imapext-2007
view src/c-client/auth_pla.c @ 0:ada5e610ab86
imap-2007e
| author | yuuji@gentei.org |
|---|---|
| date | Mon, 14 Sep 2009 15:17:45 +0900 |
| parents | |
| children |
line source
1 /* ========================================================================
2 * Copyright 1988-2006 University of Washington
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 *
11 * ========================================================================
12 */
14 /*
15 * Program: Plain authenticator
16 *
17 * Author: Mark Crispin
18 * Networks and Distributed Computing
19 * Computing & Communications
20 * University of Washington
21 * Administration Building, AG-44
22 * Seattle, WA 98195
23 * Internet: MRC@CAC.Washington.EDU
24 *
25 * Date: 22 September 1998
26 * Last Edited: 30 August 2006
27 */
29 long auth_plain_client (authchallenge_t challenger,authrespond_t responder,
30 char *service,NETMBX *mb,void *stream,
31 unsigned long *trial,char *user);
32 char *auth_plain_server (authresponse_t responder,int argc,char *argv[]);
34 AUTHENTICATOR auth_pla = {
35 AU_AUTHUSER | AU_HIDE, /* allow authuser, hidden */
36 "PLAIN", /* authenticator name */
37 NIL, /* always valid */
38 auth_plain_client, /* client method */
39 auth_plain_server, /* server method */
40 NIL /* next authenticator */
41 };
43 /* Client authenticator
44 * Accepts: challenger function
45 * responder function
46 * SASL service name
47 * parsed network mailbox structure
48 * stream argument for functions
49 * pointer to current trial count
50 * returned user name
51 * Returns: T if success, NIL otherwise, number of trials incremented if retry
52 */
54 long auth_plain_client (authchallenge_t challenger,authrespond_t responder,
55 char *service,NETMBX *mb,void *stream,
56 unsigned long *trial,char *user)
57 {
58 char *u,pwd[MAILTMPLEN];
59 void *challenge;
60 unsigned long clen;
61 long ret = NIL;
62 /* snarl if not SSL/TLS session */
63 if (!mb->sslflag && !mb->tlsflag)
64 mm_log ("SECURITY PROBLEM: insecure server advertised AUTH=PLAIN",WARN);
65 /* get initial (empty) challenge */
66 if (challenge = (*challenger) (stream,&clen)) {
67 fs_give ((void **) &challenge);
68 if (clen) { /* abort if challenge non-empty */
69 mm_log ("Server bug: non-empty initial PLAIN challenge",WARN);
70 (*responder) (stream,NIL,0);
71 ret = LONGT; /* will get a BAD response back */
72 }
73 pwd[0] = NIL; /* prompt user if empty challenge */
74 mm_login (mb,user,pwd,*trial);
75 if (!pwd[0]) { /* empty challenge or user requested abort */
76 (*responder) (stream,NIL,0);
77 *trial = 0; /* cancel subsequent attempts */
78 ret = LONGT; /* will get a BAD response back */
79 }
80 else {
81 unsigned long rlen =
82 strlen (mb->authuser) + strlen (user) + strlen (pwd) + 2;
83 char *response = (char *) fs_get (rlen);
84 char *t = response; /* copy authorization id */
85 if (mb->authuser[0]) for (u = user; *u; *t++ = *u++);
86 *t++ = '\0'; /* delimiting NUL */
87 /* copy authentication id */
88 for (u = mb->authuser[0] ? mb->authuser : user; *u; *t++ = *u++);
89 *t++ = '\0'; /* delimiting NUL */
90 /* copy password */
91 for (u = pwd; *u; *t++ = *u++);
92 /* send credentials */
93 if ((*responder) (stream,response,rlen)) {
94 if (challenge = (*challenger) (stream,&clen))
95 fs_give ((void **) &challenge);
96 else {
97 ++*trial; /* can try again if necessary */
98 ret = LONGT; /* check the authentication */
99 }
100 }
101 memset (response,0,rlen); /* erase credentials */
102 fs_give ((void **) &response);
103 }
104 }
105 memset (pwd,0,MAILTMPLEN); /* erase password */
106 if (!ret) *trial = 65535; /* don't retry if bad protocol */
107 return ret;
108 }
110 /* Server authenticator
111 * Accepts: responder function
112 * argument count
113 * argument vector
114 * Returns: authenticated user name or NIL
115 */
117 char *auth_plain_server (authresponse_t responder,int argc,char *argv[])
118 {
119 char *ret = NIL;
120 char *user,*aid,*pass;
121 unsigned long len;
122 /* get user name */
123 if (aid = (*responder) ("",0,&len)) {
124 /* note: responders null-terminate */
125 if ((((unsigned long) ((user = aid + strlen (aid) + 1) - aid)) < len) &&
126 (((unsigned long) ((pass = user + strlen (user) + 1) - aid)) < len) &&
127 (((unsigned long) ((pass + strlen (pass)) - aid)) == len) &&
128 (*aid ? server_login (aid,pass,user,argc,argv) :
129 server_login (user,pass,NIL,argc,argv))) ret = myusername ();
130 fs_give ((void **) &aid);
131 }
132 return ret;
133 }