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/* $OpenBSD: htpasswd.c,v 1.17 2018/10/31 07:39:10 mestre Exp $ */
/*
* Copyright (c) 2014 Florian Obser <florian@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <readpassphrase.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
__dead void usage(void);
void nag(char*);
extern char *__progname;
__dead void
usage(void)
{
fprintf(stderr, "usage:\t%s [file] login\n", __progname);
fprintf(stderr, "\t%s -I [file]\n", __progname);
exit(1);
}
#define MAXNAG 5
int nagcount;
int
main(int argc, char** argv)
{
char tmpl[sizeof("/tmp/htpasswd-XXXXXXXXXX")];
char hash[_PASSWORD_LEN], pass[1024], pass2[1024];
char *line = NULL, *login = NULL, *tok;
int c, fd, loginlen, batch = 0;
FILE *in = NULL, *out = NULL;
const char *file = NULL;
size_t linesize = 0;
ssize_t linelen;
mode_t old_umask;
while ((c = getopt(argc, argv, "I")) != -1) {
switch (c) {
case 'I':
batch = 1;
break;
default:
usage();
/* NOT REACHED */
break;
}
}
argc -= optind;
argv += optind;
if ((batch && argc == 1) || (!batch && argc == 2)) {
if (unveil(argv[0], "rwc") == -1)
err(1, "unveil");
if (unveil("/tmp", "rwc") == -1)
err(1, "unveil");
}
if (pledge("stdio rpath wpath cpath flock tmppath tty", NULL) == -1)
err(1, "pledge");
if (batch) {
if (argc == 1)
file = argv[0];
else if (argc > 1)
usage();
else if (pledge("stdio", NULL) == -1)
err(1, "pledge");
if ((linelen = getline(&line, &linesize, stdin)) == -1)
err(1, "cannot read login:password from stdin");
line[linelen-1] = '\0';
if ((tok = strstr(line, ":")) == NULL)
errx(1, "cannot find ':' in input");
*tok++ = '\0';
if ((loginlen = asprintf(&login, "%s:", line)) == -1)
err(1, "asprintf");
if (strlcpy(pass, tok, sizeof(pass)) >= sizeof(pass))
errx(1, "password too long");
} else {
switch (argc) {
case 1:
if (pledge("stdio tty", NULL) == -1)
err(1, "pledge");
if ((loginlen = asprintf(&login, "%s:", argv[0])) == -1)
err(1, "asprintf");
break;
case 2:
file = argv[0];
if ((loginlen = asprintf(&login, "%s:", argv[1])) == -1)
err(1, "asprintf");
break;
default:
usage();
/* NOT REACHED */
break;
}
if (!readpassphrase("Password: ", pass, sizeof(pass),
RPP_ECHO_OFF))
err(1, "unable to read password");
if (!readpassphrase("Retype Password: ", pass2, sizeof(pass2),
RPP_ECHO_OFF)) {
explicit_bzero(pass, sizeof(pass));
err(1, "unable to read password");
}
if (strcmp(pass, pass2) != 0) {
explicit_bzero(pass, sizeof(pass));
explicit_bzero(pass2, sizeof(pass2));
errx(1, "passwords don't match");
}
explicit_bzero(pass2, sizeof(pass2));
}
if (crypt_newhash(pass, "bcrypt,a", hash, sizeof(hash)) != 0)
err(1, "can't generate hash");
explicit_bzero(pass, sizeof(pass));
if (file == NULL)
printf("%s%s\n", login, hash);
else {
if ((in = fopen(file, "r+")) == NULL) {
if (errno == ENOENT) {
old_umask = umask(S_IXUSR|
S_IWGRP|S_IRGRP|S_IXGRP|
S_IWOTH|S_IROTH|S_IXOTH);
if ((out = fopen(file, "w")) == NULL)
err(1, "cannot open password file for"
" reading or writing");
umask(old_umask);
} else
err(1, "cannot open password file for"
" reading or writing");
} else
if (flock(fileno(in), LOCK_EX|LOCK_NB) == -1)
errx(1, "cannot lock password file");
/* file already exits, copy content and filter login out */
if (out == NULL) {
strlcpy(tmpl, "/tmp/htpasswd-XXXXXXXXXX", sizeof(tmpl));
if ((fd = mkstemp(tmpl)) == -1)
err(1, "mkstemp");
if ((out = fdopen(fd, "w+")) == NULL)
err(1, "cannot open tempfile");
while ((linelen = getline(&line, &linesize, in))
!= -1) {
if (strncmp(line, login, loginlen) != 0) {
if (fprintf(out, "%s", line) == -1)
errx(1, "cannot write to temp "
"file");
nag(line);
}
}
}
if (fprintf(out, "%s%s\n", login, hash) == -1)
errx(1, "cannot write new password hash");
/* file already exists, overwrite it */
if (in != NULL) {
if (fseek(in, 0, SEEK_SET) == -1)
err(1, "cannot seek in password file");
if (fseek(out, 0, SEEK_SET) == -1)
err(1, "cannot seek in temp file");
if (ftruncate(fileno(in), 0) == -1)
err(1, "cannot truncate password file");
while ((linelen = getline(&line, &linesize, out))
!= -1)
if (fprintf(in, "%s", line) == -1)
errx(1, "cannot write to password "
"file");
if (fclose(in) == EOF)
err(1, "cannot close password file");
}
if (fclose(out) == EOF) {
if (in != NULL)
err(1, "cannot close temp file");
else
err(1, "cannot close password file");
}
if (in != NULL && unlink(tmpl) == -1)
err(1, "cannot delete temp file (%s)", tmpl);
}
if (nagcount >= MAXNAG)
warnx("%d more logins not using bcryt.", nagcount - MAXNAG);
exit(0);
}
void
nag(char* line)
{
const char *tok;
if (strtok(line, ":") != NULL)
if ((tok = strtok(NULL, ":")) != NULL)
if (strncmp(tok, "$2a$", 4) != 0 &&
strncmp(tok, "$2b$", 4) != 0) {
nagcount++;
if (nagcount <= MAXNAG)
warnx("%s doesn't use bcrypt."
" Update the password.", line);
}
}
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