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Add passwd(1) -H option.

This commit is contained in:
Jonas 'Sortie' Termansen 2023-04-23 14:53:43 +02:00
parent c77745e447
commit b029127df5
2 changed files with 55 additions and 60 deletions
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6
utils/passwd.1
View File

@ -6,6 +6,7 @@
.Nd change user password
.Sh SYNOPSIS
.Nm
.Op Fl H
.Op Fl c Ar cipher
.Op Ar user
.Sh DESCRIPTION
@ -19,6 +20,11 @@ The options are as follows:
.It Fl c Ar cipher
Hash the password using the specified
.Ar cipher .
.It Fl H
Read a password from the standard input and write the
.Xr crypt_newpass 3
hash to the standard output.
The password database is unchanged.
.El
.Sh FILES
.Bl -tag -width "/etc/passwd" -compact

109
utils/passwd.c
View File

@ -34,79 +34,67 @@
static void password(char* buffer,
size_t buffer_size,
const char* whose,
const char* question)
const char* question,
bool require_tty)
{
if ( !isatty(0) )
bool is_tty = isatty(0);
if ( !require_tty && is_tty )
errx(1, "Input is not a terminal");
unsigned int termmode;
gettermmode(0, &termmode);
settermmode(0, termmode & ~TERMMODE_ECHO);
if ( whose )
printf("%s's ", whose);
printf("%s ", question);
fflush(stdout);
fflush(stdin);
unsigned int termmode = 0;
if ( is_tty )
{
gettermmode(0, &termmode);
settermmode(0, termmode & ~TERMMODE_ECHO);
if ( whose )
printf("%s's ", whose);
printf("%s ", question);
fflush(stdout);
fflush(stdin);
}
// TODO: This may leave a copy of the password in the stdio buffer.
fgets(buffer, buffer_size, stdin);
fflush(stdin);
printf("\n");
if ( is_tty )
{
fflush(stdin);
printf("\n");
settermmode(0, termmode);
}
size_t buffer_length = strlen(buffer);
if ( buffer_length && buffer[buffer_length-1] == '\n' )
buffer[--buffer_length] = '\0';
settermmode(0, termmode);
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
int main(int argc, char* argv[])
{
const char* cipher = "blowfish,a";
bool hash_password = false;
for ( int i = 1; i < argc; i++ )
int opt;
while ( (opt = getopt(argc, argv, "c:H")) != -1 )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
switch ( opt )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
case 'c':
if ( !*(cipher = arg + 1) )
{
if ( i + 1 == argc )
errx(125, "option requires an argument -- 'c'");
cipher = argv[i+1];
argv[++i] = NULL;
}
arg = "c";
break;
default:
errx(1, "unknown option -- '%c'", c);
}
}
else
{
errx(1, "unrecognized option: %s", arg);
case 'c': cipher = optarg; break;
case 'H': hash_password = true; break;
default: return 1;
}
}
compact_arguments(&argc, &argv);
if ( hash_password )
{
if ( argc - optind )
errx(1, "Unexpected extra operand");
char pass[128];
password(pass, sizeof(pass), NULL, "Enter password (will not echo)",
false);
fgets(pass, sizeof(pass), stdin);
char newhash[128];
if ( crypt_newhash(pass, cipher, newhash, sizeof(newhash)) < 0 )
err(1, "crypt_newhash");
if ( printf("%s\n", newhash) < 0 || fflush(stdout) == EOF )
err(1, "stdout");
return 0;
}
uid_t my_uid = getuid();
char* my_username = getlogin();
@ -116,9 +104,9 @@ int main(int argc, char* argv[])
err(1, "stdup");
const char* username;
if ( argc <= 1 )
if ( argc - optind <= 1 )
username = my_username;
else if ( argc <= 2 )
else if ( argc - optind <= 2 )
username = argv[1];
else
errx(1, "Unexpected extra operand");
@ -139,16 +127,17 @@ int main(int argc, char* argv[])
{
char current[128];
password(current, sizeof(current), pwd->pw_name,
"current password (will not echo)");
"current password (will not echo)", true);
if ( crypt_checkpass(current, pwd->pw_passwd) < 0 )
errx(1, "Wrong password for '%s'", pwd->pw_name);
explicit_bzero(current, sizeof(current));
}
char first[128];
password(first, sizeof(first), NULL, "Enter new password (will not echo)");
password(first, sizeof(first), NULL, "Enter new password (will not echo)",
true);
char second[128];
password(second, sizeof(second), NULL, "Enter new password (again)");
password(second, sizeof(second), NULL, "Enter new password (again)", true);
if ( strcmp(first, second) != 0 )
errx(1, "Passwords don't match");
explicit_bzero(second, sizeof(second));