Keil Studio Cloud
Mistake on this page?
Report an issue in GitHub or email us
chap-new.h
1 /*
2  * chap-new.c - New CHAP implementation.
3  *
4  * Copyright (c) 2003 Paul Mackerras. All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright
11  * notice, this list of conditions and the following disclaimer.
12  *
13  * 2. The name(s) of the authors of this software must not be used to
14  * endorse or promote products derived from this software without
15  * prior written permission.
16  *
17  * 3. Redistributions of any form whatsoever must retain the following
18  * acknowledgment:
19  * "This product includes software developed by Paul Mackerras
20  * <paulus@samba.org>".
21  *
22  * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23  * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24  * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25  * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27  * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28  * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
29  */
30 
31 #include "ppp_opts.h"
32 #if PPP_SUPPORT && CHAP_SUPPORT /* don't build if not configured for use in ppp_opts.h */
33 
34 #ifndef CHAP_H
35 #define CHAP_H
36 
37 #include "ppp.h"
38 
39 #ifdef __cplusplus
40 extern "C" {
41 #endif
42 
43 /*
44  * CHAP packets begin with a standard header with code, id, len (2 bytes).
45  */
46 #define CHAP_HDRLEN 4
47 
48 /*
49  * Values for the code field.
50  */
51 #define CHAP_CHALLENGE 1
52 #define CHAP_RESPONSE 2
53 #define CHAP_SUCCESS 3
54 #define CHAP_FAILURE 4
55 
56 /*
57  * CHAP digest codes.
58  */
59 #define CHAP_MD5 5
60 #if MSCHAP_SUPPORT
61 #define CHAP_MICROSOFT 0x80
62 #define CHAP_MICROSOFT_V2 0x81
63 #endif /* MSCHAP_SUPPORT */
64 
65 /*
66  * Semi-arbitrary limits on challenge and response fields.
67  */
68 #define MAX_CHALLENGE_LEN 64
69 #define MAX_RESPONSE_LEN 64
70 
71 /*
72  * These limits apply to challenge and response packets we send.
73  * The +4 is the +1 that we actually need rounded up.
74  */
75 #define CHAL_MAX_PKTLEN (PPP_HDRLEN + CHAP_HDRLEN + 4 + MAX_CHALLENGE_LEN + MAXNAMELEN)
76 #define RESP_MAX_PKTLEN (PPP_HDRLEN + CHAP_HDRLEN + 4 + MAX_RESPONSE_LEN + MAXNAMELEN)
77 
78 /* bitmask of supported algorithms */
79 #if MSCHAP_SUPPORT
80 #define MDTYPE_MICROSOFT_V2 0x1
81 #define MDTYPE_MICROSOFT 0x2
82 #endif /* MSCHAP_SUPPORT */
83 #define MDTYPE_MD5 0x4
84 #define MDTYPE_NONE 0
85 
86 #if MSCHAP_SUPPORT
87 /* Return the digest alg. ID for the most preferred digest type. */
88 #define CHAP_DIGEST(mdtype) \
89  ((mdtype) & MDTYPE_MD5)? CHAP_MD5: \
90  ((mdtype) & MDTYPE_MICROSOFT_V2)? CHAP_MICROSOFT_V2: \
91  ((mdtype) & MDTYPE_MICROSOFT)? CHAP_MICROSOFT: \
92  0
93 #else /* !MSCHAP_SUPPORT */
94 #define CHAP_DIGEST(mdtype) \
95  ((mdtype) & MDTYPE_MD5)? CHAP_MD5: \
96  0
97 #endif /* MSCHAP_SUPPORT */
98 
99 /* Return the bit flag (lsb set) for our most preferred digest type. */
100 #define CHAP_MDTYPE(mdtype) ((mdtype) ^ ((mdtype) - 1)) & (mdtype)
101 
102 /* Return the bit flag for a given digest algorithm ID. */
103 #if MSCHAP_SUPPORT
104 #define CHAP_MDTYPE_D(digest) \
105  ((digest) == CHAP_MICROSOFT_V2)? MDTYPE_MICROSOFT_V2: \
106  ((digest) == CHAP_MICROSOFT)? MDTYPE_MICROSOFT: \
107  ((digest) == CHAP_MD5)? MDTYPE_MD5: \
108  0
109 #else /* !MSCHAP_SUPPORT */
110 #define CHAP_MDTYPE_D(digest) \
111  ((digest) == CHAP_MD5)? MDTYPE_MD5: \
112  0
113 #endif /* MSCHAP_SUPPORT */
114 
115 /* Can we do the requested digest? */
116 #if MSCHAP_SUPPORT
117 #define CHAP_CANDIGEST(mdtype, digest) \
118  ((digest) == CHAP_MICROSOFT_V2)? (mdtype) & MDTYPE_MICROSOFT_V2: \
119  ((digest) == CHAP_MICROSOFT)? (mdtype) & MDTYPE_MICROSOFT: \
120  ((digest) == CHAP_MD5)? (mdtype) & MDTYPE_MD5: \
121  0
122 #else /* !MSCHAP_SUPPORT */
123 #define CHAP_CANDIGEST(mdtype, digest) \
124  ((digest) == CHAP_MD5)? (mdtype) & MDTYPE_MD5: \
125  0
126 #endif /* MSCHAP_SUPPORT */
127 
128 /*
129  * The code for each digest type has to supply one of these.
130  */
131 struct chap_digest_type {
132  int code;
133 
134 #if PPP_SERVER
135  /*
136  * Note: challenge and response arguments below are formatted as
137  * a length byte followed by the actual challenge/response data.
138  */
139  void (*generate_challenge)(ppp_pcb *pcb, unsigned char *challenge);
140  int (*verify_response)(ppp_pcb *pcb, int id, const char *name,
141  const unsigned char *secret, int secret_len,
142  const unsigned char *challenge, const unsigned char *response,
143  char *message, int message_space);
144 #endif /* PPP_SERVER */
145  void (*make_response)(ppp_pcb *pcb, unsigned char *response, int id, const char *our_name,
146  const unsigned char *challenge, const char *secret, int secret_len,
147  unsigned char *priv);
148  int (*check_success)(ppp_pcb *pcb, unsigned char *pkt, int len, unsigned char *priv);
149  void (*handle_failure)(ppp_pcb *pcb, unsigned char *pkt, int len);
150 };
151 
152 /*
153  * Each interface is described by chap structure.
154  */
155 #if CHAP_SUPPORT
156 typedef struct chap_client_state {
157  u8_t flags;
158  const char *name;
159  const struct chap_digest_type *digest;
160  unsigned char priv[64]; /* private area for digest's use */
161 } chap_client_state;
162 
163 #if PPP_SERVER
164 typedef struct chap_server_state {
165  u8_t flags;
166  u8_t id;
167  const char *name;
168  const struct chap_digest_type *digest;
169  int challenge_xmits;
170  int challenge_pktlen;
171  unsigned char challenge[CHAL_MAX_PKTLEN];
172 } chap_server_state;
173 #endif /* PPP_SERVER */
174 #endif /* CHAP_SUPPORT */
175 
176 #if 0 /* UNUSED */
177 /* Hook for a plugin to validate CHAP challenge */
178 extern int (*chap_verify_hook)(char *name, char *ourname, int id,
179  const struct chap_digest_type *digest,
180  unsigned char *challenge, unsigned char *response,
181  char *message, int message_space);
182 #endif /* UNUSED */
183 
184 #if PPP_SERVER
185 /* Called by authentication code to start authenticating the peer. */
186 extern void chap_auth_peer(ppp_pcb *pcb, const char *our_name, int digest_code);
187 #endif /* PPP_SERVER */
188 
189 /* Called by auth. code to start authenticating us to the peer. */
190 extern void chap_auth_with_peer(ppp_pcb *pcb, const char *our_name, int digest_code);
191 
192 /* Represents the CHAP protocol to the main pppd code */
193 extern const struct protent chap_protent;
194 
195 #ifdef __cplusplus
196 }
197 #endif
198 
199 #endif /* CHAP_H */
200 #endif /* PPP_SUPPORT && CHAP_SUPPORT */
Important Information for this Arm website

This site uses cookies to store information on your computer. By continuing to use our site, you consent to our cookies. If you are not happy with the use of these cookies, please review our Cookie Policy to learn how they can be disabled. By disabling cookies, some features of the site will not work.