From 74fe1fe36e35a26d764f1e3119d5f6d014db573c Mon Sep 17 00:00:00 2001 From: Lennart Poettering Date: Wed, 17 Nov 2010 20:22:07 +0100 Subject: [PATCH] pam: duplicate cgroup tree in the cpu hierarchy by default, optionally more --- TODO | 4 ++ src/pam-module.c | 95 +++++++++++++++++++++++++++++++++++++++++------- 2 files changed, 85 insertions(+), 14 deletions(-) diff --git a/TODO b/TODO index f3788c526..260ce457b 100644 --- a/TODO +++ b/TODO @@ -88,6 +88,10 @@ * add to cpu cgroup by default +* introduce crypttab.target + +* make cryptsetup lower --iter-time + External: * patch kernel for xattr support in /dev, /proc/, /sys and /sys/fs/cgroup. diff --git a/src/pam-module.c b/src/pam-module.c index bc99684e1..54a7b451e 100644 --- a/src/pam-module.c +++ b/src/pam-module.c @@ -35,14 +35,17 @@ #include "cgroup-util.h" #include "macro.h" #include "sd-daemon.h" +#include "strv.h" static int parse_argv(pam_handle_t *handle, int argc, const char **argv, bool *create_session, bool *kill_session, - bool *kill_user) { + bool *kill_user, + char ***controllers) { unsigned i; + bool controller_set = false; assert(argc >= 0); assert(argc == 0 || argv); @@ -58,6 +61,7 @@ static int parse_argv(pam_handle_t *handle, if (create_session) *create_session = k; + } else if (startswith(argv[i], "kill-session=")) { if ((k = parse_boolean(argv[i] + 13)) < 0) { pam_syslog(handle, LOG_ERR, "Failed to parse kill-session= argument."); @@ -75,12 +79,43 @@ static int parse_argv(pam_handle_t *handle, if (kill_user) *kill_user = k; + + } else if (startswith(argv[i], "controllers=")) { + + if (controllers) { + char **l; + + if (!(l = strv_split(argv[i] + 12, ","))) { + pam_syslog(handle, LOG_ERR, "Out of memory."); + return -ENOMEM; + } + + strv_free(*controllers); + *controllers = l; + } + + controller_set = true; + } else { pam_syslog(handle, LOG_ERR, "Unknown parameter '%s'.", argv[i]); return -EINVAL; } } + if (!controller_set && controllers) { + char **l; + + if (!(l = strv_new("cpu", NULL))) { + pam_syslog(handle, LOG_ERR, "Out of memory"); + return -ENOMEM; + } + + *controllers = l; + } + + if (controllers) + strv_remove(*controllers, "name=systemd"); + if (kill_session && *kill_session && kill_user) *kill_user = true; @@ -226,16 +261,23 @@ static int get_user_data( return PAM_SUCCESS; } -static int create_user_group(pam_handle_t *handle, const char *group, struct passwd *pw, bool attach, bool remember) { +static int create_user_group( + pam_handle_t *handle, + const char *controller, + const char *group, + struct passwd *pw, + bool attach, + bool remember) { + int r; assert(handle); assert(group); if (attach) - r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, group, 0); + r = cg_create_and_attach(controller, group, 0); else - r = cg_create(SYSTEMD_CGROUP_CONTROLLER, group); + r = cg_create(controller, group); if (r < 0) { pam_syslog(handle, LOG_ERR, "Failed to create cgroup: %s", strerror(-r)); @@ -253,8 +295,8 @@ static int create_user_group(pam_handle_t *handle, const char *group, struct pas } } - if ((r = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0 || - (r = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, group, 0755, pw->pw_uid, pw->pw_gid)) < 0) { + if ((r = cg_set_task_access(controller, group, 0644, pw->pw_uid, pw->pw_gid)) < 0 || + (r = cg_set_group_access(controller, group, 0755, pw->pw_uid, pw->pw_gid)) < 0) { pam_syslog(handle, LOG_ERR, "Failed to change access modes: %s", strerror(-r)); return PAM_SESSION_ERR; } @@ -273,18 +315,19 @@ _public_ PAM_EXTERN int pam_sm_open_session( char *buf = NULL; int lock_fd = -1; bool create_session = true; + char **controllers = NULL, **c; assert(handle); /* pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); */ - if (parse_argv(handle, argc, argv, &create_session, NULL, NULL) < 0) - return PAM_SESSION_ERR; - /* Make this a NOP on non-systemd systems */ if (sd_booted() <= 0) return PAM_SUCCESS; + if (parse_argv(handle, argc, argv, &create_session, NULL, NULL, &controllers) < 0) + return PAM_SESSION_ERR; + if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS) goto finish; @@ -362,9 +405,14 @@ _public_ PAM_EXTERN int pam_sm_open_session( pam_syslog(handle, LOG_INFO, "Moving new user session for %s into control group %s.", username, buf); - if ((r = create_user_group(handle, buf, pw, true, true)) != PAM_SUCCESS) + if ((r = create_user_group(handle, SYSTEMD_CGROUP_CONTROLLER, buf, pw, true, true)) != PAM_SUCCESS) goto finish; + /* The additional controllers don't really matter, so we + * ignore the return value */ + STRV_FOREACH(c, controllers) + create_user_group(handle, *c, buf, pw, true, false); + r = PAM_SUCCESS; finish: @@ -373,6 +421,8 @@ finish: if (lock_fd >= 0) close_nointr_nofail(lock_fd); + strv_free(controllers); + return r; } @@ -415,16 +465,17 @@ _public_ PAM_EXTERN int pam_sm_close_session( const char *id; struct passwd *pw; const void *created = NULL; + char **controllers = NULL, **c; assert(handle); - if (parse_argv(handle, argc, argv, NULL, &kill_session, &kill_user) < 0) - return PAM_SESSION_ERR; - /* Make this a NOP on non-systemd systems */ if (sd_booted() <= 0) return PAM_SUCCESS; + if (parse_argv(handle, argc, argv, NULL, &kill_session, &kill_user, &controllers) < 0) + return PAM_SESSION_ERR; + if ((r = get_user_data(handle, &username, &pw)) != PAM_SUCCESS) goto finish; @@ -438,6 +489,10 @@ _public_ PAM_EXTERN int pam_sm_close_session( if ((r = cg_attach(SYSTEMD_CGROUP_CONTROLLER, "/user", 0)) < 0) pam_syslog(handle, LOG_ERR, "Failed to move us away: %s", strerror(-r)); + STRV_FOREACH(c, controllers) + if ((r = cg_attach(*c, "/user", 0)) < 0) + pam_syslog(handle, LOG_ERR, "Failed to move us away in %s hierarchy: %s", *c, strerror(-r)); + if (asprintf(&user_path, "/user/%s", username) < 0) { r = PAM_BUF_ERR; goto finish; @@ -466,11 +521,18 @@ _public_ PAM_EXTERN int pam_sm_close_session( * cgroup. First, try to create the user group * in case it doesn't exist yet. Also, delete * the session group. */ - create_user_group(handle, nosession_path, pw, false, false); + create_user_group(handle, SYSTEMD_CGROUP_CONTROLLER, nosession_path, pw, false, false); if ((r = cg_migrate_recursive(SYSTEMD_CGROUP_CONTROLLER, session_path, nosession_path, false, true)) < 0) pam_syslog(handle, LOG_ERR, "Failed to migrate session cgroup: %s", strerror(-r)); } + + STRV_FOREACH(c, controllers) { + create_user_group(handle, *c, nosession_path, pw, false, false); + + if ((r = cg_migrate_recursive(*c, session_path, nosession_path, false, true)) < 0) + pam_syslog(handle, LOG_ERR, "Failed to migrate session cgroup in hierarchy %s: %s", *c, strerror(-r)); + } } /* GC user tree */ @@ -500,6 +562,9 @@ _public_ PAM_EXTERN int pam_sm_close_session( r = -EBUSY; } + STRV_FOREACH(c, controllers) + cg_trim(*c, user_path, true); + if (r >= 0) { const char *runtime_dir; @@ -520,5 +585,7 @@ finish: free(nosession_path); free(user_path); + strv_free(controllers); + return r; } -- 2.30.2