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/*
* Copyright 2013 Red Hat, Inc.
*
* This Program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This Program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this Program; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <dlfcn.h>
#include <errno.h>
#include <limits.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <security/pam_appl.h>
static const struct {
int value;
const char *name;
} pam_errors[] = {
{PAM_SUCCESS, "SUCCESS"},
{PAM_SUCCESS, "0"},
{PAM_OPEN_ERR, "OPEN_ERR"},
{PAM_SYMBOL_ERR, "SYMBOL_ERR"},
{PAM_SERVICE_ERR, "SERVICE_ERR"},
{PAM_SYSTEM_ERR, "SYSTEM_ERR"},
{PAM_BUF_ERR, "BUF_ERR"},
{PAM_PERM_DENIED, "PERM_DENIED"},
{PAM_AUTH_ERR, "AUTH_ERR"},
{PAM_CRED_INSUFFICIENT, "CRED_INSUFFICIENT"},
{PAM_AUTHINFO_UNAVAIL, "AUTHINFO_UNAVAIL"},
{PAM_USER_UNKNOWN, "USER_UNKNOWN"},
{PAM_MAXTRIES, "MAXTRIES"},
{PAM_NEW_AUTHTOK_REQD, "NEW_AUTHTOK_REQD"},
{PAM_ACCT_EXPIRED, "ACCT_EXPIRED"},
{PAM_SESSION_ERR, "SESSION_ERR"},
{PAM_CRED_UNAVAIL, "CRED_UNAVAIL"},
{PAM_CRED_EXPIRED, "CRED_EXPIRED"},
{PAM_CRED_ERR, "CRED_ERR"},
{PAM_NO_MODULE_DATA, "NO_MODULE_DATA"},
{PAM_CONV_ERR, "CONV_ERR"},
{PAM_AUTHTOK_ERR, "AUTHTOK_ERR"},
{PAM_AUTHTOK_RECOVERY_ERR, "AUTHTOK_RECOVERY_ERR"},
{PAM_AUTHTOK_LOCK_BUSY, "AUTHTOK_LOCK_BUSY"},
{PAM_AUTHTOK_DISABLE_AGING, "AUTHTOK_DISABLE_AGING"},
{PAM_TRY_AGAIN, "TRY_AGAIN"},
{PAM_IGNORE, "IGNORE"},
{PAM_ABORT, "ABORT"},
{PAM_AUTHTOK_EXPIRED, "AUTHTOK_EXPIRED"},
{PAM_MODULE_UNKNOWN, "UNKNOWN"},
{PAM_BAD_ITEM, "BAD_ITEM"},
{PAM_CONV_AGAIN, "CONV_AGAIN"},
{PAM_INCOMPLETE, "INCOMPLETE"},
};
typedef struct pam_handle {
char *authtok, errbuf[LINE_MAX];
struct pam_conv conv;
int auth, acct;
} pam_handle_t;
static int
pam_numerror(const char *name)
{
unsigned int i, l;
for (i = 0; i < sizeof(pam_errors) / sizeof(pam_errors[0]); i++) {
l = strlen(pam_errors[i].name);
if (strncasecmp(pam_errors[i].name, name, l) == 0) {
return pam_errors[i].value;
}
}
return -1;
}
const char *
pam_strerror(pam_handle_t *pamh, int errnum)
{
unsigned int i;
for (i = 0; i < sizeof(pam_errors) / sizeof(pam_errors[0]); i++) {
if (pam_errors[i].value == errnum) {
return pam_errors[i].name;
}
}
snprintf(pamh->errbuf, sizeof(pamh->errbuf), "PAM error %d", errnum);
return pamh->errbuf;
}
int
pam_start(const char *service_name, const char *user,
const struct pam_conv *pam_conversation, pam_handle_t **pamh)
{
FILE *fp;
char buf[LINE_MAX], *p, *q;
pam_handle_t *ret;
ret = calloc(1, sizeof(*ret));
if (ret == NULL) {
return PAM_BUF_ERR;
}
ret->conv = *pam_conversation;
if (getenv("WRAPPERS_PAM_CREDS") == NULL) {
return PAM_ABORT;
}
fp = fopen(getenv("WRAPPERS_PAM_CREDS"), "r");
if (fp == NULL) {
free(ret);
return PAM_ABORT;
}
while (fgets(buf, sizeof(buf), fp) != NULL) {
buf[strcspn(buf, "\r\n")] = '\0';
if ((strlen(buf) > strlen(user)) &&
(strncmp(user, buf, strlen(user)) == 0) &&
(buf[strlen(user)] == ':')) {
p = buf + strcspn(buf, ":");
if (*p != '\0') {
p++;
q = p + strcspn(p, ":");
ret->authtok = strndup(p, q - p);
p = q;
}
if (*p != '\0') {
p++;
q = p + strcspn(p, ":");
ret->auth = pam_numerror(p);
p = q;
}
if (*p != '\0') {
p++;
q = p + strcspn(p, ":");
ret->acct = pam_numerror(p);
p = q;
}
break;
}
}
fclose(fp);
*pamh = ret;
return PAM_SUCCESS;
}
int
pam_end(pam_handle_t *pamh, int pam_status)
{
if (pamh == NULL) {
return PAM_SYSTEM_ERR;
}
free(pamh->authtok);
free(pamh);
return PAM_SUCCESS;
}
int
pam_authenticate(pam_handle_t *pamh, int flags)
{
struct pam_response *resp;
struct pam_message messages[] = {
{.msg_style = PAM_PROMPT_ECHO_OFF, .msg = "Password: "},
};
const struct pam_message *msgs = &messages[0];
int ret;
resp = NULL;
if (pamh == NULL) {
return PAM_SYSTEM_ERR;
}
if (pamh->authtok == NULL) {
return pamh->auth ? pamh->auth : PAM_USER_UNKNOWN;
}
if (pamh->conv.conv == NULL) {
return PAM_CONV_ERR;
}
ret = pamh->conv.conv(1, &msgs, &resp, pamh->conv.appdata_ptr);
if (ret != PAM_SUCCESS) {
return ret;
}
if (strcmp(pamh->authtok, resp->resp) == 0) {
ret = pamh->auth;
} else {
ret = PAM_AUTH_ERR;
}
free(resp->resp);
free(resp);
return ret;
}
int
pam_acct_mgmt(pam_handle_t *pamh, int flags)
{
if (pamh == NULL) {
return PAM_SYSTEM_ERR;
}
return pamh->acct;
}
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