97 lines
2.0 KiB
C
97 lines
2.0 KiB
C
/*
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FILENAME : pam_panic_pw.c
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DESCRIPTION : Generates and saves password for pam_panic
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AUTHOR : Bandie, some Author of the glibc manpage
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DATE : 2018-03-27T02:34:08+02:00
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LICENSE : GNU-GPLv3
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <crypt.h>
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#include "config.h"
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int writePasswords(char pw[][99]){
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FILE *f = fopen(PPASSFILE, "w");
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if(f == NULL){
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fprintf(stderr, "ERROR opening file!\n");
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return 2;
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}
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fprintf(f, "%s\n%s\n", pw[0], pw[1]);
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fclose(f);
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chmod(PPASSFILE, 0600);
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return 0;
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}
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int main(void){
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time_t t;
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srand((unsigned) time(&t));
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unsigned long seed[2];
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char salt[] = "$6$........";
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const char *const seedchars =
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"./0123456789ABCDEFGHIJKLMNOPQRST"
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"UVWXYZabcdefghijklmnopqrstuvwxyz";
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char *password[2];
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char *pwvrf[2];
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char pw[2][99];
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char pwv[2][99];
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char *prompt[4] = {"Key password: ", "Panic password: ", "Retype key password: ","Retype panic password: "};
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int i;
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if(getuid() != 0){
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printf("Please run this program under root. Write access to %s is mandatory.\n", PPASSFILE); return 1;
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}
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for(int j=0; j<2; j++){
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seed[0] = time(&t);
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seed[1] = rand() ^ (seed[0] >> 14 & 0x30000);
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/* Turn it into printable characters from ‘seedchars’. */
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for (i = 0; i < 8; i++)
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salt[3+i] = seedchars[(seed[i/5] >> (i%5)*6) & 0x3f];
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/* Read in the user’s password and encrypt it. */
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password[j] = crypt(getpass(prompt[j]), salt);
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strcpy(pw[j], password[j]);
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for(int k=0; k<3; k++){
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pwvrf[j] = crypt(getpass(prompt[j+2]), pw[j]);
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strcpy(pwv[j], pwvrf[j]);
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int ok = strcmp(pw[j], pwv[j]) == 0;
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if(!ok){
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if(k==2){
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printf("Didn't work. Bye.\n");
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return 1;
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}else
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printf("Password didn't match. Try again.\n");
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}else
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break;
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}
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}
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/* Save the results. */
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return writePasswords(pw);
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}
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