 | |
| -7{NXS)1U=7(d$5. | 100 | |
| ,{4PO}pnv#?##Oij | 100 | |
| !^@BJixcD1auoia! | 100 | |
| ?[ICQL7jQmt!]B|7 | 100 | |
| .Y.k6/]VbQFF0Mim | 100 | |
| (8/_x)y.cr|bARWx | 100 | |
| (rYx4F}O11tz^c(/ | 100 | |
| [S}cJ.ZgY88E0Os7 | 100 | |
| ]:fRz:[Wk:E:8Y W | 100 | |
| @fkK@I^0s:h2^fa( | 100 | |
| #6hPifc,07sg!F6t | 100 | |
| #AB4wFcgAAX.k8fw | 100 | |
| %9s:l*ZYk /C7G_i | 100 | |
| ^*6}1wQ6_sXooBgJ | 100 | |
| ^EMnK4:)x[Yz9Z Z | 100 | |
| =d2:|$/7Ja)h:PUw | 100 | |
| =moJVP$CG]EhH7ra | 100 | |
| |^js$jyh2&hglJ7l | 100 | |
| |99H[rGvk]f4cs?B | 100 | |
| 1.dyz3xMJ@L.V(L@ | 100 | |
| 15KmO}oh|Fcfu.n_ | 100 | |
| 1A@!K}D|3E{LOc%! | 100 | |
| 2l*14G;Zk--35H.8 | 100 | |
| 4^?2k#ETWtLSw^im | 100 | |
| 6PJ3]Zy2vFiI0CT3 | 100 | |
| 8r.wHmUy%b$$QrS/ | 100 | |
| 90K.3tvXh!DW$jyg | 100 | |
| 9I nqP-#p6^|xYg5 | 100 | |
| 9Z=Uh) =0;XdSIPp | 100 | |
| AF}P4$-|m}l:E{MT | 100 | |
| AMyi3=IJ=f#TJOkp | 100 | |
| bm6 HyxU)Rf-;rqC | 100 | |
| c#3[Vi_|h6fAB0X0 | 100 | |
| c w0#X5V$lJ3:)w_ | 100 | |
| C=z}9#Z^f?*b8G(: | 100 | |
| C$&0n5*c$6gH8vsA | 100 | |
| CKlFJ.3rkb0QDtg@ | 100 | |
| CMw,btdW62k%L]om | 100 | |
| D!W2LBzT!b|Yj)$C | 100 | |
| d/&?2fRBfG9CY}*x | 100 | |
| e),C%)-9/_x)x[2M | 100 | |
| e%9n9ceo8{O5(lu# | 100 | |
| f{Ea/}4Kq7*?W*Ao | 100 | |
| fEV60TQ $pZNPb5 | 100 | |
| GTTbUZHmXHvg2-Ew | 100 | |
| i^Z4JmRf**ZXeW3P | 100 | |
| Ip9;1rrHCPK4;%a# | 100 | |
| J_bU1MI5gJ_.A5C6 | 100 | |
| Jeehyl-^FQFE7BW_ | 100 | |
| k(8/=ChK[i]mf]vX | 100 | |
| L%VN4*igjBvA^.U% | 100 | |
| LVLRu80QAgOg.5C0 | 100 | |
| m{g9tf2[XpsS|fY9 | 100 | |
| M&16OHSKUM197xC- | 100 | |
| M%Pls68Jc[DeueSK | 100 | |
| md%@CMu=YA(kr2Q1 | 100 | |
| Mfa)g;NPa3gUKTDk | 100 | |
| N!t.rg&0p#s(L9s, | 100 | |
| nnBl9iI0DZ{$fc/- | 100 | |
| o,yV[^s#hq9}OYR& | 100 | |
| O*25Ida;4JlK@E1: | 100 | |
| q7)f=kb@1_INe;R9 | 100 | |
| qLY3Igs)P{j-_0b; | 100 | |
| Rh;Kxg1^f?&.QRf* | 100 | |
| s%q45D$!COHSKXZs | 100 | |
| s2Js-Uov!=lhd:2s | 100 | |
| STh f9zHfmSnu!]z | 100 | |
| t#ea]N13C^[h&7bg | 100 | |
| tFkTv6V%q7^[cV4T | 100 | |
| TGyyW.qbUZHmVB|7 | 100 | |
| TM4=Es/zR48TVnoF | 100 | |
| Ty P^N:IlP.NDC1e | 100 | |
| tZC)lr2OP/OK8o*Q | 100 | |
| U_46H,2suU;j@DRO | 100 | |
| u_Ule_j/1fSGDZ}& | 100 | |
| u$fdcb?|4JjDE#6j | 100 | |
| Ulf|LI9yB#^4 JM. | 100 | |
| V(L9p-1U[&Ao{aD9 | 100 | |
| V=31i9q[*EG(|sx9 | 100 | |
| wQ9.(jjs@a-mu$d. | 100 | |
| WT|i9p&J9vnb3hXZ | 100 | |
| x*nHOpQ|nbZ]0=ox | 100 | |
| X8#5cr{;,/eywLJ$ | 100 | |
| X9%#J*(3@#SDo(Vz | 100 | |
| Z|]5Y.iZ4Kq0;WaF | 100 | |
------------------ ---------- ----
100 rows in set (0.00 sec)
mysql> 从查询结果可以看到，有 13 个密码的强度得分为 50，原因是使用随机函数循环取得 16 个字符，有一定的概率不能完全覆盖到数字、大小写字母和特殊字符。如 Mkxar?F=nv$a*;C( 中就没有数字。经过多次测试，约有 10% - 20% 会出现这种情况。
二、改进实现
1. 创建生成密码的函数
代码语言：javascript复制use test;
drop function if exists fn_GenerateStrongPassword;
delimiter //
create function fn_GenerateStrongPassword(length int)
returns varchar(255)
no sql
begin
declare allowedchars varchar(128) default 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890!@#$%^&*()-_= []{}|;:,./?';
declare regexp_str varchar(128) default '^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[^a-zA-Z0-9])([a-zA-Z0-9]|[^a-zA-Z0-9]){16}$';
declare returnstr varchar(255) default '';
declare i int default 0;
add_loop:loop
set returnstr = '';
set i = 0;
-- 密码长度为入参
while i < length do
set returnstr = concat(returnstr, substring(allowedchars, floor(1 rand() * 87), 1));
set i = i 1;
end while;
-- 用正则函数判断强度，区分大小写
if not regexp_like(returnstr,regexp_str,'c') then
iterate add_loop; -- 不满足需求则重新生成密码
else
leave add_loop; -- 满足需求则退出循环
end if;
end loop add_loop;
-- 返回符合需求的密码
return returnstr;
end //
delimiter ;说明：
- 增加一层外循环，用于迭代生成一个完整的密码。
- 用正则函数 regexp_like 判断强度，不满足需求则重新生成密码，满足需求则退出循环，然后返回结果。注意要使用区分大小写的匹配类型（regexp_like 的第三个参数设置为 'c'）。
- 正则表达式说明：
- ^ 代表开始。
- (?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[^a-zA-Z0-9]) 用四个肯定顺序环视零宽断言对字符进行判定。
- (?=.*[a-z]) 判断小写字母是否存在。
- (?=.*[A-Z]) 判断大写字母是否存在。
- (?=.*[0-9]) 判断数字是否存在。
- (?=.*[^a-zA-Z0-9]) 判断特殊字符是否存在。
- ([a-zA-Z0-9]|[^a-zA-Z0-9]){16} 代表从两个 [] 内的字符中任取一个，共 16 位。
- $ 代表结尾。
2. 批量生成密码，并用 MySQL 密码策略管理插件验证密码强度
代码语言：javascript复制mysql> select password, strength, if(r=1,n,'') n
-> from (select password, strength,
-> row_number() over (partition by strength order by password desc) n,
-> rank() over (partition by strength order by password) r
-> from (select password, validate_password_strength(password) strength
-> from (select test.fn_GenerateStrongPassword(16) password from mysql.help_topic limit 100) t
-> order by strength, password) t) t;
------------------ ---------- -----
| password | strength | n |
------------------ ---------- -----
| _i:MJ7m9ciGX#?$& | 100 | 100 |
| _mpO*XO206rbQGI | 100 | |
| ,MFNr3T@gs)N)$yn | 100 | |
| ;OSoAal5=CfEU4X| | 100 | |
| ;rsN3^?4rh-]?xF? | 100 | |
| !a}U:m[:i7cn7[JJ | 100 | |
| !DSXB[KQnBjZ2D)g | 100 | |
| .;$.1k^UDhJ&!t,k | 100 | |
| .{1B$) _59TTe9zK | 100 | |
| (8,%|C=z|$.1k&XS | 100 | |
| (J2=KTHF3fMc&[eZ | 100 | |
| (Vx# mjhmM*5-u89 | 100 | |
| [MYXg9ug0yxV{=XA | 100 | |
| {1D=w#}D/{UaH{Hr | 100 | |
| }cJ;PZS%yl)@o5@0 | 100 | |
| @xoc5p|j$M.QXEdo | 100 | |
| *d*]bLkzj6,)u9*} | 100 | |
| &r3V_YHo9,@%3 LW | 100 | |
| #u||[ZC GxrsMY1v | 100 | |
| %1!({h!CRQ.IfiDG | 100 | |
| ^(9eo9?=Cewm,E A | 100 | |
| ^*6|3D_qJQqS,zZg | 100 | |
| ^v})FD1cDY]9)b4j | 100 | |
| @fiCE%^Z1vMN,Jp | 100 | |
| =Q[,k#DPFG%0wqmm | 100 | |
| |_N%K-{aD7C2i7cm | 100 | |
| |R@mTsO8chDNt&x. | 100 | |
| $,Y/re4fI*&WKM;H | 100 | |
| 0{JzyR4!6o_#mQd@ | 100 | |
| 26NyeJ[qA;*qTe8x | 100 | |
| 2l=_8 z O!r_32ob | 100 | |
| 2MGUYy8W@?$))6_v | 100 | |
| 3hTIH$1^c=qGAJlK | 100 | |
| 4_Dm0kO/T6#!G0K. | 100 | |
| 4 LYXk{mc!Ps7!Z& | 100 | |
| 48U3R6^{sB.[P#zw | 100 | |
| 5C0W79Ot!;T)Tpy{ | 100 | |
| 5V%s#iu[9=pBeCNy | 100 | |
| 7(d%8m5*hc{IAB7L | 100 | |
| 72eJ}B_w*qVnlr3T | 100 | |
| 8,$]ooDo=%xeOpP- | 100 | |
| 89LhlHTO^O/V&yfM | 100 | |
| 8gztx7V!:1pf&#CK | 100 | |
| 9/_u80QCp[=43rmk | 100 | |
| asbPBm^K(&Qg}C|4 | 100 | |
| bzMBwE,$]oqM2&f. | 100 | |
| c-g]uO6]R&P?X=YB | 100 | |
| C3n]aF^&181:,;(w | 100 | |
| CiSv0^%Sv80Py,,| | 100 | |
| dAJkFNoP]cOv-M9n | 100 | |
| DZ,/ezA7Ox,?iRu4 | 100 | |
| eBKmP|tC/:$:Q2Xa | 100 | |
| F{MPh.2oaQN(7:@^ | 100 | |
| fnYMRlpP=_47KkEF | 100 | |
| GCQO ,qg*^Ob7AS6 | 100 | |
| gRBdyz1n,D-mqTe7 | 100 | |
| gZ!-aV9-h:QXIvh8 | 100 | |
| hAvB)pL2^e{GmZT | 100 | |
| IhwbzLyi7ds};:{9 | 100 | |
| ijyhZ87yJs(M#K=c | 100 | |
| Ir_1OTrO@t|:am0l | 100 | |
| JOhe/$-]/tpu1D]M | 100 | |
| Jxn;tA_Dm8?;7X-O | 100 | |
| k0n9.*f|LFV52k^R | 100 | |
| k296q.zW|;]4U%r0 | 100 | |
| kFKc[Cbfxm;wP22v | 100 | |
| l3#-}j%Sw^imN(!n | 100 | |
| lGQzan^H1=Q]:i2& | 100 | |
| liis#hq0/^|z!8yC | 100 | |
| LK(&Rmu!}JAxMH4b | 100 | |
| MlDxC_u5U#hr%r@e | 100 | |
| ng]w3F]JDOAn-!gt | 100 | |
| nJY73i4]Ve2;(w-K | 100 | |
| nnAgM?3qd5iWQ&N{ | 100 | |
| o%EOx.cvnd@VUd1{ | 100 | |
| oQ}i%UFtdTP(3!9B | 100 | |
| pnv^ju_SbW#d,02? | 100 | |
| qL198ARXFjM e4dz | 100 | |
| r%t)K2_FxwQ8|Ynb | 100 | |
| RZNQje}NTu3Lzm [ | 100 | |
| S &EG_ja8Ke/^;D} | 100 | |
| s0]C. KTChL}y8V9 | 100 | |
| Smt51gX1A#%3(oJT | 100 | |
| Su5W*FI{A-w^kzgS | 100 | |
| T6$$TFuh@G8zKu} | 100 | |
| TJM?4trCds,n].sk | 100 | |
| TN6.=IG0L?!Y$b_q | 100 | |
| Tv6Y[9-f-:xQ39X& | 100 | |
| U4Y?wxYk__9|V/xG | 100 | |
| Uj,PSljlFI{C{Wf5 | 100 | |
| V!|Q6-qO%J#Rv#.4 | 100 | |
| VJJ-|j%Tz}0$7hI# | 100 | |
| vpnt9^)^K^184l$F | 100 | |
| W@:V #ht=ZHn1Yj^ | 100 | |
| W9*|vKG3an$zux7V | 100 | |
| X5T9]EgFV54tsJI% | 100 | |
| Y{(Bp;l[?D9MnK5/ | 100 | |
| yQZQ8,@*&XMVGug4 | 100 | |
| Z87ARWC,(nDuolly | 100 | |
| zcwsx!*-�4spu6 | 100 | |
------------------ ---------- -----
100 rows in set (0.01 sec)
mysql>从查询结果可以看到，所有 100 个密码强度得分都是 100，完全满足需求。因为不满足需求的情况不到 20%，所以不用担心外层循环陷入无休止的迭代中。当然必须指出，这版实现使用的是“判错重来”方式，会有不到 20% 的内层 while 循环做了无用功。
3. 卸载密码验证插件
代码语言：javascript复制mysql> uninstall plugin validate_password;
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> show plugins;
--------------------------------- ---------- -------------------- --------- ---------
| Name | Status | Type | Library | License |
--------------------------------- ---------- -------------------- --------- ---------
| binlog | ACTIVE | STORAGE ENGINE | NULL | GPL |
| mysql_native_password | ACTIVE | AUTHENTICATION | NULL | GPL |
...
| mysqlx | ACTIVE | DAEMON | NULL | GPL |
| mysqlx_cache_cleaner | ACTIVE | AUDIT | NULL | GPL |
--------------------------------- ---------- -------------------- --------- ---------
44 rows in set (0.00 sec)
mysql> show variables like 'validate_password%';
Empty set (0.00 sec)
mysql>
