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/* mkpasswd.c - encrypt the given passwd using salt
*
* Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
* Copyright 2013 Kyungwan Han <asura321@gmail.com>
*
* No Standard
USE_MKPASSWD(NEWTOY(mkpasswd, ">2S:m:P#=0<0", TOYFLAG_USR|TOYFLAG_BIN))
config MKPASSWD
bool "mkpasswd"
default n
help
usage: mkpasswd [OPTIONS] [PASSWORD] [SALT]
Crypt PASSWORD using crypt(3)
-P N Read password from fd N
-m TYPE Encryption method, when TYPE='help', then show the methods available
-S SALT
*/
#define FOR_mkpasswd
#include "toys.h"
GLOBALS(
long pfd;
char *method;
char *salt;
)
/*
* validate the salt provided by user.
* the allowed character set for salt is [./A-Za-z0-9]
*/
static void is_salt_valid(char *salt)
{
regex_t rp;
regmatch_t rm[1];
char *regex = "[./A-Za-z0-9]*"; //salt REGEX
xregcomp(&rp, regex, REG_NEWLINE);
/* compare string against pattern -- remember that patterns
are anchored to the beginning of the line */
if (regexec(&rp, salt, 1, rm, 0) == 0 && rm[0].rm_so == 0
&& rm[0].rm_eo == strlen(salt))
return;
error_exit("salt should be in character set [./A-Za-z0-9]");
}
void mkpasswd_main(void)
{
int offset = 0;
char salt[MAX_SALT_LEN] = {0,};
if (!(toys.optflags & FLAG_m)) TT.method = "des";
else if (!strcmp(TT.method, "help")) {
xprintf("Available encryption methods are:\n"
" des\n md5\n sha256\n sha512\n");
return;
}
// If arguments are there, then the second argument is Salt, can be NULL also
if ((toys.optc == 2) && !(toys.optflags & FLAG_S)) TT.salt = toys.optargs[1];
offset= get_salt(salt, TT.method);
if (offset == -1) error_exit("unknown encryption method");
if (TT.salt) {
is_salt_valid(TT.salt);
snprintf(salt + offset, MAX_SALT_LEN - offset, "%s", TT.salt);
}
if (toys.optflags & FLAG_P) {
if (dup2(TT.pfd, STDIN_FILENO) == -1) perror_exit("fd");
close(TT.pfd);
}
if (!toys.optc) {
if (isatty(STDIN_FILENO)) {
if (read_password(toybuf, sizeof(toybuf), "Password: "))
perror_exit("password read failed");
} else {
// read from the given FD
int i = 0;
while (1) {
int ret = read(0, &toybuf[i], 1);
if ( ret < 0 ) perror_exit("password read failed");
else if (ret == 0 || toybuf[i] == '\n' || toybuf[i] == '\r' ||
sizeof(toybuf) == i+1) {
toybuf[i] = '\0';
break;
}
i++;
}
}
} else snprintf(toybuf, sizeof(toybuf), "%s", toys.optargs[0]);
// encrypt & print the password
xprintf("%s\n",crypt(toybuf, salt));
}
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