tor-commits February 2018

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1579 discussions

[tor/release-0.2.9] Check the libc version to decide whether to allow openat.
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 2d3904aba67e79e57db1814033b1df3f77336065 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Nov 16 14:06:38 2017 -0500 Check the libc version to decide whether to allow openat. --- configure.ac | 2 ++ src/common/sandbox.c | 38 +++++++++++++++++++++++++++++++++++++- 2 files changed, 39 insertions(+), 1 deletion(-) diff --git a/configure.ac b/configure.ac index f2c3f90ba..3ff819052 100644 --- a/configure.ac +++ b/configure.ac @@ -390,6 +390,7 @@ AC_CHECK_FUNCS( getrlimit \ gettimeofday \ gmtime_r \ + gnu_get_libc_version \ htonll \ inet_aton \ ioctl \ @@ -1011,6 +1012,7 @@ AC_CHECK_HEADERS([assert.h \ arpa/inet.h \ crt_externs.h \ execinfo.h \ + gnu/libc-version.h \ grp.h \ ifaddrs.h \ inttypes.h \ diff --git a/src/common/sandbox.c b/src/common/sandbox.c index 417c1e305..d0ead2cae 100644 --- a/src/common/sandbox.c +++ b/src/common/sandbox.c @@ -56,6 +56,9 @@ #include <time.h> #include <poll.h> +#ifdef HAVE_GNU_LIBC_VERSION_H +#include <gnu/libc-version.h> +#endif #ifdef HAVE_LINUX_NETFILTER_IPV4_H #include <linux/netfilter_ipv4.h> #endif @@ -424,6 +427,37 @@ sb_mmap2(scmp_filter_ctx ctx, sandbox_cfg_t *filter) } #endif +#ifdef HAVE_GNU_LIBC_VERSION_H +#ifdef HAVE_GNU_GET_LIBC_VERSION +#define CHECK_LIBC_VERSION +#endif +#endif + +/* Return true if we think we're running with a libc that always uses + * openat on linux. */ +static int +libc_uses_openat_for_everything(void) +{ +#ifdef CHECK_LIBC_VERSION + const char *version = gnu_get_libc_version(); + if (version == NULL) + return 0; + + int major = -1; + int minor = -1; + + tor_sscanf(version, "%d.%d", &major, &minor); + if (major >= 3) + return 1; + else if (major == 2 && minor >= 26) + return 1; + else + return 0; +#else + return 0; +#endif +} + /** Allow a single file to be opened. If <b>use_openat</b> is true, * we're using a libc that remaps all the opens into openats. */ static int @@ -449,13 +483,15 @@ sb_open(scmp_filter_ctx ctx, sandbox_cfg_t *filter) int rc; sandbox_cfg_t *elem = NULL; + int use_openat = libc_uses_openat_for_everything(); + // for each dynamic parameter filters for (elem = filter; elem != NULL; elem = elem->next) { smp_param_t *param = elem->param; if (param != NULL && param->prot == 1 && param->syscall == SCMP_SYS(open)) { - rc = allow_file_open(ctx, 0 /* XXXX */, param->value); + rc = allow_file_open(ctx, use_openat, param->value); if (rc != 0) { log_err(LD_BUG,"(Sandbox) failed to add open syscall, received " "libseccomp error %d", rc);

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[tor/release-0.2.9] Merge branch 'ticket24315_029' into maint-0.2.9
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 848ba26c188c43cb97a22d5911fceb3714a97272 Merge: 5dc785cee 80bf27040 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Feb 11 18:07:37 2018 -0500 Merge branch 'ticket24315_029' into maint-0.2.9 changes/ticket24315 | 3 +++ configure.ac | 2 ++ src/common/sandbox.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 72 insertions(+), 4 deletions(-)

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[tor/release-0.3.1] Make our seccomp2 sandbox handle Glibc 2.26
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit d2d6a1b082fa0eac8b6478889a0c28bf05e48073 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Nov 16 13:53:48 2017 -0500 Make our seccomp2 sandbox handle Glibc 2.26 There are three changes here: * We need to allow epoll_pwait. * We need to allow PF_NETLINK sockets to be opened with SOCK_CLOEXEC. * We need to use openat() instead of open(). Note that this fix is not complete, since the openat() change is turned off. The next commit will make the openat() change happen when we're running glibc 2.26 or later. Fix for 24315. --- src/common/sandbox.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/src/common/sandbox.c b/src/common/sandbox.c index 7f4511db2..417c1e305 100644 --- a/src/common/sandbox.c +++ b/src/common/sandbox.c @@ -127,6 +127,9 @@ static int filter_nopar_gen[] = { SCMP_SYS(clone), SCMP_SYS(epoll_create), SCMP_SYS(epoll_wait), +#ifdef __NR_epoll_pwait + SCMP_SYS(epoll_pwait), +#endif #ifdef HAVE_EVENTFD SCMP_SYS(eventfd2), #endif @@ -421,6 +424,21 @@ sb_mmap2(scmp_filter_ctx ctx, sandbox_cfg_t *filter) } #endif +/** Allow a single file to be opened. If <b>use_openat</b> is true, + * we're using a libc that remaps all the opens into openats. */ +static int +allow_file_open(scmp_filter_ctx ctx, int use_openat, const char *file) +{ + if (use_openat) { + return seccomp_rule_add_2(ctx, SCMP_ACT_ALLOW, SCMP_SYS(openat), + SCMP_CMP_STR(0, SCMP_CMP_EQ, AT_FDCWD), + SCMP_CMP_STR(1, SCMP_CMP_EQ, file)); + } else { + return seccomp_rule_add_1(ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), + SCMP_CMP_STR(0, SCMP_CMP_EQ, file)); + } +} + /** * Function responsible for setting up the open syscall for * the seccomp filter sandbox. @@ -437,8 +455,7 @@ sb_open(scmp_filter_ctx ctx, sandbox_cfg_t *filter) if (param != NULL && param->prot == 1 && param->syscall == SCMP_SYS(open)) { - rc = seccomp_rule_add_1(ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), - SCMP_CMP_STR(0, SCMP_CMP_EQ, param->value)); + rc = allow_file_open(ctx, 0 /* XXXX */, param->value); if (rc != 0) { log_err(LD_BUG,"(Sandbox) failed to add open syscall, received " "libseccomp error %d", rc); @@ -456,6 +473,15 @@ sb_open(scmp_filter_ctx ctx, sandbox_cfg_t *filter) return rc; } + rc = seccomp_rule_add_1(ctx, SCMP_ACT_ERRNO(EACCES), SCMP_SYS(openat), + SCMP_CMP_MASKED(2, O_CLOEXEC|O_NONBLOCK|O_NOCTTY|O_NOFOLLOW, + O_RDONLY)); + if (rc != 0) { + log_err(LD_BUG,"(Sandbox) failed to add openat syscall, received " + "libseccomp error %d", rc); + return rc; + } + return 0; } @@ -645,7 +671,7 @@ sb_socket(scmp_filter_ctx ctx, sandbox_cfg_t *filter) rc = seccomp_rule_add_3(ctx, SCMP_ACT_ALLOW, SCMP_SYS(socket), SCMP_CMP(0, SCMP_CMP_EQ, PF_NETLINK), - SCMP_CMP(1, SCMP_CMP_EQ, SOCK_RAW), + SCMP_CMP_MASKED(1, SOCK_CLOEXEC, SOCK_RAW), SCMP_CMP(2, SCMP_CMP_EQ, 0)); if (rc) return rc; @@ -1616,7 +1642,8 @@ add_param_filter(scmp_filter_ctx ctx, sandbox_cfg_t* cfg) // function pointer for (i = 0; i < ARRAY_LENGTH(filter_func); i++) { - if ((filter_func[i])(ctx, cfg)) { + rc = filter_func[i](ctx, cfg); + if (rc) { log_err(LD_BUG,"(Sandbox) failed to add syscall %d, received libseccomp " "error %d", i, rc); return rc;

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[tor/release-0.3.1] Add a changes file.
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 80bf270404a52c634a14f6aad594dec4e9ce1e12 Author: Nick Mathewson <nickm(a)torproject.org> Date: Thu Nov 16 14:07:58 2017 -0500 Add a changes file. --- changes/ticket24315 | 3 +++ 1 file changed, 3 insertions(+) diff --git a/changes/ticket24315 b/changes/ticket24315 new file mode 100644 index 000000000..df34dbf41 --- /dev/null +++ b/changes/ticket24315 @@ -0,0 +1,3 @@ + o Major features (linux seccomp2 sandbox): + - Update the sandbox rules so that they should now work correctly with + Glibc 2.26. Closes ticket 24315.

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[tor/release-0.2.9] Merge branch 'maint-0.2.9' into release-0.2.9
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 27c30bc227b06bb43e170c454f8987f3a45b67cb Merge: da194bb49 848ba26c1 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Feb 11 18:09:35 2018 -0500 Merge branch 'maint-0.2.9' into release-0.2.9 changes/ticket24315 | 3 +++ configure.ac | 2 ++ src/common/sandbox.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 72 insertions(+), 4 deletions(-)

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[tor/release-0.3.1] Check the libc version to decide whether to allow openat.
by nickm＠torproject.org 11 Feb '18

11 Feb '18

1 0

[tor/release-0.3.1] Merge branch 'maint-0.2.9' into maint-0.3.1
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 8939eaf479bc123e774421c9de6dfc3c864e0326 Merge: eccef6ba6 848ba26c1 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Feb 11 18:09:35 2018 -0500 Merge branch 'maint-0.2.9' into maint-0.3.1 changes/ticket24315 | 3 +++ configure.ac | 2 ++ src/common/sandbox.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++--- 3 files changed, 72 insertions(+), 4 deletions(-)

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[tor/release-0.3.1] Merge branch 'ticket24315_029' into maint-0.2.9
by nickm＠torproject.org 11 Feb '18

11 Feb '18

1 0

[tor/release-0.3.2] Merge branch 'maint-0.3.2' into release-0.3.2
by nickm＠torproject.org 11 Feb '18

11 Feb '18

commit 2a24ce9656cc36283b615b0da9e64c16adf36374 Merge: 9e81221c9 67043d957 Author: Nick Mathewson <nickm(a)torproject.org> Date: Sun Feb 11 18:09:35 2018 -0500 Merge branch 'maint-0.3.2' into release-0.3.2

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[tor/release-0.3.2] Merge branch 'maint-0.2.9' into maint-0.3.1
by nickm＠torproject.org 11 Feb '18

11 Feb '18

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tor-commits February 2018