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Removed old interactive version og checkpw.

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Johannes Findeisen 2024-08-10 15:29:58 +02:00
commit cf59e5bb35
1 changed files with 0 additions and 97 deletions
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checkpw_interactive.c
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@ -1,97 +0,0 @@
/*
* checkpw is a program that checks the validity of a users password on a
* Linux/PAM-based system.
*
* Usage: checkpw
*
* Returns 0 on success, 1 otherwise.
*
* License: MIT (see LICENSE)
*/
#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Custom data structure to hold user-entered password
struct pam_credentials {
const char *password;
};
// PAM conversation function to supply the password
int pam_conversation(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata_ptr) {
struct pam_response *response = NULL;
struct pam_credentials *credentials = (struct pam_credentials *)appdata_ptr;
int i;
response = (struct pam_response *)malloc(sizeof(struct pam_response) * num_msg);
if (response == NULL) {
return PAM_CONV_ERR;
}
for (i = 0; i < num_msg; i++) {
if (msg[i]->msg_style == PAM_PROMPT_ECHO_OFF || msg[i]->msg_style == PAM_PROMPT_ECHO_ON) {
response[i].resp = strdup(credentials->password);
response[i].resp_retcode = 0;
}
}
*resp = response;
return PAM_SUCCESS;
}
int authenticate(const char *username, const char *password) {
pam_handle_t *pamh = NULL;
int retval;
struct pam_credentials credentials = { password };
struct pam_conv conv = { pam_conversation, &credentials };
retval = pam_start("login", username, &conv, &pamh);
if (retval == PAM_SUCCESS) {
retval = pam_authenticate(pamh, 0); // Attempt to authenticate
}
if (retval == PAM_SUCCESS) {
retval = pam_acct_mgmt(pamh, 0); // Check account validity
}
if (pam_end(pamh, retval) != PAM_SUCCESS) {
pamh = NULL;
fprintf(stderr, "Failed to release PAM authenticator\n");
exit(1);
}
return (retval == PAM_SUCCESS ? 0 : 1); // 0 for success, 1 for failure
}
int main() {
char username[256];
char *password;
// Prompt user for a username
printf("Username: ");
if (fgets(username, sizeof(username), stdin) == NULL) {
fprintf(stderr, "Failed to read username\n");
exit(1);
}
// Remove the trailing newline character if it exists
username[strcspn(username, "\n")] = '\0';
// Prompt user for a password
password = getpass("Password: ");
// Authenticate the user
if (authenticate(username, password) == 0) {
printf("Authenticated successfully.\n");
return 0;
} else {
printf("Authentication failed.\n");
return 1;
}
}