Annotation of src/usr.bin/ssh/radix.c, Revision 1.5
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:
77: /* Figure out how many characters are in the input buffer. If this
78: would decode into more bytes than would fit into the output
79: buffer, adjust the number of input bytes downwards. */
80: bufin = bufcoded;
81: while (DEC(*(bufin++)) <= MAXVAL);
82: nprbytes = bufin - bufcoded - 1;
83: nbytesdecoded = ((nprbytes + 3) / 4) * 3;
84: if (nbytesdecoded > outbufsize)
85: nprbytes = (outbufsize * 4) / 3;
86:
87: bufin = bufcoded;
88:
89: while (nprbytes > 0) {
90: *(bufout++) = (unsigned char) (DEC(*bufin) << 2 | DEC(bufin[1]) >> 4);
91: *(bufout++) = (unsigned char) (DEC(bufin[1]) << 4 | DEC(bufin[2]) >> 2);
92: *(bufout++) = (unsigned char) (DEC(bufin[2]) << 6 | DEC(bufin[3]));
93: bufin += 4;
94: nprbytes -= 4;
95: }
96: if (nprbytes & 03) {
97: if (DEC(bufin[-2]) > MAXVAL)
98: nbytesdecoded -= 2;
99: else
100: nbytesdecoded -= 1;
101: }
102: return (nbytesdecoded);
1.1 deraadt 103: }
104:
105: typedef unsigned char my_u_char;
106: typedef unsigned int my_u_int32_t;
107: typedef unsigned short my_u_short;
108:
109: /* Nasty macros from BIND-4.9.2 */
110:
111: #define GETSHORT(s, cp) { \
112: register my_u_char *t_cp = (my_u_char*)(cp); \
113: (s) = (((my_u_short)t_cp[0]) << 8) \
114: | (((my_u_short)t_cp[1])) \
115: ; \
116: (cp) += 2; \
117: }
118:
119: #define GETLONG(l, cp) { \
120: register my_u_char *t_cp = (my_u_char*)(cp); \
121: (l) = (((my_u_int32_t)t_cp[0]) << 24) \
122: | (((my_u_int32_t)t_cp[1]) << 16) \
123: | (((my_u_int32_t)t_cp[2]) << 8) \
124: | (((my_u_int32_t)t_cp[3])) \
125: ; \
126: (cp) += 4; \
127: }
128:
129: #define PUTSHORT(s, cp) { \
130: register my_u_short t_s = (my_u_short)(s); \
131: register my_u_char *t_cp = (my_u_char*)(cp); \
132: *t_cp++ = t_s >> 8; \
133: *t_cp = t_s; \
134: (cp) += 2; \
135: }
136:
137: #define PUTLONG(l, cp) { \
138: register my_u_int32_t t_l = (my_u_int32_t)(l); \
139: register my_u_char *t_cp = (my_u_char*)(cp); \
140: *t_cp++ = t_l >> 24; \
141: *t_cp++ = t_l >> 16; \
142: *t_cp++ = t_l >> 8; \
143: *t_cp = t_l; \
144: (cp) += 4; \
145: }
146:
147: #define GETSTRING(s, p, p_l) { \
148: register char* p_targ = (p) + p_l; \
149: register char* s_c = (s); \
150: register char* p_c = (p); \
151: while (*p_c && (p_c < p_targ)) { \
152: *s_c++ = *p_c++; \
153: } \
154: if (p_c == p_targ) { \
155: return 1; \
156: } \
157: *s_c = *p_c++; \
158: (p_l) = (p_l) - (p_c - (p)); \
159: (p) = p_c; \
160: }
161:
162:
1.4 markus 163: int
164: creds_to_radix(CREDENTIALS *creds, unsigned char *buf)
1.1 deraadt 165: {
1.4 markus 166: char *p, *s;
167: int len;
168: char temp[2048];
169:
170: p = temp;
171: *p++ = 1; /* version */
172: s = creds->service;
173: while (*s)
174: *p++ = *s++;
175: *p++ = *s;
176: s = creds->instance;
177: while (*s)
178: *p++ = *s++;
179: *p++ = *s;
180: s = creds->realm;
181: while (*s)
182: *p++ = *s++;
183: *p++ = *s;
184:
185: s = creds->pname;
186: while (*s)
187: *p++ = *s++;
188: *p++ = *s;
189: s = creds->pinst;
190: while (*s)
191: *p++ = *s++;
192: *p++ = *s;
193: /* Null string to repeat the realm. */
194: *p++ = '\0';
195:
196: PUTLONG(creds->issue_date, p);
197: {
198: unsigned int endTime;
199: endTime = (unsigned int) krb_life_to_time(creds->issue_date,
200: creds->lifetime);
201: PUTLONG(endTime, p);
202: }
203:
204: memcpy(p, &creds->session, sizeof(creds->session));
205: p += sizeof(creds->session);
206:
207: PUTSHORT(creds->kvno, p);
208: PUTLONG(creds->ticket_st.length, p);
209:
210: memcpy(p, creds->ticket_st.dat, creds->ticket_st.length);
211: p += creds->ticket_st.length;
212: len = p - temp;
1.1 deraadt 213:
1.4 markus 214: return (uuencode(temp, len, buf));
1.1 deraadt 215: }
216:
1.4 markus 217: int
218: radix_to_creds(const char *buf, CREDENTIALS *creds)
1.1 deraadt 219: {
220:
1.4 markus 221: char *p;
222: int len, tl;
223: char version;
224: char temp[2048];
225:
226: if (!(len = uudecode(buf, temp, sizeof(temp))))
227: return 0;
228:
229: p = temp;
230:
231: /* check version and length! */
232: if (len < 1)
233: return 0;
234: version = *p;
235: p++;
236: len--;
237:
238: GETSTRING(creds->service, p, len);
239: GETSTRING(creds->instance, p, len);
240: GETSTRING(creds->realm, p, len);
241:
242: GETSTRING(creds->pname, p, len);
243: GETSTRING(creds->pinst, p, len);
244: /* Ignore possibly different realm. */
245: while (*p && len)
246: p++, len--;
247: if (len == 0)
248: return 0;
249: p++, len--;
250:
251: /* Enough space for remaining fixed-length parts? */
252: if (len < (4 + 4 + sizeof(creds->session) + 2 + 4))
253: return 0;
254:
255: GETLONG(creds->issue_date, p);
256: len -= 4;
257: {
258: unsigned int endTime;
259: GETLONG(endTime, p);
260: len -= 4;
261: creds->lifetime = krb_time_to_life(creds->issue_date, endTime);
262: }
263:
264: memcpy(&creds->session, p, sizeof(creds->session));
265: p += sizeof(creds->session);
266: len -= sizeof(creds->session);
267:
268: GETSHORT(creds->kvno, p);
269: len -= 2;
270: GETLONG(creds->ticket_st.length, p);
271: len -= 4;
272:
273: tl = creds->ticket_st.length;
274: if (tl < 0 || tl > len || tl > sizeof(creds->ticket_st.dat))
275: return 0;
276:
277: memcpy(creds->ticket_st.dat, p, tl);
278: p += tl;
279: len -= tl;
280:
281: return 1;
1.1 deraadt 282: }
283: #endif /* AFS */
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