bc1ace0b96
To make it easier to understand how Capsicum interacts with linkat() and
renameat(), rename the rights to CAP_{LINK,RENAME}AT_{SOURCE,TARGET}.
This also addresses a shortcoming in Capsicum, where it isn't possible
to disable linking to files stored in a directory. Creating hardlinks
essentially makes it possible to access files with additional rights.
Reviewed by: rwatson, wblock
Differential Revision: https://reviews.freebsd.org/D3411
509 lines
12 KiB
C
509 lines
12 KiB
C
/*-
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* Copyright (c) 2007-2011 Robert N. M. Watson
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/socket.h>
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#include <sys/sysctl.h>
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#include <sys/un.h>
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#include <sys/user.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <err.h>
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#include <libprocstat.h>
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "procstat.h"
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static const char *
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protocol_to_string(int domain, int type, int protocol)
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{
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switch (domain) {
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case AF_INET:
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case AF_INET6:
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switch (protocol) {
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case IPPROTO_TCP:
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return ("TCP");
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case IPPROTO_UDP:
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return ("UDP");
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case IPPROTO_ICMP:
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return ("ICM");
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case IPPROTO_RAW:
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return ("RAW");
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case IPPROTO_SCTP:
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return ("SCT");
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case IPPROTO_DIVERT:
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return ("IPD");
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default:
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return ("IP?");
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}
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case AF_LOCAL:
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switch (type) {
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case SOCK_STREAM:
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return ("UDS");
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case SOCK_DGRAM:
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return ("UDD");
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default:
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return ("UD?");
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}
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default:
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return ("?");
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}
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}
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static void
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addr_to_string(struct sockaddr_storage *ss, char *buffer, int buflen)
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{
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char buffer2[INET6_ADDRSTRLEN];
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struct sockaddr_in6 *sin6;
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struct sockaddr_in *sin;
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struct sockaddr_un *sun;
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switch (ss->ss_family) {
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case AF_LOCAL:
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sun = (struct sockaddr_un *)ss;
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if (strlen(sun->sun_path) == 0)
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strlcpy(buffer, "-", buflen);
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else
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strlcpy(buffer, sun->sun_path, buflen);
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break;
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case AF_INET:
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sin = (struct sockaddr_in *)ss;
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snprintf(buffer, buflen, "%s:%d", inet_ntoa(sin->sin_addr),
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ntohs(sin->sin_port));
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break;
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case AF_INET6:
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sin6 = (struct sockaddr_in6 *)ss;
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if (inet_ntop(AF_INET6, &sin6->sin6_addr, buffer2,
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sizeof(buffer2)) != NULL)
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snprintf(buffer, buflen, "%s.%d", buffer2,
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ntohs(sin6->sin6_port));
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else
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strlcpy(buffer, "-", buflen);
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break;
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default:
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strlcpy(buffer, "", buflen);
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break;
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}
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}
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static void
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print_address(struct sockaddr_storage *ss)
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{
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char addr[PATH_MAX];
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addr_to_string(ss, addr, sizeof(addr));
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printf("%s", addr);
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}
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static struct cap_desc {
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uint64_t cd_right;
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const char *cd_desc;
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} cap_desc[] = {
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/* General file I/O. */
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{ CAP_READ, "rd" },
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{ CAP_WRITE, "wr" },
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{ CAP_SEEK, "se" },
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{ CAP_MMAP, "mm" },
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{ CAP_CREATE, "cr" },
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{ CAP_FEXECVE, "fe" },
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{ CAP_FSYNC, "fy" },
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{ CAP_FTRUNCATE, "ft" },
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/* VFS methods. */
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{ CAP_FCHDIR, "cd" },
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{ CAP_FCHFLAGS, "cf" },
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{ CAP_FCHMOD, "cm" },
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{ CAP_FCHOWN, "cn" },
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{ CAP_FCNTL, "fc" },
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{ CAP_FLOCK, "fl" },
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{ CAP_FPATHCONF, "fp" },
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{ CAP_FSCK, "fk" },
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{ CAP_FSTAT, "fs" },
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{ CAP_FSTATFS, "sf" },
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{ CAP_FUTIMES, "fu" },
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{ CAP_LINKAT_SOURCE, "ls" },
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{ CAP_LINKAT_TARGET, "lt" },
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{ CAP_MKDIRAT, "md" },
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{ CAP_MKFIFOAT, "mf" },
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{ CAP_MKNODAT, "mn" },
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{ CAP_RENAMEAT_SOURCE, "rs" },
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{ CAP_RENAMEAT_TARGET, "rt" },
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{ CAP_SYMLINKAT, "sl" },
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{ CAP_UNLINKAT, "un" },
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/* Lookups - used to constrain *at() calls. */
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{ CAP_LOOKUP, "lo" },
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/* Extended attributes. */
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{ CAP_EXTATTR_GET, "eg" },
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{ CAP_EXTATTR_SET, "es" },
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{ CAP_EXTATTR_DELETE, "ed" },
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{ CAP_EXTATTR_LIST, "el" },
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/* Access Control Lists. */
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{ CAP_ACL_GET, "ag" },
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{ CAP_ACL_SET, "as" },
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{ CAP_ACL_DELETE, "ad" },
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{ CAP_ACL_CHECK, "ac" },
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/* Socket operations. */
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{ CAP_ACCEPT, "at" },
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{ CAP_BIND, "bd" },
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{ CAP_CONNECT, "co" },
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{ CAP_GETPEERNAME, "pn" },
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{ CAP_GETSOCKNAME, "sn" },
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{ CAP_GETSOCKOPT, "gs" },
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{ CAP_LISTEN, "ln" },
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{ CAP_PEELOFF, "pf" },
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{ CAP_SETSOCKOPT, "ss" },
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{ CAP_SHUTDOWN, "sh" },
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/* Mandatory Access Control. */
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{ CAP_MAC_GET, "mg" },
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{ CAP_MAC_SET, "ms" },
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/* Methods on semaphores. */
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{ CAP_SEM_GETVALUE, "sg" },
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{ CAP_SEM_POST, "sp" },
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{ CAP_SEM_WAIT, "sw" },
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/* Event monitoring and posting. */
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{ CAP_EVENT, "ev" },
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{ CAP_KQUEUE_EVENT, "ke" },
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{ CAP_KQUEUE_CHANGE, "kc" },
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/* Strange and powerful rights that should not be given lightly. */
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{ CAP_IOCTL, "io" },
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{ CAP_TTYHOOK, "ty" },
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/* Process management via process descriptors. */
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{ CAP_PDGETPID, "pg" },
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{ CAP_PDWAIT, "pw" },
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{ CAP_PDKILL, "pk" },
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/*
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* Rights that allow to use bindat(2) and connectat(2) syscalls on a
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* directory descriptor.
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*/
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{ CAP_BINDAT, "ba" },
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{ CAP_CONNECTAT, "ca" },
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/* Aliases and defines that combine multiple rights. */
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{ CAP_PREAD, "prd" },
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{ CAP_PWRITE, "pwr" },
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{ CAP_MMAP_R, "mmr" },
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{ CAP_MMAP_W, "mmw" },
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{ CAP_MMAP_X, "mmx" },
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{ CAP_MMAP_RW, "mrw" },
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{ CAP_MMAP_RX, "mrx" },
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{ CAP_MMAP_WX, "mwx" },
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{ CAP_MMAP_RWX, "mma" },
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{ CAP_RECV, "re" },
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{ CAP_SEND, "sd" },
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{ CAP_SOCK_CLIENT, "scl" },
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{ CAP_SOCK_SERVER, "ssr" },
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};
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static const u_int cap_desc_count = sizeof(cap_desc) /
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sizeof(cap_desc[0]);
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static u_int
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width_capability(cap_rights_t *rightsp)
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{
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u_int count, i, width;
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count = 0;
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width = 0;
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for (i = 0; i < cap_desc_count; i++) {
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if (cap_rights_is_set(rightsp, cap_desc[i].cd_right)) {
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width += strlen(cap_desc[i].cd_desc);
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if (count)
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width++;
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count++;
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}
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}
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return (width);
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}
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static void
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print_capability(cap_rights_t *rightsp, u_int capwidth)
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{
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u_int count, i, width;
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count = 0;
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width = 0;
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for (i = width_capability(rightsp); i < capwidth; i++) {
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if (i != 0)
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printf(" ");
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else
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printf("-");
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}
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for (i = 0; i < cap_desc_count; i++) {
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if (cap_rights_is_set(rightsp, cap_desc[i].cd_right)) {
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printf("%s%s", count ? "," : "", cap_desc[i].cd_desc);
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width += strlen(cap_desc[i].cd_desc);
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if (count)
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width++;
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count++;
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}
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}
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}
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void
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procstat_files(struct procstat *procstat, struct kinfo_proc *kipp)
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{
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struct sockstat sock;
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struct filestat_list *head;
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struct filestat *fst;
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const char *str;
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struct vnstat vn;
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u_int capwidth, width;
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int error;
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/*
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* To print the header in capability mode, we need to know the width
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* of the widest capability string. Even if we get no processes
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* back, we will print the header, so we defer aborting due to a lack
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* of processes until after the header logic.
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*/
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capwidth = 0;
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head = procstat_getfiles(procstat, kipp, 0);
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if (head != NULL && Cflag) {
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STAILQ_FOREACH(fst, head, next) {
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width = width_capability(&fst->fs_cap_rights);
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if (width > capwidth)
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capwidth = width;
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}
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if (capwidth < strlen("CAPABILITIES"))
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capwidth = strlen("CAPABILITIES");
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}
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if (!hflag) {
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if (Cflag)
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printf("%5s %-16s %5s %1s %-8s %-*s "
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"%-3s %-12s\n", "PID", "COMM", "FD", "T",
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"FLAGS", capwidth, "CAPABILITIES", "PRO",
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"NAME");
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else
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printf("%5s %-16s %5s %1s %1s %-8s "
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"%3s %7s %-3s %-12s\n", "PID", "COMM", "FD", "T",
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"V", "FLAGS", "REF", "OFFSET", "PRO", "NAME");
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}
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if (head == NULL)
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return;
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STAILQ_FOREACH(fst, head, next) {
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printf("%5d ", kipp->ki_pid);
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printf("%-16s ", kipp->ki_comm);
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if (fst->fs_uflags & PS_FST_UFLAG_CTTY)
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printf(" ctty ");
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else if (fst->fs_uflags & PS_FST_UFLAG_CDIR)
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printf(" cwd ");
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else if (fst->fs_uflags & PS_FST_UFLAG_JAIL)
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printf(" jail ");
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else if (fst->fs_uflags & PS_FST_UFLAG_RDIR)
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printf(" root ");
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else if (fst->fs_uflags & PS_FST_UFLAG_TEXT)
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printf(" text ");
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else if (fst->fs_uflags & PS_FST_UFLAG_TRACE)
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printf("trace ");
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else
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printf("%5d ", fst->fs_fd);
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switch (fst->fs_type) {
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case PS_FST_TYPE_VNODE:
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str = "v";
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break;
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case PS_FST_TYPE_SOCKET:
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str = "s";
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break;
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case PS_FST_TYPE_PIPE:
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str = "p";
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break;
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case PS_FST_TYPE_FIFO:
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str = "f";
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break;
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case PS_FST_TYPE_KQUEUE:
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str = "k";
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break;
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case PS_FST_TYPE_CRYPTO:
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str = "c";
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break;
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case PS_FST_TYPE_MQUEUE:
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str = "m";
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break;
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case PS_FST_TYPE_SHM:
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str = "h";
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break;
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case PS_FST_TYPE_PTS:
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str = "t";
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break;
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case PS_FST_TYPE_SEM:
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str = "e";
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break;
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case PS_FST_TYPE_NONE:
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case PS_FST_TYPE_UNKNOWN:
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default:
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str = "?";
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break;
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}
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printf("%1s ", str);
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if (!Cflag) {
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str = "-";
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if (fst->fs_type == PS_FST_TYPE_VNODE) {
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error = procstat_get_vnode_info(procstat, fst,
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&vn, NULL);
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switch (vn.vn_type) {
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case PS_FST_VTYPE_VREG:
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str = "r";
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break;
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case PS_FST_VTYPE_VDIR:
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str = "d";
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break;
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case PS_FST_VTYPE_VBLK:
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str = "b";
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break;
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case PS_FST_VTYPE_VCHR:
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str = "c";
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break;
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case PS_FST_VTYPE_VLNK:
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str = "l";
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break;
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case PS_FST_VTYPE_VSOCK:
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str = "s";
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break;
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case PS_FST_VTYPE_VFIFO:
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str = "f";
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break;
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case PS_FST_VTYPE_VBAD:
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str = "x";
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break;
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case PS_FST_VTYPE_VNON:
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case PS_FST_VTYPE_UNKNOWN:
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default:
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str = "?";
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break;
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}
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}
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printf("%1s ", str);
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}
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_READ ? "r" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_WRITE ? "w" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_APPEND ? "a" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_ASYNC ? "s" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_SYNC ? "f" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_NONBLOCK ? "n" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_DIRECT ? "d" : "-");
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printf("%s", fst->fs_fflags & PS_FST_FFLAG_HASLOCK ? "l" : "-");
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printf(" ");
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if (!Cflag) {
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if (fst->fs_ref_count > -1)
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printf("%3d ", fst->fs_ref_count);
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else
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printf("%3c ", '-');
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if (fst->fs_offset > -1)
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printf("%7jd ", (intmax_t)fst->fs_offset);
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else
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printf("%7c ", '-');
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}
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if (Cflag) {
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print_capability(&fst->fs_cap_rights, capwidth);
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printf(" ");
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}
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switch (fst->fs_type) {
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case PS_FST_TYPE_SOCKET:
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error = procstat_get_socket_info(procstat, fst, &sock, NULL);
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if (error != 0)
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break;
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printf("%-3s ",
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protocol_to_string(sock.dom_family,
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sock.type, sock.proto));
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/*
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* While generally we like to print two addresses,
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* local and peer, for sockets, it turns out to be
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* more useful to print the first non-nul address for
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* local sockets, as typically they aren't bound and
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* connected, and the path strings can get long.
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*/
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if (sock.dom_family == AF_LOCAL) {
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struct sockaddr_un *sun =
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(struct sockaddr_un *)&sock.sa_local;
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if (sun->sun_path[0] != 0)
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print_address(&sock.sa_local);
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else
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print_address(&sock.sa_peer);
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} else {
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print_address(&sock.sa_local);
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printf(" ");
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print_address(&sock.sa_peer);
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}
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break;
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default:
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printf("%-3s ", "-");
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printf("%-18s", fst->fs_path != NULL ? fst->fs_path : "-");
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}
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printf("\n");
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}
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procstat_freefiles(procstat, head);
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}
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