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/* See LICENSE file for copyright and license details. */
#include "libsecauth.h"
#include <ctype.h>
#include <errno.h>
#include <string.h>
static char *
get_subhash(char *s, char **endp)
{
size_t depth = 0;
char *ret;
if (s[0] == '{' && s[1] == '$') {
s = ret = &s[2];
} else {
ret = s;
}
for (; s[0]; s++) {
if (s[0] == '{' && s[1] == '$' && s[-1] == '$') {
depth += 1;
} else if (s[0] == '}' && s[1] == '$' && s[-1] == '$') {
if (!depth)
return NULL;
if (!--depth) {
*s++ = '\0';
*s++ = '\0';
return ret;
}
} else if (s[0] == '$' && !depth) {
*s++ = '\0';
return ret;
}
}
return NULL;
}
static int
strtou32(const char *s, uint32_t *valp)
{
for (*valp = 0; isdigit(*s); s++) {
if (*valp > (UINT32_MAX - (uint32_t)(*s & 15)) / 10)
return -1;
*valp = *valp * 10 + (uint32_t)(*s & 15);
}
return *s ? -1 : 0;
}
int
libsecauth_parse_spec(struct libsecauth_spec *spec, char *s)
{
const char *client_rounds, *server_rounds;
size_t slen = strlen(s);
memset(spec, 0, sizeof(*spec));
if (strncmp(s, "$secauth$", sizeof("$secauth$") - 1))
goto invalid;
s = &s[sizeof("$secauth$") - 1];
spec->prehash = get_subhash(s, &s);
spec->xferhash = get_subhash(s, &s);
client_rounds = get_subhash(s, &s);
server_rounds = get_subhash(s, &s);
spec->posthash = get_subhash(s, &s);
spec->expected = get_subhash(s, &s);
if (client_rounds && strtou32(client_rounds, &spec->client_rounds))
goto invalid;
if (server_rounds && strtou32(server_rounds, &spec->server_rounds))
goto invalid;
if (*s)
goto invalid;
return 0;
invalid:
memset(s, 0, slen);
errno = EINVAL;
return -1;
}
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