FreeRADIUS Beginner's Guide

4. Authentication

认证过程:

• data link layer -> success -> network layer

认证协议:

• userpassword:
  • PAP
    • (password Authentication protocal)密码认证协议(p2p)
    • client -> (密码明文) -> NAS -> (加密密码) -> RADIUS SERVER
  • CHAP
    • (challenge-handshake authentication protocal)询问交互认证协议
    • NAS -> 重复发送随机间隔的 challenge -> user -> hash identifiter & 明文密码 -> NAS -> 加密密码 -> radius server
  • MS-CHAP
    • 微软chap协议,增强了功能,如用户修改密码,错误消息等.
    • chapv1 & chapv2
    • user -> 包含微软特殊字段NT-Response + 加密密码 -> NAS
    • EAP协议使用MS-CHAP

[root@localhost raddb]# vi /etc/raddb/users
添加以下2行
"tianfei" Cleartext-Password := "passgo"
        Reply-Message = "Hello, %{User-Name}"

[root@localhost raddb]# radtest tianfei passgo 127.0.0.1 100 testing123
Sent Access-Request Id 170 from 0.0.0.0:44098 to 127.0.0.1:1812 length 77
        User-Name = "tianfei"
        User-Password = "passgo"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 100
        Message-Authenticator = 0x00
        Cleartext-Password = "passgo"
Received Access-Reject Id 170 from 127.0.0.1:1812 to 0.0.0.0:0 length 20
(0) -: Expected Access-Accept got Access-Reject
[root@localhost raddb]# radtest tianfei passgo 127.0.0.1 100 testing123
Sent Access-Request Id 155 from 0.0.0.0:44387 to 127.0.0.1:1812 length 77
        User-Name = "tianfei"
        User-Password = "passgo"
        NAS-IP-Address = 127.0.0.1
        NAS-Port = 100
        Message-Authenticator = 0x00
        Cleartext-Password = "passgo"
Received Access-Accept Id 155 from 127.0.0.1:1812 to 0.0.0.0:0 length 36
        Reply-Message = "Hello, tianfei"

服务器日志输出

Ready to process requests

(0) Received Access-Request Id 155 from 127.0.0.1:44387 to 127.0.0.1:1812 length 77
(0)   User-Name = "tianfei"
(0)   User-Password = "passgo"
(0)   NAS-IP-Address = 127.0.0.1
(0)   NAS-Port = 100
(0)   Message-Authenticator = 0x5328ee7e1eaa61d3555baa241acb7582
(0) # Executing section authorize from file /etc/raddb/sites-enabled/default
(0)   authorize {
(0)     policy filter_username {
(0)       if (&User-Name) {
(0)       if (&User-Name)  -> TRUE
(0)       if (&User-Name)  {
(0)         if (&User-Name =~ / /) {
(0)         if (&User-Name =~ / /)  -> FALSE
(0)         if (&User-Name =~ /@[^@]*@/ ) {
(0)         if (&User-Name =~ /@[^@]*@/ )  -> FALSE
(0)         if (&User-Name =~ /\.\./ ) {
(0)         if (&User-Name =~ /\.\./ )  -> FALSE
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))  {
(0)         if ((&User-Name =~ /@/) && (&User-Name !~ /@(.+)\.(.+)$/))   -> FALSE
(0)         if (&User-Name =~ /\.$/)  {
(0)         if (&User-Name =~ /\.$/)   -> FALSE
(0)         if (&User-Name =~ /@\./)  {
(0)         if (&User-Name =~ /@\./)   -> FALSE
(0)       } # if (&User-Name)  = notfound
(0)     } # policy filter_username = notfound
(0)     [preprocess] = ok
(0)     [chap] = noop
(0)     [mschap] = noop
(0)     [digest] = noop
(0) suffix: Checking for suffix after "@"
(0) suffix: No '@' in User-Name = "tianfei", looking up realm NULL
(0) suffix: No such realm "NULL"
(0)     [suffix] = noop
(0) eap: No EAP-Message, not doing EAP
(0)     [eap] = noop
(0) files: users: Matched entry tianfei at line 1
(0) files: EXPAND Hello, %{User-Name}
(0) files:    --> Hello, tianfei
(0)     [files] = ok
(0)     [expiration] = noop
(0)     [logintime] = noop
(0)     [pap] = updated
(0)   } # authorize = updated
(0) Found Auth-Type = PAP
(0) # Executing group from file /etc/raddb/sites-enabled/default
(0)   Auth-Type PAP {
(0) pap: Login attempt with password
(0) pap: Comparing with "known good" Cleartext-Password
(0) pap: User authenticated successfully
(0)     [pap] = ok
(0)   } # Auth-Type PAP = ok
(0) # Executing section post-auth from file /etc/raddb/sites-enabled/default
(0)   post-auth {
(0)     update {
(0)       No attributes updated
(0)     } # update = noop
(0)     [exec] = noop
(0)     policy remove_reply_message_if_eap {
(0)       if (&reply:EAP-Message && &reply:Reply-Message) {
(0)       if (&reply:EAP-Message && &reply:Reply-Message)  -> FALSE
(0)       else {
(0)         [noop] = noop
(0)       } # else = noop
(0)     } # policy remove_reply_message_if_eap = noop
(0)   } # post-auth = noop
(0) Sent Access-Accept Id 155 from 127.0.0.1:1812 to 127.0.0.1:44387 length 0
(0)   Reply-Message = "Hello, tianfei"
(0) Finished request
Waking up in 4.9 seconds.
(0) Cleaning up request packet ID 155 with timestamp +6
Ready to process requests