Byteorder.net

Order from Chaos, eight bits at a time. ^* _

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Coming soon: A Whole New Set of Tubes.

^*Give or take two bits.

Comments welcome.

#include <stdio.h>
/* For getpass */
#include <unistd.h>
/* for malloc */
#include <stdlib.h>
/* For strdup */
#include <string.h>

#include <security/pam_appl.h>

int interact (int num_msg, const struct pam_message **msg,
                struct pam_response **resp, void *appdata_ptr) {

	struct pam_message *m = (struct pam_message*)*msg;
	struct pam_response *r = (struct pam_response *)calloc(num_msg,sizeof(struct pam_response));
	char *buf = (char *)calloc(1,PAM_MAX_RESP_SIZE);

	*resp = r;

	while (num_msg--) {
		switch(m->msg_style) {
			case PAM_PROMPT_ECHO_ON:
				printf("%s",m->msg);
				fgets(buf,PAM_MAX_RESP_SIZE-1,stdin);
				r->resp = (char *)strndup(buf,PAM_MAX_RESP_SIZE-1);
				m++;r++;
				break;
			case PAM_PROMPT_ECHO_OFF:
				r->resp = (char *)strndup(getpass(m->msg),PAM_MAX_RESP_SIZE-1);
				m++;r++;
				break;
			case PAM_ERROR_MSG:
				printf("Error: ");
			case PAM_TEXT_INFO:
				printf("%s\n",m->msg);
				m++;r++;
				break;
			default:
				break;
		}
	}
	free(buf);
	return PAM_SUCCESS;
}

int main (int argc, char **argv) {
	char *service = "system-auth";
	char *user = argv[1];
	int rval;

	struct pam_conv callback;
	pam_handle_t *hnd;

	callback.conv = interact;

	if (argc != 2) {
		printf("Please provide a username, and no other arguments.\n");
		return(1);
	}

	rval = pam_start(service,user,&callback,&hnd);
	if(rval == PAM_SUCCESS) {
		rval = pam_authenticate(hnd,0);
	} else {
		printf("%d: %s\n",rval,pam_strerror(hnd,rval));
	}
	if(rval == PAM_SUCCESS) {
		rval = pam_acct_mgmt(hnd,0);
	} else {
		 printf("%d: %s\n",rval,pam_strerror(hnd,rval));
	}

	/* It's a possible problem that PAM depends on the application to
		report auth failures. */
	if(rval == PAM_SUCCESS) {
		printf("Success.\n");
		pam_end(hnd,PAM_SUCCESS);
		return(0);
	} else {
		printf("Failure: %s\n",pam_strerror(hnd,rval));
		pam_end(hnd,PAM_AUTH_ERR);
		return(1);
	}
}