286 lines
6.3 KiB
C
286 lines
6.3 KiB
C
/*
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* radix.c
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*
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* base-64 encoding pinched from lynx2-7-2, who pinched it from rpem.
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* Originally written by Mark Riordan 12 August 1990 and 17 Feb 1991
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* and placed in the public domain.
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*
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* Dug Song <dugsong@UMICH.EDU>
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*/
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#include "includes.h"
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#ifdef AFS
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#include <krb.h>
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char six2pr[64] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
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'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
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'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm',
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'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
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'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
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};
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unsigned char pr2six[256];
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int
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uuencode(unsigned char *bufin, unsigned int nbytes, char *bufcoded)
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{
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/* ENC is the basic 1 character encoding function to make a char printing */
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#define ENC(c) six2pr[c]
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register char *outptr = bufcoded;
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unsigned int i;
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for (i = 0; i < nbytes; i += 3) {
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*(outptr++) = ENC(*bufin >> 2); /* c1 */
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*(outptr++) = ENC(((*bufin << 4) & 060) | ((bufin[1] >> 4) & 017)); /* c2 */
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*(outptr++) = ENC(((bufin[1] << 2) & 074) | ((bufin[2] >> 6) & 03)); /* c3 */
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*(outptr++) = ENC(bufin[2] & 077); /* c4 */
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bufin += 3;
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}
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if (i == nbytes + 1) {
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outptr[-1] = '=';
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} else if (i == nbytes + 2) {
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outptr[-1] = '=';
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outptr[-2] = '=';
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}
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*outptr = '\0';
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return (outptr - bufcoded);
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}
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int
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uudecode(const char *bufcoded, unsigned char *bufplain, int outbufsize)
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{
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/* single character decode */
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#define DEC(c) pr2six[(unsigned char)c]
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#define MAXVAL 63
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static int first = 1;
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int nbytesdecoded, j;
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const char *bufin = bufcoded;
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register unsigned char *bufout = bufplain;
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register int nprbytes;
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/* If this is the first call, initialize the mapping table. */
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if (first) {
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first = 0;
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for (j = 0; j < 256; j++)
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pr2six[j] = MAXVAL + 1;
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for (j = 0; j < 64; j++)
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pr2six[(unsigned char) six2pr[j]] = (unsigned char) j;
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}
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/* Strip leading whitespace. */
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while (*bufcoded == ' ' || *bufcoded == '\t')
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bufcoded++;
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/*
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* Figure out how many characters are in the input buffer. If this
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* would decode into more bytes than would fit into the output
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* buffer, adjust the number of input bytes downwards.
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*/
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bufin = bufcoded;
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while (DEC(*(bufin++)) <= MAXVAL);
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nprbytes = bufin - bufcoded - 1;
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nbytesdecoded = ((nprbytes + 3) / 4) * 3;
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if (nbytesdecoded > outbufsize)
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nprbytes = (outbufsize * 4) / 3;
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bufin = bufcoded;
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while (nprbytes > 0) {
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*(bufout++) = (unsigned char) (DEC(*bufin) << 2 | DEC(bufin[1]) >> 4);
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*(bufout++) = (unsigned char) (DEC(bufin[1]) << 4 | DEC(bufin[2]) >> 2);
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*(bufout++) = (unsigned char) (DEC(bufin[2]) << 6 | DEC(bufin[3]));
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bufin += 4;
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nprbytes -= 4;
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}
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if (nprbytes & 03) {
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if (DEC(bufin[-2]) > MAXVAL)
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nbytesdecoded -= 2;
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else
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nbytesdecoded -= 1;
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}
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return (nbytesdecoded);
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}
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typedef unsigned char my_u_char;
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typedef unsigned int my_u_int32_t;
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typedef unsigned short my_u_short;
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/* Nasty macros from BIND-4.9.2 */
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#define GETSHORT(s, cp) { \
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register my_u_char *t_cp = (my_u_char*)(cp); \
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(s) = (((my_u_short)t_cp[0]) << 8) \
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| (((my_u_short)t_cp[1])) \
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; \
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(cp) += 2; \
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}
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#define GETLONG(l, cp) { \
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register my_u_char *t_cp = (my_u_char*)(cp); \
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(l) = (((my_u_int32_t)t_cp[0]) << 24) \
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| (((my_u_int32_t)t_cp[1]) << 16) \
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| (((my_u_int32_t)t_cp[2]) << 8) \
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| (((my_u_int32_t)t_cp[3])) \
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; \
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(cp) += 4; \
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}
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#define PUTSHORT(s, cp) { \
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register my_u_short t_s = (my_u_short)(s); \
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register my_u_char *t_cp = (my_u_char*)(cp); \
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*t_cp++ = t_s >> 8; \
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*t_cp = t_s; \
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(cp) += 2; \
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}
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#define PUTLONG(l, cp) { \
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register my_u_int32_t t_l = (my_u_int32_t)(l); \
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register my_u_char *t_cp = (my_u_char*)(cp); \
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*t_cp++ = t_l >> 24; \
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*t_cp++ = t_l >> 16; \
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*t_cp++ = t_l >> 8; \
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*t_cp = t_l; \
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(cp) += 4; \
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}
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#define GETSTRING(s, p, p_l) { \
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register char* p_targ = (p) + p_l; \
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register char* s_c = (s); \
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register char* p_c = (p); \
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while (*p_c && (p_c < p_targ)) { \
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*s_c++ = *p_c++; \
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} \
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if (p_c == p_targ) { \
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return 1; \
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} \
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*s_c = *p_c++; \
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(p_l) = (p_l) - (p_c - (p)); \
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(p) = p_c; \
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}
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int
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creds_to_radix(CREDENTIALS *creds, unsigned char *buf)
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{
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char *p, *s;
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int len;
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char temp[2048];
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p = temp;
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*p++ = 1; /* version */
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s = creds->service;
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while (*s)
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*p++ = *s++;
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*p++ = *s;
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s = creds->instance;
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while (*s)
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*p++ = *s++;
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*p++ = *s;
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s = creds->realm;
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while (*s)
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*p++ = *s++;
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*p++ = *s;
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s = creds->pname;
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while (*s)
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*p++ = *s++;
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*p++ = *s;
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s = creds->pinst;
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while (*s)
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*p++ = *s++;
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*p++ = *s;
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/* Null string to repeat the realm. */
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*p++ = '\0';
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PUTLONG(creds->issue_date, p);
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{
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unsigned int endTime;
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endTime = (unsigned int) krb_life_to_time(creds->issue_date,
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creds->lifetime);
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PUTLONG(endTime, p);
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}
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memcpy(p, &creds->session, sizeof(creds->session));
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p += sizeof(creds->session);
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PUTSHORT(creds->kvno, p);
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PUTLONG(creds->ticket_st.length, p);
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memcpy(p, creds->ticket_st.dat, creds->ticket_st.length);
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p += creds->ticket_st.length;
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len = p - temp;
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return (uuencode((unsigned char *)temp, len, (char *)buf));
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}
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int
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radix_to_creds(const char *buf, CREDENTIALS *creds)
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{
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char *p;
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int len, tl;
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char version;
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char temp[2048];
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if (!(len = uudecode(buf, (unsigned char *)temp, sizeof(temp))))
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return 0;
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p = temp;
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/* check version and length! */
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if (len < 1)
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return 0;
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version = *p;
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p++;
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len--;
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GETSTRING(creds->service, p, len);
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GETSTRING(creds->instance, p, len);
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GETSTRING(creds->realm, p, len);
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GETSTRING(creds->pname, p, len);
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GETSTRING(creds->pinst, p, len);
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/* Ignore possibly different realm. */
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while (*p && len)
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p++, len--;
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if (len == 0)
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return 0;
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p++, len--;
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/* Enough space for remaining fixed-length parts? */
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if (len < (4 + 4 + sizeof(creds->session) + 2 + 4))
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return 0;
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GETLONG(creds->issue_date, p);
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len -= 4;
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{
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unsigned int endTime;
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GETLONG(endTime, p);
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len -= 4;
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creds->lifetime = krb_time_to_life(creds->issue_date, endTime);
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}
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memcpy(&creds->session, p, sizeof(creds->session));
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p += sizeof(creds->session);
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len -= sizeof(creds->session);
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GETSHORT(creds->kvno, p);
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len -= 2;
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GETLONG(creds->ticket_st.length, p);
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len -= 4;
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tl = creds->ticket_st.length;
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if (tl < 0 || tl > len || tl > sizeof(creds->ticket_st.dat))
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return 0;
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memcpy(creds->ticket_st.dat, p, tl);
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p += tl;
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len -= tl;
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return 1;
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}
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#endif /* AFS */
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