679 lines
17 KiB
C
679 lines
17 KiB
C
/*
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* Copyright (c) 1995-2001 Kungliga Tekniska Högskolan
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* (Royal Institute 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. 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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#include "sia_locl.h"
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RCSID("$Id: sia.c,v 1.36 2001/09/13 01:19:14 assar Exp $");
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int
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siad_init(void)
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{
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return SIADSUCCESS;
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}
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int
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siad_chk_invoker(void)
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{
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SIA_DEBUG(("DEBUG", "siad_chk_invoker"));
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return SIADFAIL;
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}
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int
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siad_ses_init(SIAENTITY *entity, int pkgind)
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{
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struct state *s = malloc(sizeof(*s));
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SIA_DEBUG(("DEBUG", "siad_ses_init"));
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if(s == NULL)
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return SIADFAIL;
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memset(s, 0, sizeof(*s));
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#ifdef SIA_KRB5
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{
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krb5_error_code ret;
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ret = krb5_init_context(&s->context);
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if (ret)
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return SIADFAIL;
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}
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#endif
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entity->mech[pkgind] = (int*)s;
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return SIADSUCCESS;
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}
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static int
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setup_name(SIAENTITY *e, prompt_t *p)
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{
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SIA_DEBUG(("DEBUG", "setup_name"));
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e->name = malloc(SIANAMEMIN + 1);
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if(e->name == NULL){
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SIA_DEBUG(("DEBUG", "failed to malloc %u bytes", SIANAMEMIN+1));
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return SIADFAIL;
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}
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p->prompt = (unsigned char*)"login: ";
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p->result = (unsigned char*)e->name;
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p->min_result_length = 1;
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p->max_result_length = SIANAMEMIN;
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p->control_flags = 0;
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return SIADSUCCESS;
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}
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static int
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setup_password(SIAENTITY *e, prompt_t *p)
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{
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SIA_DEBUG(("DEBUG", "setup_password"));
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e->password = malloc(SIAMXPASSWORD + 1);
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if(e->password == NULL){
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SIA_DEBUG(("DEBUG", "failed to malloc %u bytes", SIAMXPASSWORD+1));
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return SIADFAIL;
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}
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p->prompt = (unsigned char*)"Password: ";
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p->result = (unsigned char*)e->password;
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p->min_result_length = 0;
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p->max_result_length = SIAMXPASSWORD;
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p->control_flags = SIARESINVIS;
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return SIADSUCCESS;
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}
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static int
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doauth(SIAENTITY *entity, int pkgind, char *name)
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{
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struct passwd pw, *pwd;
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char pwbuf[1024];
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struct state *s = (struct state*)entity->mech[pkgind];
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#ifdef SIA_KRB5
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krb5_realm *realms, *r;
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krb5_principal principal;
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krb5_ccache ccache;
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krb5_error_code ret;
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#endif
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#ifdef SIA_KRB4
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char realm[REALM_SZ];
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char *toname, *toinst;
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int ret;
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struct passwd fpw, *fpwd;
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char fpwbuf[1024];
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int secure;
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#endif
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if(getpwnam_r(name, &pw, pwbuf, sizeof(pwbuf), &pwd) != 0){
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SIA_DEBUG(("DEBUG", "failed to getpwnam(%s)", name));
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return SIADFAIL;
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}
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#ifdef SIA_KRB5
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ret = krb5_get_default_realms(s->context, &realms);
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for (r = realms; *r != NULL; ++r) {
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krb5_make_principal (s->context, &principal, *r, entity->name, NULL);
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if(krb5_kuserok(s->context, principal, entity->name))
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break;
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}
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krb5_free_host_realm (s->context, realms);
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if (*r == NULL)
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return SIADFAIL;
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sprintf(s->ticket, "FILE:/tmp/krb5_cc%d_%d", pwd->pw_uid, getpid());
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ret = krb5_cc_resolve(s->context, s->ticket, &ccache);
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if(ret)
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return SIADFAIL;
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#endif
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#ifdef SIA_KRB4
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snprintf(s->ticket, sizeof(s->ticket),
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"%s%u_%u", TKT_ROOT, (unsigned)pwd->pw_uid, (unsigned)getpid());
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krb_get_lrealm(realm, 1);
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toname = name;
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toinst = "";
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if(entity->authtype == SIA_A_SUAUTH){
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uid_t ouid;
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#ifdef HAVE_SIAENTITY_OUID
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ouid = entity->ouid;
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#else
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ouid = getuid();
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#endif
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if(getpwuid_r(ouid, &fpw, fpwbuf, sizeof(fpwbuf), &fpwd) != 0){
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SIA_DEBUG(("DEBUG", "failed to getpwuid(%u)", ouid));
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return SIADFAIL;
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}
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snprintf(s->ticket, sizeof(s->ticket), "%s_%s_to_%s_%d",
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TKT_ROOT, fpwd->pw_name, pwd->pw_name, getpid());
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if(strcmp(pwd->pw_name, "root") == 0){
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toname = fpwd->pw_name;
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toinst = pwd->pw_name;
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}
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}
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if(entity->authtype == SIA_A_REAUTH)
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snprintf(s->ticket, sizeof(s->ticket), "%s", tkt_string());
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krb_set_tkt_string(s->ticket);
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setuid(0); /* XXX fix for fix in tf_util.c */
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if(krb_kuserok(toname, toinst, realm, name)){
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SIA_DEBUG(("DEBUG", "%s.%s@%s is not allowed to login as %s",
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toname, toinst, realm, name));
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return SIADFAIL;
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}
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#endif
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#ifdef SIA_KRB5
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ret = krb5_verify_user_lrealm(s->context, principal, ccache,
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entity->password, 1, NULL);
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if(ret){
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/* if this is most likely a local user (such as
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root), just silently return failure when the
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principal doesn't exist */
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if(ret != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN &&
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ret != KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN)
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SIALOG("WARNING", "krb5_verify_user(%s): %s",
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entity->name, error_message(ret));
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return SIADFAIL;
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}
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#endif
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#ifdef SIA_KRB4
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if (getuid () == 0)
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secure = KRB_VERIFY_SECURE;
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else
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secure = KRB_VERIFY_NOT_SECURE;
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ret = krb_verify_user(toname, toinst, realm,
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entity->password, secure, NULL);
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if(ret){
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SIA_DEBUG(("DEBUG", "krb_verify_user: %s", krb_get_err_text(ret)));
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if(ret != KDC_PR_UNKNOWN)
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/* since this is most likely a local user (such as
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root), just silently return failure when the
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principal doesn't exist */
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SIALOG("WARNING", "krb_verify_user(%s.%s): %s",
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toname, toinst, krb_get_err_text(ret));
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return SIADFAIL;
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}
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#endif
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if(sia_make_entity_pwd(pwd, entity) == SIAFAIL)
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return SIADFAIL;
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s->valid = 1;
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return SIADSUCCESS;
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}
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static int
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common_auth(sia_collect_func_t *collect,
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SIAENTITY *entity,
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int siastat,
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int pkgind)
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{
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prompt_t prompts[2], *pr;
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char *name;
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SIA_DEBUG(("DEBUG", "common_auth"));
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if((siastat == SIADSUCCESS) && (geteuid() == 0))
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return SIADSUCCESS;
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if(entity == NULL) {
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SIA_DEBUG(("DEBUG", "entity == NULL"));
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return SIADFAIL | SIADSTOP;
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}
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name = entity->name;
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if(entity->acctname)
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name = entity->acctname;
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if((collect != NULL) && entity->colinput) {
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int num;
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pr = prompts;
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if(name == NULL){
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if(setup_name(entity, pr) != SIADSUCCESS)
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return SIADFAIL;
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pr++;
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}
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if(entity->password == NULL){
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if(setup_password(entity, pr) != SIADSUCCESS)
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return SIADFAIL;
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pr++;
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}
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num = pr - prompts;
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if(num == 1){
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if((*collect)(240, SIAONELINER, (unsigned char*)"", num,
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prompts) != SIACOLSUCCESS){
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SIA_DEBUG(("DEBUG", "collect failed"));
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return SIADFAIL | SIADSTOP;
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}
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} else if(num > 0){
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if((*collect)(0, SIAFORM, (unsigned char*)"", num,
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prompts) != SIACOLSUCCESS){
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SIA_DEBUG(("DEBUG", "collect failed"));
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return SIADFAIL | SIADSTOP;
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}
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}
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}
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if(name == NULL)
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name = entity->name;
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if(name == NULL || name[0] == '\0'){
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SIA_DEBUG(("DEBUG", "name is null"));
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return SIADFAIL;
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}
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if(entity->password == NULL || strlen(entity->password) > SIAMXPASSWORD){
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SIA_DEBUG(("DEBUG", "entity->password is null"));
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return SIADFAIL;
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}
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return doauth(entity, pkgind, name);
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}
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int
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siad_ses_authent(sia_collect_func_t *collect,
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SIAENTITY *entity,
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int siastat,
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int pkgind)
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{
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SIA_DEBUG(("DEBUG", "siad_ses_authent"));
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return common_auth(collect, entity, siastat, pkgind);
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}
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int
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siad_ses_estab(sia_collect_func_t *collect,
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SIAENTITY *entity, int pkgind)
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{
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SIA_DEBUG(("DEBUG", "siad_ses_estab"));
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return SIADFAIL;
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}
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int
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siad_ses_launch(sia_collect_func_t *collect,
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SIAENTITY *entity,
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int pkgind)
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{
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static char env[MaxPathLen];
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struct state *s = (struct state*)entity->mech[pkgind];
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SIA_DEBUG(("DEBUG", "siad_ses_launch"));
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if(s->valid){
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#ifdef SIA_KRB5
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chown(s->ticket + sizeof("FILE:") - 1,
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entity->pwd->pw_uid,
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entity->pwd->pw_gid);
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snprintf(env, sizeof(env), "KRB5CCNAME=%s", s->ticket);
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#endif
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#ifdef SIA_KRB4
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chown(s->ticket, entity->pwd->pw_uid, entity->pwd->pw_gid);
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snprintf(env, sizeof(env), "KRBTKFILE=%s", s->ticket);
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#endif
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putenv(env);
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}
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#ifdef KRB4
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if (k_hasafs()) {
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char cell[64];
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k_setpag();
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if(k_afs_cell_of_file(entity->pwd->pw_dir, cell, sizeof(cell)) == 0)
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krb_afslog(cell, 0);
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krb_afslog_home(0, 0, entity->pwd->pw_dir);
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}
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#endif
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return SIADSUCCESS;
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}
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int
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siad_ses_release(SIAENTITY *entity, int pkgind)
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{
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SIA_DEBUG(("DEBUG", "siad_ses_release"));
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if(entity->mech[pkgind]){
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#ifdef SIA_KRB5
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struct state *s = (struct state*)entity->mech[pkgind];
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krb5_free_context(s->context);
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#endif
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free(entity->mech[pkgind]);
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}
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return SIADSUCCESS;
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}
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int
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siad_ses_suauthent(sia_collect_func_t *collect,
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SIAENTITY *entity,
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int siastat,
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int pkgind)
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{
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SIA_DEBUG(("DEBUG", "siad_ses_suauth"));
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if(geteuid() != 0)
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return SIADFAIL;
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if(entity->name == NULL)
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return SIADFAIL;
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if(entity->name[0] == '\0') {
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free(entity->name);
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entity->name = strdup("root");
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if (entity->name == NULL)
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return SIADFAIL;
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}
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return common_auth(collect, entity, siastat, pkgind);
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}
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int
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siad_ses_reauthent (sia_collect_func_t *collect,
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SIAENTITY *entity,
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int siastat,
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int pkgind)
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{
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int ret;
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SIA_DEBUG(("DEBUG", "siad_ses_reauthent"));
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if(entity == NULL || entity->name == NULL)
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return SIADFAIL;
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ret = common_auth(collect, entity, siastat, pkgind);
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if((ret & SIADSUCCESS)){
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/* launch isn't (always?) called when doing reauth, so we must
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duplicate some code here... */
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struct state *s = (struct state*)entity->mech[pkgind];
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chown(s->ticket, entity->pwd->pw_uid, entity->pwd->pw_gid);
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#ifdef KRB4
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if(k_hasafs()) {
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char cell[64];
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if(k_afs_cell_of_file(entity->pwd->pw_dir,
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cell, sizeof(cell)) == 0)
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krb_afslog(cell, 0);
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krb_afslog_home(0, 0, entity->pwd->pw_dir);
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}
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#endif
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}
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return ret;
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}
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int
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siad_chg_finger (sia_collect_func_t *collect,
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const char *username,
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int argc,
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char *argv[])
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{
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SIA_DEBUG(("DEBUG", "siad_chg_finger"));
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return SIADFAIL;
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}
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#ifdef SIA_KRB5
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int
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siad_chg_password (sia_collect_func_t *collect,
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const char *username,
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int argc,
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char *argv[])
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{
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return SIADFAIL;
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}
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#endif
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#ifdef SIA_KRB4
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static void
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sia_message(sia_collect_func_t *collect, int rendition,
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const char *title, const char *message)
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{
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prompt_t prompt;
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prompt.prompt = (unsigned char*)message;
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(*collect)(0, rendition, (unsigned char*)title, 1, &prompt);
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}
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static int
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init_change(sia_collect_func_t *collect, krb_principal *princ)
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{
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prompt_t prompt;
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char old_pw[MAX_KPW_LEN+1];
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char *msg;
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char tktstring[128];
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int ret;
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SIA_DEBUG(("DEBUG", "init_change"));
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prompt.prompt = (unsigned char*)"Old password: ";
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prompt.result = (unsigned char*)old_pw;
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prompt.min_result_length = 0;
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prompt.max_result_length = sizeof(old_pw) - 1;
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prompt.control_flags = SIARESINVIS;
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asprintf(&msg, "Changing password for %s", krb_unparse_name(princ));
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if(msg == NULL){
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SIA_DEBUG(("DEBUG", "out of memory"));
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return SIADFAIL;
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}
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ret = (*collect)(60, SIAONELINER, (unsigned char*)msg, 1, &prompt);
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free(msg);
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SIA_DEBUG(("DEBUG", "ret = %d", ret));
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if(ret != SIACOLSUCCESS)
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return SIADFAIL;
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snprintf(tktstring, sizeof(tktstring),
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"%s_cpw_%u", TKT_ROOT, (unsigned)getpid());
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krb_set_tkt_string(tktstring);
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ret = krb_get_pw_in_tkt(princ->name, princ->instance, princ->realm,
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PWSERV_NAME, KADM_SINST, 1, old_pw);
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if (ret != KSUCCESS) {
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SIA_DEBUG(("DEBUG", "krb_get_pw_in_tkt: %s", krb_get_err_text(ret)));
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if (ret == INTK_BADPW)
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sia_message(collect, SIAWARNING, "", "Incorrect old password.");
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else
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sia_message(collect, SIAWARNING, "", "Kerberos error.");
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memset(old_pw, 0, sizeof(old_pw));
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return SIADFAIL;
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}
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if(chown(tktstring, getuid(), -1) < 0){
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dest_tkt();
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return SIADFAIL;
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}
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memset(old_pw, 0, sizeof(old_pw));
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return SIADSUCCESS;
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}
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int
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siad_chg_password (sia_collect_func_t *collect,
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const char *username,
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int argc,
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char *argv[])
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{
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prompt_t prompts[2];
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krb_principal princ;
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int ret;
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char new_pw1[MAX_KPW_LEN+1];
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char new_pw2[MAX_KPW_LEN+1];
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static struct et_list *et_list;
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setprogname(argv[0]);
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SIA_DEBUG(("DEBUG", "siad_chg_password"));
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if(collect == NULL)
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return SIADFAIL;
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if(username == NULL)
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|
username = getlogin();
|
|
|
|
ret = krb_parse_name(username, &princ);
|
|
if(ret)
|
|
return SIADFAIL;
|
|
if(princ.realm[0] == '\0')
|
|
krb_get_lrealm(princ.realm, 1);
|
|
|
|
if(et_list == NULL) {
|
|
initialize_kadm_error_table_r(&et_list);
|
|
initialize_krb_error_table_r(&et_list);
|
|
}
|
|
|
|
ret = init_change(collect, &princ);
|
|
if(ret != SIADSUCCESS)
|
|
return ret;
|
|
|
|
again:
|
|
prompts[0].prompt = (unsigned char*)"New password: ";
|
|
prompts[0].result = (unsigned char*)new_pw1;
|
|
prompts[0].min_result_length = MIN_KPW_LEN;
|
|
prompts[0].max_result_length = sizeof(new_pw1) - 1;
|
|
prompts[0].control_flags = SIARESINVIS;
|
|
prompts[1].prompt = (unsigned char*)"Verify new password: ";
|
|
prompts[1].result = (unsigned char*)new_pw2;
|
|
prompts[1].min_result_length = MIN_KPW_LEN;
|
|
prompts[1].max_result_length = sizeof(new_pw2) - 1;
|
|
prompts[1].control_flags = SIARESINVIS;
|
|
if((*collect)(120, SIAFORM, (unsigned char*)"", 2, prompts) !=
|
|
SIACOLSUCCESS) {
|
|
dest_tkt();
|
|
return SIADFAIL;
|
|
}
|
|
if(strcmp(new_pw1, new_pw2) != 0){
|
|
sia_message(collect, SIAWARNING, "", "Password mismatch.");
|
|
goto again;
|
|
}
|
|
ret = kadm_check_pw(new_pw1);
|
|
if(ret) {
|
|
sia_message(collect, SIAWARNING, "", com_right(et_list, ret));
|
|
goto again;
|
|
}
|
|
|
|
memset(new_pw2, 0, sizeof(new_pw2));
|
|
ret = kadm_init_link (PWSERV_NAME, KRB_MASTER, princ.realm);
|
|
if (ret != KADM_SUCCESS)
|
|
sia_message(collect, SIAWARNING, "Error initing kadmin connection",
|
|
com_right(et_list, ret));
|
|
else {
|
|
des_cblock newkey;
|
|
char *pw_msg; /* message from server */
|
|
|
|
des_string_to_key(new_pw1, &newkey);
|
|
ret = kadm_change_pw_plain((unsigned char*)&newkey, new_pw1, &pw_msg);
|
|
memset(newkey, 0, sizeof(newkey));
|
|
|
|
if (ret == KADM_INSECURE_PW)
|
|
sia_message(collect, SIAWARNING, "Insecure password", pw_msg);
|
|
else if (ret != KADM_SUCCESS)
|
|
sia_message(collect, SIAWARNING, "Error changing password",
|
|
com_right(et_list, ret));
|
|
}
|
|
memset(new_pw1, 0, sizeof(new_pw1));
|
|
|
|
if (ret != KADM_SUCCESS)
|
|
sia_message(collect, SIAWARNING, "", "Password NOT changed.");
|
|
else
|
|
sia_message(collect, SIAINFO, "", "Password changed.");
|
|
|
|
dest_tkt();
|
|
if(ret)
|
|
return SIADFAIL;
|
|
return SIADSUCCESS;
|
|
}
|
|
#endif
|
|
|
|
int
|
|
siad_chg_shell (sia_collect_func_t *collect,
|
|
const char *username,
|
|
int argc,
|
|
char *argv[])
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getpwent(struct passwd *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getpwuid (uid_t uid,
|
|
struct passwd *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getpwnam (const char *name,
|
|
struct passwd *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_setpwent (struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_endpwent (struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getgrent(struct group *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getgrgid (gid_t gid,
|
|
struct group *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_getgrnam (const char *name,
|
|
struct group *result,
|
|
char *buf,
|
|
int bufsize,
|
|
struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_setgrent (struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_endgrent (struct sia_context *context)
|
|
{
|
|
return SIADFAIL;
|
|
}
|
|
|
|
int
|
|
siad_chk_user (const char *logname, int checkflag)
|
|
{
|
|
if(checkflag != CHGPASSWD)
|
|
return SIADFAIL;
|
|
return SIADSUCCESS;
|
|
}
|