Annotation of src/usr.bin/ssh/radix.c, Revision 1.7
1.1 deraadt 1: /*
1.5 deraadt 2: * radix.c
3: *
4: * base-64 encoding pinched from lynx2-7-2, who pinched it from rpem.
5: * Originally written by Mark Riordan 12 August 1990 and 17 Feb 1991
6: * and placed in the public domain.
7: *
8: * Dug Song <dugsong@UMICH.EDU>
9: */
1.4 markus 10:
1.1 deraadt 11: #include "includes.h"
12:
13: #ifdef AFS
14: #include <krb.h>
15:
16: char six2pr[64] = {
1.4 markus 17: 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
18: 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
19: 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
20: 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
21: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
1.1 deraadt 22: };
23:
24: unsigned char pr2six[256];
25:
1.4 markus 26: int
27: uuencode(unsigned char *bufin, unsigned int nbytes, char *bufcoded)
1.1 deraadt 28: {
1.4 markus 29: /* ENC is the basic 1 character encoding function to make a char printing */
1.1 deraadt 30: #define ENC(c) six2pr[c]
1.4 markus 31:
32: register char *outptr = bufcoded;
33: unsigned int i;
34:
35: for (i = 0; i < nbytes; i += 3) {
36: *(outptr++) = ENC(*bufin >> 2); /* c1 */
37: *(outptr++) = ENC(((*bufin << 4) & 060) | ((bufin[1] >> 4) & 017)); /* c2 */
38: *(outptr++) = ENC(((bufin[1] << 2) & 074) | ((bufin[2] >> 6) & 03)); /* c3 */
39: *(outptr++) = ENC(bufin[2] & 077); /* c4 */
40: bufin += 3;
41: }
42: if (i == nbytes + 1) {
43: outptr[-1] = '=';
44: } else if (i == nbytes + 2) {
45: outptr[-1] = '=';
46: outptr[-2] = '=';
47: }
48: *outptr = '\0';
49: return (outptr - bufcoded);
1.1 deraadt 50: }
51:
1.4 markus 52: int
53: uudecode(const char *bufcoded, unsigned char *bufplain, int outbufsize)
1.1 deraadt 54: {
1.4 markus 55: /* single character decode */
1.2 dugsong 56: #define DEC(c) pr2six[(unsigned char)c]
1.1 deraadt 57: #define MAXVAL 63
1.4 markus 58:
59: static int first = 1;
60: int nbytesdecoded, j;
61: const char *bufin = bufcoded;
62: register unsigned char *bufout = bufplain;
63: register int nprbytes;
64:
65: /* If this is the first call, initialize the mapping table. */
66: if (first) {
67: first = 0;
68: for (j = 0; j < 256; j++)
69: pr2six[j] = MAXVAL + 1;
70: for (j = 0; j < 64; j++)
71: pr2six[(unsigned char) six2pr[j]] = (unsigned char) j;
72: }
73: /* Strip leading whitespace. */
74: while (*bufcoded == ' ' || *bufcoded == '\t')
75: bufcoded++;
76:
1.6 markus 77: /*
78: * Figure out how many characters are in the input buffer. If this
79: * would decode into more bytes than would fit into the output
80: * buffer, adjust the number of input bytes downwards.
81: */
1.4 markus 82: bufin = bufcoded;
83: while (DEC(*(bufin++)) <= MAXVAL);
84: nprbytes = bufin - bufcoded - 1;
85: nbytesdecoded = ((nprbytes + 3) / 4) * 3;
86: if (nbytesdecoded > outbufsize)
87: nprbytes = (outbufsize * 4) / 3;
88:
89: bufin = bufcoded;
90:
91: while (nprbytes > 0) {
92: *(bufout++) = (unsigned char) (DEC(*bufin) << 2 | DEC(bufin[1]) >> 4);
93: *(bufout++) = (unsigned char) (DEC(bufin[1]) << 4 | DEC(bufin[2]) >> 2);
94: *(bufout++) = (unsigned char) (DEC(bufin[2]) << 6 | DEC(bufin[3]));
95: bufin += 4;
96: nprbytes -= 4;
97: }
98: if (nprbytes & 03) {
99: if (DEC(bufin[-2]) > MAXVAL)
100: nbytesdecoded -= 2;
101: else
102: nbytesdecoded -= 1;
103: }
104: return (nbytesdecoded);
1.1 deraadt 105: }
106:
107: typedef unsigned char my_u_char;
108: typedef unsigned int my_u_int32_t;
109: typedef unsigned short my_u_short;
110:
111: /* Nasty macros from BIND-4.9.2 */
112:
113: #define GETSHORT(s, cp) { \
114: register my_u_char *t_cp = (my_u_char*)(cp); \
115: (s) = (((my_u_short)t_cp[0]) << 8) \
116: | (((my_u_short)t_cp[1])) \
117: ; \
118: (cp) += 2; \
119: }
120:
121: #define GETLONG(l, cp) { \
122: register my_u_char *t_cp = (my_u_char*)(cp); \
123: (l) = (((my_u_int32_t)t_cp[0]) << 24) \
124: | (((my_u_int32_t)t_cp[1]) << 16) \
125: | (((my_u_int32_t)t_cp[2]) << 8) \
126: | (((my_u_int32_t)t_cp[3])) \
127: ; \
128: (cp) += 4; \
129: }
130:
131: #define PUTSHORT(s, cp) { \
132: register my_u_short t_s = (my_u_short)(s); \
133: register my_u_char *t_cp = (my_u_char*)(cp); \
134: *t_cp++ = t_s >> 8; \
135: *t_cp = t_s; \
136: (cp) += 2; \
137: }
138:
139: #define PUTLONG(l, cp) { \
140: register my_u_int32_t t_l = (my_u_int32_t)(l); \
141: register my_u_char *t_cp = (my_u_char*)(cp); \
142: *t_cp++ = t_l >> 24; \
143: *t_cp++ = t_l >> 16; \
144: *t_cp++ = t_l >> 8; \
145: *t_cp = t_l; \
146: (cp) += 4; \
147: }
148:
149: #define GETSTRING(s, p, p_l) { \
150: register char* p_targ = (p) + p_l; \
151: register char* s_c = (s); \
152: register char* p_c = (p); \
153: while (*p_c && (p_c < p_targ)) { \
154: *s_c++ = *p_c++; \
155: } \
156: if (p_c == p_targ) { \
157: return 1; \
158: } \
159: *s_c = *p_c++; \
160: (p_l) = (p_l) - (p_c - (p)); \
161: (p) = p_c; \
162: }
163:
164:
1.4 markus 165: int
166: creds_to_radix(CREDENTIALS *creds, unsigned char *buf)
1.1 deraadt 167: {
1.4 markus 168: char *p, *s;
169: int len;
170: char temp[2048];
171:
172: p = temp;
173: *p++ = 1; /* version */
174: s = creds->service;
175: while (*s)
176: *p++ = *s++;
177: *p++ = *s;
178: s = creds->instance;
179: while (*s)
180: *p++ = *s++;
181: *p++ = *s;
182: s = creds->realm;
183: while (*s)
184: *p++ = *s++;
185: *p++ = *s;
186:
187: s = creds->pname;
188: while (*s)
189: *p++ = *s++;
190: *p++ = *s;
191: s = creds->pinst;
192: while (*s)
193: *p++ = *s++;
194: *p++ = *s;
195: /* Null string to repeat the realm. */
196: *p++ = '\0';
197:
198: PUTLONG(creds->issue_date, p);
199: {
200: unsigned int endTime;
201: endTime = (unsigned int) krb_life_to_time(creds->issue_date,
202: creds->lifetime);
203: PUTLONG(endTime, p);
204: }
205:
206: memcpy(p, &creds->session, sizeof(creds->session));
207: p += sizeof(creds->session);
208:
209: PUTSHORT(creds->kvno, p);
210: PUTLONG(creds->ticket_st.length, p);
211:
212: memcpy(p, creds->ticket_st.dat, creds->ticket_st.length);
213: p += creds->ticket_st.length;
214: len = p - temp;
1.1 deraadt 215:
1.7 ! markus 216: return (uuencode((unsigned char *)temp, len, (char *)buf));
1.1 deraadt 217: }
218:
1.4 markus 219: int
220: radix_to_creds(const char *buf, CREDENTIALS *creds)
1.1 deraadt 221: {
222:
1.4 markus 223: char *p;
224: int len, tl;
225: char version;
226: char temp[2048];
227:
1.7 ! markus 228: if (!(len = uudecode(buf, (unsigned char *)temp, sizeof(temp))))
1.4 markus 229: return 0;
230:
231: p = temp;
232:
233: /* check version and length! */
234: if (len < 1)
235: return 0;
236: version = *p;
237: p++;
238: len--;
239:
240: GETSTRING(creds->service, p, len);
241: GETSTRING(creds->instance, p, len);
242: GETSTRING(creds->realm, p, len);
243:
244: GETSTRING(creds->pname, p, len);
245: GETSTRING(creds->pinst, p, len);
246: /* Ignore possibly different realm. */
247: while (*p && len)
248: p++, len--;
249: if (len == 0)
250: return 0;
251: p++, len--;
252:
253: /* Enough space for remaining fixed-length parts? */
254: if (len < (4 + 4 + sizeof(creds->session) + 2 + 4))
255: return 0;
256:
257: GETLONG(creds->issue_date, p);
258: len -= 4;
259: {
260: unsigned int endTime;
261: GETLONG(endTime, p);
262: len -= 4;
263: creds->lifetime = krb_time_to_life(creds->issue_date, endTime);
264: }
265:
266: memcpy(&creds->session, p, sizeof(creds->session));
267: p += sizeof(creds->session);
268: len -= sizeof(creds->session);
269:
270: GETSHORT(creds->kvno, p);
271: len -= 2;
272: GETLONG(creds->ticket_st.length, p);
273: len -= 4;
274:
275: tl = creds->ticket_st.length;
276: if (tl < 0 || tl > len || tl > sizeof(creds->ticket_st.dat))
277: return 0;
278:
279: memcpy(creds->ticket_st.dat, p, tl);
280: p += tl;
281: len -= tl;
282:
283: return 1;
1.1 deraadt 284: }
285: #endif /* AFS */
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