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/* See LICENSE file for copyright and license details. */
#include "libsecauth.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define PEPPER "pepper"
static char *
server_lookup_hash(void)
{
char *settings;
size_t size, len;
ssize_t r;
int fd;
fd = open("democonfig", O_RDONLY);
if (fd < 0) {
perror("open");
return NULL;
}
settings = NULL;
size = 0;
for (len = 0;; len += (size_t)r) {
if (len == size) {
settings = realloc(settings, size += 128);
if (!settings) {
perror("realloc");
return NULL;
}
}
r = read(fd, &settings[len], size - len);
if (r <= 0) {
if (!r)
break;
perror("read");
return NULL;
}
}
close(fd);
if (!len || settings[len - 1] != '\n') {
fprintf(stderr, "./democonfig is corrupt\n");
return NULL;
}
settings[len - 1] = '\0';
return settings;
}
int
main(int argc, char *argv[])
{
struct libsecauth_spec spec;
char *message, *settings, *expected;
size_t size, off;
int fd;
ssize_t w;
int r;
if (argc != 2) {
fprintf(stderr, "usage: %s password", argv[0]);
return 1;
}
/* -- SERVER -- */
settings = server_lookup_hash();
if (!settings)
return 1;
if (libsecauth_parse_spec(&spec, settings)) {
perror("libsecauth_parse_spec");
return 1;
}
spec.posthash = NULL;
spec.expected = NULL;
spec.client_rounds -= spec.client_rounds > 0;
spec.server_rounds = 0;
size = libsecauth_format_spec(&spec, NULL, 0);
message = malloc(size);
if (!message) {
perror("malloc");
return 1;
}
libsecauth_format_spec(&spec, message, size);
free(settings);
/* -- CLIENT -- */
settings = message;
if (libsecauth_parse_spec(&spec, settings)) {
perror("libsecauth_parse_spec");
return 1;
}
message = libsecauth_client_hash(&spec, argv[1]);
if (!message) {
perror("libsecauth_client_hash");
return 1;
}
free(settings);
/* -- SERVER -- */
settings = server_lookup_hash();
if (!settings)
return 1;
if (libsecauth_parse_spec(&spec, settings)) {
perror("libsecauth_parse_spec");
return 1;
}
spec.server_rounds += spec.client_rounds > 0;
spec.client_rounds -= spec.client_rounds > 0;
r = libsecauth_server_hash(&spec, message, PEPPER, NULL);
if (r < 0) {
perror("libsecauth_server_hash");
return 1;
} else if (!r) {
free(settings);
free(message);
printf("Incorrect password\n");
return 0;
}
printf("Login OK\n");
expected = NULL;
if (!spec.client_rounds) {
spec.xferhash = "$1$newsalt1$";
spec.posthash = "$6$rounds=1000$newsalt2$";
spec.expected = NULL;
spec.server_rounds = 100;
if (libsecauth_server_hash(&spec, message, PEPPER, &expected) < 0) {
perror("libsecauth_server_hash");
return 1;
}
spec.client_rounds = spec.server_rounds;
spec.server_rounds = 0;
spec.expected = expected;
printf("password rehashed\n");
}
free(message);
size = libsecauth_format_spec(&spec, NULL, 0);
message = malloc(size);
if (!message) {
perror("malloc");
return 1;
}
libsecauth_format_spec(&spec, message, size);
free(settings);
free(expected);
message[size - 1] = '\n';
fd = open("democonfig", O_WRONLY | O_TRUNC, 0600);
if (fd < 0) {
perror("open");
return 1;
}
for (off = 0; off < size; off += (size_t)w) {
w = write(fd, &message[off], size - off);
if (w <= 0) {
perror("write");
return 1;
}
}
close(fd);
free(message);
return 0;
}
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