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Make use of Casper's system.pwd and system.grp services when the -r option

Browse source 
is given to convert uids and gids to user names and group names even when
running in capability mode sandbox.

While here log on stderr when we successfully enter the sandbox.

Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Pawel Jakub Dawidek 2013-12-15 23:09:05 +00:00
parent 252e504548
commit 4622f0e183
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=259434
2 changed files with 114 additions and 3 deletions
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6
usr.bin/kdump/Makefile
View file

@ -12,6 +12,12 @@ SRCS= kdump_subr.c kdump.c ioctl.c subr.c
DPSRCS= kdump_subr.h
CFLAGS+= -I${.CURDIR}/../ktrace -I${.CURDIR} -I${.CURDIR}/../.. -I.
.if ${MK_CASPER} != "no"
DPADD+= ${LIBCAPSICUM} ${LIBNV}
LDADD+= -lcapsicum -lnv
CFLAGS+=-DHAVE_LIBCAPSICUM
.endif
.if ${MACHINE_ARCH} == "amd64" || ${MACHINE_ARCH} == "i386"
SRCS+= linux_syscalls.c
.endif

111
usr.bin/kdump/kdump.c
View file

@ -74,9 +74,18 @@ extern int errno;
#include <err.h>
#include <grp.h>
#include <inttypes.h>
#ifdef HAVE_LIBCAPSICUM
#include <libcapsicum.h>
#include <libcapsicum_grp.h>
#include <libcapsicum_pwd.h>
#include <libcapsicum_service.h>
#endif
#include <locale.h>
#include <netdb.h>
#include <nl_types.h>
#ifdef HAVE_LIBCAPSICUM
#include <nv.h>
#endif
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
@ -167,6 +176,10 @@ struct proc_info
TAILQ_HEAD(trace_procs, proc_info) trace_procs;
#ifdef HAVE_LIBCAPSICUM
static cap_channel_t *cappwd, *capgrp;
#endif
static void
strerror_init(void)
{
@ -192,6 +205,64 @@ localtime_init(void)
(void)localtime(&ltime);
}
#ifdef HAVE_LIBCAPSICUM
static int
cappwdgrp_setup(cap_channel_t **cappwdp, cap_channel_t **capgrpp)
{
cap_channel_t *capcas, *cappwdloc, *capgrploc;
const char *cmds[1], *fields[1];
capcas = cap_init();
if (capcas == NULL) {
warn("unable to contact casperd");
return (NULL);
}
cappwdloc = cap_service_open(capcas, "system.pwd");
capgrploc = cap_service_open(capcas, "system.grp");
/* Casper capability no longer needed. */
cap_close(capcas);
if (cappwdloc == NULL || capgrploc == NULL) {
if (cappwdloc == NULL)
warn("unable to open system.pwd service");
if (capgrploc == NULL)
warn("unable to open system.grp service");
goto fail;
}
/* Limit system.pwd to only getpwuid() function and pw_name field. */
cmds[0] = "getpwuid";
if (cap_pwd_limit_cmds(cappwdloc, cmds, 1) < 0) {
warn("unable to limit access to system.pwd service");
goto fail;
}
fields[0] = "pw_name";
if (cap_pwd_limit_fields(cappwdloc, fields, 1) < 0) {
warn("unable to limit access to system.pwd service");
goto fail;
}
/* Limit system.grp to only getgrgid() function and gr_name field. */
cmds[0] = "getgrgid";
if (cap_grp_limit_cmds(capgrploc, cmds, 1) < 0) {
warn("unable to limit access to system.grp service");
goto fail;
}
fields[0] = "gr_name";
if (cap_grp_limit_fields(capgrploc, fields, 1) < 0) {
warn("unable to limit access to system.grp service");
goto fail;
}
*cappwdp = cappwdloc;
*capgrpp = capgrploc;
return (0);
fail:
if (capgrploc == NULL)
cap_close(cappwdloc);
if (capgrploc == NULL)
cap_close(capgrploc);
return (-1);
}
#endif /* HAVE_LIBCAPSICUM */
int
main(int argc, char *argv[])
{
@ -265,14 +336,28 @@ main(int argc, char *argv[])
strerror_init();
localtime_init();
#ifdef HAVE_LIBCAPSICUM
if (resolv != 0) {
if (cappwdgrp_setup(&cappwd, &capgrp) < 0) {
cappwd = NULL;
capgrp = NULL;
}
}
if (resolv == 0 || (cappwd != NULL && capgrp != NULL)) {
if (cap_enter() < 0 && errno != ENOSYS)
err(1, "unable to enter capability mode");
}
#else
if (resolv == 0) {
if (cap_enter() < 0 && errno != ENOSYS)
err(1, "unable to enter capability mode");
}
#endif
limitfd(STDIN_FILENO);
limitfd(STDOUT_FILENO);
limitfd(STDERR_FILENO);
if (cap_sandboxed())
fprintf(stderr, "capability mode sandbox enabled\n");
TAILQ_INIT(&trace_procs);
drop_logged = 0;
@ -1664,11 +1749,31 @@ ktrstat(struct stat *statp)
printf("mode=%s, ", mode);
}
printf("nlink=%ju, ", (uintmax_t)statp->st_nlink);
if (resolv == 0 || (pwd = getpwuid(statp->st_uid)) == NULL)
if (resolv == 0) {
pwd = NULL;
} else {
#ifdef HAVE_LIBCAPSICUM
if (cappwd != NULL)
pwd = cap_getpwuid(cappwd, statp->st_uid);
else
#endif
pwd = getpwuid(statp->st_uid);
}
if (pwd == NULL)
printf("uid=%ju, ", (uintmax_t)statp->st_uid);
else
printf("uid=\"%s\", ", pwd->pw_name);
if (resolv == 0 || (grp = getgrgid(statp->st_gid)) == NULL)
if (resolv == 0) {
grp = NULL;
} else {
#ifdef HAVE_LIBCAPSICUM
if (capgrp != NULL)
grp = cap_getgrgid(capgrp, statp->st_gid);
else
#endif
grp = getgrgid(statp->st_gid);
}
if (grp == NULL)
printf("gid=%ju, ", (uintmax_t)statp->st_gid);
else
printf("gid=\"%s\", ", grp->gr_name);