X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fexecute.c;h=ee05e994450de54375aec6229097790fdcc7d840;hp=6db048c5fce1d669981de7c5dd9d314c1e0b3e95;hb=b925e72633bf98438f56a140520e07ec8c959e46;hpb=0e098b15c76e222f7de381203c0c35a75a5b2f24 diff --git a/src/execute.c b/src/execute.c index 6db048c5f..ee05e9944 100644 --- a/src/execute.c +++ b/src/execute.c @@ -54,6 +54,7 @@ #include "tcpwrap.h" #include "exit-status.h" #include "missing.h" +#include "utmp-wtmp.h" /* This assumes there is a 'tty' group */ #define TTY_MODE 0620 @@ -197,7 +198,10 @@ static int connect_logger_as(const ExecContext *context, ExecOutput output, cons "%i\n" "%s\n" "%i\n", - output == EXEC_OUTPUT_KMSG ? "kmsg" : "syslog", + output == EXEC_OUTPUT_KMSG ? "kmsg" : + output == EXEC_OUTPUT_KMSG_AND_CONSOLE ? "kmsg+console" : + output == EXEC_OUTPUT_SYSLOG ? "syslog" : + "syslog+console", context->syslog_priority, context->syslog_identifier ? context->syslog_identifier : ident, context->syslog_level_prefix); @@ -337,7 +341,9 @@ static int setup_output(const ExecContext *context, int socket_fd, const char *i return open_terminal_as(tty_path(context), O_WRONLY, STDOUT_FILENO); case EXEC_OUTPUT_SYSLOG: + case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: case EXEC_OUTPUT_KMSG: + case EXEC_OUTPUT_KMSG_AND_CONSOLE: return connect_logger_as(context, o, ident, STDOUT_FILENO); case EXEC_OUTPUT_SOCKET: @@ -388,7 +394,9 @@ static int setup_error(const ExecContext *context, int socket_fd, const char *id return open_terminal_as(tty_path(context), O_WRONLY, STDERR_FILENO); case EXEC_OUTPUT_SYSLOG: + case EXEC_OUTPUT_SYSLOG_AND_CONSOLE: case EXEC_OUTPUT_KMSG: + case EXEC_OUTPUT_KMSG_AND_CONSOLE: return connect_logger_as(context, e, ident, STDERR_FILENO); case EXEC_OUTPUT_SOCKET: @@ -584,7 +592,7 @@ static int get_user_creds(const char **username, uid_t *uid, gid_t *gid, const c /* If there are multiple users with the same id, make * sure to leave $USER to the configured value instead - * of the first occurence in the database. However if + * of the first occurrence in the database. However if * the uid was configured by a numeric uid, then let's * pick the real username from /etc/passwd. */ if (*username && p) @@ -609,7 +617,7 @@ static int enforce_groups(const ExecContext *context, const char *username, gid_ assert(context); - /* Lookup and ser GID and supplementary group list. Here too + /* Lookup and set GID and supplementary group list. Here too * we avoid NSS lookups for gid=0. */ if (context->group || username) { @@ -692,7 +700,7 @@ static int enforce_user(const ExecContext *context, uid_t uid) { /* First step: If we need to keep capabilities but * drop privileges we need to make sure we keep our - * caps, whiel we drop priviliges. */ + * caps, whiel we drop privileges. */ if (uid != 0) { int sb = context->secure_bits|SECURE_KEEP_CAPS; @@ -701,7 +709,7 @@ static int enforce_user(const ExecContext *context, uid_t uid) { return -errno; } - /* Second step: set the capabilites. This will reduce + /* Second step: set the capabilities. This will reduce * the capabilities to the minimum we need. */ if (!(d = cap_dup(context->capabilities))) @@ -772,7 +780,7 @@ static int setup_pam( assert(pam_env); /* We set up PAM in the parent process, then fork. The child - * will then stay around untill killed via PR_GET_PDEATHSIG or + * will then stay around until killed via PR_GET_PDEATHSIG or * systemd via the cgroup logic. It will then remove the PAM * session again. The parent process will exec() the actual * daemon. We do things this way to ensure that the main PID @@ -833,7 +841,7 @@ static int setup_pam( /* Wait until our parent died. This will most likely * not work since the kernel does not allow - * unpriviliged paretns kill their priviliged children + * unprivileged parents kill their privileged children * this way. We rely on the control groups kill logic * to do the rest for us. */ if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) @@ -886,8 +894,10 @@ fail: closelog(); - if (pam_pid > 1) + if (pam_pid > 1) { kill(pam_pid, SIGTERM); + kill(pam_pid, SIGCONT); + } return EXIT_PAM; } @@ -909,6 +919,7 @@ int exec_spawn(ExecCommand *command, int r; char *line; int socket_fd; + char **files_env = NULL; assert(command); assert(context); @@ -929,21 +940,30 @@ int exec_spawn(ExecCommand *command, } else socket_fd = -1; + if ((r = exec_context_load_environment(context, &files_env)) < 0) { + log_error("Failed to load environment files: %s", strerror(-r)); + return r; + } + if (!argv) argv = command->argv; - if (!(line = exec_command_line(argv))) - return -ENOMEM; + if (!(line = exec_command_line(argv))) { + r = -ENOMEM; + goto fail_parent; + } log_debug("About to execute: %s", line); free(line); if (cgroup_bondings) if ((r = cgroup_bonding_realize_list(cgroup_bondings))) - return r; + goto fail_parent; - if ((pid = fork()) < 0) - return -errno; + if ((pid = fork()) < 0) { + r = -errno; + goto fail_parent; + } if (pid == 0) { int i; @@ -973,7 +993,7 @@ int exec_spawn(ExecCommand *command, if (sigemptyset(&ss) < 0 || sigprocmask(SIG_SETMASK, &ss, NULL) < 0) { r = EXIT_SIGNAL_MASK; - goto fail; + goto fail_child; } /* Close sockets very early to make sure we don't @@ -982,26 +1002,26 @@ int exec_spawn(ExecCommand *command, if (close_all_fds(socket_fd >= 0 ? &socket_fd : fds, socket_fd >= 0 ? 1 : n_fds) < 0) { r = EXIT_FDS; - goto fail; + goto fail_child; } if (!context->same_pgrp) if (setsid() < 0) { r = EXIT_SETSID; - goto fail; + goto fail_child; } if (context->tcpwrap_name) { if (socket_fd >= 0) if (!socket_tcpwrap(socket_fd, context->tcpwrap_name)) { r = EXIT_TCPWRAP; - goto fail; + goto fail_child; } for (i = 0; i < (int) n_fds; i++) { if (!socket_tcpwrap(fds[i], context->tcpwrap_name)) { r = EXIT_TCPWRAP; - goto fail; + goto fail_child; } } } @@ -1014,12 +1034,12 @@ int exec_spawn(ExecCommand *command, /* Set up terminal for the question */ if ((r = setup_confirm_stdio(context, &saved_stdin, &saved_stdout))) - goto fail; + goto fail_child; /* Now ask the question. */ if (!(line = exec_command_line(argv))) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } r = ask(&response, "yns", "Execute %s? [Yes, No, Skip] ", line); @@ -1027,17 +1047,17 @@ int exec_spawn(ExecCommand *command, if (r < 0 || response == 'n') { r = EXIT_CONFIRM; - goto fail; + goto fail_child; } else if (response == 's') { r = 0; - goto fail; + goto fail_child; } /* Release terminal for the question */ if ((r = restore_confirm_stdio(context, &saved_stdin, &saved_stdout, &keep_stdin, &keep_stdout))) - goto fail; + goto fail_child; } /* If a socket is connected to STDIN/STDOUT/STDERR, we @@ -1048,24 +1068,24 @@ int exec_spawn(ExecCommand *command, if (!keep_stdin) if (setup_input(context, socket_fd, apply_tty_stdin) < 0) { r = EXIT_STDIN; - goto fail; + goto fail_child; } if (!keep_stdout) if (setup_output(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) { r = EXIT_STDOUT; - goto fail; + goto fail_child; } if (setup_error(context, socket_fd, file_name_from_path(command->path), apply_tty_stdin) < 0) { r = EXIT_STDERR; - goto fail; + goto fail_child; } if (cgroup_bondings) if (cgroup_bonding_install_list(cgroup_bondings, 0) < 0) { r = EXIT_CGROUP; - goto fail; + goto fail_child; } if (context->oom_score_adjust_set) { @@ -1087,7 +1107,7 @@ int exec_spawn(ExecCommand *command, if (write_one_line_file("/proc/self/oom_adj", t) < 0) { r = EXIT_OOM_ADJUST; - goto fail; + goto fail_child; } } } @@ -1095,7 +1115,7 @@ int exec_spawn(ExecCommand *command, if (context->nice_set) if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) { r = EXIT_NICE; - goto fail; + goto fail_child; } if (context->cpu_sched_set) { @@ -1107,39 +1127,42 @@ int exec_spawn(ExecCommand *command, if (sched_setscheduler(0, context->cpu_sched_policy | (context->cpu_sched_reset_on_fork ? SCHED_RESET_ON_FORK : 0), ¶m) < 0) { r = EXIT_SETSCHEDULER; - goto fail; + goto fail_child; } } if (context->cpuset) if (sched_setaffinity(0, CPU_ALLOC_SIZE(context->cpuset_ncpus), context->cpuset) < 0) { r = EXIT_CPUAFFINITY; - goto fail; + goto fail_child; } if (context->ioprio_set) if (ioprio_set(IOPRIO_WHO_PROCESS, 0, context->ioprio) < 0) { r = EXIT_IOPRIO; - goto fail; + goto fail_child; } if (context->timer_slack_nsec_set) if (prctl(PR_SET_TIMERSLACK, context->timer_slack_nsec) < 0) { r = EXIT_TIMERSLACK; - goto fail; + goto fail_child; } + if (context->utmp_id) + utmp_put_init_process(0, context->utmp_id, getpid(), getsid(0), context->tty_path); + if (context->user) { username = context->user; if (get_user_creds(&username, &uid, &gid, &home) < 0) { r = EXIT_USER; - goto fail; + goto fail_child; } if (is_terminal_input(context->std_input)) if (chown_terminal(STDIN_FILENO, uid) < 0) { r = EXIT_STDIN; - goto fail; + goto fail_child; } } @@ -1147,7 +1170,7 @@ int exec_spawn(ExecCommand *command, if (context->pam_name && username) { if (setup_pam(context->pam_name, username, context->tty_path, &pam_env, fds, n_fds) < 0) { r = EXIT_PAM; - goto fail; + goto fail_child; } } #endif @@ -1155,7 +1178,7 @@ int exec_spawn(ExecCommand *command, if (apply_permissions) if (enforce_groups(context, username, uid) < 0) { r = EXIT_GROUP; - goto fail; + goto fail_child; } umask(context->umask); @@ -1171,18 +1194,18 @@ int exec_spawn(ExecCommand *command, context->inaccessible_dirs, context->private_tmp, context->mount_flags)) < 0) - goto fail; + goto fail_child; if (apply_chroot) { if (context->root_directory) if (chroot(context->root_directory) < 0) { r = EXIT_CHROOT; - goto fail; + goto fail_child; } if (chdir(context->working_directory ? context->working_directory : "/") < 0) { r = EXIT_CHDIR; - goto fail; + goto fail_child; } } else { @@ -1192,13 +1215,13 @@ int exec_spawn(ExecCommand *command, context->root_directory ? context->root_directory : "", context->working_directory ? context->working_directory : "") < 0) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } if (chdir(d) < 0) { free(d); r = EXIT_CHDIR; - goto fail; + goto fail_child; } free(d); @@ -1210,7 +1233,7 @@ int exec_spawn(ExecCommand *command, shift_fds(fds, n_fds) < 0 || flags_fds(fds, n_fds, context->non_blocking) < 0) { r = EXIT_FDS; - goto fail; + goto fail_child; } if (apply_permissions) { @@ -1221,83 +1244,95 @@ int exec_spawn(ExecCommand *command, if (setrlimit(i, context->rlimit[i]) < 0) { r = EXIT_LIMITS; - goto fail; + goto fail_child; } } if (context->user) if (enforce_user(context, uid) < 0) { r = EXIT_USER; - goto fail; + goto fail_child; } - /* PR_GET_SECUREBITS is not priviliged, while + /* PR_GET_SECUREBITS is not privileged, while * PR_SET_SECUREBITS is. So to suppress * potential EPERMs we'll try not to call * PR_SET_SECUREBITS unless necessary. */ if (prctl(PR_GET_SECUREBITS) != context->secure_bits) if (prctl(PR_SET_SECUREBITS, context->secure_bits) < 0) { r = EXIT_SECUREBITS; - goto fail; + goto fail_child; } if (context->capabilities) if (cap_set_proc(context->capabilities) < 0) { r = EXIT_CAPABILITIES; - goto fail; + goto fail_child; } } - if (!(our_env = new0(char*, 6))) { + if (!(our_env = new0(char*, 7))) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } if (n_fds > 0) if (asprintf(our_env + n_env++, "LISTEN_PID=%lu", (unsigned long) getpid()) < 0 || asprintf(our_env + n_env++, "LISTEN_FDS=%u", n_fds) < 0) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } if (home) if (asprintf(our_env + n_env++, "HOME=%s", home) < 0) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } if (username) if (asprintf(our_env + n_env++, "LOGNAME=%s", username) < 0 || asprintf(our_env + n_env++, "USER=%s", username) < 0) { r = EXIT_MEMORY; - goto fail; + goto fail_child; + } + + if (is_terminal_input(context->std_input) || + context->std_output == EXEC_OUTPUT_TTY || + context->std_error == EXEC_OUTPUT_TTY) + if (!(our_env[n_env++] = strdup(default_term_for_tty(tty_path(context))))) { + r = EXIT_MEMORY; + goto fail_child; } - assert(n_env <= 6); + assert(n_env <= 7); if (!(final_env = strv_env_merge( - 4, + 5, environment, our_env, context->environment, + files_env, pam_env, NULL))) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } if (!(final_argv = replace_env_argv(argv, final_env))) { r = EXIT_MEMORY; - goto fail; + goto fail_child; } + final_env = strv_env_clean(final_env); + execve(command->path, final_argv, final_env); r = EXIT_EXEC; - fail: + fail_child: strv_free(our_env); strv_free(final_env); strv_free(pam_env); + strv_free(files_env); strv_free(final_argv); if (saved_stdin >= 0) @@ -1309,6 +1344,8 @@ int exec_spawn(ExecCommand *command, _exit(r); } + strv_free(files_env); + /* We add the new process to the cgroup both in the child (so * that we can be sure that no user code is ever executed * outside of the cgroup) and in the parent (so that we can be @@ -1323,6 +1360,11 @@ int exec_spawn(ExecCommand *command, *ret = pid; return 0; + +fail_parent: + strv_free(files_env); + + return r; } void exec_context_init(ExecContext *c) { @@ -1335,6 +1377,7 @@ void exec_context_init(ExecContext *c) { c->syslog_level_prefix = true; c->mount_flags = MS_SHARED; c->kill_signal = SIGTERM; + c->send_sigkill = true; } void exec_context_done(ExecContext *c) { @@ -1345,6 +1388,9 @@ void exec_context_done(ExecContext *c) { strv_free(c->environment); c->environment = NULL; + strv_free(c->environment_files); + c->environment_files = NULL; + for (l = 0; l < ELEMENTSOF(c->rlimit); l++) { free(c->rlimit[l]); c->rlimit[l] = NULL; @@ -1392,6 +1438,9 @@ void exec_context_done(ExecContext *c) { if (c->cpuset) CPU_FREE(c->cpuset); + + free(c->utmp_id); + c->utmp_id = NULL; } void exec_command_done(ExecCommand *c) { @@ -1430,6 +1479,64 @@ void exec_command_free_array(ExecCommand **c, unsigned n) { } } +int exec_context_load_environment(const ExecContext *c, char ***l) { + char **i, **r = NULL; + + assert(c); + assert(l); + + STRV_FOREACH(i, c->environment_files) { + char *fn; + int k; + bool ignore = false; + char **p; + + fn = *i; + + if (fn[0] == '-') { + ignore = true; + fn ++; + } + + if (!path_is_absolute(fn)) { + + if (ignore) + continue; + + strv_free(r); + return -EINVAL; + } + + if ((k = load_env_file(fn, &p)) < 0) { + + if (ignore) + continue; + + strv_free(r); + return k; + } + + if (r == NULL) + r = p; + else { + char **m; + + m = strv_env_merge(2, r, p); + strv_free(r); + strv_free(p); + + if (!m) + return -ENOMEM; + + r = m; + } + } + + *l = r; + + return 0; +} + static void strv_fprintf(FILE *f, char **l) { char **g; @@ -1461,9 +1568,11 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { prefix, yes_no(c->non_blocking), prefix, yes_no(c->private_tmp)); - if (c->environment) - for (e = c->environment; *e; e++) - fprintf(f, "%sEnvironment: %s\n", prefix, *e); + STRV_FOREACH(e, c->environment) + fprintf(f, "%sEnvironment: %s\n", prefix, *e); + + STRV_FOREACH(e, c->environment_files) + fprintf(f, "%sEnvironmentFile: %s\n", prefix, *e); if (c->tcpwrap_name) fprintf(f, @@ -1525,7 +1634,9 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { prefix, c->tty_path); if (c->std_output == EXEC_OUTPUT_SYSLOG || c->std_output == EXEC_OUTPUT_KMSG || - c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG) + c->std_output == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_output == EXEC_OUTPUT_KMSG_AND_CONSOLE || + c->std_error == EXEC_OUTPUT_SYSLOG || c->std_error == EXEC_OUTPUT_KMSG || + c->std_error == EXEC_OUTPUT_SYSLOG_AND_CONSOLE || c->std_error == EXEC_OUTPUT_KMSG_AND_CONSOLE) fprintf(f, "%sSyslogFacility: %s\n" "%sSyslogLevel: %s\n", @@ -1601,9 +1712,16 @@ void exec_context_dump(ExecContext *c, FILE* f, const char *prefix) { fprintf(f, "%sKillMode: %s\n" - "%sKillSignal: SIG%s\n", + "%sKillSignal: SIG%s\n" + "%sSendSIGKILL: %s\n", prefix, kill_mode_to_string(c->kill_mode), - prefix, signal_to_string(c->kill_signal)); + prefix, signal_to_string(c->kill_signal), + prefix, yes_no(c->send_sigkill)); + + if (c->utmp_id) + fprintf(f, + "%sUtmpIdentifier: %s\n", + prefix, c->utmp_id); } void exec_status_start(ExecStatus *s, pid_t pid) { @@ -1614,7 +1732,7 @@ void exec_status_start(ExecStatus *s, pid_t pid) { dual_timestamp_get(&s->start_timestamp); } -void exec_status_exit(ExecStatus *s, pid_t pid, int code, int status) { +void exec_status_exit(ExecStatus *s, pid_t pid, int code, int status, const char *utmp_id) { assert(s); if ((s->pid && s->pid != pid) || @@ -1626,6 +1744,9 @@ void exec_status_exit(ExecStatus *s, pid_t pid, int code, int status) { s->code = code; s->status = status; + + if (utmp_id) + utmp_put_dead_process(utmp_id, pid, code, status); } void exec_status_dump(ExecStatus *s, FILE *f, const char *prefix) { @@ -1742,7 +1863,7 @@ void exec_command_append_list(ExecCommand **l, ExecCommand *e) { assert(e); if (*l) { - /* It's kinda important that we keep the order here */ + /* It's kind of important, that we keep the order here */ LIST_FIND_TAIL(ExecCommand, command, *l, end); LIST_INSERT_AFTER(ExecCommand, command, *l, end, e); } else @@ -1785,15 +1906,34 @@ static const char* const exec_input_table[_EXEC_INPUT_MAX] = { [EXEC_INPUT_SOCKET] = "socket" }; +DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); + static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = { [EXEC_OUTPUT_INHERIT] = "inherit", [EXEC_OUTPUT_NULL] = "null", [EXEC_OUTPUT_TTY] = "tty", [EXEC_OUTPUT_SYSLOG] = "syslog", + [EXEC_OUTPUT_SYSLOG_AND_CONSOLE] = "syslog+console", [EXEC_OUTPUT_KMSG] = "kmsg", + [EXEC_OUTPUT_KMSG_AND_CONSOLE] = "kmsg+console", [EXEC_OUTPUT_SOCKET] = "socket" }; DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput); -DEFINE_STRING_TABLE_LOOKUP(exec_input, ExecInput); +static const char* const kill_mode_table[_KILL_MODE_MAX] = { + [KILL_CONTROL_GROUP] = "control-group", + [KILL_PROCESS_GROUP] = "process-group", + [KILL_PROCESS] = "process", + [KILL_NONE] = "none" +}; + +DEFINE_STRING_TABLE_LOOKUP(kill_mode, KillMode); + +static const char* const kill_who_table[_KILL_WHO_MAX] = { + [KILL_MAIN] = "main", + [KILL_CONTROL] = "control", + [KILL_ALL] = "all" +}; + +DEFINE_STRING_TABLE_LOOKUP(kill_who, KillWho);