4fb6bc364f
that it handles the ERANGE error return case. Without this fix, authentication of users for certain system setups could fail unexpectedly. Reported by: Elias Martenson (lokedhs@gmail.com) Tested by: Elias Martenson (earlier version) MFC after: 2 weeks
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*-
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* Copyright (c) 2008 Isilon Inc http://www.isilon.com/
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* Authors: Doug Rabson <dfr@rabson.org>
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* Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
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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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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/* $FreeBSD$ */
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#include <errno.h>
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#include <pwd.h>
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#include "krb5/gsskrb5_locl.h"
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OM_uint32
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_gsskrb5_pname_to_uid(OM_uint32 *minor_status, const gss_name_t pname,
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const gss_OID mech, uid_t *uidp)
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{
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krb5_context context;
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krb5_const_principal name = (krb5_const_principal) pname;
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krb5_error_code kret;
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char lname[MAXLOGNAME + 1], buf[1024], *bufp;
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struct passwd pwd, *pw;
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size_t buflen;
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int error;
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OM_uint32 ret;
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static size_t buflen_hint = 1024;
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GSSAPI_KRB5_INIT (&context);
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kret = krb5_aname_to_localname(context, name, sizeof(lname), lname);
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if (kret) {
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*minor_status = kret;
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return (GSS_S_FAILURE);
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}
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*minor_status = 0;
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buflen = buflen_hint;
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for (;;) {
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pw = NULL;
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bufp = buf;
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if (buflen > sizeof(buf))
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bufp = malloc(buflen);
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if (bufp == NULL)
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break;
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error = getpwnam_r(lname, &pwd, bufp, buflen, &pw);
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if (error != ERANGE)
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break;
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if (buflen > sizeof(buf))
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free(bufp);
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buflen += 1024;
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if (buflen > buflen_hint)
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buflen_hint = buflen;
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}
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if (pw) {
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*uidp = pw->pw_uid;
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ret = GSS_S_COMPLETE;
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} else {
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ret = GSS_S_FAILURE;
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}
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if (bufp != NULL && buflen > sizeof(buf))
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free(bufp);
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return (ret);
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}
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