Quick pam hack.
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@938 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
226
lib/auth/pam/pam.c
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226
lib/auth/pam/pam.c
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/*
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* Copyright (c) 1995, 1996 Kungliga Tekniska H<>gskolan (Royal Institute
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* of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* H<>gskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/* This code is extremely ugly, and would probably be better off
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beeing completely rewritten */
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#ifdef HAVE_CONFIG_H
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#include<config.h>
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RCSID("$Id$");
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#endif
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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 <pwd.h>
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#include <unistd.h>
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#define PAM_SM_AUTH
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#define PAM_SM_SESSION
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#include <security/pam_modules.h>
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#include <netinet/in.h>
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#include <krb.h>
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#include <kafs.h>
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static int
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cleanup(pam_handle_t *pamh, void *data, int error_code)
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{
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if(error_code != PAM_SUCCESS)
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dest_tkt();
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free(data);
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return PAM_SUCCESS;
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}
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static int
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doit(pam_handle_t *pamh, char *name, char *inst, char *pwd, char *tkt)
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{
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char realm[REALM_SZ];
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int ret;
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pam_set_data(pamh, "KRBTKFILE", strdup(tkt), cleanup);
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krb_set_tkt_string(tkt);
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krb_get_lrealm(realm, 1);
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ret = krb_verify_user(name, inst, realm, pwd, 1, NULL);
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memset(pwd, 0, strlen(pwd));
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switch(ret){
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case KSUCCESS:
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return PAM_SUCCESS;
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case KDC_PR_UNKNOWN:
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return PAM_USER_UNKNOWN;
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case SKDC_CANT:
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case SKDC_RETRY:
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case RD_AP_TIME:
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return PAM_AUTHINFO_UNAVAIL;
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default:
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return PAM_AUTH_ERR;
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}
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}
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static int
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auth_login(pam_handle_t *pamh, int flags, char *user, struct pam_conv *conv)
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{
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int ret;
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struct pam_message msg, *pmsg;
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struct pam_response *resp;
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char prompt[128];
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pmsg = &msg;
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msg.msg_style = PAM_PROMPT_ECHO_OFF;
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sprintf(prompt, "%s's Password: ", user);
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msg.msg = prompt;
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ret = conv->conv(1, (const struct pam_message**)&pmsg,
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&resp, conv->appdata_ptr);
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if(ret != PAM_SUCCESS)
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return ret;
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{
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char tkt[1024];
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struct passwd *pw = getpwnam(user);
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if(pw){
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sprintf(tkt, "%s%d", TKT_ROOT, pw->pw_uid);
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ret = doit(pamh, user, "", resp->resp, tkt);
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if(ret == PAM_SUCCESS)
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chown(tkt, pw->pw_uid, pw->pw_uid);
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}else
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ret = PAM_USER_UNKNOWN;
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memset(resp->resp, 0, strlen(resp->resp));
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free(resp->resp);
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free(resp);
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}
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return ret;
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}
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static int
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auth_su(pam_handle_t *pamh, int flags, char *user, struct pam_conv *conv)
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{
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int ret;
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struct passwd *pw;
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struct pam_message msg, *pmsg;
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struct pam_response *resp;
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char prompt[128];
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char name[ANAME_SZ], inst[INST_SZ];
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ret = pam_get_user(pamh, &user, "login: ");
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if(ret != PAM_SUCCESS)
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return ret;
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pw = getpwuid(getuid());
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if(strcmp(user, "root") == 0){
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strcpy(name, pw->pw_name);
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strcpy(inst, "root");
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}else{
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strcpy(name, user);
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inst[0] = 0;
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}
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pmsg = &msg;
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msg.msg_style = PAM_PROMPT_ECHO_OFF;
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sprintf(prompt, "%s%s%s's Password: ", name, inst[0]?".":"", inst);
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msg.msg = prompt;
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ret = conv->conv(1, (const struct pam_message**)&pmsg,
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&resp, conv->appdata_ptr);
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if(ret != PAM_SUCCESS)
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return ret;
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{
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char tkt[1024];
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sprintf(tkt, "%s_%s_to_%s", TKT_ROOT, pw->pw_name, user);
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ret = doit(pamh, name, inst, resp->resp, tkt);
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if(ret == PAM_SUCCESS)
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chown(tkt, pw->pw_uid, pw->pw_uid);
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memset(resp->resp, 0, strlen(resp->resp));
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free(resp->resp);
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free(resp);
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}
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return ret;
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}
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int
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pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
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{
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char *user;
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int ret;
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struct pam_conv *conv;
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ret = pam_get_user(pamh, &user, "login: ");
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if(ret != PAM_SUCCESS)
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return ret;
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ret = pam_get_item(pamh, PAM_CONV, (void*)&conv);
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if(ret != PAM_SUCCESS)
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return ret;
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if(getuid() != geteuid())
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return auth_su(pamh, flags, user, conv);
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else
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return auth_login(pamh, flags, user, conv);
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}
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int
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pam_sm_setcred(pam_handle_t *pamh, int flags, int argc, const char **argv)
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{
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return PAM_SUCCESS;
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}
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int
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pam_sm_open_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
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{
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char *tkt;
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pam_get_data(pamh, "KRBTKFILE", (const void**)&tkt);
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setenv("KRBTKFILE", tkt, 1);
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if(k_hasafs()){
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k_setpag();
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k_afsklog(0, 0);
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}
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return PAM_SUCCESS;
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}
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int
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pam_sm_close_session(pam_handle_t *pamh, int flags, int argc, const char **argv)
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{
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dest_tkt();
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if(k_hasafs())
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k_unlog();
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return PAM_SUCCESS;
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}
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