├── .dir-locals.el ├── .gitignore ├── INSTALL ├── LICENSE ├── Makefile.am ├── README.md ├── configure.ac ├── doc └── oci-systemd-hook.1.md ├── oci-systemd-hook.json ├── oci-systemd-hook.spec └── src └── systemdhook.c /.dir-locals.el: -------------------------------------------------------------------------------- 1 | ((c-mode . ((indent-tabs-mode . t) (c-file-style . "linux")))) 2 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | .dirstamp 2 | Makefile.in 3 | Makefile 4 | aclocal.m4 5 | autom4te.cache/ 6 | config.log 7 | config.status 8 | configure 9 | oci-systemd-hook 10 | oci-systemd-hook.1 11 | .deps/ 12 | systemdhook.o 13 | oci_systemd_hook-systemdhook.o 14 | build-aux/ 15 | config.h 16 | config.h.in 17 | stamp-* 18 | *.gz 19 | -------------------------------------------------------------------------------- /INSTALL: -------------------------------------------------------------------------------- 1 | Installation Instructions 2 | ************************* 3 | 4 | Copyright (C) 1994-1996, 1999-2002, 2004-2013 Free Software Foundation, 5 | Inc. 6 | 7 | Copying and distribution of this file, with or without modification, 8 | are permitted in any medium without royalty provided the copyright 9 | notice and this notice are preserved. This file is offered as-is, 10 | without warranty of any kind. 11 | 12 | Basic Installation 13 | ================== 14 | 15 | Briefly, the shell command `./configure && make && make install' 16 | should configure, build, and install this package. The following 17 | more-detailed instructions are generic; see the `README' file for 18 | instructions specific to this package. Some packages provide this 19 | `INSTALL' file but do not implement all of the features documented 20 | below. The lack of an optional feature in a given package is not 21 | necessarily a bug. More recommendations for GNU packages can be found 22 | in *note Makefile Conventions: (standards)Makefile Conventions. 23 | 24 | The `configure' shell script attempts to guess correct values for 25 | various system-dependent variables used during compilation. 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This 246 | directory contains several dysfunctional programs; working variants of 247 | these programs are available in `/usr/bin'. So, if you need `/usr/ucb' 248 | in your `PATH', put it _after_ `/usr/bin'. 249 | 250 | On Haiku, software installed for all users goes in `/boot/common', 251 | not `/usr/local'. It is recommended to use the following options: 252 | 253 | ./configure --prefix=/boot/common 254 | 255 | Specifying the System Type 256 | ========================== 257 | 258 | There may be some features `configure' cannot figure out 259 | automatically, but needs to determine by the type of machine the package 260 | will run on. Usually, assuming the package is built to be run on the 261 | _same_ architectures, `configure' can figure that out, but if it prints 262 | a message saying it cannot guess the machine type, give it the 263 | `--build=TYPE' option. TYPE can either be a short name for the system 264 | type, such as `sun4', or a canonical name which has the form: 265 | 266 | CPU-COMPANY-SYSTEM 267 | 268 | where SYSTEM can have one of these forms: 269 | 270 | OS 271 | KERNEL-OS 272 | 273 | See the file `config.sub' for the possible values of each field. 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Or, you can set the 294 | `CONFIG_SITE' environment variable to the location of the site script. 295 | A warning: not all `configure' scripts look for a site script. 296 | 297 | Defining Variables 298 | ================== 299 | 300 | Variables not defined in a site shell script can be set in the 301 | environment passed to `configure'. However, some packages may run 302 | configure again during the build, and the customized values of these 303 | variables may be lost. In order to avoid this problem, you should set 304 | them in the `configure' command line, using `VAR=value'. For example: 305 | 306 | ./configure CC=/usr/local2/bin/gcc 307 | 308 | causes the specified `gcc' to be used as the C compiler (unless it is 309 | overridden in the site shell script). 310 | 311 | Unfortunately, this technique does not work for `CONFIG_SHELL' due to 312 | an Autoconf limitation. Until the limitation is lifted, you can use 313 | this workaround: 314 | 315 | CONFIG_SHELL=/bin/bash ./configure CONFIG_SHELL=/bin/bash 316 | 317 | `configure' Invocation 318 | ====================== 319 | 320 | `configure' recognizes the following options to control how it 321 | operates. 322 | 323 | `--help' 324 | `-h' 325 | Print a summary of all of the options to `configure', and exit. 326 | 327 | `--help=short' 328 | `--help=recursive' 329 | Print a summary of the options unique to this package's 330 | `configure', and exit. The `short' variant lists options used 331 | only in the top level, while the `recursive' variant lists options 332 | also present in any nested packages. 333 | 334 | `--version' 335 | `-V' 336 | Print the version of Autoconf used to generate the `configure' 337 | script, and exit. 338 | 339 | `--cache-file=FILE' 340 | Enable the cache: use and save the results of the tests in FILE, 341 | traditionally `config.cache'. 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Run 370 | `configure --help' for more details. 371 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. By contrast, 15 | the GNU General Public License is intended to guarantee your freedom to 16 | share and change all versions of a program--to make sure it remains free 17 | software for all its users. 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But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile.am: -------------------------------------------------------------------------------- 1 | libexec_PROGRAMS = oci-systemd-hook 2 | oci_systemd_hook_SOURCES= src/systemdhook.c 3 | 4 | oci_systemd_hook_CFLAGS = -Wall -Wextra -std=c99 $(YAJL_CFLAGS) 5 | oci_systemd_hook_LDADD = $(YAJL_LIBS) 6 | oci_systemd_hook_CFLAGS += $(SELINUX_CFLAGS) 7 | oci_systemd_hook_LDADD += $(SELINUX_LIBS) 8 | oci_systemd_hook_CFLAGS += $(LIBMOUNT_CFLAGS) 9 | oci_systemd_hook_LDADD += $(LIBMOUNT_LIBS) 10 | 11 | oci_systemd_hook_json_DATA = oci-systemd-hook.json 12 | oci_systemd_hook_jsondir=/usr/share/containers/oci/hooks.d 13 | 14 | dist_man_MANS = oci-systemd-hook.1 15 | EXTRA_DIST = README.md LICENSE 16 | 17 | oci-systemd-hook.1: doc/oci-systemd-hook.1.md 18 | go-md2man -in doc/oci-systemd-hook.1.md -out oci-systemd-hook.1 19 | 20 | distrib: oci-systemd-hook.spec 21 | spectool -g oci-systemd-hook.spec 22 | 23 | rpm: distrib 24 | rpmbuild --define "_sourcedir `pwd`" --define "_specdir `pwd`" \ 25 | --define "_rpmdir `pwd`" --define "_srcrpmdir `pwd`" -ba oci-systemd-hook.spec 26 | 27 | install-data-local: 28 | $(MKDIR_P) $(DESTDIR)$(oci_systemd_hook_jsondir) 29 | clean-local: 30 | -rm -f oci-systemd-hook.1 *~ 31 | -rm -f oci-systemd-hook-*.tar.gz 32 | -rm -f oci-systemd-hook-*.rpm 33 | 34 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # OCI systemd hooks 2 | 3 | OCI systemd hook enables users to run systemd in docker and [OCI][] compatible runtimes such as runc without requiring `--privileged` flag. 4 | 5 | This project produces a C binary that can be used with runc and Docker (with minor code changes). 6 | If you clone this branch and build/install `oci-systemd-hook`, a binary should be placed in 7 | `/usr/libexec/oci/hooks.d` named `oci-systemd-hook`. 8 | 9 | Running Docker or OCI runc containers with this executable, oci-systemd-hook is called just before a container is started and after it is provisioned. If the CMD to run inside of the container is `init` or `systemd`, this hook will configure the container image to run a systemd environment. For all other CMD's, this hook will just exit. 10 | 11 | When oci-systemd-hook detects systemd inside of the container it does the following: 12 | 13 | * Mounts a tmpfs on /run and /tmp 14 | - If there is content in the container image's /run and /tmp that content will be copied onto the tmpfs. 15 | * Creates a /etc/machine-id based on the the container's UUID 16 | * Mounts the hosts /sys/fs/cgroups file systemd read-only into the container 17 | - /sys/fs/cgroup/systemd will be mounted read/write into the container. 18 | 19 | When the container stops, these file systems will be umounted. 20 | 21 | systemd is expected to be able to run within the container without requiring 22 | the `--privileged` option. However you will still need to specify a special `--stop-signal`. Standard docker containers sends SIGTERM to pid 1, but systemd 23 | does not shut down properly when it recieves a SIGTERM. systemd specified that it needs to receive a RTMIN+3 signal to shutdown properly. 24 | 25 | 26 | **Usage** 27 | 28 | If you created a container image based on a Dockerfile like the following: 29 | ``` 30 | cat Dockerfile 31 | FROM fedora:latest 32 | ENV container docker 33 | RUN yum -y update && yum -y install httpd && yum clean all 34 | RUN systemctl mask dnf-makecache.timer && systemctl enable httpd 35 | CMD [ "/sbin/init" ] 36 | ``` 37 | 38 | (The `systemctl mask dnf-makecache.timer` is a workaround for a container base image bug) 39 | 40 | You should then be able to execute the following commands: 41 | 42 | ``` 43 | docker build -t httpd . 44 | docker run -ti --stop-signal=RTMIN+3 httpd 45 | ``` 46 | 47 | If you run this hook along with oci-register-machine oci hook, you will be able 48 | to show the container's journal information on the host, using journalctl. 49 | 50 | ``` 51 | journalctl -M CONTAINER_UUID 52 | ``` 53 | 54 | To use this directly with runc, modify or add the following to config.json. 55 | 56 | ``` 57 | "hooks": { 58 | "prestart": [ 59 | { 60 | "path": "/usr/libexec/oci/hooks.d/oci-systemd-hook" 61 | } 62 | ] 63 | }, 64 | ... 65 | "process": { 66 | "capabilities": { 67 | ... 68 | "CAP_AUDIT_WRITE", 69 | "CAP_KILL", 70 | "CAP_NET_BIND_SERVICE", 71 | "CAP_MKNOD", 72 | "CAP_CHOWN", 73 | "CAP_DAC_OVERRIDE", 74 | "CAP_FSETID", 75 | "CAP_FOWNER", 76 | "CAP_NET_RAW", 77 | "CAP_SETGID", 78 | "CAP_SETUID", 79 | "CAP_SETFCAP", 80 | "CAP_SETPCAP", 81 | "CAP_SYS_CHROOT" 82 | ... 83 | "env": [ 84 | "container=oci", 85 | ``` 86 | 87 | **Disabling oci-systemd-hook** 88 | 89 | To disable oci-systemd-hook for a particular run, which is primarily useful in an Atomic Host environment, the environment variable 'oci-systemd-hook' can be set to 'disabled'. This prevents oci-systemd-hook from being run for that invocation. A sample usage is: 90 | 91 | ``` 92 | docker run --env oci-systemd-hook=disabled -it --rm fedora /bin/bash 93 | ``` 94 | 95 | **To build and install** 96 | 97 | Prior to installing oci-systemd-hook, install the following packages on your linux distro: 98 | 99 | * autoconf 100 | * automake 101 | * gcc 102 | * git 103 | * go-md2man 104 | * libmount-devel 105 | * libselinux-devel 106 | * yajl-devel 107 | 108 | In Fedora, you can use this command: 109 | 110 | ``` 111 | yum -y install \ 112 | autoconf \ 113 | automake \ 114 | gcc \ 115 | git \ 116 | go-md2man \ 117 | libmount-devel \ 118 | libselinux-devel \ 119 | yajl-devel 120 | ``` 121 | 122 | Then **clone** this branch and follow these steps: 123 | 124 | ``` 125 | git clone https://github.com/projectatomic/oci-systemd-hook 126 | cd oci-systemd-hook 127 | autoreconf -i 128 | ./configure --libexecdir=/usr/libexec/oci/hooks.d 129 | make 130 | make install 131 | ``` 132 | 133 | [OCI]: https://github.com/opencontainers/runtime-spec 134 | -------------------------------------------------------------------------------- /configure.ac: -------------------------------------------------------------------------------- 1 | AC_INIT([OCI Systemd Hook], 0.2.0) 2 | 3 | AC_CONFIG_AUX_DIR([build-aux]) 4 | AC_CONFIG_HEADERS([config.h]) 5 | AM_INIT_AUTOMAKE([foreign -Wall -Werror subdir-objects]) 6 | AC_PROG_CC 7 | AM_PROG_CC_C_O 8 | AC_USE_SYSTEM_EXTENSIONS 9 | AC_SYS_LARGEFILE 10 | 11 | PKG_CHECK_MODULES([YAJL], [yajl >= 2.0.0]) 12 | PKG_CHECK_MODULES([SELINUX], [libselinux >= 2.0.0]) 13 | PKG_CHECK_MODULES([LIBMOUNT], [mount >= 2.23.0]) 14 | 15 | AC_MSG_CHECKING([whether to disable argument checking]) 16 | AC_ARG_ENABLE([args], AS_HELP_STRING([--disable-args], [disable checking that cmd args are either init/systemd])) 17 | AS_IF([test "x$enable_args" != "xno"], [AC_DEFINE([ARGS_CHECK], [1], [enable checking arguments])]) 18 | 19 | AC_CONFIG_FILES(Makefile) 20 | AC_OUTPUT 21 | -------------------------------------------------------------------------------- /doc/oci-systemd-hook.1.md: -------------------------------------------------------------------------------- 1 | oci-systemd-hook(1) -- OCI systemd hook 2 | ============================================= 3 | 4 | ## SYNOPSIS 5 | 6 | `oci-systemd-hook` prestart [container.json] 7 | 8 | `oci-systemd-hook` poststop 9 | 10 | ## DESCRIPTION 11 | 12 | Setup environment for systemd to run in docker or a OCI compatible runtime. 13 | It is expected to receive the state of the container including the pid and ID over stdin 14 | as defined in the OCI specification (https://github.com/opencontainers/specs). 15 | It mounts tmpfs at /run and /tmp, links journal directory to the host using a bind mount 16 | and creates /etc/machine-id for the container systemd. 17 | 18 | ## ARGUMENTS 19 | 20 | * `prestart`: Setup the systemd environment in a container 21 | 22 | * `container.json`: file which describes the container. oci-systemd-hook will examine the json data for the `CMD` option and only setup the environment if the CMD is `init` or `systemd`. Only available on `prestart`. 23 | 24 | * `poststop`: Teardown and undo the changes on the host done during prestart 25 | 26 | 27 | ## AUTHORS 28 | Mrunal Patel 29 | Dan Walsh 30 | -------------------------------------------------------------------------------- /oci-systemd-hook.json: -------------------------------------------------------------------------------- 1 | { 2 | "cmd": [".*/init$" , ".*/systemd$" ], 3 | "hook": "/usr/libexec/oci/hooks.d/oci-systemd-hook", 4 | "stage": [ "prestart", "poststop" ] 5 | } 6 | -------------------------------------------------------------------------------- /oci-systemd-hook.spec: -------------------------------------------------------------------------------- 1 | %global provider github 2 | %global provider_tld com 3 | %global project projectatomic 4 | %global repo oci-systemd-hook 5 | # https://github.com/projectatomic/oci-systemd-hook 6 | %global provider_prefix %{provider}.%{provider_tld}/%{project}/%{repo} 7 | %global import_path %{provider_prefix} 8 | %global commit 05bd9a0cceb8ad88a2815f25911f519162181def 9 | %global shortcommit %(c=%{commit}; echo ${c:0:7}) 10 | 11 | Name: %{repo} 12 | Version: 0.1.16 13 | Release: 1.git%{shortcommit}%{?dist} 14 | Summary: OCI systemd hook for docker 15 | Group: Applications/Text 16 | License: GPLv3+ 17 | URL: https://%{import_path} 18 | Source0: https://%{import_path}/archive/%{commit}/%{name}-%{shortcommit}.tar.gz 19 | 20 | BuildRequires: autoconf 21 | BuildRequires: automake 22 | BuildRequires: pkgconfig(yajl) 23 | BuildRequires: pkgconfig(libselinux) 24 | BuildRequires: pkgconfig(mount) 25 | BuildRequires: pcre-devel 26 | BuildRequires: go-md2man 27 | Obsoletes: %{name} <= 1.10.3-46 28 | # golang / go-md2man not available on ppc64 29 | ExcludeArch: ppc64 30 | 31 | %description 32 | OCI systemd hooks enable running systemd in a OCI runc/docker container. 33 | 34 | %prep 35 | %setup -q -n %{name}-%{commit} 36 | 37 | %build 38 | aclocal 39 | autoreconf -i 40 | %configure --libexecdir=%{_libexecdir}/oci/hooks.d/ 41 | make %{?_smp_mflags} 42 | 43 | %install 44 | %make_install 45 | 46 | #define license tag if not already defined 47 | %{!?_licensedir:%global license %doc} 48 | %files 49 | %doc README.md 50 | %license LICENSE 51 | %{_mandir}/man1/%{name}.1* 52 | %dir %{_libexecdir}/oci 53 | %dir %{_libexecdir}/oci/hooks.d 54 | %{_libexecdir}/oci/hooks.d/%{name} 55 | %dir %{_usr}/share/containers/oci/hooks.d 56 | %{_usr}/share/containers/oci/hooks.d/oci-systemd-hook.json 57 | 58 | %changelog 59 | * Tue May 1 2018 Dan Walsh - 1:0.1.16-1.git05bd9a0 60 | - Merge pull request #90 from brahim-raddahi/master 61 | - fix invalid /etc/machine-id 62 | 63 | * Thu Dec 21 2017 Dan Walsh - 1:0.1.15-1.git 64 | - Fix issue with oci-systemd-hook running in user namespaces 65 | - fix json file to run container with proper stage field. 66 | 67 | * Wed Sep 13 2017 Dan Walsh - 0.1.5-1.gitde345df 68 | - Add support for json configuration to identify when to use hook 69 | - Needed for crio package 70 | 71 | * Thu Feb 18 2016 Dan Walsh - 0.1.4-1.gitde345df 72 | - Fix up to prepare for review 73 | 74 | * Mon Nov 23 2015 Mrunal Patel - 0.1.3 75 | - Fix bug in man page installation 76 | * Mon Nov 23 2015 Mrunal Patel - 0.1.2 77 | - Add man pages 78 | * Mon Nov 23 2015 Mrunal Patel - 0.1.1 79 | - Initial RPM release 80 | -------------------------------------------------------------------------------- /src/systemdhook.c: -------------------------------------------------------------------------------- 1 | #define _GNU_SOURCE 2 | #include 3 | #include 4 | #include 5 | #include 6 | #include 7 | #include 8 | #include 9 | #include 10 | #include 11 | #include 12 | #include 13 | #include 14 | #include 15 | #include 16 | #include 17 | #include 18 | #include 19 | #include 20 | #include 21 | #include 22 | #include 23 | 24 | #include "config.h" 25 | 26 | #include 27 | 28 | static unsigned long get_mem_total() { 29 | struct sysinfo info; 30 | int ret = sysinfo(&info); 31 | if (ret < 0) { 32 | return ret; 33 | } 34 | return info.totalram; 35 | } 36 | 37 | #define _cleanup_(x) __attribute__((cleanup(x))) 38 | 39 | static inline void freep(void *p) { 40 | free(*(void**) p); 41 | } 42 | 43 | static inline void closep(int *fd) { 44 | if (*fd >= 0) 45 | close(*fd); 46 | *fd = -1; 47 | } 48 | 49 | static inline void fclosep(FILE **fp) { 50 | if (*fp) 51 | fclose(*fp); 52 | *fp = NULL; 53 | } 54 | 55 | static inline void mnt_free_iterp(struct libmnt_iter **itr) { 56 | if (*itr) 57 | mnt_free_iter(*itr); 58 | *itr=NULL; 59 | } 60 | 61 | static inline void mnt_free_fsp(struct libmnt_fs **itr) { 62 | if (*itr) 63 | mnt_free_fs(*itr); 64 | *itr=NULL; 65 | } 66 | 67 | #define _cleanup_free_ _cleanup_(freep) 68 | #define _cleanup_close_ _cleanup_(closep) 69 | #define _cleanup_fclose_ _cleanup_(fclosep) 70 | #define _cleanup_mnt_iter_ _cleanup_(mnt_free_iterp) 71 | #define _cleanup_mnt_fs_ _cleanup_(mnt_free_fsp) 72 | 73 | #define DEFINE_CLEANUP_FUNC(type, func) \ 74 | static inline void func##p(type *p) { \ 75 | if (*p) \ 76 | func(*p); \ 77 | } \ 78 | 79 | DEFINE_CLEANUP_FUNC(yajl_val, yajl_tree_free) 80 | 81 | #define pr_perror(fmt, ...) syslog(LOG_ERR, "systemdhook : " fmt ": %m\n", ##__VA_ARGS__) 82 | #define pr_pinfo(fmt, ...) syslog(LOG_INFO, "systemdhook : " fmt "\n", ##__VA_ARGS__) 83 | #define pr_pdebug(fmt, ...) syslog(LOG_DEBUG, "systemdhook : " fmt "\n", ##__VA_ARGS__) 84 | 85 | #define BUFLEN 1024 86 | #define CHUNKSIZE 4096 87 | 88 | #define CGROUP_ROOT "/sys/fs/cgroup" 89 | #define CGROUP_SYSTEMD CGROUP_ROOT"/systemd" 90 | 91 | char *shortid(const char *id) { 92 | return strndup(id, 12); 93 | } 94 | 95 | static int makepath(char *dir, mode_t mode) 96 | { 97 | if (!dir) { 98 | errno = EINVAL; 99 | return -1; 100 | } 101 | 102 | if (strlen(dir) == 1 && dir[0] == '/') 103 | return 0; 104 | 105 | if (makepath(dirname(strdupa(dir)), mode) < 0 && errno != EEXIST) 106 | return -1; 107 | 108 | return mkdir(dir, mode); 109 | } 110 | 111 | static int makefilepath(char *file, mode_t mode) 112 | { 113 | if (makepath(dirname(strdupa(file)), mode) < 0 && errno != EEXIST) 114 | return -1; 115 | 116 | int fd = creat(file, mode); 117 | if (fd != -1) { 118 | close(fd); 119 | return 0; 120 | } 121 | return fd; 122 | } 123 | 124 | static int remount_readonly(const char *id, const char *src, const char* dest) { 125 | 126 | struct statfs statfs_buf; 127 | if (statfs(src, &statfs_buf) < 0) { 128 | pr_perror("%s: Failed to stat %s", id, src); 129 | return -1; 130 | } 131 | 132 | if (mount(src, dest, "bind", MS_REMOUNT|MS_BIND|MS_RDONLY | statfs_buf.f_flags, "") == -1) { 133 | pr_perror("%s: Failed to remount %s readonly", id, dest); 134 | return -1; 135 | } 136 | return 0; 137 | } 138 | 139 | static int bind_mount(const char *id, const char *src, const char *dest, int readonly) { 140 | if (mount(src, dest, "bind", MS_BIND, NULL) == -1) { 141 | pr_perror("%s: Failed to mount %s on %s", id, src, dest); 142 | return -1; 143 | } 144 | // Remount bind mount to read/only if requested by the caller 145 | if (readonly) { 146 | if (remount_readonly(id, src, dest) < 0) { 147 | return -1; 148 | } 149 | } 150 | return 0; 151 | } 152 | 153 | static int chperm(const char *id, const char *path, const char *label, uint uid, uint gid, bool doChown) { 154 | DIR *dir; 155 | struct dirent *ent; 156 | if ((dir = opendir (path)) != NULL) { 157 | /* print all the files and directories within directory */ 158 | while ((ent = readdir (dir)) != NULL) { 159 | if (!strcmp("..", ent->d_name)) { 160 | // Do not touch the parent directory 161 | continue; 162 | } 163 | _cleanup_free_ char *full_path = NULL; 164 | if (asprintf(&full_path, "%s/%s", path, ent->d_name) < 0) { 165 | pr_perror("%s: Failed to create path for chperm", id); 166 | closedir(dir); 167 | return -1; 168 | } 169 | if (label != NULL && (strcmp("", label))) { 170 | if ((is_selinux_enabled() > 0) && (setfilecon (full_path, label) < 0)) { 171 | pr_perror("%s: Failed to set context %s on %s", id, label, full_path); 172 | } 173 | } 174 | 175 | if (doChown) { 176 | /* Change uid and gid to something the container can handle */ 177 | if (chown(full_path, uid, gid) < 0 ) { 178 | pr_perror("%s: Failed to chown %d:%d to full_path owner: %s", id, uid, gid, full_path); 179 | } 180 | } 181 | } 182 | closedir (dir); 183 | } else { 184 | /* could not open directory */ 185 | pr_perror("%s: Failed to set labels on %s", id, path); 186 | return -1; 187 | } 188 | return 0; 189 | } 190 | 191 | /* 192 | * Get the contents of the file specified by its path 193 | */ 194 | static char *get_file_contents(const char *id, const char *path) { 195 | _cleanup_close_ int fd = -1; 196 | if ((fd = open(path, O_RDONLY)) == -1) { 197 | pr_perror("%s: Failed to open file for reading", id); 198 | return NULL; 199 | } 200 | 201 | char buffer[256]; 202 | ssize_t rd; 203 | rd = read(fd, buffer, sizeof(buffer)-1); 204 | if (rd == -1) { 205 | pr_perror("%s: Failed to read file contents", id); 206 | return NULL; 207 | } 208 | 209 | buffer[rd] = '\0'; 210 | 211 | return strdup(buffer); 212 | } 213 | 214 | /* 215 | * Get the cgroup file system path for the specified process id 216 | */ 217 | static char *get_process_cgroup_subsystem_path(const char *id, int pid, const char *subsystem) { 218 | _cleanup_free_ char *cgroups_file_path = NULL; 219 | int rc; 220 | rc = asprintf(&cgroups_file_path, "/proc/%d/cgroup", pid); 221 | if (rc < 0) { 222 | pr_perror("%s: Failed to allocate memory for cgroups file path", id); 223 | return NULL; 224 | } 225 | 226 | _cleanup_fclose_ FILE *fp = NULL; 227 | fp = fopen(cgroups_file_path, "r"); 228 | if (fp == NULL) { 229 | pr_perror("%s: Failed to open cgroups file", id); 230 | return NULL; 231 | } 232 | 233 | _cleanup_free_ char *line = NULL; 234 | ssize_t read; 235 | size_t len = 0; 236 | char *ptr; 237 | char *subsystem_path = NULL; 238 | while ((read = getline(&line, &len, fp)) != -1) { 239 | pr_pdebug("%s: %s", line, id); 240 | ptr = strchr(line, ':'); 241 | if (ptr == NULL) { 242 | pr_perror("%s: Error parsing cgroup, ':' not found: %s", id, line); 243 | return NULL; 244 | } 245 | pr_pdebug("%s: %s", id, ptr); 246 | ptr++; 247 | if (!strncmp(ptr, subsystem, strlen(subsystem))) { 248 | pr_pdebug("%s: Found cgroup", id); 249 | char *path = strchr(ptr, '/'); 250 | if (path == NULL) { 251 | pr_perror("%s: Error finding path in cgroup: %s", id, line); 252 | return NULL; 253 | } 254 | pr_pdebug("%s: PATH: %s", id, path); 255 | const char *subpath = strchr(subsystem, '='); 256 | if (subpath == NULL) { 257 | subpath = subsystem; 258 | } else { 259 | subpath++; 260 | } 261 | 262 | rc = asprintf(&subsystem_path, "%s/%s%s", CGROUP_ROOT, subpath, path); 263 | if (rc < 0) { 264 | pr_perror("%s: Failed to allocate memory for subsystemd path", id); 265 | return NULL; 266 | } 267 | pr_pdebug("%s: SUBSYSTEM_PATH: %s", id, subsystem_path); 268 | subsystem_path[strlen(subsystem_path) - 1] = '\0'; 269 | return subsystem_path; 270 | } 271 | } 272 | 273 | return NULL; 274 | } 275 | 276 | /* 277 | Mount a tmpfs on the /sys/fs/systemd directory inside of container. 278 | Create a systemd subdir 279 | Remount the tmpfs read/only 280 | */ 281 | static int mount_cgroup(const char *id, const char *rootfs, const char *options, char *systemd_path) 282 | { 283 | _cleanup_free_ char *cgroup_path = NULL; 284 | 285 | if (asprintf(&cgroup_path, "%s/%s", rootfs, CGROUP_ROOT) < 0) { 286 | pr_perror("%s: Failed to create path for %s", id, CGROUP_ROOT); 287 | return -1; 288 | } 289 | if ((makepath(cgroup_path, 0755) == -1) && (errno != EEXIST)) { 290 | pr_perror("%s: Failed to mkdir new dest: %s", id, cgroup_path); 291 | return -1; 292 | } 293 | /* Mount tmpfs at new cgroup directory */ 294 | if (mount("tmpfs", cgroup_path, "tmpfs", MS_NODEV|MS_NOSUID, options) == -1) { 295 | pr_perror("%s: Failed to mount tmpfs at %s", id, cgroup_path); 296 | return -1; 297 | } 298 | if ((makepath(systemd_path, 0755) == -1) && (errno != EEXIST)) { 299 | pr_perror("%s: Failed to mkdir new dest: %s", id, systemd_path); 300 | return -1; 301 | } 302 | if (remount_readonly(id, cgroup_path, cgroup_path) < 0) { 303 | return -1; 304 | } 305 | return 0; 306 | } 307 | 308 | static bool contains_mount(const char *id, const char **config_mounts, unsigned len, const char *mount) { 309 | for (unsigned i = 0; i < len; i++) { 310 | if (!strcmp(mount, config_mounts[i])) { 311 | pr_pdebug("%s: %s already present as a mount point in container configuration, skipping", id, mount); 312 | return true; 313 | } 314 | } 315 | return false; 316 | } 317 | 318 | /* 319 | * Move specified mount to temporary directory 320 | */ 321 | static int move_mount_to_tmp(const char *id, const char *rootfs, const char *tmp_dir, const char *mount_pnt, int offset) 322 | { 323 | int rc; 324 | _cleanup_free_ char *src = NULL; 325 | _cleanup_free_ char *dest = NULL; 326 | _cleanup_free_ char *post = NULL; 327 | 328 | rc = asprintf(&src, "%s/%s", rootfs, mount_pnt); 329 | if (rc < 0) { 330 | pr_perror("%s: Failed to allocate memory for src", id); 331 | return -1; 332 | } 333 | 334 | /* Find the second '/' to get the postfix */ 335 | post = strdup(&mount_pnt[offset]); 336 | 337 | if (!post) { 338 | pr_perror("%s: Failed to allocate memory for postfix", id); 339 | return -1; 340 | } 341 | 342 | rc = asprintf(&dest, "%s/%s", tmp_dir, post); 343 | if (rc < 0) { 344 | pr_perror("%s: Failed to allocate memory for dest", id); 345 | return -1; 346 | } 347 | 348 | struct stat stat_buf; 349 | 350 | if (stat(src, &stat_buf) == -1) { 351 | pr_perror("%s: Failed to stat: %s", id, src); 352 | return -1; 353 | } 354 | 355 | if (S_ISDIR(stat_buf.st_mode)) { 356 | if (makepath(dest, 0755) == -1) { 357 | if (errno != EEXIST) { 358 | pr_perror("%s: Failed to mkdir new dest: %s", id, dest); 359 | return -1; 360 | } 361 | } 362 | } else { 363 | if (makefilepath(dest, 0755) == -1) { 364 | if (errno != EEXIST) { 365 | pr_perror("%s: Failed to create new dest: %s", id, dest); 366 | return -1; 367 | } 368 | } 369 | } 370 | 371 | /* Move the mount to temporary directory */ 372 | if ((mount(src, dest, "", MS_MOVE, "") == -1)) { 373 | pr_perror("%s: Failed to move mount %s to %s", id, src, dest); 374 | return -1; 375 | } 376 | 377 | return 0; 378 | } 379 | 380 | static int move_mounts(const char *id, 381 | const char *rootfs, 382 | const char *path, 383 | const char **config_mounts, 384 | unsigned config_mounts_len, 385 | uint uid, 386 | uint gid, 387 | char *options 388 | ) { 389 | 390 | char mount_dir[PATH_MAX]; 391 | snprintf(mount_dir, PATH_MAX, "%s%s", rootfs, path); 392 | 393 | /* Create a temporary directory to move the PATH mounts to */ 394 | char temp_template[] = "/tmp/ocitmp.XXXXXX"; 395 | 396 | char *tmp_dir = mkdtemp(temp_template); 397 | if (tmp_dir == NULL) { 398 | pr_perror("%s: Failed to create temporary directory for mounts", id); 399 | return -1; 400 | } 401 | 402 | /* Create the PATH directory */ 403 | if (!contains_mount(id, config_mounts, config_mounts_len, path)) { 404 | if (mkdir(mount_dir, 0755) == -1) { 405 | if (errno != EEXIST) { 406 | pr_perror("%s: Failed to mkdir: %s", id, mount_dir); 407 | return -1; 408 | } 409 | } 410 | 411 | /* Mount tmpfs at new temp directory */ 412 | if (mount("tmpfs", tmp_dir, "tmpfs", MS_NODEV|MS_NOSUID, options) == -1) { 413 | pr_perror("%s: Failed to mount tmpfs at %s", id, tmp_dir); 414 | return -1; 415 | } 416 | 417 | /* Move other user specified mounts under PATH to temporary directory */ 418 | for (unsigned i = 0; i < config_mounts_len; i++) { 419 | /* Match destinations that begin with PATH */ 420 | if (!strncmp(path, config_mounts[i], strlen(path))) { 421 | if (move_mount_to_tmp(id, rootfs, tmp_dir, config_mounts[i], strlen(path)) < 0) { 422 | pr_perror("%s: Failed to move %s to %s", id, config_mounts[i], tmp_dir); 423 | return -1; 424 | } 425 | } 426 | } 427 | 428 | /* Move temporary directory to PATH */ 429 | if ((mount(tmp_dir, mount_dir, "", MS_MOVE, "") == -1)) { 430 | pr_perror("%s: Failed to move mount %s to %s", id, tmp_dir, mount_dir); 431 | return -1; 432 | } 433 | if (chown(mount_dir, uid, gid) < 0 ) { 434 | pr_perror("%s: Failed to chown %d:%d to mount_dir owner: %s", id, uid, gid, mount_dir); 435 | } 436 | } 437 | 438 | /* Remove the temp directory for PATH */ 439 | if (rmdir(tmp_dir) < 0) { 440 | pr_perror("%s: Failed to remove %s", id, tmp_dir); 441 | return -1; 442 | } 443 | return 0; 444 | } 445 | 446 | static int prestart(const char *rootfs, 447 | const char *container_uuid, 448 | const char *id, 449 | int pid, 450 | const char *mount_label, 451 | const char **config_mounts, 452 | unsigned config_mounts_len, 453 | uint uid, 454 | uint gid) 455 | { 456 | _cleanup_close_ int fd = -1; 457 | _cleanup_free_ char *options = NULL; 458 | 459 | int rc = -1; 460 | char process_mnt_ns_fd[PATH_MAX]; 461 | snprintf(process_mnt_ns_fd, PATH_MAX, "/proc/%d/ns/mnt", pid); 462 | 463 | fd = open(process_mnt_ns_fd, O_RDONLY); 464 | if (fd < 0) { 465 | pr_perror("%s: Failed to open mnt namespace fd %s", id, process_mnt_ns_fd); 466 | return -1; 467 | } 468 | 469 | /* Join the mount namespace of the target process */ 470 | if (setns(fd, 0) == -1) { 471 | pr_perror("%s: Failed to setns to %s", id, process_mnt_ns_fd); 472 | return -1; 473 | } 474 | close(fd); 475 | fd = -1; 476 | 477 | /* Switch to the root directory */ 478 | if (chdir("/") == -1) { 479 | pr_perror("%s: Failed to chdir", id); 480 | return -1; 481 | } 482 | 483 | if (!strcmp("", mount_label)) { 484 | rc = asprintf(&options, "mode=755,size=65536k"); 485 | } else { 486 | rc = asprintf(&options, "mode=755,size=65536k,context=\"%s\"", mount_label); 487 | } 488 | if (rc < 0) { 489 | pr_perror("%s: Failed to allocate memory for context", id); 490 | return -1; 491 | } 492 | 493 | rc = move_mounts(id, rootfs, "/run", config_mounts, config_mounts_len, uid, gid, options); 494 | if (rc < 0) { 495 | return rc; 496 | } 497 | 498 | rc = move_mounts(id, rootfs, "/run/lock", config_mounts, config_mounts_len, uid, gid, options); 499 | if (rc < 0) { 500 | return rc; 501 | } 502 | 503 | _cleanup_free_ char *memory_cgroup_path = NULL; 504 | memory_cgroup_path = get_process_cgroup_subsystem_path(id, pid, "memory"); 505 | if (!memory_cgroup_path) { 506 | pr_perror("%s: Failed to get memory subsystem path for the process", id); 507 | return -1; 508 | } 509 | 510 | char memory_limit_path[PATH_MAX]; 511 | snprintf(memory_limit_path, PATH_MAX, "%s/memory.limit_in_bytes", memory_cgroup_path); 512 | 513 | pr_pdebug("%s: memory path: %s", id, memory_limit_path); 514 | 515 | _cleanup_free_ char *memory_limit_str = NULL; 516 | memory_limit_str = get_file_contents(id, memory_limit_path); 517 | if (!memory_limit_str) { 518 | pr_perror("%s: Failed to get memory limit from cgroups", id); 519 | return -1; 520 | } 521 | 522 | pr_pdebug("%s: LIMIT: %s", id, memory_limit_str); 523 | 524 | char memory_str[PATH_MAX]; 525 | uint64_t total_memory = 0; 526 | uint64_t memory_limit_in_bytes = 0; 527 | char *ptr = NULL; 528 | 529 | memory_limit_in_bytes = strtoull(memory_limit_str, &ptr, 10); 530 | 531 | pr_pdebug("%s: Limit in bytes: ""%" PRIu64 "", id, memory_limit_in_bytes); 532 | 533 | total_memory = get_mem_total(); 534 | if (memory_limit_in_bytes < total_memory) { 535 | /* Set it to half of limit in kb */ 536 | uint64_t memory_limit_in_kb = memory_limit_in_bytes / 2048; 537 | snprintf(memory_str, sizeof(memory_str)-1 , ",size=%" PRIu64 "k", memory_limit_in_kb); 538 | } else { 539 | strcpy(memory_str, ""); 540 | } 541 | 542 | char tmp_dir[PATH_MAX]; 543 | snprintf(tmp_dir, PATH_MAX, "%s/tmp", rootfs); 544 | 545 | /* 546 | Create a /var/log/journal directory on the host and mount it into 547 | the container. 548 | */ 549 | if (!contains_mount(id, config_mounts, config_mounts_len, "/var/log/journal")) { 550 | char journal_dir[PATH_MAX]; 551 | snprintf(journal_dir, PATH_MAX, "/var/log/journal/%.32s", container_uuid); 552 | char cont_journal_dir[PATH_MAX]; 553 | snprintf(cont_journal_dir, PATH_MAX, "%s/var/log/journal", rootfs); 554 | if (makepath(journal_dir, 0755) == -1) { 555 | if (errno != EEXIST) { 556 | pr_perror("%s: Failed to mkdir journal dir: %s", id, journal_dir); 557 | return -1; 558 | } 559 | } 560 | 561 | if (strcmp("", mount_label)) { 562 | if ((is_selinux_enabled() > 0) && 563 | (setfilecon(journal_dir, (security_context_t)mount_label) < 0)) { 564 | pr_perror("%s: Failed to set journal dir selinux context", id); 565 | return -1; 566 | } 567 | } 568 | 569 | /* Attempt to creare /var/log/journal inside of rootfs, 570 | if successful, or directory exists, mount tmpfs on top of 571 | it, so that systemd can write journal to it, even in 572 | read/only images 573 | */ 574 | if ((makepath(cont_journal_dir, 0755) == 0) || 575 | (errno == EEXIST)) { 576 | snprintf(cont_journal_dir, PATH_MAX, "%s%s", rootfs, journal_dir); 577 | /* Mount tmpfs at /var/log/journal for systemd */ 578 | rc = move_mounts(id, rootfs, "/var/log/journal", config_mounts, config_mounts_len, uid, gid, options); 579 | if (rc < 0) { 580 | return rc; 581 | } 582 | } else { 583 | /* If you can't create /var/log/journal inside of rootfs, 584 | create /run/log/journal instead, systemd should write here 585 | if it is not allowed to write to /var/log/journal 586 | */ 587 | snprintf(cont_journal_dir, PATH_MAX, "%s/run/log/journal/%.32s", rootfs, container_uuid); 588 | } 589 | 590 | if ((makepath(cont_journal_dir, 0755) == -1) && 591 | (errno != EEXIST)) { 592 | pr_perror("%s: Failed to mkdir container journal dir: %s", id, cont_journal_dir); 593 | return -1; 594 | } 595 | 596 | /* Mount journal directory at cont_journal_dir path in the container */ 597 | if (bind_mount(id, journal_dir, cont_journal_dir, false) == -1) { 598 | return -1; 599 | } 600 | 601 | /* Change perms, uid and gid to something the container can handle */ 602 | if (chperm(id, cont_journal_dir, mount_label, uid, gid, true) < 0) { 603 | return -1; 604 | } 605 | } 606 | 607 | /* Create the /tmp directory */ 608 | if (!contains_mount(id, config_mounts, config_mounts_len, "/tmp")) { 609 | if (mkdir(tmp_dir, 0755) == -1) { 610 | if (errno != EEXIST) { 611 | pr_perror("%s: Failed to mkdir: %s", id, tmp_dir); 612 | return -1; 613 | } 614 | } 615 | 616 | free(options); options=NULL; 617 | if (!strcmp("", mount_label)) { 618 | rc = asprintf(&options, "mode=1777%s", memory_str); 619 | } else { 620 | rc = asprintf(&options, "mode=1777%s,context=\"%s\"", memory_str, mount_label); 621 | } 622 | if (rc < 0) { 623 | pr_perror("%s: Failed to allocate memory for context", id); 624 | return -1; 625 | } 626 | 627 | /* Mount tmpfs at /tmp for systemd */ 628 | rc = move_mounts(id, rootfs, "/tmp", config_mounts, config_mounts_len, uid, gid, options); 629 | if (rc < 0) { 630 | return rc; 631 | } 632 | } 633 | 634 | /* 635 | * initialize libmount 636 | */ 637 | 638 | /* 639 | if CGROUP_ROOT is not bind mounted, we need to create a tmpfs on 640 | it, and then create the systemd directory underneath it 641 | */ 642 | 643 | _cleanup_free_ char *systemd_path = NULL; 644 | if (asprintf(&systemd_path, "%s/%s", rootfs, CGROUP_SYSTEMD) < 0) { 645 | pr_perror("%s: Failed to create path for %s", id, CGROUP_ROOT); 646 | return -1; 647 | } 648 | if (!contains_mount(id, config_mounts, config_mounts_len, CGROUP_ROOT)) { 649 | rc = mount_cgroup(id, rootfs, options, systemd_path); 650 | if (rc < 0) { 651 | pr_perror("%s: mount_cgroup failed", id); 652 | return -1; 653 | } 654 | 655 | } else { 656 | if ((makepath(systemd_path, 0755) == -1) && (errno != EEXIST)) { 657 | pr_perror("%s: Failed to mkdir new dest: %s", id, systemd_path); 658 | return -1; 659 | } 660 | } 661 | 662 | if (bind_mount(id, CGROUP_SYSTEMD, systemd_path, true)) { 663 | pr_perror("%s: Failed to bind mount %s on %s", id, CGROUP_SYSTEMD, systemd_path); 664 | return -1; 665 | } 666 | 667 | /* 668 | Mount the writable systemd hierarchy into the container 669 | */ 670 | _cleanup_free_ char *named_path = NULL; 671 | named_path = get_process_cgroup_subsystem_path(id, pid, "name=systemd"); 672 | _cleanup_free_ char *systemd_named_path = NULL; 673 | if (asprintf(&systemd_named_path, "%s/%s", rootfs, named_path) < 0) { 674 | pr_perror("%s: Failed to create path for %s/%s", id, rootfs, systemd_named_path); 675 | return -1; 676 | } 677 | if (bind_mount(id, named_path, systemd_named_path, false)) { 678 | pr_perror("%s: Failed to bind mount %s on %s", id, CGROUP_SYSTEMD, systemd_named_path); 679 | return -1; 680 | } 681 | 682 | /*** 683 | * chown will fail on /var/lib/docker files as they are not on the 684 | * container so let's pass false to not have it done in the chperm 685 | * function. 686 | ***/ 687 | if (chperm(id, systemd_named_path, mount_label, uid, gid, false) < 0) { 688 | return -1; 689 | } 690 | 691 | /*** 692 | * chown files in the /sys/fs/cgroup directory paths to the 693 | * container's uid and gid, so let's pass true here. 694 | ***/ 695 | if (chperm(id, named_path, mount_label, uid, gid, true) < 0) { 696 | return -1; 697 | } 698 | 699 | /* 700 | Create /etc/machine-id if it does not exist 701 | */ 702 | if (!contains_mount(id, config_mounts, config_mounts_len, "/etc/machine-id")) { 703 | char mid_path[PATH_MAX]; 704 | snprintf(mid_path, PATH_MAX, "%s/etc/machine-id", rootfs); 705 | fd = open(mid_path, O_CREAT|O_WRONLY, 0444); 706 | if (fd < 0) { 707 | pr_perror("%s: Failed to open %s for writing", id, mid_path); 708 | return -1; 709 | } 710 | 711 | rc = dprintf(fd, "%.32s\n", container_uuid); 712 | if (rc < 0) { 713 | pr_perror("%s: Failed to write id to %s", id, mid_path); 714 | return -1; 715 | } 716 | } 717 | 718 | return 0; 719 | } 720 | 721 | static int poststop( 722 | const char *id, 723 | const char *rootfs, 724 | const char **config_mounts, 725 | unsigned config_mounts_len) 726 | { 727 | if (contains_mount(id, config_mounts, config_mounts_len, "/etc/machine-id")) { 728 | return 0; 729 | } 730 | 731 | int ret = 0; 732 | char mid_path[PATH_MAX]; 733 | snprintf(mid_path, PATH_MAX, "%s/etc/machine-id", rootfs); 734 | 735 | if (unlink(mid_path) != 0 && (errno != ENOENT)) { 736 | pr_perror("%s: Unable to remove %s", id, mid_path); 737 | ret = 1; 738 | } 739 | 740 | return ret; 741 | } 742 | 743 | /* 744 | * Read the entire content of stream pointed to by 'from' into a buffer in memory. 745 | * Return a pointer to the resulting NULL-terminated string. 746 | */ 747 | char *getJSONstring(FILE *from, size_t chunksize, char *msg) 748 | { 749 | struct stat stat_buf; 750 | char *err = NULL, *JSONstring = NULL; 751 | size_t nbytes, bufsize; 752 | 753 | if (fstat(fileno(from), &stat_buf) == -1) { 754 | err = "fstat failed"; 755 | goto fail; 756 | } 757 | 758 | if (S_ISREG(stat_buf.st_mode)) { 759 | /* 760 | * If 'from' is a regular file, allocate a buffer based 761 | * on the file size and read the entire content with a 762 | * single fread() call. 763 | */ 764 | if (stat_buf.st_size == 0) { 765 | err = "is empty"; 766 | goto fail; 767 | } 768 | 769 | bufsize = (size_t)stat_buf.st_size; 770 | 771 | JSONstring = (char *)malloc(bufsize + 1); 772 | if (JSONstring == NULL) { 773 | err = "failed to allocate buffer"; 774 | goto fail; 775 | } 776 | 777 | nbytes = fread((void *)JSONstring, 1, (size_t)bufsize, from); 778 | if (nbytes != (size_t)bufsize) { 779 | err = "error encountered on read"; 780 | goto fail; 781 | } 782 | } else { 783 | /* 784 | * If 'from' is not a regular file, call fread() iteratively 785 | * to read sections of 'chunksize' bytes until EOF is reached. 786 | * Call realloc() during each iteration to expand the buffer 787 | * as needed. 788 | */ 789 | bufsize = 0; 790 | 791 | for (;;) { 792 | JSONstring = (char *)realloc((void *)JSONstring, bufsize + chunksize); 793 | if (JSONstring == NULL) { 794 | err = "failed to allocate buffer"; 795 | goto fail; 796 | } 797 | 798 | nbytes = fread((void *)&JSONstring[bufsize], 1, (size_t)chunksize, from); 799 | bufsize += nbytes; 800 | 801 | if (nbytes != (size_t)chunksize) { 802 | if (ferror(from)) { 803 | err = "error encountered on read"; 804 | goto fail; 805 | } 806 | if (feof(from)) 807 | break; 808 | } 809 | } 810 | 811 | if (bufsize == 0) { 812 | err = "is empty"; 813 | goto fail; 814 | } 815 | 816 | JSONstring = (char *)realloc((void *)JSONstring, bufsize + 1); 817 | if (JSONstring == NULL) { 818 | err = "failed to allocate buffer"; 819 | goto fail; 820 | } 821 | } 822 | 823 | /* make sure the string is NULL-terminated */ 824 | JSONstring[bufsize] = 0; 825 | return JSONstring; 826 | fail: 827 | free(JSONstring); 828 | pr_perror("%s: %s", msg, err); 829 | return NULL; 830 | } 831 | 832 | int main(int argc, char *argv[]) 833 | { 834 | _cleanup_(yajl_tree_freep) yajl_val node = NULL; 835 | _cleanup_(yajl_tree_freep) yajl_val config_node = NULL; 836 | char errbuf[PATH_MAX+100]; 837 | char *stateData; 838 | char *configData; 839 | char config_file_name[PATH_MAX]; 840 | _cleanup_fclose_ FILE *fp = NULL; 841 | 842 | /* Read the entire state from stdin */ 843 | stateData = getJSONstring(stdin, (size_t)CHUNKSIZE, "failed to read state data from standard input"); 844 | if (stateData == NULL) 845 | return EXIT_FAILURE; 846 | 847 | /* Parse the state */ 848 | memset(errbuf, 0, sizeof(errbuf)); 849 | node = yajl_tree_parse((const char *)stateData, errbuf, sizeof(errbuf)); 850 | if (node == NULL) { 851 | if (strlen(errbuf)) { 852 | pr_perror("parse_error: %s", errbuf); 853 | } else { 854 | pr_perror("parse_error: unknown error"); 855 | } 856 | return EXIT_FAILURE; 857 | } 858 | 859 | const char *id_path[] = { "id", (const char *)0 }; 860 | yajl_val v_id = yajl_tree_get(node, id_path, yajl_t_string); 861 | if (!v_id) { 862 | pr_perror("id not found in state"); 863 | return EXIT_FAILURE; 864 | } 865 | char *container_uuid = YAJL_GET_STRING(v_id); 866 | _cleanup_free_ char *id = NULL; 867 | id = shortid(container_uuid); 868 | if (!id) { 869 | pr_perror("%s: failed to create shortid", container_uuid); 870 | return EXIT_FAILURE; 871 | } 872 | 873 | const char *pid_path[] = { "pid", (const char *) 0 }; 874 | yajl_val v_pid = yajl_tree_get(node, pid_path, yajl_t_number); 875 | if (!v_pid) { 876 | pr_perror("%s: pid not found in state", id); 877 | return EXIT_FAILURE; 878 | } 879 | int target_pid = YAJL_GET_INTEGER(v_pid); 880 | 881 | /* 'bundle' must be specified for the OCI hooks, and from there we read the configuration file */ 882 | const char *bundle_path[] = { "bundle", (const char *)0 }; 883 | yajl_val v_bundle_path = yajl_tree_get(node, bundle_path, yajl_t_string); 884 | if (!v_bundle_path) { 885 | const char *bundle_path[] = { "bundlePath", (const char *)0 }; 886 | v_bundle_path = yajl_tree_get(node, bundle_path, yajl_t_string); 887 | } 888 | if (!v_bundle_path) { 889 | /**** 890 | * On Docker versions prior to 1.12, bundlePath will not 891 | * be provided. Let's exit quietly if not found. 892 | ****/ 893 | pr_pinfo("%s: Failed reading state data: bundlePath not found. Generally this indicates Docker versions prior to 1.12 are installed.", id); 894 | return EXIT_SUCCESS; 895 | } 896 | snprintf(config_file_name, sizeof(config_file_name), "%s/config.json", YAJL_GET_STRING(v_bundle_path)); 897 | fp = fopen(config_file_name, "r"); 898 | 899 | if (fp == NULL) { 900 | pr_perror("%s: Failed to open config file: %s", id, config_file_name); 901 | return EXIT_FAILURE; 902 | } 903 | 904 | /* Read the entire config file */ 905 | snprintf(errbuf, sizeof(errbuf), "failed to read config data from %s", config_file_name); 906 | configData = getJSONstring(fp, (size_t)CHUNKSIZE, errbuf); 907 | if (configData == NULL) 908 | return EXIT_FAILURE; 909 | 910 | /* Parse the config file */ 911 | memset(errbuf, 0, sizeof(errbuf)); 912 | config_node = yajl_tree_parse((const char *)configData, errbuf, sizeof(errbuf)); 913 | if (config_node == NULL) { 914 | if (strlen(errbuf)) { 915 | pr_perror("%s: parse_error: %s", id, errbuf); 916 | } else { 917 | pr_perror("%s: parse_error: unknown error", id); 918 | } 919 | return EXIT_FAILURE; 920 | } 921 | 922 | const char *args_path[] = {"process", "args", (const char *)0 }; 923 | yajl_val v_args = yajl_tree_get(config_node, args_path, yajl_t_array); 924 | if (!v_args) { 925 | pr_perror("%s: args not found in config", id); 926 | return EXIT_FAILURE; 927 | } 928 | 929 | const char *envs[] = {"process", "env", (const char *)0 }; 930 | yajl_val v_envs = yajl_tree_get(config_node, envs, yajl_t_array); 931 | if (v_envs) { 932 | for (unsigned int i = 0; i < YAJL_GET_ARRAY(v_envs)->len; i++) { 933 | yajl_val v_env = YAJL_GET_ARRAY(v_envs)->values[i]; 934 | char *str = YAJL_GET_STRING(v_env); 935 | /**** 936 | * If the oci-systemd-hook variable is passed with "disabled", 937 | * stop execution of oci-systemd-hook. 938 | ******/ 939 | if (strncmp (str, "oci-systemd-hook=", strlen ("oci-systemd-hook=")) == 0) { 940 | int valStart = strlen(str) - strlen("disabled"); 941 | if (strcasecmp(&str[valStart], "disabled") == 0) { 942 | return EXIT_SUCCESS; 943 | } 944 | } 945 | if (strncmp (str, "container_uuid=", strlen ("container_uuid=")) == 0) { 946 | container_uuid = strdup (str + strlen ("container_uuid=")); 947 | /* systemd expects $container_uuid= to be an UUID but then treat it as 948 | not containing any '-'. Do the same here. */ 949 | char *to = container_uuid; 950 | for (char *from = to; *from; from++) { 951 | if (*from != '-') 952 | *to++ = *from; 953 | } 954 | *to = '\0'; 955 | } 956 | } 957 | } 958 | 959 | #if ARGS_CHECK 960 | char *cmd = NULL; 961 | yajl_val v_arg0_value = YAJL_GET_ARRAY(v_args)->values[0]; 962 | cmd = YAJL_GET_STRING(v_arg0_value); 963 | /* Don't do anything if init is actually container runtime bind mounted /dev/init */ 964 | if (!strcmp(cmd, "/dev/init")) { 965 | pr_pdebug("%s: Skipping as container command is /dev/init, not systemd init", id); 966 | return EXIT_SUCCESS; 967 | } 968 | char *cmd_file_name = basename(cmd); 969 | if (strcmp("init", cmd_file_name) && strcmp("systemd", cmd_file_name)) { 970 | pr_pdebug("%s: Skipping as container command is %s, not init or systemd", id, cmd); 971 | return EXIT_SUCCESS; 972 | } 973 | #endif 974 | 975 | /* Extract values from the config json */ 976 | const char *root_path[] = { "root", "path", (const char *)0 }; 977 | yajl_val v_root = yajl_tree_get(config_node, root_path, yajl_t_string); 978 | if (!v_root) { 979 | pr_perror("%s: root path not found in config.json", id); 980 | return EXIT_FAILURE; 981 | } 982 | char *rootfs = YAJL_GET_STRING(v_root); 983 | 984 | /* Prepend bundle path if the rootfs string is relative */ 985 | if (rootfs[0] != '/') { 986 | char *new_rootfs; 987 | 988 | if (asprintf(&new_rootfs, "%s/%s", YAJL_GET_STRING(v_bundle_path), rootfs) < 0) { 989 | pr_perror("%s: failed to alloc rootfs", id); 990 | return EXIT_FAILURE; 991 | } 992 | rootfs = new_rootfs; 993 | } 994 | 995 | pr_pdebug("%s: rootfs=%s", id, rootfs); 996 | const char **config_mounts = NULL; 997 | unsigned config_mounts_len = 0; 998 | unsigned array_len = 0; 999 | 1000 | const char *mount_points_path[] = {"mounts", (const char *)0 }; 1001 | yajl_val v_mounts = yajl_tree_get(config_node, mount_points_path, yajl_t_array); 1002 | if (!v_mounts) { 1003 | pr_perror("%s: mounts not found in config", id); 1004 | return EXIT_FAILURE; 1005 | } 1006 | 1007 | config_mounts_len = YAJL_GET_ARRAY(v_mounts)->len; 1008 | config_mounts = malloc (sizeof(char *) * (config_mounts_len + 1)); 1009 | if (! config_mounts) { 1010 | pr_perror("%s: error malloc'ing", id); 1011 | return EXIT_FAILURE; 1012 | } 1013 | 1014 | for (unsigned int i = 0; i < config_mounts_len; i++) { 1015 | yajl_val v_mounts_values = YAJL_GET_ARRAY(v_mounts)->values[i]; 1016 | 1017 | const char *destination_path[] = {"destination", (const char *)0 }; 1018 | yajl_val v_destination = yajl_tree_get(v_mounts_values, destination_path, yajl_t_string); 1019 | if (!v_destination) { 1020 | pr_perror("%s: Cannot find mount destination", id); 1021 | return EXIT_FAILURE; 1022 | } 1023 | config_mounts[i] = YAJL_GET_STRING(v_destination); 1024 | } 1025 | 1026 | /* OCI hooks set target_pid to 0 on poststop, as the container process 1027 | already exited. If target_pid is bigger than 0 then it is a start 1028 | hook. 1029 | In most cases the calling program will set the environment variable 1030 | "stage" to either prestart, poststart or poststop. 1031 | We also support passing the stage as argv[1], 1032 | In certain cases we also support passing of no argv[1], and no environment variable, 1033 | then default to prestart if the target_pid != 0, poststop if target_pid == 0. 1034 | */ 1035 | char *stage = getenv("stage"); 1036 | if (stage == NULL && argc > 2) { 1037 | stage = argv[1]; 1038 | } 1039 | if ((stage != NULL && !strcmp(stage, "prestart")) || 1040 | (argc == 1 && target_pid)) { 1041 | char *mount_label = NULL; 1042 | /* Extract values from the config json */ 1043 | const char *mount_label_path[] = { "linux", "mountLabel", (const char *)0 }; 1044 | yajl_val v_mount = yajl_tree_get(config_node, mount_label_path, yajl_t_string); 1045 | mount_label = v_mount ? YAJL_GET_STRING(v_mount) : ""; 1046 | 1047 | /* Get the gid value. */ 1048 | int gid = -1; 1049 | const char *gid_mappings[] = {"linux", "gidMappings", (const char *)0 }; 1050 | yajl_val v_gidMappings = yajl_tree_get(config_node, gid_mappings, yajl_t_array); 1051 | if (!v_gidMappings) { 1052 | pr_pdebug("%s: gidMappings not found in config", id); 1053 | gid=0; 1054 | } 1055 | 1056 | const char *container_path[] = {"containerID", (const char *)0 }; 1057 | if (gid != 0) { 1058 | array_len = YAJL_GET_ARRAY(v_gidMappings)->len; 1059 | if (array_len < 1) { 1060 | pr_perror("%s: No gid for container found", id); 1061 | return EXIT_FAILURE; 1062 | } 1063 | 1064 | const char *gid_path[] = {"hostID", (const char *)0 }; 1065 | for (unsigned int i = 0; i < array_len; i++) { 1066 | yajl_val v_gidMappings_values = YAJL_GET_ARRAY(v_gidMappings)->values[i]; 1067 | yajl_val v_containerId = yajl_tree_get(v_gidMappings_values, container_path, yajl_t_number); 1068 | if (YAJL_GET_INTEGER(v_containerId) == 0) { 1069 | yajl_val v_gid = yajl_tree_get(v_gidMappings_values, gid_path, yajl_t_number); 1070 | gid = v_gid ? YAJL_GET_INTEGER(v_gid) : -1; 1071 | i = array_len; 1072 | } 1073 | } 1074 | } /* End if (gid!=0) */ 1075 | 1076 | pr_pdebug("%s: GID: %d", id, gid); 1077 | 1078 | /* Get the uid value. */ 1079 | int uid = -1; 1080 | const char *uid_mappings[] = {"linux", "uidMappings", (const char *)0 }; 1081 | yajl_val v_uidMappings = yajl_tree_get(config_node, uid_mappings, yajl_t_array); 1082 | if (!v_uidMappings) { 1083 | pr_pdebug("%s: uidMappings not found in config", id); 1084 | uid = 0; 1085 | } 1086 | 1087 | if (uid !=0) { 1088 | array_len = YAJL_GET_ARRAY(v_uidMappings)->len; 1089 | if (array_len < 1) { 1090 | pr_perror("%s: No uid for container found", id); 1091 | return EXIT_FAILURE; 1092 | } 1093 | 1094 | const char *uid_path[] = {"hostID", (const char *)0 }; 1095 | for (unsigned int i = 0; i < array_len; i++) { 1096 | yajl_val v_uidMappings_values = YAJL_GET_ARRAY(v_uidMappings)->values[i]; 1097 | yajl_val v_containerId = yajl_tree_get(v_uidMappings_values, container_path, yajl_t_number); 1098 | if (YAJL_GET_INTEGER(v_containerId) == 0) { 1099 | yajl_val v_uid = yajl_tree_get(v_uidMappings_values, uid_path, yajl_t_number); 1100 | uid = v_uid ? YAJL_GET_INTEGER(v_uid) : -1; 1101 | i = array_len; 1102 | } 1103 | } 1104 | } /* End if (uid !=0) */ 1105 | 1106 | pr_pdebug("%s: UID: %d", id, uid); 1107 | 1108 | if (prestart(rootfs, container_uuid, id, target_pid, mount_label, config_mounts, config_mounts_len, uid, gid) != 0) { 1109 | return EXIT_FAILURE; 1110 | } 1111 | /* If caller did not specify argv[1], and target_pid == 0, we default 1112 | to postop. 1113 | */ 1114 | } else if ((stage != NULL && !strcmp(stage, "poststop")) || 1115 | (argc == 1 && target_pid == 0)) { 1116 | if (poststop(id, rootfs, config_mounts, config_mounts_len) != 0) { 1117 | return EXIT_FAILURE; 1118 | } 1119 | } else { 1120 | pr_pdebug("%s: only runs in prestart and poststop stage, ignoring", id); 1121 | } 1122 | free(config_mounts); 1123 | return EXIT_SUCCESS; 1124 | } 1125 | --------------------------------------------------------------------------------