mpm-itk-2.4.7-04/0000755000175000017500000000000012660126526012357 5ustar sessesessempm-itk-2.4.7-04/m4/0000755000175000017500000000000012047753004012673 5ustar sessesessempm-itk-2.4.7-04/m4/ax_with_apxs.m40000644000175000017500000000347712047753005015647 0ustar sessesesse# =========================================================================== # http://www.gnu.org/software/autoconf-archive/ax_with_apxs.html # =========================================================================== # # SYNOPSIS # # AX_WITH_APXS([value-if-not-found], [path]) # # DESCRIPTION # # Locates an installed apxs binary, placing the result in the precious # variable $APXS. Accepts a preset $APXS, then --with-apxs, and failing # that searches for apxs in the given path (which defaults to the system # path). 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See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Portions copyright 2005-2013 Steinar H. Gunderson . * Licensed under the same terms as the rest of Apache. * * Portions copyright 2008 Knut Auvor Grythe . * Licensed under the same terms as the rest of Apache. */ /** * @file itk/mpm_default.h * @brief ITK MPM defaults * * @defgroup APACHE_MPM_ITK Apache ITK * @ingroup APACHE_INTERNAL * @{ */ #ifndef APACHE_MPM_DEFAULT_H #define APACHE_MPM_DEFAULT_H /* Number of servers to spawn off by default --- also, if fewer than * this free when the caretaker checks, it will spawn more. */ #ifndef DEFAULT_START_DAEMON #define DEFAULT_START_DAEMON 5 #endif /* Maximum number of *free* server processes --- more than this, and * they will die off. */ #ifndef DEFAULT_MAX_FREE_DAEMON #define DEFAULT_MAX_FREE_DAEMON 10 #endif /* Minimum --- fewer than this, and more will be created */ #ifndef DEFAULT_MIN_FREE_DAEMON #define DEFAULT_MIN_FREE_DAEMON 5 #endif #endif /* AP_MPM_DEFAULT_H */ /** @} */ mpm-itk-2.4.7-04/Makefile.in0000644000175000017500000000060412050041171014405 0ustar sessesesseAPXS=@APXS@ SRCS=mpm_itk.c seccomp.c HDRS=seccomp.h mpm_default.h LIBS=@LIBS@ mpm_itk.la: $(SRCS) $(HDRS) $(APXS) -c $(SRCS) $(LIBS) install: mpm_itk.la $(APXS) -i $< clean: $(RM) -r .libs $(RM) $(SRCS:.c=.o) $(SRCS:.c=.lo) $(SRCS:.c=.la) $(SRCS:.c=.slo) distclean: clean $(RM) -r autom4te.cache $(RM) Makefile config.log config.h config.status .PHONY: install clean distclean mpm-itk-2.4.7-04/seccomp.c0000644000175000017500000001725312304353710014154 0ustar sessesesse/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Portions copyright 2005-2013 Steinar H. Gunderson . * Licensed under the same terms as the rest of Apache. */ #include "ap_config.h" #include "httpd.h" #include "http_log.h" #include "http_main.h" #if defined(__linux__) && (defined(__i386__) || defined(__x86_64__)) #define SECCOMP_BPF_SUPPORTED 1 #include #include #include #include #include #include /* These definitions are from , which we do not include * because it is not very commonly installed yet. */ #define SECCOMP_RET_KILL 0x00000000U #define SECCOMP_RET_ERRNO 0x00050000U #define SECCOMP_RET_ALLOW 0x7fff0000U #define SECCOMP_MODE_FILTER 2 struct seccomp_data { int nr; __u32 arch; __u64 instruction_pointer; __u64 args[6]; }; #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n])) #define syscall_nr (offsetof(struct seccomp_data, nr)) #define arch_nr (offsetof(struct seccomp_data, arch)) /* Note that we assume little-endian in the BPF (we assume the first 32 bits of * the argument contain the lower 32 bits, whether we are on 32- or 64-bit). */ #if defined(__i386__) #define ARCH_NR AUDIT_ARCH_I386 #elif defined(__amd64__) #define ARCH_NR AUDIT_ARCH_X86_64 #endif #endif #if SECCOMP_BPF_SUPPORTED static int apply_seccomp_filter(struct sock_filter *filter, int len) { struct sock_fprog seccomp_prog = { .len = len, .filter = filter, }; if (prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &seccomp_prog) != 0) { ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf, "Installing seccomp filter failed (probably due to too old kernel); " "unable to restrict setuid privileges. Error was: %s", strerror(errno)); return 1; } else { return 0; } } static void add_bpf_stmt(struct sock_filter *filter, int *pos, __u16 code, __u32 k) { struct sock_filter stmt = BPF_STMT(code, k); filter[*pos] = stmt; ++*pos; } static void add_bpf_jump(struct sock_filter *filter, int *pos, __u16 code, __u32 k, __u8 jt, __u8 jf) { struct sock_filter stmt = BPF_JUMP(code, k, jt, jf); filter[*pos] = stmt; ++*pos; } static int limit_syscall_range(int syscall_to_match, int nr_args, __u32 min, __u32 max, __u32 or_eq) { static struct sock_filter syscall_filter[BPF_MAXINSNS]; int pos = 0; /* If we don't match the syscall number, return immediately. */ add_bpf_stmt(syscall_filter, &pos, BPF_LD + BPF_W + BPF_ABS, syscall_nr); add_bpf_jump(syscall_filter, &pos, BPF_JMP + BPF_JEQ + BPF_K, syscall_to_match, 1, 0); add_bpf_stmt(syscall_filter, &pos, BPF_RET + BPF_K, SECCOMP_RET_ALLOW); for (int i = 0; i < nr_args; ++i) { add_bpf_stmt(syscall_filter, &pos, BPF_LD + BPF_W + BPF_ABS, syscall_arg(i)); if (or_eq != 0) { add_bpf_jump(syscall_filter, &pos, BPF_JMP + BPF_JEQ + BPF_K, or_eq, 4, 0); } add_bpf_jump(syscall_filter, &pos, BPF_JMP + BPF_JGE + BPF_K, min, 1, 0); add_bpf_stmt(syscall_filter, &pos, BPF_RET + BPF_K, SECCOMP_RET_ERRNO | EPERM); add_bpf_jump(syscall_filter, &pos, BPF_JMP + BPF_JGT + BPF_K, max, 0, 1); add_bpf_stmt(syscall_filter, &pos, BPF_RET + BPF_K, SECCOMP_RET_ERRNO | EPERM); } add_bpf_stmt(syscall_filter, &pos, BPF_RET + BPF_K, SECCOMP_RET_ALLOW); return apply_seccomp_filter(syscall_filter, pos); } #endif void restrict_setuid_range(uid_t min_uid, uid_t max_uid, gid_t min_gid, gid_t max_gid) { #if SECCOMP_BPF_SUPPORTED uid_t min_uid16 = (min_uid > 65535) ? 65535 : min_uid; uid_t max_uid16 = (max_uid > 65535) ? 65535 : max_uid; gid_t min_gid16 = (min_gid > 65535) ? 65535 : min_gid; gid_t max_gid16 = (max_gid > 65535) ? 65535 : max_gid; uid_t minus_one = (uid_t) -1; #ifdef __i386__ __u16 minus_one16 = (__u16) -1; #endif // defined(__i386__) /* Apply a seccomp BPF to ourselves that disallows all setuid- and * setgid-like calls if the first argument is 0. The list of calls comes from * the descriptions of CAP_SETUID and CAP_SETGID in capabilities(7), although * CAP_SETGID is underdocumented. */ struct sock_filter arch_filter[] = { /* Validate that the syscall is of the right architecture, * so that an attacker cannot circumvent our syscall protection * by changing to a different personality. */ BPF_STMT(BPF_LD + BPF_W + BPF_ABS, arch_nr), BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ARCH_NR, 1, 0), BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_KILL), BPF_STMT(BPF_RET + BPF_K, SECCOMP_RET_ALLOW), }; if (apply_seccomp_filter(arch_filter, sizeof(arch_filter) / sizeof(arch_filter[0])) != 0) { return; } #ifdef __i386__ /* Newer, 32-bit uid_t/gid_t syscalls. */ limit_syscall_range(__NR_setfsuid32, 1, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setuid32, 1, min_uid, max_uid, 0); limit_syscall_range(__NR_setreuid32, 2, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setresuid32, 3, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setfsgid32, 1, min_gid, max_gid, minus_one); limit_syscall_range(__NR_setgid32, 1, min_gid, max_gid, 0); limit_syscall_range(__NR_setregid32, 2, min_gid, max_gid, minus_one); limit_syscall_range(__NR_setresgid32, 3, min_gid, max_gid, minus_one); /* Older 16-bit old_uid_t/old_gid_t syscalls. */ limit_syscall_range(__NR_setfsuid, 1, min_uid16, max_uid16, minus_one16); limit_syscall_range(__NR_setuid, 1, min_uid16, max_uid16, 0); limit_syscall_range(__NR_setreuid, 2, min_uid16, max_uid16, minus_one16); limit_syscall_range(__NR_setresuid, 3, min_uid16, max_uid16, minus_one16); limit_syscall_range(__NR_setfsgid, 1, min_gid16, max_gid16, minus_one16); limit_syscall_range(__NR_setgid, 1, min_gid16, max_gid16, 0); limit_syscall_range(__NR_setregid, 2, min_gid16, max_gid16, minus_one16); limit_syscall_range(__NR_setresgid, 3, min_gid16, max_gid16, minus_one16); #else // not defined(__i386__) /* Just one set of 32-bit uid_t/gid_t syscalls to worry about. */ limit_syscall_range(__NR_setfsuid, 1, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setuid, 1, min_uid, max_uid, 0); limit_syscall_range(__NR_setreuid, 2, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setresuid, 3, min_uid, max_uid, minus_one); limit_syscall_range(__NR_setfsgid, 1, min_gid, max_gid, minus_one); limit_syscall_range(__NR_setgid, 1, min_gid, max_gid, 0); limit_syscall_range(__NR_setregid, 2, min_gid, max_gid, minus_one); limit_syscall_range(__NR_setresgid, 3, min_gid, max_gid, minus_one); #endif #else ap_log_error(APLOG_MARK, APLOG_INFO, APR_SUCCESS, ap_server_conf, "Your platform or architecture does not support seccomp v2; " "unable to restrict setuid privileges."); #endif } mpm-itk-2.4.7-04/CHANGES0000644000175000017500000001732312660124163013353 0ustar sessesessempm-itk 2.4.7-04, released 2016-02-14: - Fix a compilation error on RHEL6; patch from Hans Kristian Rosbach. - Add a new flag EnableCapabilities (default on), which can be disabled to revert to the behavior in place before 2.4.2-02, which causes problems when the filesystem in use does not respect capabilities (in particular NFS). - Update copyright to 2016. mpm-itk 2.4.7-03, released 2015-09-09: - Fix an issue where connections would be attempted closed in the parent instead of in the child. This would result in "Connection: close" not being honored, and various odd effects with SSL keepalive in certain browsers. - Correct a log message on AssignGroupIDExpr failure; patch from Roland Mas. - Update copyright to 2015. mpm-itk 2.4.7-02, released 2014-03-01: - In the seccomp.c filter, allow -1 as value in certain system calls, as it means not to change the given value. Heavily based on patch from Jason Rhineland. - Update copyright to 2014. - Fix the minimum required version number in the README. mpm-itk 2.4.7-01, released 2013-11-26: - Note: This is almost identical to the previously released 2.4.6-01, which was later retracted since Apache 2.4.6 did not contain the required hook in question. - Changed the htaccess hook to the form that was eventually included in the Apache 2.4.7 release. This makes 2.4.7-01 the first version of mpm-itk that can compile against an entirely unpatched Apache from upstream, as Apache 2.4.7 includes all required patches for mpm-itk. - Deleted the now obsolete patches/ directory. - Updated copyright to 2013. mpm-itk 2.4.4-04, released 2013-02-28: - Make seccomp.c compile on 64-bit x86. Based on a bug report and patch from Hans Kristian Rosbach. - Fix a few compiler warnings, including a bug that could cause confusing behavior if fork() failed. Now failing fork() should reliably result in 500 Internal Server Error being sent. mpm-itk 2.4.4-03, released 2012-12-31: - Call ap_close_listeners() right after forking. This makes sure a runaway/rogue process cannot keep the server from restarting, or worse, call accept() on the listening socket. mpm-itk 2.4.4-02, released 2012-11-12: - Change from being an MPM to being a regular module, like mod_privileges is. This means we no longer need to duplicate large parts of prefork's functionality; instead, the user needs to run regular prefork and then load mpm-itk as a regular module. Note that the name is unchanged, to prevent (or maybe cause) further confusion. - Add a configure script (via autoconf), so that HAVE_LIBCAP is set if the system supports Linux capabilities. (2.2.4-01 always ran with libcap disabled.) - Remove a duplicate definition of the MaxClientsVhost directive (harmless, but stylistically bad). - Make the .htaccess check more efficient, by using access() instead of actually opening the file. - Actually use the post_perdir_config hook Apache has for us; seemingly it has been unused for a very long time (we hooked into header_parser instead, which is ever so slightly later, and does not run for subrequests). - Drop our extra privileges properly even if we have a vhost with default uid/gid; keeping them was probably not what the administrator intended. - Rewrite the MaxClientsVHost handling so that it properly takes into account the port the vhost is running on (unless the vhost name is very long). This matches Apache's existing scoreboard format, so we don't need to write into it ourselves anymore. mpm-itk 2.4.4-01, released 2012-11-11: - Build completely out-of-tree; thanks to Jeff Trawick for spearheading this on the Apache side. Note that this requires patches that are not in any Apache 2.4 release right now, so you will either need to apply the patches from the patches/ directory (that have been backported to 2.4.3, from Subversion) or build against httpd trunk. (It is hoped, but not guaranteed, that they will be part of the Apache 2.4.4 release.) Also, note that the performance will be ever so slightly lower than the in-tree versions, due to double statting of .htaccess files. I hope to fix this eventually. I've chosen to keep the version numbers consistent with the previous release, indicating that this release will probably go along with Apache 2.4.4, but assuming out-of-tree-builds will be the way forward in the 2.4 and newer series, Apache and mpm-itk version numbers will probably diverge in the future. - Add a version component ("mpm-itk/2.4.4-01") when the module is loaded, so maybe over time we can get a better idea of how widespread mpm-itk really is, and in what versions. apache2.4-mpm-itk 2.4.2-02, released 2012-08-05: - Take advantage of two new patches from upstream to simplify our code: First of all, our hook patch is now in Apache proper. Also, a new ap_stat() hook allows us to do the close-connection-on-EACCES handling with less patching into Apache itself (and in a future version, we hope to be able to build entirely out-of-tree). Note that since none of these patches are currently in a 2.4 release, we add them to the beginning of the patch series for now, with a “00_upstream” prefix. - If libcap is available, run as a normal user (the one specified in httpd.conf) with extra capabilities, instead of restricted root. Note that this does not really help a lot unless seccomp v2 is available (see next point), as the process can still call setuid(0) and then read or write files owned by root. - If seccomp v2 is available (Linux 3.5.0 or newer), restrict setuid() and setgid() calls (as well as seteuid() etc.), limiting their range. By default, only 0 is excluded, but the administrator can set a custom range with the LimitUIDRange and/or LimitGIDRange directives (e.g. "LimitUIDRange 1000 2000" to allow only uids from 1000 to 2000, inclusive). Note due to technical reasons, setgroups() is _not_ restricted, so a rogue or runaway process can still get add any group, including the root group, as supplementary. apache2.4-mpm-itk 2.4.2-01, released 2012-07-20: - The patch is now against Apache 2.4.2 instead of Apache 2.4.1. Note that even though the patch set will probably _apply_ to 2.4.1, it will not _work_ properly, due to a missing bugfix that is no longer in the patch set. - Support dynamic uid and gid selection through Apache 2.4's new generic expression syntax. For instance, you can now use mod_rewrite to do something like this: RewriteEngine on RewriteRule /~([a-z]+)/ - [E=ITKUID:$1] AssignUserIDExpr %{reqenv:ITKUID} which will cause e.g. /~sesse/foo to be run as the user “sesse”. Obviously, you will need to exercise caution here to avoid opening up new security holes. - Fix another case where we should drop the connection instead of returning 403; this time related to FollowSymLinks and directory traversal. Bug report and patch by Anton Statutov. - We now do clean_child_exit() instead of exit() after the request; this runs pool cleanup hooks, fixing an issue with mod_qos (reported by Daniele Orlandi). Note that this does not work properly in the case where we hard-close connections due to uid switch, so the fix is incomplete. - Fixed a typo in a comment in itk.c, and removed some stray trailing whitespace. - Added CHANGES file for the 2.4 series. apache2.2-mpm-itk 2.4.1-pre01, released 2012-04-01: - Backport the bug fix for bug 52904 from upstream, instead of reverting the entire commit that caused it. - Fix so AssignUserID can not be given in .htaccess files. apache2.2-mpm-itk 2.4.1-pre00, released 2012-03-14: - First port of mpm-itk to Apache 2.4. mpm-itk-2.4.7-04/mpm_itk.c0000644000175000017500000006151112660126526014167 0ustar sessesesse/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Portions copyright 2005-2016 Steinar H. Gunderson . * Licensed under the same terms as the rest of Apache. * * Portions copyright 2008 Knut Auvor Grythe . * Licensed under the same terms as the rest of Apache. */ #define MPMITK_VERSION "2.4.7-04" #include "config.h" #include "apr.h" #include "apr_portable.h" #include "apr_strings.h" #include "apr_thread_proc.h" #include "apr_signal.h" # define _DBG(text,par...) \ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \ "(itkmpm: pid=%d uid=%d, gid=%d) %s(): " text, \ getpid(), getuid(), getgid(), __FUNCTION__, par) #define APR_WANT_STDIO #define APR_WANT_STRFUNC #include "apr_want.h" #if APR_HAVE_UNISTD_H #include #endif #if APR_HAVE_SYS_TYPES_H #include #endif #include #include #include "ap_config.h" #include "httpd.h" #include "http_main.h" #include "http_log.h" #include "http_config.h" #include "http_core.h" /* for get_remote_host */ #include "http_connection.h" #include "http_request.h" #include "scoreboard.h" #include "ap_mpm.h" #include "util_mutex.h" #include "mpm_common.h" #include "unixd.h" #include "ap_listen.h" #include "ap_mmn.h" #include "apr_poll.h" #include "ap_expr.h" #include "seccomp.h" #ifdef HAVE_TIME_H #include #endif #ifdef HAVE_SYS_PROCESSOR_H #include /* for bindprocessor() */ #endif #include #include #if HAVE_LIBCAP #include #include #endif /* config globals */ static uid_t ap_itk_min_uid=1; static uid_t ap_itk_max_uid=UINT_MAX; static gid_t ap_itk_min_gid=1; static gid_t ap_itk_max_gid=UINT_MAX; #if HAVE_LIBCAP static int ap_itk_enable_caps=1; #endif module AP_MODULE_DECLARE_DATA mpm_itk_module; #define UNSET_NICE_VALUE 100 typedef struct { uid_t uid; gid_t gid; char *username; int nice_value; ap_expr_info_t *uid_expr; ap_expr_info_t *gid_expr; } itk_per_dir_conf; typedef struct { int max_clients_vhost; } itk_server_conf; AP_DECLARE_DATA int ap_has_irreversibly_setuid = 0; /* Only in use if not enabling capabilities. */ AP_DECLARE_DATA uid_t saved_unixd_uid = -1; AP_DECLARE_DATA gid_t saved_unixd_gid = -1; static int itk_pre_drop_privileges(apr_pool_t *pool, server_rec *s) { #if HAVE_LIBCAP if (ap_itk_enable_caps) { /* mod_unixd will drop down to a normal user. This means that even if an * attacker manage to execute code before setuid(), he/she cannot write to * files owned by uid 0, such as /etc/crontab. We'll need to keep our extra * privileges, though, since we need them for the actual query processing * later, so specify that we'll keep them across the setuid that is soon to * come. * * Note that since we still have CAP_SETUID, an attacker can setuid(0) * and get around this. Thus, we disallow setuid(0) if the platform * allows it. */ restrict_setuid_range(ap_itk_min_uid, ap_itk_max_uid, ap_itk_min_gid, ap_itk_max_gid); if (prctl(PR_SET_KEEPCAPS, 1)) { ap_log_error(APLOG_MARK, APLOG_EMERG, errno, NULL, "prctl(PR_SET_KEEPCAPS, 1) failed"); exit(APEXIT_CHILDFATAL); } return OK; } #endif restrict_setuid_range(ap_itk_min_uid, ap_itk_max_uid, ap_itk_min_gid, ap_itk_max_gid); /* Fiddle with mod_unixd's structures so that it doesn't drop uid 0; * we need that, since we don't have capabilities. */ saved_unixd_uid = ap_unixd_config.user_id; saved_unixd_gid = ap_unixd_config.group_id; ap_unixd_config.user_id = 0; ap_unixd_config.group_id = 0; return OK; } static int itk_post_drop_privileges(apr_pool_t *pool, server_rec *s) { #if HAVE_LIBCAP if (ap_itk_enable_caps) { cap_t caps; cap_value_t suidcaps[] = { CAP_SETUID, CAP_SETGID, CAP_DAC_READ_SEARCH, CAP_SYS_NICE, }; /* We don't need to keep capabilities across setuid anymore, so stop that. */ if (prctl(PR_SET_KEEPCAPS, 0)) { ap_log_error(APLOG_MARK, APLOG_EMERG, errno, NULL, "prctl(PR_SET_KEEPCAPS, 0) failed"); exit(APEXIT_CHILDFATAL); } /* Now drop as many privileges as we can. We'll still * access files with uid=0, and we can setuid() to anything, but * at least there's tons of other evilness (like loading kernel * modules) we can't do directly. (The setuid() capability will * go away automatically when we setuid() or exec() -- the former * is likely to come first.) */ caps = cap_init(); cap_clear(caps); cap_set_flag(caps, CAP_PERMITTED, sizeof(suidcaps)/sizeof(cap_value_t), suidcaps, CAP_SET); cap_set_flag(caps, CAP_EFFECTIVE, sizeof(suidcaps)/sizeof(cap_value_t), suidcaps, CAP_SET); cap_set_proc(caps); cap_free(caps); return OK; } #endif // Restore the configured unixd uid/gid. ap_unixd_config.user_id = saved_unixd_uid; ap_unixd_config.group_id = saved_unixd_gid; return OK; } static int have_forked = 0; int itk_fork_process(conn_rec *c) { if (have_forked) { return DECLINED; } pid_t pid = fork(), child_pid; int status; switch (pid) { case -1: ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "fork: Unable to fork new process"); return HTTP_INTERNAL_SERVER_ERROR; case 0: /* Child; runs processing as usual, then dies. * This is a bit tricky in that we need to run ap_run_process_connection() * even though we are a process_connection hook ourselves! That is the only * way we can exit cleanly after the hook is done. Thus, we set have_forked * to signal that we don't want to end up in infinite recursion. */ have_forked = 1; ap_close_listeners(); ap_run_process_connection(c); ap_lingering_close(c); exit(0); default: /* parent; just wait for child to be done */ do { child_pid = waitpid(pid, &status, 0); } while (child_pid == -1 && errno == EINTR); if (child_pid != pid || !WIFEXITED(status)) { if (WIFSIGNALED(status)) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child died with signal %u", WTERMSIG(status)); } else if (WEXITSTATUS(status) != 0) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, "child exited with non-zero exit status %u", WEXITSTATUS(status)); } else { ap_log_error(APLOG_MARK, APLOG_ERR, errno, NULL, "waitpid() failed"); } exit(1); } /* * It is important that ap_lingering_close() is called in the child * and not here, since some modules (like mod_ssl) needs to know the state * from earlier in the connection to be able to finish correctly. * However, we close the socket itself here so that we don't keep a * reference to it around, and then set the socket pointer to NULL so * that when prefork tries to close it, it goes into early exit. */ apr_socket_close(ap_get_conn_socket(c)); ap_set_core_module_config(c->conn_config, NULL); /* make sure the MPM does not process this connection */ return OK; } } static int itk_init_handler(apr_pool_t *p, apr_pool_t *plog, apr_pool_t *ptemp, server_rec *s) { int threaded; int ret = ap_mpm_query(AP_MPMQ_IS_THREADED, &threaded) != APR_SUCCESS; if (ret != APR_SUCCESS || threaded) { ap_log_perror(APLOG_MARK, APLOG_CRIT, ret, ptemp, "mpm-itk cannot use threaded MPMs; please use prefork."); return HTTP_INTERNAL_SERVER_ERROR; } ap_add_version_component(p, "mpm-itk/" MPMITK_VERSION); return OK; } static int itk_post_perdir_config(request_rec *r) { uid_t wanted_uid; gid_t wanted_gid; const char *wanted_username; int err = 0; itk_server_conf *sconf = (itk_server_conf *) ap_get_module_config(r->server->module_config, &mpm_itk_module); itk_per_dir_conf *dconf; /* Enforce MaxClientsVhost. */ if (sconf->max_clients_vhost > 0) { worker_score *ws; char my_vhost[sizeof(ws->vhost)]; apr_snprintf(my_vhost, sizeof(my_vhost), "%s:%d", r->server->server_hostname, r->connection->local_addr->port); int daemons_limit; ap_mpm_query(AP_MPMQ_HARD_LIMIT_DAEMONS, &daemons_limit); int i, num_other_servers = 0; for (i = 0; i < daemons_limit; ++i) { worker_score *ws = ap_get_scoreboard_worker_from_indexes(i, 0); if (ws->status >= SERVER_BUSY_READ && strcmp(ws->vhost, my_vhost) == 0) ++num_other_servers; } if (num_other_servers > sconf->max_clients_vhost) { ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \ "MaxClientsVhost reached for %s, refusing client.", my_vhost); return HTTP_SERVICE_UNAVAILABLE; } } dconf = (itk_per_dir_conf *) ap_get_module_config(r->per_dir_config, &mpm_itk_module); if (dconf->nice_value != UNSET_NICE_VALUE && setpriority(PRIO_PROCESS, 0, dconf->nice_value)) { _DBG("setpriority(): %s", strerror(errno)); err = 1; } wanted_uid = dconf->uid; wanted_gid = dconf->gid; wanted_username = dconf->username; if (wanted_uid == -1 || wanted_gid == -1) { wanted_uid = ap_unixd_config.user_id; wanted_gid = ap_unixd_config.group_id; wanted_username = ap_unixd_config.user_name; } /* AssignUserIDExpr and AssignGroupIDExpr override AssignUserID and defaults. */ if (dconf->uid_expr != NULL) { struct passwd *ent; const char *err; wanted_username = ap_expr_str_exec(r, dconf->uid_expr, &err); if (err) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \ "Error while parsing AssignUserIDExpr expression: %s", err); return HTTP_INTERNAL_SERVER_ERROR; } if (!(ent = getpwnam(wanted_username))) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \ "AssignUserIDExpr returned '%s', which is not a valid user name", wanted_username); return HTTP_INTERNAL_SERVER_ERROR; } wanted_uid = ent->pw_uid; } if (dconf->gid_expr != NULL) { struct group *ent; const char *err; const char *wanted_groupname = ap_expr_str_exec(r, dconf->gid_expr, &err); if (err) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \ "Error while parsing AssignGroupIDExpr expression: %s", err); return HTTP_INTERNAL_SERVER_ERROR; } if (!(ent = getgrnam(wanted_groupname))) { ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, \ "AssignGroupIDExpr returned '%s', which is not a valid group name", wanted_groupname); return HTTP_INTERNAL_SERVER_ERROR; } wanted_gid = ent->gr_gid; } /* setuid() at least on the first request, but from there only if we need to change anything. * (Those requests will almost certainly fail.) */ if ((!err && !ap_has_irreversibly_setuid) || wanted_uid != getuid() || wanted_gid != getgid()) { if (setgid(wanted_gid)) { _DBG("setgid(%d): %s", wanted_gid, strerror(errno)); if (wanted_gid < ap_itk_min_gid || wanted_gid > ap_itk_max_gid) { ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, NULL, "This is most likely due to the current LimitGIDRange setting."); } err = 1; } else if (initgroups(wanted_username, wanted_gid)) { _DBG("initgroups(%s, %d): %s", wanted_username, wanted_gid, strerror(errno)); err = 1; } else if (setuid(wanted_uid)) { _DBG("setuid(%d): %s", wanted_uid, strerror(errno)); if (wanted_uid < ap_itk_min_uid || wanted_uid > ap_itk_max_uid) { ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, NULL, "This is most likely due to the current LimitUIDRange setting."); } err = 1; } else { #if HAVE_LIBCAP if (ap_itk_enable_caps) { /* Drop our remaining privileges. Normally setuid() would do this * for us, but since we were previously not uid 0 (just a normal * user with CAP_SETUID), we need to do it ourselves. */ cap_t caps; caps = cap_init(); cap_clear(caps); cap_set_proc(caps); cap_free(caps); } #endif ap_has_irreversibly_setuid = 1; } } if (err) { if (ap_has_irreversibly_setuid) { /* Most likely a case of switching uid/gid within a persistent * connection; the RFCs allow us to just close the connection * at anytime, so we excercise our right. :-) */ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, NULL, \ "Couldn't set uid/gid/priority, closing connection."); ap_lingering_close(r->connection); exit(0); } else { /* Something went wrong even this is the first request. * We need to notify the user. */ return HTTP_INTERNAL_SERVER_ERROR; } } return OK; } /* * If we are in a persistent connection, we might end up in a state * where we can no longer read .htaccess files because we have already * setuid(). This can either be because the previous request was for * another vhost (basically the same problem as when setuid() fails in * itk.c), or it can be because a .htaccess file is readable only by * root. * * In any case, we don't want to give out a 403, since the request has * a very real chance of succeeding on a fresh connection (where * presumably uid=0). Thus, we give up serving the request on this * TCP connection, and do a hard close of the socket. As long as we're * in a persistent connection (and there _should_ not be a way this * would happen on the first request in a connection, save for subrequests, * which we special-case), this is allowed, as it is what happens on * a timeout. The browser will simply open a new connection and try * again (there's of course a performance hit, though, both due to * the new connection setup and the fork() of a new server child). */ static apr_status_t itk_dirwalk_stat(apr_finfo_t *finfo, request_rec *r, apr_int32_t wanted) { apr_status_t status = apr_stat(finfo, r->filename, wanted, r->pool); if (ap_has_irreversibly_setuid && r->main == NULL && APR_STATUS_IS_EACCES(status)) { ap_log_rerror(APLOG_MARK, APLOG_WARNING, status, r, "Couldn't read %s, closing connection.", r->filename); ap_lingering_close(r->connection); exit(0); } return status; } /* See itk_dirwalk_stat() for rationale. */ static apr_status_t itk_open_htaccess(request_rec *r, const char *dir_name, const char *access_name, ap_configfile_t **conffile, const char **full_name) { int status; if (!ap_has_irreversibly_setuid || r->main != NULL) { return AP_DECLINED; } *full_name = ap_make_full_path(r->pool, dir_name, access_name); status = ap_pcfg_openfile(conffile, r->pool, *full_name); if (APR_STATUS_IS_EACCES(status)) { ap_log_rerror(APLOG_MARK, APLOG_WARNING, errno, r, "Couldn't read %s, closing connection.", *full_name); ap_lingering_close(r->connection); exit(0); } return status; } static void itk_hooks(apr_pool_t *p) { /* add our version component on init, and check that we are under prefork */ ap_hook_post_config(itk_init_handler, NULL, NULL, APR_HOOK_MIDDLE); /* we need to hook into the privilege dropping both before and after mod_unixd */ ap_hook_drop_privileges(itk_pre_drop_privileges, NULL, NULL, APR_HOOK_FIRST); ap_hook_drop_privileges(itk_post_drop_privileges, NULL, NULL, APR_HOOK_LAST); /* fork just before ap_run_create_connection() is called */ ap_hook_process_connection(itk_fork_process, NULL, NULL, APR_HOOK_REALLY_FIRST); /* set the uid as fast as possible, but not before merging per-dir config */ ap_hook_post_perdir_config(itk_post_perdir_config, NULL, NULL, APR_HOOK_REALLY_FIRST); /* replace core_dirwalk_stat so that we can kill the connection on stat() failure */ ap_hook_dirwalk_stat(itk_dirwalk_stat, NULL, NULL, APR_HOOK_MIDDLE); /* hook htaccess check so we can kill the connection on .htaccess open() failure */ ap_hook_open_htaccess(itk_open_htaccess, NULL, NULL, APR_HOOK_REALLY_FIRST); } static const char *assign_user_id (cmd_parms *cmd, void *ptr, const char *user_name, const char *group_name) { itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr; const char *err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS); if (err) { return err; } dconf->username = apr_pstrdup(cmd->pool, user_name); dconf->uid = ap_uname2id(user_name); dconf->gid = ap_gname2id(group_name); return NULL; } static const char *limit_uid_range(cmd_parms *cmd, void *dummy, const char *min_arg, const char *max_arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_itk_min_uid = atoi(min_arg); ap_itk_max_uid = atoi(max_arg); return NULL; } static const char *limit_gid_range(cmd_parms *cmd, void *dummy, const char *min_arg, const char *max_arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_itk_min_gid = atoi(min_arg); ap_itk_max_gid = atoi(max_arg); return NULL; } #if HAVE_LIBCAP static const char *enable_caps(cmd_parms *cmd, void *dummy, int arg) { const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY); if (err != NULL) { return err; } ap_itk_enable_caps = arg; return NULL; } #endif static const char *assign_user_id_expr (cmd_parms *cmd, void *ptr, const char *user_name_expr) { itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr; const char *err; err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS); if (err) { return err; } dconf->uid_expr = ap_expr_parse_cmd_mi(cmd, user_name_expr, AP_EXPR_FLAG_STRING_RESULT, &err, NULL, AP_CORE_MODULE_INDEX); if (err) { return err; } return NULL; } static const char *assign_group_id_expr (cmd_parms *cmd, void *ptr, const char *group_name_expr) { itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr; const char *err; err = ap_check_cmd_context(cmd, NOT_IN_HTACCESS); if (err) { return err; } dconf->gid_expr = ap_expr_parse_cmd_mi(cmd, group_name_expr, AP_EXPR_FLAG_STRING_RESULT, &err, NULL, AP_CORE_MODULE_INDEX); if (err) { return err; } return NULL; } static const char *set_max_clients_vhost (cmd_parms *cmd, void *dummy, const char *arg) { itk_server_conf *sconf = (itk_server_conf *) ap_get_module_config(cmd->server->module_config, &mpm_itk_module); sconf->max_clients_vhost = atoi(arg); return NULL; } static const char *set_nice_value (cmd_parms *cmd, void *ptr, const char *arg) { itk_per_dir_conf *dconf = (itk_per_dir_conf *) ptr; int nice_value = atoi(arg); if (nice_value < -20) { ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "WARNING: NiceValue of %d is below -20, increasing NiceValue to -20.", nice_value); nice_value = -20; } else if (nice_value > 19) { ap_log_error(APLOG_MARK, APLOG_STARTUP, 0, NULL, "WARNING: NiceValue of %d is above 19, lowering NiceValue to 19.", nice_value); nice_value = 19; } dconf->nice_value = nice_value; return NULL; } static const command_rec itk_cmds[] = { AP_INIT_TAKE2("AssignUserID", assign_user_id, NULL, RSRC_CONF|ACCESS_CONF, "Tie a virtual host to a specific child process."), AP_INIT_RAW_ARGS("AssignUserIDExpr", assign_user_id_expr, NULL, RSRC_CONF|ACCESS_CONF, "Choose user ID given an expression. Will override AssignUserID."), AP_INIT_RAW_ARGS("AssignGroupIDExpr", assign_group_id_expr, NULL, RSRC_CONF|ACCESS_CONF, "Choose group ID given an expression. Will override AssignUserID."), AP_INIT_TAKE2("LimitUIDRange", limit_uid_range, NULL, RSRC_CONF, "If seccomp v2 is available (Linux 3.5.0+), limit the process's possible " "uid to the given range (inclusive endpoints)"), AP_INIT_TAKE2("LimitGIDRange", limit_gid_range, NULL, RSRC_CONF, "If seccomp v2 is available (Linux 3.5.0+), limit the process's possible " "primary gid to the given range (inclusive endpoints). " "Note that this does not restrict supplemental gids!"), #if HAVE_LIBCAP AP_INIT_FLAG("EnableCapabilities", enable_caps, NULL, RSRC_CONF, "Drop most root capabilities in the parent process, and instead run as " "the user given by the User/Group directives with some extra capabilities " "(in particular setuid). Somewhat more secure, but can cause problems " "when serving from NFS."), #endif AP_INIT_TAKE1("MaxClientsVHost", set_max_clients_vhost, NULL, RSRC_CONF, "Maximum number of children alive at the same time for this virtual host."), AP_INIT_TAKE1("NiceValue", set_nice_value, NULL, RSRC_CONF|ACCESS_CONF, "Set nice value for the given vhost, from -20 (highest priority) to 19 (lowest priority)."), { NULL } }; /* == allocate a private per-dir config structure == */ static void *itk_create_dir_config(apr_pool_t *p, char *dummy) { itk_per_dir_conf *c = (itk_per_dir_conf *) apr_pcalloc(p, sizeof(itk_per_dir_conf)); c->uid = c->gid = -1; c->uid_expr = c->gid_expr = NULL; c->nice_value = UNSET_NICE_VALUE; return c; } /* == merge the parent per-dir config structure into ours == */ static void *itk_merge_dir_config(apr_pool_t *p, void *parent_ptr, void *child_ptr) { itk_per_dir_conf *c = (itk_per_dir_conf *) itk_create_dir_config(p, NULL); itk_per_dir_conf *parent = (itk_per_dir_conf *) parent_ptr; itk_per_dir_conf *child = (itk_per_dir_conf *) child_ptr; if (child->username != NULL) { c->username = child->username; c->uid = child->uid; c->gid = child->gid; } else { c->username = parent->username; c->uid = parent->uid; c->gid = parent->gid; } if (child->uid_expr != NULL) { c->uid_expr = child->uid_expr; } else { c->uid_expr = parent->uid_expr; } if (child->gid_expr != NULL) { c->gid_expr = child->gid_expr; } else { c->gid_expr = parent->gid_expr; } if (child->nice_value != UNSET_NICE_VALUE) { c->nice_value = child->nice_value; } else { c->nice_value = parent->nice_value; } return c; } /* == allocate a private server config structure == */ static void *itk_create_server_config(apr_pool_t *p, server_rec *s) { itk_server_conf *c = (itk_server_conf *) apr_pcalloc(p, sizeof(itk_server_conf)); c->max_clients_vhost = -1; return c; } AP_DECLARE_MODULE(mpm_itk) = { STANDARD20_MODULE_STUFF, itk_create_dir_config, /* create per-directory config structure */ itk_merge_dir_config, /* merge per-directory config structures */ itk_create_server_config, /* create per-server config structure */ NULL, /* merge per-server config structures */ itk_cmds, /* command apr_table_t */ itk_hooks, /* register hooks */ }; mpm-itk-2.4.7-04/configure.ac0000644000175000017500000000026512660124332014641 0ustar sessesessem4_include([m4/ax_with_apxs.m4]) AC_INIT([mpm-itk], [2.4.7-04]) AC_PROG_CC AC_CHECK_LIB(cap, cap_init) AX_WITH_APXS([missing]) AC_CONFIG_HEADERS([config.h]) AC_OUTPUT([Makefile]) mpm-itk-2.4.7-04/seccomp.h0000644000175000017500000000240312167241767014167 0ustar sessesesse/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * * Portions copyright 2005-2013 Steinar H. Gunderson . * Licensed under the same terms as the rest of Apache. */ /** * @file itk/seccomp.h * @brief Utility functions for seccomp support * * @defgroup APACHE_MPM_ITK Apache ITK * @ingroup APACHE_INTERNAL * @{ */ #ifndef APACHE_MPM_SECCOMP_H #define APACHE_MPM_SECCOMP_H void restrict_setuid_range(uid_t min_uid, uid_t max_uid, gid_t min_gid, gid_t max_gid); #endif /* AP_MPM_SECCOMP_H */ /** @} */ mpm-itk-2.4.7-04/README0000644000175000017500000000137612304353235013240 0ustar sessesesseThis is a prerelease version of mpm-itk for Apache 2.4.7 or newer. 2.4.6 or before will not work; for 2.2.x, there's an entirely different patch set (see http://mpm-itk.sesse.net/). It is much less tested than the 2.2.x series, so exercise caution; however, several organizations do run it in production. Follow the mpm-itk mailing list (http://lists.err.no/mailman/listinfo/mpm-itk) for more information as it becomes available. To build, simply run configure and then make; you may have to adjust the apxs path, e.g. ./configure --with-apxs=apxs2 or ./configure --with-apxs=/usr/local/apache2/bin/apxs Similarly, make install (as root) will install the module, after which you can add LoadModule mpm_itk_module modules/mpm_itk.so to your httpd.conf.