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9: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
10: <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
11: <b>:</b> <A HREF="mpd29.html"><EM>Authentication, Authorization and Accounting (AAA)</EM></A>
12: <b>:</b> <EM>RADIUS</EM><BR>
13: <b>Previous:</b> <A HREF="mpd29.html"><EM>Authentication, Authorization and Accounting (AAA)</EM></A><BR>
14: <b>Next:</b> <A HREF="mpd31.html"><EM>External authentication</EM></A>
15:
16:
17: <HR NOSHADE>
18: <H2><A NAME="30"></A>4.10.1. RADIUS<A NAME="radius"></A></H2>
19:
20: <p>This chapter describes RADIUS authentication backend.
21: Mpd supports both user authentication and session accounting using RADIUS.
22: RADIUS-Accounting and RADIUS-Authentication are independant so it is possible
23: to use them in any combination.</p>
24: <p>All authentication methods are supported with RADIUS (PAP, CHAP, MS-CHAPv1,
25: MS-CHAPv2, EAP). Password changing is currently not supported.</p>
26: <p>All of these commands apply to the currently active link.</p>
27: <p>
28: <dl>
29:
30: <dt><b><code>set radius server <em>name</em> <em>secret</em> [ <em>auth-port</em> [ <em>acct-port</em> ]]</code></b><dd><p>Configure RADIUS server parameters. Multiple RADIUS servers may be configured
31: by repeating this command, and up to 10 servers may be specified.
32: If one of auth/acct ports specified as 0, it will not be used for requests
33: of that type.</p>
34:
35: <dt><b><code>set radius timeout <em>seconds</em></code></b><dd><p>Set the timeout for completion of RADIUS requests.</p>
36: <p>The default is 5 second.</p>
37:
38: <dt><b><code>set radius retries <em>#retries</em></code></b><dd><p>Set the number of retries for RADIUS requests.</p>
39: <p>The default is 3 retries.</p>
40:
41: <dt><b><code>set radius me <em>IP</em>|<em>ifname</em>|<em>hostname</em></code></b><dd><p>Send the given IP in the RAD_NAS_IP_ADDRESS attribute to the server.</p>
42:
43: <dt><b><code>set radius v6me <em>IPv6</em></code></b><dd><p>Send the given IP in the RAD_NAS_IPV6_ADDRESS attribute to the server.</p>
44:
45: <dt><b><code>set radius identifier <em>name</em></code></b><dd><p>Send the given name in the RAD_NAS_IDENTIFIER attribute to the server.
46: If not set the local hostname is used.</p>
47:
48: <dt><b><code>set radius enable message-authentic</code></b><dd><p>Adds the Message-Authenticator attribute to the RADIUS request.
49: The Message-Authenticator is an HMAC-MD5 checksum of the entire
50: Access-Request packet using the shared secret as the key. This
51: should protect the RADIUS server against online dictionary attacks.
52: This is mandatory when using the EAP-RADIUS-Proxy and it's implicitly
53: added to the request by Mpd.</p>
54:
55: <dt><b>RADIUS internals</b><dd>
56: <p>RADIUS attributes supported by mpd:
57: <pre>
58: N Name Access Accounting
59: Req Resp Req Resp
60: 1 User-Name + + + -
61: 2 User-Password + - - -
62: 3 CHAP-Password + - - -
63: 4 NAS-IP-Address + - + -
64: 5 NAS-Port + - + -
65: 6 Service-Type + - + -
66: 7 Framed-Protocol + - + -
67: 8 Framed-IP-Address - + + -
68: 9 Framed-IP-Netmask - + + -
69: 12 Framed-MTU - + - -
70: 13 Framed-Compression - + - -
71: 18 Reply-Message - + - -
72: 22 Framed-Route - + - -
73: 24 State + + + -
74: 25 Class - + + -
75: 27 Session-Timeout - + - -
76: 28 Idle-Timeout - + - -
77: 30 Called-Station-Id + - + -
78: 31 Calling-Station-Id + - + -
79: 32 NAS-Identifier + - + -
80: 40 Acct-Status-Type - - + -
81: 42 Acct-Input-Octets - - + -
82: 43 Acct-Output-Octets - - + -
83: 44 Acct-Session-Id + - + -
84: 45 Acct-Authentic - - + -
85: 46 Acct-Session-Time - - + -
86: 47 Acct-Input-Packets - - + -
87: 48 Acct-Output-Packets - - + -
88: 49 Acct-Terminate-Cause - - + -
89: 50 Acct-Multi-Session-Id - - + -
90: 51 Acct-Link-Count - - + -
91: 52 Acct-Input-Gigawords - - + -
92: 53 Acct-Output-Gigawords - - + -
93: 60 CHAP-Challenge + - - -
94: 61 NAS-Port-Type + - + -
95: 64 Tunnel-Type + - + -
96: 65 Tunnel-Medium-Type + - + -
97: 66 Tunnel-Client-Endpoint + - + -
98: 67 Tunnel-Server-Endpoint + - + -
99: 85 Acct-Interim-Interval - + - -
100: 87 NAS-Port-Id + - + -
101: 88 Framed-Pool - + - -
102: 90 Tunnel-Client-Auth-ID + - + -
103: 91 Tunnel-Server-Auth-ID + - + -
104: 95 NAS-IPv6-Address + - + -
105: 99 Framed-IPv6-Route - + - -
106:
107: Microsoft VSA (311)
108: 1 MS-CHAP-Response + - - -
109: 2 MS-CHAP-Error - + - -
110: 7 MS-MPPE-Encryption-Policy - + - -
111: 8 MS-MPPE-Encryption-Types - + - -
112: 10 MS-CHAP-Domain - + - -
113: 11 MS-CHAP-Challenge + - - -
114: 12 MS-CHAP-MPPE-Keys - + - -
115: 16 MS-MPPE-Send-Key - + - -
116: 17 MS-MPPE-Recv-Key - + - -
117: 25 MS-CHAP2-Response + - - -
118: 26 MS-CHAP2-Success - + - -
119: 28 MS-Primary-DNS-Server - + - -
120: 29 MS-Secondary-DNS-Server - + - -
121: 30 MS-Primary-NBNS-Server - + - -
122: 31 MS-Secondary-NBNS-Server - + - -
123:
124: DSL Forum VSA (3561)
125: 1 ADSL-Agent-Circuit-Id + - + -
126: 2 ADSL-Agent-Remote-Id + - + -
127:
128: mpd VSA (12341)
129: 1 mpd-rule - + - -
130: 2 mpd-pipe - + - -
131: 3 mpd-queue - + - -
132: 4 mpd-table - + - -
133: 5 mpd-table-static - + - -
134: 6 mpd-filter - + - -
135: 7 mpd-limit - + - -
136: 8 mpd-input-octets - - + -
137: 9 mpd-input-packets - - + -
138: 10 mpd-output-octets - - + -
139: 11 mpd-output-packets - - + -
140: 12 mpd-link + - + -
141: 13 mpd-bundle - - + -
142: 14 mpd-iface - - + -
143: 15 mpd-iface-index - - + -
144: 16 mpd-input-acct - + - -
145: 17 mpd-output-acct - + - -
146: 18 mpd-action - + - -
147: 19 mpd-peer-ident + - + -
148: 20 mpd-iface-name - + - -
149: 21 mpd-iface-descr - + - -
150: 22 mpd-iface-group - + - -
151: 154 mpd-drop-user - - - +
152: </pre>
153: </p>
154: <p>To use mpd VSA you should add such dictionary to your RADIUS server:
155: <pre>
156: #----------------------------------------------------------
157: # dictionary.mpd
158:
159: VENDOR mpd 12341
160:
161: BEGIN-VENDOR mpd
162:
163: ATTRIBUTE mpd-rule 1 string
164: ATTRIBUTE mpd-pipe 2 string
165: ATTRIBUTE mpd-queue 3 string
166: ATTRIBUTE mpd-table 4 string
167: ATTRIBUTE mpd-table-static 5 string
168: ATTRIBUTE mpd-filter 6 string
169: ATTRIBUTE mpd-limit 7 string
170: ATTRIBUTE mpd-input-octets 8 string
171: ATTRIBUTE mpd-input-packets 9 string
172: ATTRIBUTE mpd-output-octets 10 string
173: ATTRIBUTE mpd-output-packets 11 string
174: ATTRIBUTE mpd-link 12 string
175: ATTRIBUTE mpd-bundle 13 string
176: ATTRIBUTE mpd-iface 14 string
177: ATTRIBUTE mpd-iface-index 15 integer
178: ATTRIBUTE mpd-input-acct 16 string
179: ATTRIBUTE mpd-output-acct 17 string
180: ATTRIBUTE mpd-action 18 string
181: ATTRIBUTE mpd-peer-ident 19 string
182: ATTRIBUTE mpd-iface-name 20 string
183: ATTRIBUTE mpd-iface-descr 21 string
184: ATTRIBUTE mpd-iface-group 22 string
185: ATTRIBUTE mpd-drop-user 154 integer
186:
187: END-VENDOR mpd
188: #----------------------------------------------------------
189: </pre>
190: </p>
191: <p>Mpd allows RADIUS server to terminate user session by setting vendor specific
192: mpd-drop-user attribute to nonzero value in accounting start/update reply packet.</p>
193:
194: <dt><b>RADIUS ACL's</b><dd>
195: <p>Mpd can use the Access Control Lists (ACLs) given by the RADIUS server.
196: This ACLs may include ipfw rules, pipes, queues and tables and also mpd
197: internal traffic filtering/shaping/limiting features. That two sets are
198: redundant. ipfw proposed as standard and universal solution, while internal
199: filter/shaper/limiter based on ng_bpf+ng_car expected to work faster with
200: big number of active links.</p>
201:
202: <dt><b>ipfw</b><dd>
203: <p>You can write in your RADIUS configuration something like:
204: <pre>
205: mpd-table += "1=10.0.0.1",
206: mpd-table += "1=10.0.0.15",
207: mpd-pipe += "1=bw 10Kbyte/s",
208: mpd-pipe += "5=bw 20Kbyte/s",
209: mpd-rule += "1=pipe %p1 all from any to table\\(%t1\\) in",
210: mpd-rule += "2=pipe %p5 all from table\\(%t1\\) to any out",
211: mpd-rule += "100=allow all from any to any",
212: </pre>
213: </p>
214: <p>When mpd receives these parameters it will call ipfw(8) to create
215: firewall rules, pipes and queues with unique numbers starting from 10000
216: (configurable via 'set global start...'). %rX, %pX, %qX, %tX
217: macroses will be expanded within mpd-rule and mpd-queue.
218: To the end of each rule will be added "via ngX" to make the rule apply
219: only to that client's networking interface.</p>
220: <p>As a result of this example we would get these commands executed:
221: <pre>
222: ipfw table 32 add 10.0.0.1
223: ipfw table 32 add 10.0.0.15
224: ipfw pipe 10000 config bw 10Kbyte/s
225: ipfw pipe 10001 config bw 20Kbyte/s
226: ipfw add 10000 pipe 10000 all from any to table\(32\) in via ng0
227: ipfw add 10001 pipe 10001 all from table\(32\) to any out via ng0
228: ipfw add 10002 allow all from any to any via ng0
229: </pre>
230:
231: When the link goes down, all created rules will be removed.</p>
232: <p>Note: As soon as mpd executes ipfw commands using shell, shell's
233: special characters like "(" and ")" must be slashed.</p>
234:
235: <dt><b>internal (ng_bpf/ng_car)</b><dd>
236: <p>Mpd can create complex per-interface traffic filtering/limiting engines inside
237: netgraph when it is requested by mpd-filter and mpd-limit RADIUS attributes.</p>
238: <p>mpd-filter attribute is a packet filter declaration for using in mpd-limit.
239: mpd-filter consists of two main parts: match/nomatch verdict and the condition.
240: tcpdump (libpcap) expression syntax used for conditions.</p>
241: <p>mpd-filter: <em>match</em>|<em>nomatch</em> <em>{condition}</em></p>
242: <p>mpd-limit attribute is an action which should be done for packet. It consists
243: of two main parts: filter and action. </p>
244: <p>mpd-limit: <em>{filter}</em> <em>{action}</em></p>
245: <p>Filter can be or "all" (any packet) or "fltX"
246: (packets matching to specified mpd-filter).</p>
247: <p>filter: <em>any</em>|<em>fltX</em></p>
248: <p>Action can be: "" (do nothing, just account),
249: "pass" (stop processing and pass packet),
250: "deny" (stop processing and drop packet),
251: "rate-limit" (do Cisco-like rate-limit),
252: "shape" (do simple RED aware traffic shaping). </p>
253: <p>Actions "rate-limit" and "shape" can have optional "pass" suffix
254: to stop processing after doing this action.</p>
255: <p>action: <em></em> | <em>pass</em> | <em>deny</em> |
256: <em>rate-limit</em> <em>{rate(bits/s)}</em> [<em>{normal burst(bytes)}</em> [<em>{extended burst(bytes)}</em>]] [<em>pass</em>] |
257: <em>shape</em> <em>{rate(bits/s)}</em> [<em>{burst(bytes)}</em>] [<em>pass</em>]</p>
258: <p>As example you can write in your RADIUS configuration something like:
259: <pre>
260: mpd-filter += "1#1=nomatch dst net 10.0.0.0/24",
261: mpd-filter += "1#2=match dst net 10.0.0.0/8",
262: mpd-filter += "2#1=nomatch src net 10.0.0.0/24",
263: mpd-filter += "2#2=match src net 11.0.0.0/8",
264: mpd-limit += "in#1=flt1 pass",
265: mpd-limit += "in#2#Biz=all shape 64000 4000",
266: mpd-limit += "out#1=flt2 pass",
267: mpd-limit += "out#2#Biz=all rate-limit 1024000 150000 300000",
268: </pre>
269: </p>
270: <p>As result, one ng_bpf node will be created to implement traffic filters
271: and several (two for this example) ng_car nodes for traffic shaping
272: and rate-limiting. Incoming traffic to 10.0.0.0/8 except 10.0.0.0/24
273: will be passed, other traffic will be shaped to 64Kbits/s. Outgoing
274: traffic from 10.0.0.0/8 except 10.0.0.0/24 will be passed, all other
275: will be limited to 1024Kbit/s. Also traffic that passed mpd-limit rules
276: marked "Biz" will be accordingly accounted and present with that name
277: in AAA accounting requests.</p>
278:
279:
280: </dl>
281: </p>
282: <HR NOSHADE>
283: <A HREF="mpd.html"><EM>Mpd 5.6 User Manual</EM></A>
284: <b>:</b> <A HREF="mpd17.html"><EM>Configuring Mpd</EM></A>
285: <b>:</b> <A HREF="mpd29.html"><EM>Authentication, Authorization and Accounting (AAA)</EM></A>
286: <b>:</b> <EM>RADIUS</EM><BR>
287: <b>Previous:</b> <A HREF="mpd29.html"><EM>Authentication, Authorization and Accounting (AAA)</EM></A><BR>
288: <b>Next:</b> <A HREF="mpd31.html"><EM>External authentication</EM></A>
289:
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292: </BODY>
293: </HTML>
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