/*
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* Check decoding of SO_PEERCRED socket option.
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*
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* Copyright (c) 2017 Dmitry V. Levin <ldv@altlinux.org>
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* Copyright (c) 2017-2018 The strace developers.
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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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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "tests.h"
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include "print_fields.h"
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static const char *errstr;
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static int
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get_peercred(int fd, void *val, socklen_t *len)
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{
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int rc = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, val, len);
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errstr = sprintrc(rc);
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return rc;
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}
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static const char *
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so_str(void)
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{
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static char buf[256];
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if (!buf[0]) {
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#if XLAT_RAW
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snprintf(buf, sizeof(buf),
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"%#x, %#x", SOL_SOCKET, SO_PEERCRED);
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#elif XLAT_VERBOSE
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snprintf(buf, sizeof(buf),
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"%#x /* SOL_SOCKET */, %#x /* SO_PEERCRED */",
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SOL_SOCKET, SO_PEERCRED);
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#else
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snprintf(buf, sizeof(buf),
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"SOL_SOCKET, SO_PEERCRED");
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#endif
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}
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return buf;
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}
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int
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main(void)
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{
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TAIL_ALLOC_OBJECT_CONST_PTR(struct ucred, peercred);
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TAIL_ALLOC_OBJECT_CONST_PTR(socklen_t, len);
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const unsigned int sizeof_pid = sizeof(peercred->pid);
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struct ucred *const pid = tail_alloc(sizeof_pid);
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const unsigned int sizeof_pid_truncated = sizeof_pid - 1;
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struct ucred *const pid_truncated =
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tail_alloc(sizeof_pid_truncated);
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const unsigned int sizeof_uid = offsetofend(struct ucred, uid);
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struct ucred *const uid = tail_alloc(sizeof_uid);
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const unsigned int sizeof_uid_truncated = sizeof_uid - 1;
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struct ucred *const uid_truncated =
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tail_alloc(sizeof_uid_truncated);
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const unsigned int sizeof_gid_truncated =
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offsetofend(struct ucred, gid) - 1;
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struct ucred *const gid_truncated =
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tail_alloc(sizeof_gid_truncated);
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int sv[2];
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if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
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perror_msg_and_skip("socketpair AF_UNIX SOCK_STREAM");
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/* classic getsockopt */
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*len = sizeof(*peercred);
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get_peercred(sv[0], peercred, len);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *peercred, pid);
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PRINT_FIELD_UID(", ", *peercred, uid);
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PRINT_FIELD_UID(", ", *peercred, gid);
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printf("}, [%d]) = %s\n", *len, errstr);
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/* getsockopt with zero optlen */
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*len = 0;
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get_peercred(sv[0], peercred, len);
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printf("getsockopt(%d, %s, %p, [0]) = %s\n",
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sv[0], so_str(), peercred, errstr);
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/* getsockopt with optlen larger than necessary - shortened */
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*len = sizeof(*peercred) + 1;
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get_peercred(sv[0], peercred, len);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *peercred, pid);
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PRINT_FIELD_UID(", ", *peercred, uid);
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PRINT_FIELD_UID(", ", *peercred, gid);
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printf("}, [%u->%d]) = %s\n",
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(unsigned int) sizeof(*peercred) + 1, *len, errstr);
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/*
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* getsockopt with optlen less than offsetofend(struct ucred, pid):
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* the part of struct ucred.pid is printed in hex.
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*/
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*len = sizeof_pid_truncated;
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get_peercred(sv[0], pid_truncated, len);
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printf("getsockopt(%d, %s, {pid=", sv[0], so_str());
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print_quoted_hex(pid_truncated, *len);
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printf("}, [%d]) = %s\n", *len, errstr);
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/*
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* getsockopt with optlen equals to sizeof(struct ucred.pid):
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* struct ucred.uid and struct ucred.gid are not printed.
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*/
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*len = sizeof_pid;
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get_peercred(sv[0], pid, len);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *pid, pid);
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printf("}, [%d]) = %s\n", *len, errstr);
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/*
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* getsockopt with optlen greater than sizeof(struct ucred.pid)
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* but smaller than offsetofend(struct ucred, uid):
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* the part of struct ucred.uid is printed in hex.
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*/
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*len = sizeof_uid_truncated;
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get_peercred(sv[0], uid_truncated, len);
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/*
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* Copy to a properly aligned structure to avoid unaligned access
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* to struct ucred.pid field.
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*/
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memcpy(uid, uid_truncated, sizeof_uid_truncated);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *uid, pid);
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printf(", uid=");
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print_quoted_hex(&uid->uid, sizeof_uid_truncated -
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offsetof(struct ucred, uid));
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printf("}, [%d]) = %s\n", *len, errstr);
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/*
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* getsockopt with optlen equals to offsetofend(struct ucred, uid):
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* struct ucred.gid is not printed.
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*/
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*len = sizeof_uid;
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get_peercred(sv[0], uid, len);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *uid, pid);
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PRINT_FIELD_UID(", ", *uid, uid);
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printf("}, [%d]) = %s\n", *len, errstr);
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/*
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* getsockopt with optlen greater than sizeof(struct ucred.uid)
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* but smaller than offsetofend(struct ucred, gid):
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* the part of struct ucred.gid is printed in hex.
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*/
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*len = sizeof_gid_truncated;
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get_peercred(sv[0], gid_truncated, len);
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/*
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* Copy to a properly aligned structure to avoid unaligned access
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* to struct ucred.pid and struct ucred.uid fields.
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*/
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memcpy(peercred, gid_truncated, sizeof_gid_truncated);
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printf("getsockopt(%d, %s", sv[0], so_str());
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PRINT_FIELD_D(", {", *peercred, pid);
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PRINT_FIELD_UID(", ", *peercred, uid);
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printf(", gid=");
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print_quoted_hex(&peercred->gid, sizeof_gid_truncated -
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offsetof(struct ucred, gid));
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printf("}, [%d]) = %s\n", *len, errstr);
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/* getsockopt optval EFAULT */
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*len = sizeof(*peercred);
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get_peercred(sv[0], &peercred->uid, len);
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printf("getsockopt(%d, %s, %p, [%d]) = %s\n",
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sv[0], so_str(), &peercred->uid, *len, errstr);
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/* getsockopt optlen EFAULT */
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get_peercred(sv[0], peercred, len + 1);
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printf("getsockopt(%d, %s, %p, %p) = %s\n",
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sv[0], so_str(), peercred, len + 1, errstr);
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puts("+++ exited with 0 +++");
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return 0;
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}
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