mirror of https://github.com/omar-polo/gmid.git
649 lines
14 KiB
C
649 lines
14 KiB
C
/*
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* Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "gmid.h"
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#if DISABLE_SANDBOX
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#warning "Sandbox disabled! Please report issues upstream instead of disabling the sandbox."
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void
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sandbox_server_process(int can_open_sockets)
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{
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return;
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}
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void
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sandbox_logger_process(void)
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{
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return;
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}
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#elif defined(__FreeBSD__)
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#include <sys/capsicum.h>
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void
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sandbox_server_process(int can_open_sockets)
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{
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/* can't capsicum if fastcgi or proxying are used. */
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if (can_open_sockets)
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return;
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if (cap_enter() == -1)
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fatal("cap_enter");
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}
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void
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sandbox_logger_process(void)
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{
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if (cap_enter() == -1)
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fatal("cap_enter");
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}
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#elif defined(__linux__)
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#include <sys/ioctl.h>
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#include <sys/prctl.h>
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#include <sys/syscall.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <linux/audit.h>
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#include <linux/filter.h>
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#include <linux/seccomp.h>
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#include <errno.h>
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#include <fcntl.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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#if HAVE_LANDLOCK
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# include "landlock_shim.h"
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#endif
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/* uncomment to enable debugging. ONLY FOR DEVELOPMENT */
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/* #define SC_DEBUG */
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#ifdef SC_DEBUG
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# define SC_FAIL SECCOMP_RET_TRAP
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#else
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# define SC_FAIL SECCOMP_RET_KILL
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#endif
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#if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SC_ARG_LO 0
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# define SC_ARG_HI sizeof(uint32_t)
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#elif (BYTE_ORDER == BIG_ENDIAN)
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# define SC_ARG_LO sizeof(uint32_t)
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# define SC_ARG_HI 0
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#else
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# error "Uknown endian"
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#endif
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/* make the filter more readable */
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#define SC_ALLOW(nr) \
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BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, __NR_##nr, 0, 1), \
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BPF_STMT(BPF_RET | BPF_K, SECCOMP_RET_ALLOW)
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/*
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* SC_ALLOW_ARG and the SECCOMP_AUDIT_ARCH below are courtesy of
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* https://roy.marples.name/git/dhcpcd/blob/HEAD:/src/privsep-linux.c
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*/
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#define SC_ALLOW_ARG(_nr, _arg, _val) \
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, (_nr), 0, 6), \
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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offsetof(struct seccomp_data, args[(_arg)]) + SC_ARG_LO), \
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
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((_val) & 0xffffffff), 0, 3), \
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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offsetof(struct seccomp_data, args[(_arg)]) + SC_ARG_HI), \
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BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, \
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(((uint32_t)((uint64_t)(_val) >> 32)) & 0xffffffff), 0, 1), \
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BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW), \
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BPF_STMT(BPF_LD + BPF_W + BPF_ABS, \
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offsetof(struct seccomp_data, nr))
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/*
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* I personally find this quite nutty. Why can a system header not
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* define a default for this?
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*/
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#if defined(__i386__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_I386
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#elif defined(__x86_64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_X86_64
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#elif defined(__arc__)
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# if defined(__A7__)
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACT
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCOMPACTBE
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# endif
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# elif defined(__HS__)
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARCV2BE
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# endif
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# else
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# error "Platform does not support seccomp filter yet"
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# endif
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#elif defined(__arm__)
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# ifndef EM_ARM
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# define EM_ARM 40
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# endif
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARM
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ARMEB
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# endif
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#elif defined(__aarch64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_AARCH64
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#elif defined(__alpha__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_ALPHA
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#elif defined(__hppa__)
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# if defined(__LP64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PARISC
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# endif
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#elif defined(__ia64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_IA64
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#elif defined(__microblaze__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MICROBLAZE
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#elif defined(__m68k__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_M68K
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#elif defined(__mips__)
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# if defined(__MIPSEL__)
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# if defined(__LP64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPSEL
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# endif
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# elif defined(__LP64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_MIPS
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# endif
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#elif defined(__nds32__)
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NDS32
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#else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NDS32BE
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#endif
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#elif defined(__nios2__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_NIOS2
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#elif defined(__or1k__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_OPENRISC
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#elif defined(__powerpc64__)
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64LE
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC64
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# endif
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#elif defined(__powerpc__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_PPC
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#elif defined(__riscv)
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# if defined(__LP64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_RISCV32
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# endif
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#elif defined(__s390x__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390X
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#elif defined(__s390__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_S390
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#elif defined(__sh__)
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# if defined(__LP64__)
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SHEL64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SH64
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# endif
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# else
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# if (BYTE_ORDER == LITTLE_ENDIAN)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SHEL
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SH
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# endif
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# endif
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#elif defined(__sparc__)
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# if defined(__arch64__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SPARC64
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# else
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_SPARC
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# endif
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#elif defined(__xtensa__)
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# define SECCOMP_AUDIT_ARCH AUDIT_ARCH_XTENSA
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#else
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# error "Platform does not support seccomp filter yet"
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#endif
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static const struct sock_filter filter[] = {
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/* load the *current* architecture */
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BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
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(offsetof(struct seccomp_data, arch))),
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/* ensure it's the same that we've been compiled on */
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BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K,
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SECCOMP_AUDIT_ARCH, 1, 0),
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/* if not, kill the program */
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BPF_STMT(BPF_RET | BPF_K, SC_FAIL),
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/* load the syscall number */
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BPF_STMT(BPF_LD | BPF_W | BPF_ABS,
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(offsetof(struct seccomp_data, nr))),
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#ifdef __NR_accept
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SC_ALLOW(accept),
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#endif
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#ifdef __NR_accept4
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SC_ALLOW(accept4),
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#endif
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#ifdef __NR_brk
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SC_ALLOW(brk),
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#endif
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#ifdef __NR_clock_gettime
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SC_ALLOW(clock_gettime),
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#endif
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#if defined(__x86_64__) && defined(__ILP32__) && defined(__X32_SYSCALL_BIT)
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SECCOMP_ALLOW(__NR_clock_gettime & ~__X32_SYSCALL_BIT),
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#endif
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#ifdef __NR_clock_gettime64
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SC_ALLOW(clock_gettime64),
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#endif
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#ifdef __NR_close
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SC_ALLOW(close),
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#endif
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#ifdef __NR_epoll_ctl
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SC_ALLOW(epoll_ctl),
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#endif
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#ifdef __NR_epoll_pwait
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SC_ALLOW(epoll_pwait),
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#endif
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#ifdef __NR_epoll_wait
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SC_ALLOW(epoll_wait),
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#endif
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#ifdef __NR_exit
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SC_ALLOW(exit),
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#endif
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#ifdef __NR_exit_group
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SC_ALLOW(exit_group),
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#endif
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#ifdef __NR_fcntl
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SC_ALLOW(fcntl),
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#endif
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#ifdef __NR_fcntl64
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SC_ALLOW(fcntl64),
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#endif
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#ifdef __NR_fstat
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SC_ALLOW(fstat),
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#endif
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#ifdef __NR_fstat64
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SC_ALLOW(fstat64),
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#endif
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#ifdef __NR_fstatat64
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SC_ALLOW(fstatat64),
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#endif
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#ifdef __NR_getdents64
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SC_ALLOW(getdents64),
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#endif
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#ifdef __NR_getpid
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SC_ALLOW(getpid),
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#endif
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#ifdef __NR_getrandom
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SC_ALLOW(getrandom),
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#endif
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#ifdef __NR_gettimeofday
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SC_ALLOW(gettimeofday),
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#endif
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#ifdef __NR_ioctl
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/* allow ioctl on fd 1, glibc doing stuff? */
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SC_ALLOW_ARG(__NR_ioctl, 0, 1),
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/* allow FIONREAD needed by libevent */
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SC_ALLOW_ARG(__NR_ioctl, 1, FIONREAD),
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#endif
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#ifdef __NR__llseek
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SC_ALLOW(_llseek),
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#endif
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#ifdef __NR_lseek
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SC_ALLOW(lseek),
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#endif
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#ifdef __NR_madvise
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SC_ALLOW(madvise),
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#endif
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#ifdef __NR_mmap
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SC_ALLOW(mmap),
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#endif
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#ifdef __NR_mmap2
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SC_ALLOW(mmap2),
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#endif
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#ifdef __NR_munmap
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SC_ALLOW(munmap),
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#endif
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#ifdef __NR_newfstatat
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SC_ALLOW(newfstatat),
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#endif
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#ifdef __NR_oldfstat
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SC_ALLOW(oldfstat),
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#endif
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#ifdef __NR_openat
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SC_ALLOW_ARG(__NR_openat, 3, O_RDONLY),
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#endif
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#ifdef __NR_prlimit64
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SC_ALLOW(prlimit64),
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#endif
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#ifdef __NR_read
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SC_ALLOW(read),
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#endif
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#ifdef __NR_recvmsg
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SC_ALLOW(recvmsg),
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#endif
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#ifdef __NR_readv
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SC_ALLOW(readv),
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#endif
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#ifdef __NR_rt_sigaction
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SC_ALLOW(rt_sigaction),
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#endif
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#ifdef __NR_rt_sigreturn
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SC_ALLOW(rt_sigreturn),
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#endif
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#ifdef __NR_sendmsg
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SC_ALLOW(sendmsg),
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#endif
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#ifdef __NR_sigreturn
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SC_ALLOW(sigreturn),
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#endif
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#ifdef __NR_statx
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SC_ALLOW(statx),
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#endif
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#ifdef __NR_ugetrlimit
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SC_ALLOW(ugetrlimit),
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#endif
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#ifdef __NR_write
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SC_ALLOW(write),
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#endif
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#ifdef __NR_writev
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SC_ALLOW(writev),
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#endif
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/* disallow everything else */
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BPF_STMT(BPF_RET | BPF_K, SC_FAIL),
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};
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#ifdef SC_DEBUG
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#include <signal.h>
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#include <unistd.h>
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static void
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sandbox_seccomp_violation(int signum, siginfo_t *info, void *ctx)
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{
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fprintf(stderr, "%s: unexpected system call (arch:0x%x,syscall:%d @ %p)\n",
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__func__, info->si_arch, info->si_syscall, info->si_call_addr);
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_exit(1);
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}
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static void
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sandbox_seccomp_catch_sigsys(void)
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{
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struct sigaction act;
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sigset_t mask;
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memset(&act, 0, sizeof(act));
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sigemptyset(&mask);
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sigaddset(&mask, SIGSYS);
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act.sa_sigaction = &sandbox_seccomp_violation;
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act.sa_flags = SA_SIGINFO;
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if (sigaction(SIGSYS, &act, NULL) == -1)
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fatal("%s: sigaction(SIGSYS): %s",
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__func__, strerror(errno));
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if (sigprocmask(SIG_UNBLOCK, &mask, NULL) == -1)
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fatal("%s: sigprocmask(SIGSYS): %s\n",
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__func__, strerror(errno));
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}
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#endif /* SC_DEBUG */
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#if HAVE_LANDLOCK
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static inline int
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open_landlock(void)
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{
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int fd;
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const struct landlock_ruleset_attr attr = {
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.handled_access_fs = LANDLOCK_ACCESS_FS_EXECUTE |
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LANDLOCK_ACCESS_FS_READ_FILE |
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LANDLOCK_ACCESS_FS_READ_DIR |
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LANDLOCK_ACCESS_FS_WRITE_FILE |
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LANDLOCK_ACCESS_FS_REMOVE_DIR |
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LANDLOCK_ACCESS_FS_REMOVE_FILE |
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LANDLOCK_ACCESS_FS_MAKE_CHAR |
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LANDLOCK_ACCESS_FS_MAKE_DIR |
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LANDLOCK_ACCESS_FS_MAKE_REG |
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LANDLOCK_ACCESS_FS_MAKE_SOCK |
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LANDLOCK_ACCESS_FS_MAKE_FIFO |
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LANDLOCK_ACCESS_FS_MAKE_BLOCK |
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LANDLOCK_ACCESS_FS_MAKE_SYM,
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};
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fd = landlock_create_ruleset(&attr, sizeof(attr), 0);
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if (fd == -1) {
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switch (errno) {
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case ENOSYS:
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fatal("%s: failed to create ruleset. "
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"Landlock doesn't seem to be supported by the "
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"current kernel.", __func__);
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case EOPNOTSUPP:
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log_warn(NULL, "%s: failed to create ruleset. "
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"Landlock seems to be currently disabled; "
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"continuing without it.", __func__);
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break;
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default:
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fatal("%s: failed to create ruleset: %s",
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__func__, strerror(errno));
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}
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}
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return fd;
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}
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static int
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landlock_unveil_path(int landlock_fd, const char *path, int perms)
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{
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struct landlock_path_beneath_attr pb;
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int err, saved_errno;
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pb.allowed_access = perms;
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if ((pb.parent_fd = open(path, O_PATH)) == -1)
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return -1;
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err = landlock_add_rule(landlock_fd, LANDLOCK_RULE_PATH_BENEATH,
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&pb, 0);
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saved_errno = errno;
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close(pb.parent_fd);
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errno = saved_errno;
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return err ? -1 : 0;
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}
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static int
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landlock_apply(int fd)
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{
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int r, saved_errno;
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if (fd == -1)
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return 0;
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r = landlock_restrict_self(fd, 0);
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saved_errno = errno;
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close(fd);
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errno = saved_errno;
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return r ? -1 : 0;
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}
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static int
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server_landlock(void)
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{
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int fd, perms;
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struct vhost *h;
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struct location *l;
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/*
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* These are all the actions allowed for the root directories
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* of the vhosts.
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*/
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perms = LANDLOCK_ACCESS_FS_READ_FILE | LANDLOCK_ACCESS_FS_READ_DIR;
|
|
|
|
if ((fd = open_landlock()) == -1)
|
|
return 0;
|
|
|
|
TAILQ_FOREACH(h, &hosts, vhosts) {
|
|
TAILQ_FOREACH(l, &h->locations, locations) {
|
|
if (*l->dir == '\0')
|
|
continue;
|
|
|
|
if (landlock_unveil_path(fd, l->dir, perms) == -1)
|
|
fatal("%s: landlock_unveil_path(%s): %s",
|
|
__func__, l->dir, strerror(errno));
|
|
}
|
|
}
|
|
|
|
return landlock_apply(fd);
|
|
}
|
|
|
|
static int
|
|
logger_landlock(void)
|
|
{
|
|
int fd;
|
|
|
|
if ((fd = open_landlock()) == -1)
|
|
return 0;
|
|
|
|
/* no rules. the logger doesn't need fs access at all. */
|
|
|
|
return landlock_apply(fd);
|
|
}
|
|
#endif
|
|
|
|
void
|
|
sandbox_server_process(int can_open_sockets)
|
|
{
|
|
const struct sock_fprog prog = {
|
|
.len = (unsigned short) (sizeof(filter) / sizeof(filter[0])),
|
|
.filter = filter,
|
|
};
|
|
|
|
/* can't seccomp/landlock if fastcgi or proxying are used. */
|
|
if (can_open_sockets)
|
|
return;
|
|
|
|
|
|
#ifdef SC_DEBUG
|
|
sandbox_seccomp_catch_sigsys();
|
|
#endif
|
|
|
|
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
|
|
fatal("%s: prctl(PR_SET_NO_NEW_PRIVS): %s",
|
|
__func__, strerror(errno));
|
|
|
|
#if HAVE_LANDLOCK
|
|
if (server_landlock() == -1)
|
|
fatal("%s: server_landlock: %s",
|
|
__func__, strerror(errno));
|
|
#endif
|
|
|
|
if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog) == -1)
|
|
fatal("%s: prctl(PR_SET_SECCOMP): %s\n",
|
|
__func__, strerror(errno));
|
|
}
|
|
|
|
void
|
|
sandbox_logger_process(void)
|
|
{
|
|
/*
|
|
* Here we could use a seccomp filter to allow only recvfd,
|
|
* write/writev and memory allocations, but syslog is a beast
|
|
* and I don't know what syscalls it could end up doing.
|
|
* Landlock is a simpler beast, use it to disallow any file
|
|
* sytsem access.
|
|
*/
|
|
|
|
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) == -1)
|
|
fatal("%s: prctl(PR_SET_NO_NEW_PRIVS): %s",
|
|
__func__, strerror(errno));
|
|
|
|
#if HAVE_LANDLOCK
|
|
if (logger_landlock() == -1)
|
|
fatal("%s: logger_landlock: %s",
|
|
__func__, strerror(errno));
|
|
#endif
|
|
|
|
return;
|
|
}
|
|
|
|
#elif defined(__OpenBSD__)
|
|
|
|
#include <unistd.h>
|
|
|
|
void
|
|
sandbox_server_process(int can_open_sockets)
|
|
{
|
|
struct vhost *h;
|
|
struct location *l;
|
|
|
|
TAILQ_FOREACH(h, &hosts, vhosts) {
|
|
TAILQ_FOREACH(l, &h->locations, locations) {
|
|
if (*l->dir == '\0')
|
|
continue;
|
|
|
|
if (unveil(l->dir, "r") == -1)
|
|
fatal("unveil %s for domain %s",
|
|
l->dir,
|
|
h->domain);
|
|
}
|
|
}
|
|
|
|
if (pledge("stdio recvfd rpath inet dns", NULL) == -1)
|
|
fatal("pledge");
|
|
}
|
|
|
|
void
|
|
sandbox_logger_process(void)
|
|
{
|
|
if (pledge("stdio recvfd", NULL) == -1)
|
|
err(1, "pledge");
|
|
}
|
|
|
|
#else
|
|
|
|
#warning "No sandbox method known for this OS"
|
|
|
|
void
|
|
sandbox_server_process(int can_open_sockets)
|
|
{
|
|
return;
|
|
}
|
|
|
|
void
|
|
sandbox_logger_process(void)
|
|
{
|
|
return;
|
|
}
|
|
|
|
#endif
|