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annotate src/privsep-linux.c @ 5540:a6ee95eb8e60 draft

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privsep: Allow fcntl64 and fstat64 to fix ARM32 talking to the controller We already allow fcntl and fstat so this is not a problem.
author Matthew Clarkson <mclarkson@reliablecontrols.com>
date Fri, 13 Nov 2020 08:22:42 +0000
parents a5c61a48ae3c
children f233c9381c56
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rev   line source
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1 /* SPDX-License-Identifier: BSD-2-Clause */
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2 /*
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3 * Privilege Separation for dhcpcd, Linux driver
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555d7d1a4939 Welcome to 2020!
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4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
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5 * All rights reserved
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6
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #include <sys/ioctl.h>
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30 #include <sys/prctl.h>
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31 #include <sys/syscall.h>
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32
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33 #include <linux/audit.h>
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34 #include <linux/filter.h>
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35 #include <linux/seccomp.h>
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36 #include <linux/sockios.h>
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37
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38 #include <errno.h>
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39 #include <fcntl.h>
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40 #include <stddef.h>
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41 #include <stdio.h>
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42 #include <stdlib.h>
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43 #include <string.h>
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44 #include <unistd.h>
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45
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46 #include "common.h"
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47 #include "if.h"
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48 #include "logerr.h"
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49 #include "privsep.h"
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50
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51 /*
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52 * Set this to debug SECCOMP.
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53 * Then run dhcpcd with strace -f and strace will even translate
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54 * the failing syscall into the __NR_name define we need to use below.
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55 * DO NOT ENABLE THIS FOR PRODUCTION BUILDS!
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56 */
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57 //#define SECCOMP_FILTER_DEBUG
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58
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59 static ssize_t
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60 ps_root_dosendnetlink(int protocol, struct msghdr *msg)
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61 {
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62 struct sockaddr_nl snl = { .nl_family = AF_NETLINK };
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63 int s;
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64 unsigned char buf[16 * 1024];
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65 struct iovec riov = {
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66 .iov_base = buf,
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67 .iov_len = sizeof(buf),
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68 };
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69 ssize_t retval;
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70
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71 if ((s = if_linksocket(&snl, protocol, 0)) == -1)
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72 return -1;
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73
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74 if (sendmsg(s, msg, 0) == -1) {
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75 retval = -1;
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76 goto out;
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77 }
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78
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79 retval = if_getnetlink(NULL, &riov, s, 0, NULL, NULL);
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80 out:
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81 close(s);
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82 return retval;
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83 }
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84
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85 ssize_t
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86 ps_root_os(struct ps_msghdr *psm, struct msghdr *msg,
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87 __unused void **rdata, __unused size_t *rlen)
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88 {
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89
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90 switch (psm->ps_cmd) {
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91 case PS_ROUTE:
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92 return ps_root_dosendnetlink((int)psm->ps_flags, msg);
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93 default:
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94 errno = ENOTSUP;
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95 return -1;
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96 }
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97 }
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98
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99 ssize_t
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100 ps_root_sendnetlink(struct dhcpcd_ctx *ctx, int protocol, struct msghdr *msg)
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101 {
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102
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103 if (ps_sendmsg(ctx, ctx->ps_root_fd, PS_ROUTE,
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104 (unsigned long)protocol, msg) == -1)
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105 return -1;
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106 return ps_root_readerror(ctx, NULL, 0);
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107 }
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108
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109 #if (BYTE_ORDER == LITTLE_ENDIAN)
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110 # define SECCOMP_ARG_LO 0
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111 # define SECCOMP_ARG_HI sizeof(uint32_t)
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112 #elif (BYTE_ORDER == BIG_ENDIAN)
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113 # define SECCOMP_ARG_LO sizeof(uint32_t)
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114 # define SECCOMP_ARG_HI 0
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115 #else
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116 # error "Uknown endian"
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117 #endif
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118
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119 #define SECCOMP_ALLOW(_nr) \
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120 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (_nr), 0, 1), \
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121 BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW)
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122
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123 #define SECCOMP_ALLOW_ARG(_nr, _arg, _val) \
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124 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (_nr), 0, 6), \
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125 BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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126 offsetof(struct seccomp_data, args[(_arg)]) + SECCOMP_ARG_LO), \
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127 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
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128 ((_val) & 0xffffffff), 0, 3), \
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129 BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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130 offsetof(struct seccomp_data, args[(_arg)]) + SECCOMP_ARG_HI), \
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131 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
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132 (((uint32_t)((uint64_t)(_val) >> 32)) & 0xffffffff), 0, 1), \
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133 BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW), \
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134 BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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135 offsetof(struct seccomp_data, nr))
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136
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137 #ifdef SECCOMP_FILTER_DEBUG
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138 #define SECCOMP_FILTER_FAIL SECCOMP_RET_TRAP
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139 #else
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140 #define SECCOMP_FILTER_FAIL SECCOMP_RET_KILL
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141 #endif
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142
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143 /* I personally find this quite nutty.
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144 * Why can a system header not define a default for this? */
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145 #if defined(__i386__)
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146 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386
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147 #elif defined(__x86_64__)
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148 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64
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149 #elif defined(__arm__)
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150 # ifndef EM_ARM
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151 # define EM_ARM 40
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152 # endif
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153 # if (BYTE_ORDER == LITTLE_ENDIAN)
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154 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARM
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155 # else
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156 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARMEB
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157 # endif
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158 #elif defined(__aarch64__)
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159 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_AARCH64
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160 #elif defined(__alpha__)
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161 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ALPHA
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162 #elif defined(__hppa__)
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163 # if defined(__LP64__)
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164 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC64
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165 # else
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166 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC
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167 # endif
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168 #elif defined(__ia64__)
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169 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_IA64
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170 #elif defined(__mips__)
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171 # if defined(__MIPSEL__)
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172 # if defined(__LP64__)
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173 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL64
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174 # else
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175 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL
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176 # endif
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177 # elif defined(__LP64__)
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178 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS64
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179 # else
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180 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS
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181 # endif
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182 #elif defined(__powerpc64__)
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183 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64
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184 #elif defined(__powerpc__)
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185 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC
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186 #elif defined(__riscv)
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187 # if defined(__LP64__)
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188 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV64
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189 # else
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190 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV32
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191 # endif
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192 #elif defined(__s390x__)
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193 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390X
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194 #elif defined(__s390__)
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195 # define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390
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196 #elif defined(__sparc__)
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197 # if defined(__arch64__)
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198 # define AUDIT_ARCH_SPARC64
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199 # else
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200 # define AUDIT_ARCH_SPARC
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201 # endif
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202 #else
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203 # error "Platform does not support seccomp filter yet"
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204 #endif
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205
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206 static struct sock_filter ps_seccomp_filter[] = {
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207 /* Check syscall arch */
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208 BPF_STMT(BPF_LD + BPF_W + BPF_ABS,
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209 offsetof(struct seccomp_data, arch)),
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210 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, SECCOMP_AUDIT_ARCH, 1, 0),
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211 BPF_STMT(BPF_RET + BPF_K, SECCOMP_FILTER_FAIL),
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212 /* Allow syscalls */
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213 BPF_STMT(BPF_LD + BPF_W + BPF_ABS,
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214 offsetof(struct seccomp_data, nr)),
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215 #ifdef __NR_accept
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216 SECCOMP_ALLOW(__NR_accept),
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217 #endif
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218 #ifdef __NR_brk
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219 SECCOMP_ALLOW(__NR_brk),
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220 #endif
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221 #ifdef __NR_clock_gettime
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222 SECCOMP_ALLOW(__NR_clock_gettime),
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223 #endif
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224 #if defined(__x86_64__) && defined(__ILP32__) && defined(__X32_SYSCALL_BIT)
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225 SECCOMP_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT),
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226 #endif
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227 #ifdef __NR_clock_gettime64
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228 SECCOMP_ALLOW(__NR_clock_gettime64),
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229 #endif
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230 #ifdef __NR_close
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231 SECCOMP_ALLOW(__NR_close),
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232 #endif
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233 #ifdef __NR_exit_group
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234 SECCOMP_ALLOW(__NR_exit_group),
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235 #endif
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236 #ifdef __NR_fcntl
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237 SECCOMP_ALLOW(__NR_fcntl),
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238 #endif
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239 #ifdef __NR_fcntl64
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240 SECCOMP_ALLOW(__NR_fcntl64),
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241 #endif
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242 #ifdef __NR_fstat
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243 SECCOMP_ALLOW(__NR_fstat),
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244 #endif
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245 #ifdef __NR_fstat64
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246 SECCOMP_ALLOW(__NR_fstat64),
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247 #endif
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248 #ifdef __NR_gettimeofday
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249 SECCOMP_ALLOW(__NR_gettimeofday),
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250 #endif
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251 #ifdef __NR_getpid
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252 SECCOMP_ALLOW(__NR_getpid),
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253 #endif
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diff changeset
254 #ifdef __NR_ioctl
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255 SECCOMP_ALLOW_ARG(__NR_ioctl, 1, SIOCGIFFLAGS),
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diff changeset
256 SECCOMP_ALLOW_ARG(__NR_ioctl, 1, SIOCGIFHWADDR),
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diff changeset
257 SECCOMP_ALLOW_ARG(__NR_ioctl, 1, SIOCGIFINDEX),
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diff changeset
258 SECCOMP_ALLOW_ARG(__NR_ioctl, 1, SIOCGIFMTU),
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diff changeset
259 SECCOMP_ALLOW_ARG(__NR_ioctl, 1, SIOCGIFVLAN),
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diff changeset
260 /* SECCOMP BPF is newer than nl80211 so we don't need SIOCGIWESSID
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diff changeset
261 * which lives in the impossible to include linux/wireless.h header */
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diff changeset
262 #endif
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diff changeset
263 #ifdef __NR_mmap
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264 SECCOMP_ALLOW(__NR_mmap),
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diff changeset
265 #endif
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266 #ifdef __NR_munmap
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267 SECCOMP_ALLOW(__NR_munmap),
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diff changeset
268 #endif
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diff changeset
269 #ifdef __NR_nanosleep
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diff changeset
270 SECCOMP_ALLOW(__NR_nanosleep), /* XXX should use ppoll instead */
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271 #endif
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272 #ifdef __NR_ppoll
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273 SECCOMP_ALLOW(__NR_ppoll),
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Roy Marples <roy@marples.name>
parents: 5303
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274 #endif
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275 #ifdef __NR_ppoll_time64
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276 SECCOMP_ALLOW(__NR_ppoll_time64),
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277 #endif
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278 #ifdef __NR_read
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279 SECCOMP_ALLOW(__NR_read),
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280 #endif
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281 #ifdef __NR_readv
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282 SECCOMP_ALLOW(__NR_readv),
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283 #endif
5519
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284 #ifdef __NR_recv
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285 SECCOMP_ALLOW(__NR_recv),
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286 #endif
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287 #ifdef __NR_recvfrom
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288 SECCOMP_ALLOW(__NR_recvfrom),
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Roy Marples <roy@marples.name>
parents: 5303
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289 #endif
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290 #ifdef __NR_recvmsg
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291 SECCOMP_ALLOW(__NR_recvmsg),
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parents: 5303
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292 #endif
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293 #ifdef __NR_rt_sigreturn
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294 SECCOMP_ALLOW(__NR_rt_sigreturn),
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295 #endif
5519
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diff changeset
296 #ifdef __NR_send
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297 SECCOMP_ALLOW(__NR_send),
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298 #endif
5461
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299 #ifdef __NR_sendmsg
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300 SECCOMP_ALLOW(__NR_sendmsg),
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Roy Marples <roy@marples.name>
parents: 5303
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301 #endif
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diff changeset
302 #ifdef __NR_sendto
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303 SECCOMP_ALLOW(__NR_sendto),
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Roy Marples <roy@marples.name>
parents: 5303
diff changeset
304 #endif
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305 #ifdef __NR_shutdown
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306 SECCOMP_ALLOW(__NR_shutdown),
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Roy Marples <roy@marples.name>
parents: 5303
diff changeset
307 #endif
5519
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diff changeset
308 #ifdef __NR_time
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parents: 5512
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309 SECCOMP_ALLOW(__NR_time),
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310 #endif
5468
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311 #ifdef __NR_wait4
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312 SECCOMP_ALLOW(__NR_wait4),
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313 #endif
5519
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314 #ifdef __NR_waitpid
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315 SECCOMP_ALLOW(__NR_waitpid),
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316 #endif
5461
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diff changeset
317 #ifdef __NR_write
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318 SECCOMP_ALLOW(__NR_write),
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parents: 5303
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319 #endif
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320 #ifdef __NR_writev
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321 SECCOMP_ALLOW(__NR_writev),
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322 #endif
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diff changeset
323 #ifdef __NR_uname
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324 SECCOMP_ALLOW(__NR_uname),
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parents: 5303
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325 #endif
5464
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326
5461
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diff changeset
327 /* Deny everything else */
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diff changeset
328 BPF_STMT(BPF_RET + BPF_K, SECCOMP_FILTER_FAIL),
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diff changeset
329 };
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diff changeset
330
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diff changeset
331 static struct sock_fprog ps_seccomp_prog = {
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diff changeset
332 .len = (unsigned short)__arraycount(ps_seccomp_filter),
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333 .filter = ps_seccomp_filter,
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334 };
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335
5519
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diff changeset
336 #ifdef SECCOMP_FILTER_DEBUG
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337 static void
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338 ps_seccomp_violation(__unused int signum, siginfo_t *si, __unused void *context)
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339 {
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340
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341 logerrx("%s: unexpected syscall %d (arch=0x%x)",
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diff changeset
342 __func__, si->si_syscall, si->si_arch);
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343 _exit(EXIT_FAILURE);
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diff changeset
344 }
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345
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diff changeset
346 static int
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diff changeset
347 ps_seccomp_debug(void)
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diff changeset
348 {
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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diff changeset
349 struct sigaction sa = {
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diff changeset
350 .sa_flags = SA_SIGINFO,
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diff changeset
351 .sa_sigaction = &ps_seccomp_violation,
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diff changeset
352 };
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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parents: 5512
diff changeset
353 sigset_t mask;
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diff changeset
354
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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parents: 5512
diff changeset
355 /* Install a signal handler to catch any issues with our filter. */
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diff changeset
356 sigemptyset(&mask);
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diff changeset
357 sigaddset(&mask, SIGSYS);
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parents: 5512
diff changeset
358 if (sigaction(SIGSYS, &sa, NULL) == -1 ||
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parents: 5512
diff changeset
359 sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1)
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diff changeset
360 return -1;
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parents: 5512
diff changeset
361
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diff changeset
362 return 0;
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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parents: 5512
diff changeset
363 }
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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parents: 5512
diff changeset
364 #endif
a5c61a48ae3c privsep: Allow more syscalls through SECCOMP and add a debugger
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parents: 5512
diff changeset
365
5461
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diff changeset
366 int
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diff changeset
367 ps_seccomp_enter(void)
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parents: 5303
diff changeset
368 {
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parents: 5303
diff changeset
369
5519
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diff changeset
370 #ifdef SECCOMP_FILTER_DEBUG
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diff changeset
371 ps_seccomp_debug();
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parents: 5512
diff changeset
372 #endif
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parents: 5512
diff changeset
373
5462
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parents: 5461
diff changeset
374 if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1 ||
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diff changeset
375 prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &ps_seccomp_prog) == -1)
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parents: 5461
diff changeset
376 {
6e80b8c6f70c privsep: Log if the platform sandbox is unavailable or available
Roy Marples <roy@marples.name>
parents: 5461
diff changeset
377 if (errno == EINVAL)
6e80b8c6f70c privsep: Log if the platform sandbox is unavailable or available
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parents: 5461
diff changeset
378 errno = ENOSYS;
6e80b8c6f70c privsep: Log if the platform sandbox is unavailable or available
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parents: 5461
diff changeset
379 return -1;
6e80b8c6f70c privsep: Log if the platform sandbox is unavailable or available
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parents: 5461
diff changeset
380 }
5461
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diff changeset
381 return 0;
30f55aaa5fd6 privsep: Add the SECCOMP BPF sandbox for Linux
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parents: 5303
diff changeset
382 }