freebsd-dev/crypto/openssh/radix.c
2000-02-24 14:29:47 +00:00

286 lines
6.3 KiB
C

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