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01c52d31 | 1 | \input texinfo @c -*-texinfo-*- |
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2 | |
3 | @include gnus-overrides.texi | |
4 | ||
4e3ebde2 | 5 | @setfilename ../../info/sasl |
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6 | |
7 | @set VERSION 0.2 | |
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8 | @settitle Emacs SASL Library @value{VERSION} |
9 | ||
4e3ebde2 | 10 | @copying |
5dc584b5 | 11 | This file describes the Emacs SASL library, version @value{VERSION}. |
01c52d31 | 12 | |
acaf905b | 13 | Copyright @copyright{} 2000, 2004-2012 |
9c6b35b2 | 14 | Free Software Foundation, Inc. |
01c52d31 | 15 | |
4e3ebde2 | 16 | @quotation |
01c52d31 | 17 | Permission is granted to copy, distribute and/or modify this document |
6a2c4aec | 18 | under the terms of the GNU Free Documentation License, Version 1.3 or |
01c52d31 | 19 | any later version published by the Free Software Foundation; with no |
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20 | Invariant Sections, with the Front-Cover texts being ``A GNU Manual,'' |
21 | and with the Back-Cover Texts as in (a) below. A copy of the license | |
22 | is included in the section entitled ``GNU Free Documentation License'' | |
23 | in the Emacs manual. | |
24 | ||
25 | (a) The FSF's Back-Cover Text is: ``You have the freedom to copy and | |
26 | modify this GNU manual. Buying copies from the FSF supports it in | |
27 | developing GNU and promoting software freedom.'' | |
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28 | |
29 | This document is part of a collection distributed under the GNU Free | |
30 | Documentation License. If you want to distribute this document | |
31 | separately from the collection, you can do so by adding a copy of the | |
32 | license to the document, as described in section 6 of the license. | |
33 | @end quotation | |
34 | @end copying | |
01c52d31 | 35 | |
0c973505 | 36 | @dircategory Emacs network features |
5dc584b5 | 37 | @direntry |
62e034c2 | 38 | * SASL: (sasl). The Emacs SASL library. |
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39 | @end direntry |
40 | ||
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41 | |
42 | @titlepage | |
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43 | @ifset WEBHACKDEVEL |
44 | @title Emacs SASL Library @value{VERSION} (DEVELOPMENT VERSION) | |
45 | @end ifset | |
46 | @ifclear WEBHACKDEVEL | |
5dc584b5 | 47 | @title Emacs SASL Library @value{VERSION} |
7fbf7cae | 48 | @end ifclear |
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49 | |
50 | @author by Daiki Ueno | |
51 | @page | |
52 | ||
53 | @vskip 0pt plus 1filll | |
4e3ebde2 | 54 | @insertcopying |
01c52d31 | 55 | @end titlepage |
01c52d31 | 56 | |
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57 | |
58 | @node Top | |
59 | @top Emacs SASL | |
01c52d31 | 60 | |
5dc584b5 | 61 | SASL is a common interface to share several authentication mechanisms between |
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62 | applications using different protocols. |
63 | ||
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64 | @ifnottex |
65 | @insertcopying | |
66 | @end ifnottex | |
67 | ||
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68 | @menu |
69 | * Overview:: What Emacs SASL library is. | |
70 | * How to use:: Adding authentication support to your applications. | |
71 | * Data types:: | |
72 | * Back end drivers:: Writing your own drivers. | |
73 | * Index:: | |
74 | * Function Index:: | |
75 | * Variable Index:: | |
76 | @end menu | |
77 | ||
78 | @node Overview | |
79 | @chapter Overview | |
80 | ||
81 | @sc{sasl} is short for @dfn{Simple Authentication and Security Layer}. | |
82 | This standard is documented in RFC2222. It provides a simple method for | |
83 | adding authentication support to various application protocols. | |
84 | ||
85 | The toplevel interface of this library is inspired by Java @sc{sasl} | |
86 | Application Program Interface. It defines an abstraction over a series | |
87 | of authentication mechanism drivers (@ref{Back end drivers}). | |
88 | ||
89 | Back end drivers are designed to be close as possible to the | |
90 | authentication mechanism. You can access the additional configuration | |
91 | information anywhere from the implementation. | |
92 | ||
93 | @node How to use | |
94 | @chapter How to use | |
95 | ||
96 | (Not yet written). | |
97 | ||
98 | To use Emacs SASL library, please evaluate following expression at the | |
99 | beginning of your application program. | |
100 | ||
101 | @lisp | |
102 | (require 'sasl) | |
103 | @end lisp | |
104 | ||
105 | If you want to check existence of sasl.el at runtime, instead you | |
106 | can list autoload settings for functions you want. | |
107 | ||
108 | @node Data types | |
109 | @chapter Data types | |
110 | ||
111 | There are three data types to be used for carrying a negotiated | |
112 | security layer---a mechanism, a client parameter and an authentication | |
113 | step. | |
114 | ||
115 | @menu | |
116 | * Mechanisms:: | |
117 | * Clients:: | |
118 | * Steps:: | |
119 | @end menu | |
120 | ||
121 | @node Mechanisms | |
122 | @section Mechanisms | |
123 | ||
124 | A mechanism (@code{sasl-mechanism} object) is a schema of the @sc{sasl} | |
125 | authentication mechanism driver. | |
126 | ||
127 | @defvar sasl-mechanisms | |
128 | A list of mechanism names. | |
129 | @end defvar | |
130 | ||
131 | @defun sasl-find-mechanism mechanisms | |
132 | ||
ea597303 | 133 | Retrieve an appropriate mechanism. |
01c52d31 | 134 | This function compares @var{mechanisms} and @code{sasl-mechanisms} then |
ea597303 | 135 | returns appropriate @code{sasl-mechanism} object. |
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136 | |
137 | @example | |
138 | (let ((sasl-mechanisms '("CRAM-MD5" "DIGEST-MD5"))) | |
139 | (setq mechanism (sasl-find-mechanism server-supported-mechanisms))) | |
140 | @end example | |
141 | ||
142 | @end defun | |
143 | ||
144 | @defun sasl-mechanism-name mechanism | |
145 | Return name of mechanism, a string. | |
146 | @end defun | |
147 | ||
148 | If you want to write an authentication mechanism driver (@ref{Back end | |
149 | drivers}), use @code{sasl-make-mechanism} and modify | |
150 | @code{sasl-mechanisms} and @code{sasl-mechanism-alist} correctly. | |
151 | ||
152 | @defun sasl-make-mechanism name steps | |
153 | Allocate a @code{sasl-mechanism} object. | |
154 | This function takes two parameters---name of the mechanism, and a list | |
155 | of authentication functions. | |
156 | ||
157 | @example | |
158 | (defconst sasl-anonymous-steps | |
9360256a | 159 | '(identity ;no initial response |
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160 | sasl-anonymous-response)) |
161 | ||
162 | (put 'sasl-anonymous 'sasl-mechanism | |
163 | (sasl-make-mechanism "ANONYMOUS" sasl-anonymous-steps)) | |
164 | @end example | |
165 | ||
166 | @end defun | |
167 | ||
168 | @node Clients | |
169 | @section Clients | |
170 | ||
171 | A client (@code{sasl-client} object) initialized with four | |
172 | parameters---a mechanism, a user name, name of the service and name of | |
173 | the server. | |
174 | ||
175 | @defun sasl-make-client mechanism name service server | |
176 | Prepare a @code{sasl-client} object. | |
177 | @end defun | |
178 | ||
179 | @defun sasl-client-mechanism client | |
180 | Return the mechanism (@code{sasl-mechanism} object) of client. | |
181 | @end defun | |
182 | ||
183 | @defun sasl-client-name client | |
184 | Return the authorization name of client, a string. | |
185 | @end defun | |
186 | ||
187 | @defun sasl-client-service client | |
188 | Return the service name of client, a string. | |
189 | @end defun | |
190 | ||
191 | @defun sasl-client-server client | |
192 | Return the server name of client, a string. | |
193 | @end defun | |
194 | ||
195 | If you want to specify additional configuration properties, please use | |
196 | @code{sasl-client-set-property}. | |
197 | ||
198 | @defun sasl-client-set-property client property value | |
199 | Add the given property/value to client. | |
200 | @end defun | |
201 | ||
202 | @defun sasl-client-property client property | |
203 | Return the value of the property of client. | |
204 | @end defun | |
205 | ||
206 | @defun sasl-client-set-properties client plist | |
207 | Destructively set the properties of client. | |
208 | The second argument is the new property list. | |
209 | @end defun | |
210 | ||
211 | @defun sasl-client-properties client | |
212 | Return the whole property list of client configuration. | |
213 | @end defun | |
214 | ||
215 | @node Steps | |
216 | @section Steps | |
217 | ||
218 | A step (@code{sasl-step} object) is an abstraction of authentication | |
219 | ``step'' which holds the response value and the next entry point for the | |
220 | authentication process (the latter is not accessible). | |
221 | ||
222 | @defun sasl-step-data step | |
223 | Return the data which @var{step} holds, a string. | |
224 | @end defun | |
225 | ||
226 | @defun sasl-step-set-data step data | |
227 | Store @var{data} string to @var{step}. | |
228 | @end defun | |
229 | ||
230 | To get the initial response, you should call the function | |
231 | @code{sasl-next-step} with the second argument @code{nil}. | |
232 | ||
233 | @example | |
234 | (setq name (sasl-mechanism-name mechanism)) | |
235 | @end example | |
236 | ||
237 | At this point we could send the command which starts a SASL | |
238 | authentication protocol exchange. For example, | |
239 | ||
240 | @example | |
241 | (process-send-string | |
242 | process | |
9360256a | 243 | (if (sasl-step-data step) ;initial response |
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244 | (format "AUTH %s %s\r\n" name (base64-encode-string (sasl-step-data step) t)) |
245 | (format "AUTH %s\r\n" name))) | |
246 | @end example | |
247 | ||
248 | To go on with the authentication process, all you have to do is call | |
249 | @code{sasl-next-step} consecutively. | |
250 | ||
251 | @defun sasl-next-step client step | |
252 | Perform the authentication step. | |
253 | At the first time @var{step} should be set to @code{nil}. | |
254 | @end defun | |
255 | ||
256 | @node Back end drivers | |
257 | @chapter Back end drivers | |
258 | ||
259 | (Not yet written). | |
260 | ||
261 | @node Index | |
262 | @chapter Index | |
263 | @printindex cp | |
264 | ||
265 | @node Function Index | |
266 | @chapter Function Index | |
267 | @printindex fn | |
268 | ||
269 | @node Variable Index | |
270 | @chapter Variable Index | |
271 | @printindex vr | |
272 | ||
273 | @summarycontents | |
274 | @contents | |
275 | @bye | |
276 | ||
277 | @c End: |