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util: introduce our own gperf based capability list

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This way, we can ensure we have a more complete, up-to-date list of
capabilities around, always.
This commit is contained in:
Lennart Poettering 2014-12-10 03:16:14 +01:00
parent 45823da23c
commit 2822da4fb7
12 changed files with 215 additions and 23 deletions
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1
.gitignore vendored
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@ -152,6 +152,7 @@
/test-bus-zero-copy
/test-calendarspec
/test-capability
/test-cap-list
/test-catalog
/test-cgroup
/test-cgroup-mask

34
Makefile.am
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@ -863,6 +863,8 @@ libsystemd_shared_la_SOURCES = \
src/shared/af-list.h \
src/shared/arphrd-list.c \
src/shared/arphrd-list.h \
src/shared/cap-list.c \
src/shared/cap-list.h \
src/shared/audit.c \
src/shared/audit.h \
src/shared/xml.c \
@ -903,7 +905,9 @@ nodist_libsystemd_shared_la_SOURCES = \
src/shared/af-from-name.h \
src/shared/af-to-name.h \
src/shared/arphrd-from-name.h \
src/shared/arphrd-to-name.h
src/shared/arphrd-to-name.h \
src/shared/cap-from-name.h \
src/shared/cap-to-name.h
libsystemd_shared_la_CFLAGS = \
$(AM_CFLAGS) \
@ -1191,6 +1195,8 @@ CLEANFILES += \
src/shared/af-from-name.gperf \
src/shared/arphrd-list.txt \
src/shared/arphrd-from-name.gperf \
src/shared/cap-list.txt \
src/shared/cap-from-name.gperf \
src/resolve/dns_type-list.txt \
src/resolve/dns_type-from-name.gperf
@ -1201,6 +1207,8 @@ BUILT_SOURCES += \
src/shared/af-to-name.h \
src/shared/arphrd-from-name.h \
src/shared/arphrd-to-name.h \
src/shared/cap-from-name.h \
src/shared/cap-to-name.h \
src/resolve/dns_type-from-name.h \
src/resolve/dns_type-to-name.h
@ -1226,6 +1234,7 @@ src/shared/af-list.txt:
src/shared/af-to-name.h: src/shared/af-list.txt
$(AM_V_GEN)$(AWK) 'BEGIN{ print "static const char* const af_names[] = { "} !/AF_FILE/ && !/AF_ROUTE/ && !/AF_LOCAL/ { printf "[%s] = \"%s\",\n", $$1, $$1 } END{print "};"}' <$< >$@
src/shared/arphrd-list.txt:
$(AM_V_at)$(MKDIR_P) $(dir $@)
$(AM_V_GEN)$(CPP) $(CFLAGS) $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include net/if_arp.h - </dev/null | $(AWK) '/^#define[ \t]+ARPHRD_[^ \t]+[ \t]+[^ \t]/ { print $$2; }' | sed -e 's/ARPHRD_//' >$@
@ -1237,6 +1246,20 @@ src/shared/arphrd-from-name.gperf: src/shared/arphrd-list.txt
$(AM_V_GEN)$(AWK) 'BEGIN{ print "struct arphrd_name { const char* name; int id; };"; print "%null-strings"; print "%%";} { printf "%s, ARPHRD_%s\n", $$1, $$1 }' <$< >$@
src/shared/cap-list.txt:
$(AM_V_at)$(MKDIR_P) $(dir $@)
$(AM_V_GEN)$(CPP) $(CFLAGS) $(AM_CPPFLAGS) $(CPPFLAGS) -dM -include linux/capability.h -include missing.h - </dev/null | $(AWK) '/^#define[ \t]+CAP_[A-Z_]+[ \t]+/ { print $$2; }' | grep -v CAP_LAST_CAP >$@
src/shared/cap-to-name.h: src/shared/cap-list.txt
$(AM_V_GEN)$(AWK) 'BEGIN{ print "static const char* const capability_names[] = { "} { printf "[%s] = \"%s\",\n", $$1, $$1 } END{print "};"}' <$< >$@
src/shared/cap-from-name.gperf: src/shared/cap-list.txt
$(AM_V_GEN)$(AWK) 'BEGIN{ print "struct capability_name { const char* name; int id; };"; print "%null-strings"; print "%%";} { printf "%s, %s\n", $$1, $$1 }' <$< >$@
src/shared/cap-from-name.h: src/shared/cap-from-name.gperf
$(AM_V_GPERF)$(GPERF) -L ANSI-C -t --ignore-case -N lookup_capability -H hash_capability_name -p -C <$< >$@
src/resolve/dns_type-list.txt: src/resolve/dns-type.h
$(AM_V_at)$(MKDIR_P) $(dir $@)
$(AM_V_GEN)$(SED) -n -r 's/.* DNS_TYPE_(\w+).*/\1/p' <$< >$@
@ -1353,7 +1376,8 @@ tests += \
test-bus-policy \
test-locale-util \
test-execute \
test-copy
test-copy \
test-cap-list
EXTRA_DIST += \
test/a.service \
@ -1579,6 +1603,12 @@ test_uid_range_SOURCES = \
test_uid_range_LDADD = \
libsystemd-shared.la
test_cap_list_SOURCES = \
src/test/test-cap-list.c
test_cap_list_LDADD = \
libsystemd-shared.la
test_socket_util_SOURCES = \
src/test/test-socket-util.c

10
src/core/execute.c
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@ -86,6 +86,7 @@
#include "smack-util.h"
#include "bus-kernel.h"
#include "label.h"
#include "cap-list.h"
#ifdef HAVE_SECCOMP
#include "seccomp-util.h"
@ -2296,13 +2297,8 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) {
fprintf(f, "%sCapabilityBoundingSet:", prefix);
for (l = 0; l <= cap_last_cap(); l++)
if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l))) {
_cleanup_cap_free_charp_ char *t;
t = cap_to_name(l);
if (t)
fprintf(f, " %s", t);
}
if (!(c->capability_bounding_set_drop & ((uint64_t) 1ULL << (uint64_t) l)))
fprintf(f, " %s", strna(capability_to_name(l)));
fputs("\n", f);
}

11
src/core/load-fragment.c
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@ -59,6 +59,7 @@
#include "bus-error.h"
#include "errno-list.h"
#include "af-list.h"
#include "cap-list.h"
#ifdef HAVE_SECCOMP
#include "seccomp-util.h"
@ -1040,17 +1041,15 @@ int config_parse_bounding_set(const char *unit,
FOREACH_WORD_QUOTED(word, l, rvalue, state) {
_cleanup_free_ char *t = NULL;
int r;
cap_value_t cap;
int cap;
t = strndup(word, l);
if (!t)
return log_oom();
r = cap_from_name(t, &cap);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, errno,
"Failed to parse capability in bounding set, ignoring: %s", t);
cap = capability_from_name(t);
if (cap < 0) {
log_syntax(unit, LOG_ERR, filename, line, errno, "Failed to parse capability in bounding set, ignoring: %s", t);
continue;
}

5
src/libsystemd/sd-bus/bus-dump.c
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@ -24,6 +24,7 @@
#include "strv.h"
#include "audit.h"
#include "macro.h"
#include "cap-list.h"
#include "bus-message.h"
#include "bus-internal.h"
@ -290,15 +291,13 @@ static void dump_capabilities(
for (;;) {
if (r > 0) {
_cleanup_cap_free_charp_ char *t;
if (n > 0)
fputc(' ', f);
if (n % 4 == 3)
fprintf(f, terse ? "\n " : "\n ");
t = cap_to_name(i);
fprintf(f, "%s", t);
fprintf(f, "%s", strna(capability_to_name(i)));
n++;
}

7
src/nspawn/nspawn.c
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@ -90,6 +90,7 @@
#include "base-filesystem.h"
#include "barrier.h"
#include "event-util.h"
#include "cap-list.h"
#ifdef HAVE_SECCOMP
#include "seccomp-util.h"
@ -401,7 +402,6 @@ static int parse_argv(int argc, char *argv[]) {
FOREACH_WORD_SEPARATOR(word, length, optarg, ",", state) {
_cleanup_free_ char *t;
cap_value_t cap;
t = strndup(word, length);
if (!t)
@ -413,7 +413,10 @@ static int parse_argv(int argc, char *argv[]) {
else
minus = (uint64_t) -1;
} else {
if (cap_from_name(t, &cap) < 0) {
int cap;
cap = capability_from_name(t);
if (cap < 0) {
log_error("Failed to parse capability %s.", t);
return -EINVAL;
}

4
src/shared/.gitignore vendored
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@ -1,3 +1,7 @@
/cap-from-name.gperf
/cap-from-name.h
/cap-list.txt
/cap-to-name.h
/errno-from-name.gperf
/errno-from-name.h
/errno-list.txt

62
src/shared/cap-list.c Normal file
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@ -0,0 +1,62 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <linux/capability.h>
#include <string.h>
#include "util.h"
#include "cap-list.h"
#include "missing.h"
static const struct capability_name* lookup_capability(register const char *str, register unsigned int len);
#include "cap-to-name.h"
#include "cap-from-name.h"
const char *capability_to_name(int id) {
if (id < 0)
return NULL;
if (id >= (int) ELEMENTSOF(capability_names))
return NULL;
return capability_names[id];
}
int capability_from_name(const char *name) {
const struct capability_name *sc;
int r, i;
assert(name);
/* Try to parse numeric capability */
r = safe_atoi(name, &i);
if (r >= 0 && i >= 0)
return i;
/* Try to parse string capability */
sc = lookup_capability(name, strlen(name));
if (!sc)
return -EINVAL;
return sc->id;
}

25
src/shared/cap-list.h Normal file
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@ -0,0 +1,25 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
#pragma once
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
const char *capability_to_name(int id);
int capability_from_name(const char *name);

7
src/shared/condition.c
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@ -39,6 +39,7 @@
#include "selinux-util.h"
#include "audit.h"
#include "condition.h"
#include "cap-list.h"
Condition* condition_new(ConditionType type, const char *parameter, bool trigger, bool negate) {
Condition *c;
@ -235,7 +236,7 @@ static int condition_test_security(Condition *c) {
static int condition_test_capability(Condition *c) {
_cleanup_fclose_ FILE *f = NULL;
cap_value_t value;
int value;
char line[LINE_MAX];
unsigned long long capabilities = -1;
@ -244,8 +245,8 @@ static int condition_test_capability(Condition *c) {
assert(c->type == CONDITION_CAPABILITY);
/* If it's an invalid capability, we don't have it */
if (cap_from_name(c->parameter, &value) < 0)
value = capability_from_name(c->parameter);
if (value < 0)
return -EINVAL;
/* If it's a valid capability we default to assume

25
src/shared/missing.h
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@ -34,6 +34,7 @@
#include <linux/if_link.h>
#include <linux/loop.h>
#include <linux/audit.h>
#include <linux/capability.h>
#ifdef HAVE_AUDIT
#include <libaudit.h>
@ -606,3 +607,27 @@ static inline int setns(int fd, int nstype) {
#ifndef AUDIT_NLGRP_MAX
#define AUDIT_NLGRP_READLOG 1
#endif
#ifndef CAP_MAC_OVERRIDE
#define CAP_MAC_OVERRIDE 32
#endif
#ifndef CAP_MAC_ADMIN
#define CAP_MAC_ADMIN 33
#endif
#ifndef CAP_SYSLOG
#define CAP_SYSLOG 34
#endif
#ifndef CAP_WAKE_ALARM
#define CAP_WAKE_ALARM 35
#endif
#ifndef CAP_BLOCK_SUSPEND
#define CAP_BLOCK_SUSPEND 36
#endif
#ifndef CAP_AUDIT_READ
#define CAP_AUDIT_READ 37
#endif

47
src/test/test-cap-list.c Normal file
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@ -0,0 +1,47 @@
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2014 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "log.h"
#include "cap-list.h"
#include "capability.h"
int main(int argc, char *argv[]) {
int i;
assert_se(!capability_to_name(-1));
assert_se(!capability_to_name(cap_last_cap()+1));
for (i = 0; i <= (int) cap_last_cap(); i++) {
const char *n;
assert_se(n = capability_to_name(i));
assert_se(capability_from_name(n) == i);
printf("%s = %i\n", n, i);
}
assert_se(capability_from_name("asdfbsd") == -EINVAL);
assert_se(capability_from_name("CAP_AUDIT_READ") == CAP_AUDIT_READ);
assert_se(capability_from_name("0") == 0);
assert_se(capability_from_name("15") == 15);
assert_se(capability_from_name("-1") == -EINVAL);
return 0;
}