1 /*- 2 * Copyright (c) 2005 Andrey Simonenko 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 #include <sys/types.h> 29 #include <sys/socket.h> 30 #include <sys/ucred.h> 31 #include <sys/un.h> 32 #include <stdarg.h> 33 #include <stdbool.h> 34 35 #include "uc_common.h" 36 #include "t_generic.h" 37 #include "t_peercred.h" 38 39 static int 40 check_xucred(const struct xucred *xucred, socklen_t len) 41 { 42 int rc; 43 44 if (len != sizeof(*xucred)) { 45 uc_logmsgx("option value size %zu != %zu", 46 (size_t)len, sizeof(*xucred)); 47 return (-1); 48 } 49 50 uc_dbgmsg("xucred.cr_version %u", xucred->cr_version); 51 uc_dbgmsg("xucred.cr_uid %lu", (u_long)xucred->cr_uid); 52 uc_dbgmsg("xucred.cr_ngroups %d", xucred->cr_ngroups); 53 54 rc = 0; 55 56 if (xucred->cr_version != XUCRED_VERSION) { 57 uc_logmsgx("xucred.cr_version %u != %d", 58 xucred->cr_version, XUCRED_VERSION); 59 rc = -1; 60 } 61 if (xucred->cr_uid != uc_cfg.proc_cred.euid) { 62 uc_logmsgx("xucred.cr_uid %lu != %lu (EUID)", 63 (u_long)xucred->cr_uid, (u_long)uc_cfg.proc_cred.euid); 64 rc = -1; 65 } 66 if (xucred->cr_ngroups == 0) { 67 uc_logmsgx("xucred.cr_ngroups == 0"); 68 rc = -1; 69 } 70 if (xucred->cr_ngroups < 0) { 71 uc_logmsgx("xucred.cr_ngroups < 0"); 72 rc = -1; 73 } 74 if (xucred->cr_ngroups > XU_NGROUPS) { 75 uc_logmsgx("xucred.cr_ngroups %hu > %u (max)", 76 xucred->cr_ngroups, XU_NGROUPS); 77 rc = -1; 78 } 79 if (xucred->cr_groups[0] != uc_cfg.proc_cred.egid) { 80 uc_logmsgx("xucred.cr_groups[0] %lu != %lu (EGID)", 81 (u_long)xucred->cr_groups[0], (u_long)uc_cfg.proc_cred.egid); 82 rc = -1; 83 } 84 if (uc_check_groups("xucred.cr_groups", xucred->cr_groups, 85 "xucred.cr_ngroups", xucred->cr_ngroups, false) < 0) 86 rc = -1; 87 return (rc); 88 } 89 90 static int 91 t_peercred_client(int fd) 92 { 93 struct xucred xucred; 94 socklen_t len; 95 96 if (uc_sync_recv() < 0) 97 return (-1); 98 99 if (uc_socket_connect(fd) < 0) 100 return (-1); 101 102 len = sizeof(xucred); 103 if (getsockopt(fd, 0, LOCAL_PEERCRED, &xucred, &len) < 0) { 104 uc_logmsg("getsockopt(LOCAL_PEERCRED)"); 105 return (-1); 106 } 107 108 if (check_xucred(&xucred, len) < 0) 109 return (-1); 110 111 return (0); 112 } 113 114 static int 115 t_peercred_server(int fd1) 116 { 117 struct xucred xucred; 118 socklen_t len; 119 int fd2, rv; 120 121 if (uc_sync_send() < 0) 122 return (-2); 123 124 fd2 = uc_socket_accept(fd1); 125 if (fd2 < 0) 126 return (-2); 127 128 len = sizeof(xucred); 129 if (getsockopt(fd2, 0, LOCAL_PEERCRED, &xucred, &len) < 0) { 130 uc_logmsg("getsockopt(LOCAL_PEERCRED)"); 131 rv = -2; 132 goto done; 133 } 134 135 if (check_xucred(&xucred, len) < 0) { 136 rv = -1; 137 goto done; 138 } 139 140 rv = 0; 141 done: 142 if (uc_socket_close(fd2) < 0) 143 rv = -2; 144 return (rv); 145 } 146 147 int 148 t_peercred(void) 149 { 150 return (t_generic(t_peercred_client, t_peercred_server)); 151 } 152