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/* verify.c: The opieverify() library function.
%%% copyright-cmetz-96
This software is Copyright 1996-1997 by Craig Metz, All Rights Reserved.
The Inner Net License Version 2 applies to this software.
You should have received a copy of the license with this software. If
you didn't get a copy, you may request one from <license@inner.net>.
History:
Modified by cmetz for OPIE 2.31. Renamed "init" and "RESPONSE_INIT"
to "init-hex" and "RESPONSE_INIT_HEX". Removed active attack
protection support.
Created by cmetz for OPIE 2.3 using the old verify.c as a guide.
*/
#include "opie_cfg.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif /* HAVE_STRING_H */
#include "opie.h"
#define RESPONSE_STANDARD 0
#define RESPONSE_WORD 1
#define RESPONSE_HEX 2
#define RESPONSE_INIT_HEX 3
#define RESPONSE_INIT_WORD 4
#define RESPONSE_UNKNOWN 5
struct _rtrans {
int type;
char *name;
};
static struct _rtrans rtrans[] = {
{ RESPONSE_WORD, "word" },
{ RESPONSE_HEX, "hex" },
{ RESPONSE_INIT_HEX, "init-hex" },
{ RESPONSE_INIT_WORD, "init-word" },
{ RESPONSE_STANDARD, "" },
{ RESPONSE_UNKNOWN, NULL }
};
static char *algids[] = { NULL, NULL, NULL, "sha1", "md4", "md5" };
static int changed FUNCTION((opie), struct opie *opie)
{
struct opie opie2;
memset(&opie2, 0, sizeof(struct opie));
opie2.opie_principal = opie->opie_principal;
if (__opiereadrec(&opie2))
return 1;
if ((opie2.opie_n != opie->opie_n) || strcmp(opie2.opie_val, opie->opie_val) || strcmp(opie2.opie_seed, opie->opie_seed))
return 1;
memset(&opie2, 0, sizeof(struct opie));
return 0;
}
int opieverify FUNCTION((opie, response), struct opie *opie AND char *response)
{
int i, rval = -1;
char *c;
char key[8], fkey[8], lastkey[8];
struct opie nopie;
if (!opie || !response)
goto verret;
if (!opie->opie_principal)
#if DEBUG
abort();
#else /* DEBUG */
goto verret;
#endif /* DEBUG */
if (!opieatob8(lastkey, opie->opie_val))
goto verret;
if (c = strchr(response, ':')) {
*(c++) = 0;
{
struct _rtrans *r;
for (r = rtrans; r->name && strcmp(r->name, response); r++);
i = r->type;
}
} else
i = RESPONSE_STANDARD;
switch(i) {
case RESPONSE_STANDARD:
i = 1;
if (opieetob(key, response) == 1) {
memcpy(fkey, key, sizeof(key));
opiehash(fkey, MDX);
i = memcmp(fkey, lastkey, sizeof(key));
}
if (i && opieatob8(key, response)) {
memcpy(fkey, key, sizeof(key));
opiehash(fkey, MDX);
i = memcmp(fkey, lastkey, sizeof(key));
}
break;
case RESPONSE_WORD:
i = 1;
if (opieetob(key, c) == 1) {
memcpy(fkey, key, sizeof(key));
opiehash(fkey, MDX);
i = memcmp(fkey, lastkey, sizeof(key));
}
break;
case RESPONSE_HEX:
i = 1;
if (opieatob8(key, c)) {
memcpy(fkey, key, sizeof(key));
opiehash(fkey, MDX);
i = memcmp(fkey, lastkey, sizeof(key));
}
break;
case RESPONSE_INIT_HEX:
case RESPONSE_INIT_WORD:
{
char *c2;
char newkey[8];
char buf[OPIE_SEED_MAX + 48 + 1];
if (!(c2 = strchr(c, ':')))
goto verret;
*(c2++) = 0;
if (i == RESPONSE_INIT_HEX) {
if (!opieatob8(key, c))
goto verret;
} else {
if (opieetob(key, c) != 1)
goto verret;
}
memcpy(fkey, key, sizeof(key));
opiehash(fkey, MDX);
if (memcmp(fkey, lastkey, sizeof(key)))
goto verret;
if (changed(opie))
goto verret;
opie->opie_n--;
if (!opiebtoa8(opie->opie_val, key))
goto verret;
if (__opiewriterec(opie))
goto verret;
if (!(c2 = strchr(c = c2, ':')))
goto verret;
*(c2++) = 0;
{
int j;
if (_opieparsechallenge(c, &j, &(opie->opie_n), &(opie->opie_seed)) || (j != MDX))
goto verret;
}
if (!(c2 = strchr(c = c2, ':')))
goto verret;
*(c2++) = 0;
if (i == RESPONSE_INIT_HEX) {
if (!opieatob8(newkey, c))
goto verret;
} else {
if (opieetob(newkey, c) != 1)
goto verret;
}
}
goto verwrt;
case RESPONSE_UNKNOWN:
rval = 1;
goto verret;
default:
rval = -1;
goto verret;
}
if (i) {
rval = 1;
goto verret;
}
if (changed(opie))
goto verret;
opie->opie_n--;
verwrt:
if (!opiebtoa8(opie->opie_val, key))
goto verret;
rval = __opiewriterec(opie);
verret:
opieunlock();
memset(opie, 0, sizeof(struct opie));
return rval;
}
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