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1 /*
2  * Copyright (c) 1999 Dug Song.  All rights reserved.
3  * Copyright (c) 2002 Markus Friedl.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24  */
25
26 #include "includes.h"
27 #include "uuencode.h"
28
29 RCSID("$OpenBSD: radix.c,v 1.21 2002/06/19 00:27:55 deraadt Exp $");
30
31 #ifdef AFS
32 #include <krb.h>
33
34 #include <radix.h>
35 #include "bufaux.h"
36
37 int
38 creds_to_radix(CREDENTIALS *creds, u_char *buf, size_t buflen)
39 {
40         Buffer b;
41         int ret;
42
43         buffer_init(&b);
44
45         buffer_put_char(&b, 1); /* version */
46
47         buffer_append(&b, creds->service, strlen(creds->service));
48         buffer_put_char(&b, '\0');
49         buffer_append(&b, creds->instance, strlen(creds->instance));
50         buffer_put_char(&b, '\0');
51         buffer_append(&b, creds->realm, strlen(creds->realm));
52         buffer_put_char(&b, '\0');
53         buffer_append(&b, creds->pname, strlen(creds->pname));
54         buffer_put_char(&b, '\0');
55         buffer_append(&b, creds->pinst, strlen(creds->pinst));
56         buffer_put_char(&b, '\0');
57
58         /* Null string to repeat the realm. */
59         buffer_put_char(&b, '\0');
60
61         buffer_put_int(&b, creds->issue_date);
62         buffer_put_int(&b, krb_life_to_time(creds->issue_date,
63             creds->lifetime));
64         buffer_append(&b, creds->session, sizeof(creds->session));
65         buffer_put_short(&b, creds->kvno);
66
67         /* 32 bit size + data */
68         buffer_put_string(&b, creds->ticket_st.dat, creds->ticket_st.length);
69
70         ret = uuencode(buffer_ptr(&b), buffer_len(&b), (char *)buf, buflen);
71
72         buffer_free(&b);
73         return ret;
74 }
75
76 #define GETSTRING(b, t, tlen) \
77         do { \
78                 int i, found = 0; \
79                 for (i = 0; i < tlen; i++) { \
80                         if (buffer_len(b) == 0) \
81                                 goto done; \
82                         t[i] = buffer_get_char(b); \
83                         if (t[i] == '\0') { \
84                                 found = 1; \
85                                 break; \
86                         } \
87                 } \
88                 if (!found) \
89                         goto done; \
90         } while(0)
91
92 int
93 radix_to_creds(const char *buf, CREDENTIALS *creds)
94 {
95         Buffer b;
96         char c, version, *space, *p;
97         u_int endTime;
98         int len, blen, ret;
99
100         ret = 0;
101         blen = strlen(buf);
102
103         /* sanity check for size */
104         if (blen > 8192)
105                 return 0;
106
107         buffer_init(&b);
108         space = buffer_append_space(&b, blen);
109
110         /* check version and length! */
111         len = uudecode(buf, space, blen);
112         if (len < 1)
113                 goto done;
114
115         version = buffer_get_char(&b);
116
117         GETSTRING(&b, creds->service, sizeof creds->service);
118         GETSTRING(&b, creds->instance, sizeof creds->instance);
119         GETSTRING(&b, creds->realm, sizeof creds->realm);
120         GETSTRING(&b, creds->pname, sizeof creds->pname);
121         GETSTRING(&b, creds->pinst, sizeof creds->pinst);
122
123         if (buffer_len(&b) == 0)
124                 goto done;
125
126         /* Ignore possibly different realm. */
127         while (buffer_len(&b) > 0 && (c = buffer_get_char(&b)) != '\0')
128                 ;
129
130         if (buffer_len(&b) == 0)
131                 goto done;
132
133         creds->issue_date = buffer_get_int(&b);
134
135         endTime = buffer_get_int(&b);
136         creds->lifetime = krb_time_to_life(creds->issue_date, endTime);
137
138         len = buffer_len(&b);
139         if (len < sizeof(creds->session))
140                 goto done;
141         memcpy(&creds->session, buffer_ptr(&b), sizeof(creds->session));
142         buffer_consume(&b, sizeof(creds->session));
143
144         creds->kvno = buffer_get_short(&b);
145
146         p = buffer_get_string(&b, &len);
147         if (len < 0 || len > sizeof(creds->ticket_st.dat))
148                 goto done;
149         memcpy(&creds->ticket_st.dat, p, len);
150         creds->ticket_st.length = len;
151
152         ret = 1;
153 done:
154         buffer_free(&b);
155         return ret;
156 }
157 #endif /* AFS */
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