| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Lennart Poettering |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <stdlib.h> |
| #include <linux/capability.h> |
| |
| #include "util.h" |
| #include "formats-util.h" |
| #include "process-util.h" |
| #include "terminal-util.h" |
| #include "capability.h" |
| #include "cgroup-util.h" |
| #include "fileio.h" |
| #include "audit.h" |
| #include "bus-message.h" |
| #include "bus-util.h" |
| #include "strv.h" |
| #include "bus-creds.h" |
| #include "bus-label.h" |
| |
| enum { |
| CAP_OFFSET_INHERITABLE = 0, |
| CAP_OFFSET_PERMITTED = 1, |
| CAP_OFFSET_EFFECTIVE = 2, |
| CAP_OFFSET_BOUNDING = 3 |
| }; |
| |
| void bus_creds_done(sd_bus_creds *c) { |
| assert(c); |
| |
| /* For internal bus cred structures that are allocated by |
| * something else */ |
| |
| free(c->session); |
| free(c->unit); |
| free(c->user_unit); |
| free(c->slice); |
| free(c->user_slice); |
| free(c->unescaped_description); |
| free(c->supplementary_gids); |
| free(c->tty); |
| |
| free(c->well_known_names); /* note that this is an strv, but |
| * we only free the array, not the |
| * strings the array points to. The |
| * full strv we only free if |
| * c->allocated is set, see |
| * below. */ |
| |
| strv_free(c->cmdline_array); |
| } |
| |
| _public_ sd_bus_creds *sd_bus_creds_ref(sd_bus_creds *c) { |
| assert_return(c, NULL); |
| |
| if (c->allocated) { |
| assert(c->n_ref > 0); |
| c->n_ref++; |
| } else { |
| sd_bus_message *m; |
| |
| /* If this is an embedded creds structure, then |
| * forward ref counting to the message */ |
| m = container_of(c, sd_bus_message, creds); |
| sd_bus_message_ref(m); |
| } |
| |
| return c; |
| } |
| |
| _public_ sd_bus_creds *sd_bus_creds_unref(sd_bus_creds *c) { |
| |
| if (!c) |
| return NULL; |
| |
| if (c->allocated) { |
| assert(c->n_ref > 0); |
| c->n_ref--; |
| |
| if (c->n_ref == 0) { |
| free(c->comm); |
| free(c->tid_comm); |
| free(c->exe); |
| free(c->cmdline); |
| free(c->cgroup); |
| free(c->capability); |
| free(c->label); |
| free(c->unique_name); |
| free(c->cgroup_root); |
| free(c->description); |
| |
| free(c->supplementary_gids); |
| c->supplementary_gids = NULL; |
| |
| strv_free(c->well_known_names); |
| c->well_known_names = NULL; |
| |
| bus_creds_done(c); |
| |
| free(c); |
| } |
| } else { |
| sd_bus_message *m; |
| |
| m = container_of(c, sd_bus_message, creds); |
| sd_bus_message_unref(m); |
| } |
| |
| |
| return NULL; |
| } |
| |
| _public_ uint64_t sd_bus_creds_get_mask(const sd_bus_creds *c) { |
| assert_return(c, 0); |
| |
| return c->mask; |
| } |
| |
| _public_ uint64_t sd_bus_creds_get_augmented_mask(const sd_bus_creds *c) { |
| assert_return(c, 0); |
| |
| return c->augmented; |
| } |
| |
| sd_bus_creds* bus_creds_new(void) { |
| sd_bus_creds *c; |
| |
| c = new0(sd_bus_creds, 1); |
| if (!c) |
| return NULL; |
| |
| c->allocated = true; |
| c->n_ref = 1; |
| return c; |
| } |
| |
| _public_ int sd_bus_creds_new_from_pid(sd_bus_creds **ret, pid_t pid, uint64_t mask) { |
| sd_bus_creds *c; |
| int r; |
| |
| assert_return(pid >= 0, -EINVAL); |
| assert_return(mask <= _SD_BUS_CREDS_ALL, -EOPNOTSUPP); |
| assert_return(ret, -EINVAL); |
| |
| if (pid == 0) |
| pid = getpid(); |
| |
| c = bus_creds_new(); |
| if (!c) |
| return -ENOMEM; |
| |
| r = bus_creds_add_more(c, mask | SD_BUS_CREDS_AUGMENT, pid, 0); |
| if (r < 0) { |
| sd_bus_creds_unref(c); |
| return r; |
| } |
| |
| /* Check if the process existed at all, in case we haven't |
| * figured that out already */ |
| if (!pid_is_alive(pid)) { |
| sd_bus_creds_unref(c); |
| return -ESRCH; |
| } |
| |
| *ret = c; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_uid(sd_bus_creds *c, uid_t *uid) { |
| assert_return(c, -EINVAL); |
| assert_return(uid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_UID)) |
| return -ENODATA; |
| |
| *uid = c->uid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_euid(sd_bus_creds *c, uid_t *euid) { |
| assert_return(c, -EINVAL); |
| assert_return(euid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_EUID)) |
| return -ENODATA; |
| |
| *euid = c->euid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_suid(sd_bus_creds *c, uid_t *suid) { |
| assert_return(c, -EINVAL); |
| assert_return(suid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SUID)) |
| return -ENODATA; |
| |
| *suid = c->suid; |
| return 0; |
| } |
| |
| |
| _public_ int sd_bus_creds_get_fsuid(sd_bus_creds *c, uid_t *fsuid) { |
| assert_return(c, -EINVAL); |
| assert_return(fsuid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_FSUID)) |
| return -ENODATA; |
| |
| *fsuid = c->fsuid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_gid(sd_bus_creds *c, gid_t *gid) { |
| assert_return(c, -EINVAL); |
| assert_return(gid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_GID)) |
| return -ENODATA; |
| |
| *gid = c->gid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_egid(sd_bus_creds *c, gid_t *egid) { |
| assert_return(c, -EINVAL); |
| assert_return(egid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_EGID)) |
| return -ENODATA; |
| |
| *egid = c->egid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_sgid(sd_bus_creds *c, gid_t *sgid) { |
| assert_return(c, -EINVAL); |
| assert_return(sgid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SGID)) |
| return -ENODATA; |
| |
| *sgid = c->sgid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_fsgid(sd_bus_creds *c, gid_t *fsgid) { |
| assert_return(c, -EINVAL); |
| assert_return(fsgid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_FSGID)) |
| return -ENODATA; |
| |
| *fsgid = c->fsgid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_supplementary_gids(sd_bus_creds *c, const gid_t **gids) { |
| assert_return(c, -EINVAL); |
| assert_return(gids, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS)) |
| return -ENODATA; |
| |
| *gids = c->supplementary_gids; |
| return (int) c->n_supplementary_gids; |
| } |
| |
| _public_ int sd_bus_creds_get_pid(sd_bus_creds *c, pid_t *pid) { |
| assert_return(c, -EINVAL); |
| assert_return(pid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_PID)) |
| return -ENODATA; |
| |
| assert(c->pid > 0); |
| *pid = c->pid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_ppid(sd_bus_creds *c, pid_t *ppid) { |
| assert_return(c, -EINVAL); |
| assert_return(ppid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_PPID)) |
| return -ENODATA; |
| |
| /* PID 1 has no parent process. Let's distinguish the case of |
| * not knowing and not having a parent process by the returned |
| * error code. */ |
| if (c->ppid == 0) |
| return -ENXIO; |
| |
| *ppid = c->ppid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_tid(sd_bus_creds *c, pid_t *tid) { |
| assert_return(c, -EINVAL); |
| assert_return(tid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_TID)) |
| return -ENODATA; |
| |
| assert(c->tid > 0); |
| *tid = c->tid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_selinux_context(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SELINUX_CONTEXT)) |
| return -ENODATA; |
| |
| assert(c->label); |
| *ret = c->label; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_comm(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_COMM)) |
| return -ENODATA; |
| |
| assert(c->comm); |
| *ret = c->comm; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_tid_comm(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_TID_COMM)) |
| return -ENODATA; |
| |
| assert(c->tid_comm); |
| *ret = c->tid_comm; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_exe(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_EXE)) |
| return -ENODATA; |
| |
| if (!c->exe) |
| return -ENXIO; |
| |
| *ret = c->exe; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_cgroup(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_CGROUP)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| *ret = c->cgroup; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_unit(sd_bus_creds *c, const char **ret) { |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_UNIT)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| if (!c->unit) { |
| const char *shifted; |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| r = cg_path_get_unit(shifted, (char**) &c->unit); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = c->unit; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_user_unit(sd_bus_creds *c, const char **ret) { |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_USER_UNIT)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| if (!c->user_unit) { |
| const char *shifted; |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| r = cg_path_get_user_unit(shifted, (char**) &c->user_unit); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = c->user_unit; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_slice(sd_bus_creds *c, const char **ret) { |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SLICE)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| if (!c->slice) { |
| const char *shifted; |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| r = cg_path_get_slice(shifted, (char**) &c->slice); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = c->slice; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_user_slice(sd_bus_creds *c, const char **ret) { |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_USER_SLICE)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| if (!c->user_slice) { |
| const char *shifted; |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| r = cg_path_get_user_slice(shifted, (char**) &c->user_slice); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = c->user_slice; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_session(sd_bus_creds *c, const char **ret) { |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_SESSION)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| if (!c->session) { |
| const char *shifted; |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| r = cg_path_get_session(shifted, (char**) &c->session); |
| if (r < 0) |
| return r; |
| } |
| |
| *ret = c->session; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_owner_uid(sd_bus_creds *c, uid_t *uid) { |
| const char *shifted; |
| int r; |
| |
| assert_return(c, -EINVAL); |
| assert_return(uid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_OWNER_UID)) |
| return -ENODATA; |
| |
| assert(c->cgroup); |
| |
| r = cg_shift_path(c->cgroup, c->cgroup_root, &shifted); |
| if (r < 0) |
| return r; |
| |
| return cg_path_get_owner_uid(shifted, uid); |
| } |
| |
| _public_ int sd_bus_creds_get_cmdline(sd_bus_creds *c, char ***cmdline) { |
| assert_return(c, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_CMDLINE)) |
| return -ENODATA; |
| |
| if (!c->cmdline) |
| return -ENXIO; |
| |
| if (!c->cmdline_array) { |
| c->cmdline_array = strv_parse_nulstr(c->cmdline, c->cmdline_size); |
| if (!c->cmdline_array) |
| return -ENOMEM; |
| } |
| |
| *cmdline = c->cmdline_array; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_audit_session_id(sd_bus_creds *c, uint32_t *sessionid) { |
| assert_return(c, -EINVAL); |
| assert_return(sessionid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_AUDIT_SESSION_ID)) |
| return -ENODATA; |
| |
| if (c->audit_session_id == AUDIT_SESSION_INVALID) |
| return -ENXIO; |
| |
| *sessionid = c->audit_session_id; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_audit_login_uid(sd_bus_creds *c, uid_t *uid) { |
| assert_return(c, -EINVAL); |
| assert_return(uid, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_AUDIT_LOGIN_UID)) |
| return -ENODATA; |
| |
| if (c->audit_login_uid == UID_INVALID) |
| return -ENXIO; |
| |
| *uid = c->audit_login_uid; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_tty(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_TTY)) |
| return -ENODATA; |
| |
| if (!c->tty) |
| return -ENXIO; |
| |
| *ret = c->tty; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_unique_name(sd_bus_creds *c, const char **unique_name) { |
| assert_return(c, -EINVAL); |
| assert_return(unique_name, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_UNIQUE_NAME)) |
| return -ENODATA; |
| |
| *unique_name = c->unique_name; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_well_known_names(sd_bus_creds *c, char ***well_known_names) { |
| assert_return(c, -EINVAL); |
| assert_return(well_known_names, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_WELL_KNOWN_NAMES)) |
| return -ENODATA; |
| |
| /* As a special hack we return the bus driver as well-known |
| * names list when this is requested. */ |
| if (c->well_known_names_driver) { |
| static const char* const wkn[] = { |
| "org.freedesktop.DBus", |
| NULL |
| }; |
| |
| *well_known_names = (char**) wkn; |
| return 0; |
| } |
| |
| if (c->well_known_names_local) { |
| static const char* const wkn[] = { |
| "org.freedesktop.DBus.Local", |
| NULL |
| }; |
| |
| *well_known_names = (char**) wkn; |
| return 0; |
| } |
| |
| *well_known_names = c->well_known_names; |
| return 0; |
| } |
| |
| _public_ int sd_bus_creds_get_description(sd_bus_creds *c, const char **ret) { |
| assert_return(c, -EINVAL); |
| assert_return(ret, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_DESCRIPTION)) |
| return -ENODATA; |
| |
| assert(c->description); |
| |
| if (!c->unescaped_description) { |
| c->unescaped_description = bus_label_unescape(c->description); |
| if (!c->unescaped_description) |
| return -ENOMEM; |
| } |
| |
| *ret = c->unescaped_description; |
| return 0; |
| } |
| |
| static int has_cap(sd_bus_creds *c, unsigned offset, int capability) { |
| size_t sz; |
| |
| assert(c); |
| assert(capability >= 0); |
| assert(c->capability); |
| |
| if ((unsigned) capability > cap_last_cap()) |
| return 0; |
| |
| sz = DIV_ROUND_UP(cap_last_cap(), 32U); |
| |
| return !!(c->capability[offset * sz + CAP_TO_INDEX(capability)] & CAP_TO_MASK(capability)); |
| } |
| |
| _public_ int sd_bus_creds_has_effective_cap(sd_bus_creds *c, int capability) { |
| assert_return(c, -EINVAL); |
| assert_return(capability >= 0, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_EFFECTIVE_CAPS)) |
| return -ENODATA; |
| |
| return has_cap(c, CAP_OFFSET_EFFECTIVE, capability); |
| } |
| |
| _public_ int sd_bus_creds_has_permitted_cap(sd_bus_creds *c, int capability) { |
| assert_return(c, -EINVAL); |
| assert_return(capability >= 0, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_PERMITTED_CAPS)) |
| return -ENODATA; |
| |
| return has_cap(c, CAP_OFFSET_PERMITTED, capability); |
| } |
| |
| _public_ int sd_bus_creds_has_inheritable_cap(sd_bus_creds *c, int capability) { |
| assert_return(c, -EINVAL); |
| assert_return(capability >= 0, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_INHERITABLE_CAPS)) |
| return -ENODATA; |
| |
| return has_cap(c, CAP_OFFSET_INHERITABLE, capability); |
| } |
| |
| _public_ int sd_bus_creds_has_bounding_cap(sd_bus_creds *c, int capability) { |
| assert_return(c, -EINVAL); |
| assert_return(capability >= 0, -EINVAL); |
| |
| if (!(c->mask & SD_BUS_CREDS_BOUNDING_CAPS)) |
| return -ENODATA; |
| |
| return has_cap(c, CAP_OFFSET_BOUNDING, capability); |
| } |
| |
| static int parse_caps(sd_bus_creds *c, unsigned offset, const char *p) { |
| size_t sz, max; |
| unsigned i, j; |
| |
| assert(c); |
| assert(p); |
| |
| max = DIV_ROUND_UP(cap_last_cap(), 32U); |
| p += strspn(p, WHITESPACE); |
| |
| sz = strlen(p); |
| if (sz % 8 != 0) |
| return -EINVAL; |
| |
| sz /= 8; |
| if (sz > max) |
| return -EINVAL; |
| |
| if (!c->capability) { |
| c->capability = new0(uint32_t, max * 4); |
| if (!c->capability) |
| return -ENOMEM; |
| } |
| |
| for (i = 0; i < sz; i ++) { |
| uint32_t v = 0; |
| |
| for (j = 0; j < 8; ++j) { |
| int t; |
| |
| t = unhexchar(*p++); |
| if (t < 0) |
| return -EINVAL; |
| |
| v = (v << 4) | t; |
| } |
| |
| c->capability[offset * max + (sz - i - 1)] = v; |
| } |
| |
| return 0; |
| } |
| |
| int bus_creds_add_more(sd_bus_creds *c, uint64_t mask, pid_t pid, pid_t tid) { |
| uint64_t missing; |
| int r; |
| |
| assert(c); |
| assert(c->allocated); |
| |
| if (!(mask & SD_BUS_CREDS_AUGMENT)) |
| return 0; |
| |
| /* Try to retrieve PID from creds if it wasn't passed to us */ |
| if (pid > 0) { |
| c->pid = pid; |
| c->mask |= SD_BUS_CREDS_PID; |
| } else if (c->mask & SD_BUS_CREDS_PID) |
| pid = c->pid; |
| else |
| /* Without pid we cannot do much... */ |
| return 0; |
| |
| /* Try to retrieve TID from creds if it wasn't passed to us */ |
| if (tid <= 0 && (c->mask & SD_BUS_CREDS_TID)) |
| tid = c->tid; |
| |
| /* Calculate what we shall and can add */ |
| missing = mask & ~(c->mask|SD_BUS_CREDS_PID|SD_BUS_CREDS_TID|SD_BUS_CREDS_UNIQUE_NAME|SD_BUS_CREDS_WELL_KNOWN_NAMES|SD_BUS_CREDS_DESCRIPTION|SD_BUS_CREDS_AUGMENT); |
| if (missing == 0) |
| return 0; |
| |
| if (tid > 0) { |
| c->tid = tid; |
| c->mask |= SD_BUS_CREDS_TID; |
| } |
| |
| if (missing & (SD_BUS_CREDS_PPID | |
| SD_BUS_CREDS_UID | SD_BUS_CREDS_EUID | SD_BUS_CREDS_SUID | SD_BUS_CREDS_FSUID | |
| SD_BUS_CREDS_GID | SD_BUS_CREDS_EGID | SD_BUS_CREDS_SGID | SD_BUS_CREDS_FSGID | |
| SD_BUS_CREDS_SUPPLEMENTARY_GIDS | |
| SD_BUS_CREDS_EFFECTIVE_CAPS | SD_BUS_CREDS_INHERITABLE_CAPS | |
| SD_BUS_CREDS_PERMITTED_CAPS | SD_BUS_CREDS_BOUNDING_CAPS)) { |
| |
| _cleanup_fclose_ FILE *f = NULL; |
| const char *p; |
| |
| p = procfs_file_alloca(pid, "status"); |
| |
| f = fopen(p, "re"); |
| if (!f) { |
| if (errno == ENOENT) |
| return -ESRCH; |
| else if (errno != EPERM && errno != EACCES) |
| return -errno; |
| } else { |
| char line[LINE_MAX]; |
| |
| FOREACH_LINE(line, f, return -errno) { |
| truncate_nl(line); |
| |
| if (missing & SD_BUS_CREDS_PPID) { |
| p = startswith(line, "PPid:"); |
| if (p) { |
| p += strspn(p, WHITESPACE); |
| |
| /* Explicitly check for PPID 0 (which is the case for PID 1) */ |
| if (!streq(p, "0")) { |
| r = parse_pid(p, &c->ppid); |
| if (r < 0) |
| return r; |
| |
| } else |
| c->ppid = 0; |
| |
| c->mask |= SD_BUS_CREDS_PPID; |
| continue; |
| } |
| } |
| |
| if (missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID)) { |
| p = startswith(line, "Uid:"); |
| if (p) { |
| unsigned long uid, euid, suid, fsuid; |
| |
| p += strspn(p, WHITESPACE); |
| if (sscanf(p, "%lu %lu %lu %lu", &uid, &euid, &suid, &fsuid) != 4) |
| return -EIO; |
| |
| if (missing & SD_BUS_CREDS_UID) |
| c->uid = (uid_t) uid; |
| if (missing & SD_BUS_CREDS_EUID) |
| c->euid = (uid_t) euid; |
| if (missing & SD_BUS_CREDS_SUID) |
| c->suid = (uid_t) suid; |
| if (missing & SD_BUS_CREDS_FSUID) |
| c->fsuid = (uid_t) fsuid; |
| |
| c->mask |= missing & (SD_BUS_CREDS_UID|SD_BUS_CREDS_EUID|SD_BUS_CREDS_SUID|SD_BUS_CREDS_FSUID); |
| continue; |
| } |
| } |
| |
| if (missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID)) { |
| p = startswith(line, "Gid:"); |
| if (p) { |
| unsigned long gid, egid, sgid, fsgid; |
| |
| p += strspn(p, WHITESPACE); |
| if (sscanf(p, "%lu %lu %lu %lu", &gid, &egid, &sgid, &fsgid) != 4) |
| return -EIO; |
| |
| if (missing & SD_BUS_CREDS_GID) |
| c->gid = (gid_t) gid; |
| if (missing & SD_BUS_CREDS_EGID) |
| c->egid = (gid_t) egid; |
| if (missing & SD_BUS_CREDS_SGID) |
| c->sgid = (gid_t) sgid; |
| if (missing & SD_BUS_CREDS_FSGID) |
| c->fsgid = (gid_t) fsgid; |
| |
| c->mask |= missing & (SD_BUS_CREDS_GID|SD_BUS_CREDS_EGID|SD_BUS_CREDS_SGID|SD_BUS_CREDS_FSGID); |
| continue; |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { |
| p = startswith(line, "Groups:"); |
| if (p) { |
| size_t allocated = 0; |
| |
| for (;;) { |
| unsigned long g; |
| int n = 0; |
| |
| p += strspn(p, WHITESPACE); |
| if (*p == 0) |
| break; |
| |
| if (sscanf(p, "%lu%n", &g, &n) != 1) |
| return -EIO; |
| |
| if (!GREEDY_REALLOC(c->supplementary_gids, allocated, c->n_supplementary_gids+1)) |
| return -ENOMEM; |
| |
| c->supplementary_gids[c->n_supplementary_gids++] = (gid_t) g; |
| p += n; |
| } |
| |
| c->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
| continue; |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_EFFECTIVE_CAPS) { |
| p = startswith(line, "CapEff:"); |
| if (p) { |
| r = parse_caps(c, CAP_OFFSET_EFFECTIVE, p); |
| if (r < 0) |
| return r; |
| |
| c->mask |= SD_BUS_CREDS_EFFECTIVE_CAPS; |
| continue; |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_PERMITTED_CAPS) { |
| p = startswith(line, "CapPrm:"); |
| if (p) { |
| r = parse_caps(c, CAP_OFFSET_PERMITTED, p); |
| if (r < 0) |
| return r; |
| |
| c->mask |= SD_BUS_CREDS_PERMITTED_CAPS; |
| continue; |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_INHERITABLE_CAPS) { |
| p = startswith(line, "CapInh:"); |
| if (p) { |
| r = parse_caps(c, CAP_OFFSET_INHERITABLE, p); |
| if (r < 0) |
| return r; |
| |
| c->mask |= SD_BUS_CREDS_INHERITABLE_CAPS; |
| continue; |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_BOUNDING_CAPS) { |
| p = startswith(line, "CapBnd:"); |
| if (p) { |
| r = parse_caps(c, CAP_OFFSET_BOUNDING, p); |
| if (r < 0) |
| return r; |
| |
| c->mask |= SD_BUS_CREDS_BOUNDING_CAPS; |
| continue; |
| } |
| } |
| } |
| } |
| } |
| |
| if (missing & SD_BUS_CREDS_SELINUX_CONTEXT) { |
| const char *p; |
| |
| p = procfs_file_alloca(pid, "attr/current"); |
| r = read_one_line_file(p, &c->label); |
| if (r < 0) { |
| if (r != -ENOENT && r != -EINVAL && r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; |
| } |
| |
| if (missing & SD_BUS_CREDS_COMM) { |
| r = get_process_comm(pid, &c->comm); |
| if (r < 0) { |
| if (r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_COMM; |
| } |
| |
| if (missing & SD_BUS_CREDS_EXE) { |
| r = get_process_exe(pid, &c->exe); |
| if (r == -ESRCH) { |
| /* Unfortunately we cannot really distinguish |
| * the case here where the process does not |
| * exist, and /proc/$PID/exe being unreadable |
| * because $PID is a kernel thread. Hence, |
| * assume it is a kernel thread, and rely on |
| * that this case is caught with a later |
| * call. */ |
| c->exe = NULL; |
| c->mask |= SD_BUS_CREDS_EXE; |
| } else if (r < 0) { |
| if (r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_EXE; |
| } |
| |
| if (missing & SD_BUS_CREDS_CMDLINE) { |
| const char *p; |
| |
| p = procfs_file_alloca(pid, "cmdline"); |
| r = read_full_file(p, &c->cmdline, &c->cmdline_size); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) { |
| if (r != -EPERM && r != -EACCES) |
| return r; |
| } else { |
| if (c->cmdline_size == 0) { |
| free(c->cmdline); |
| c->cmdline = NULL; |
| } |
| |
| c->mask |= SD_BUS_CREDS_CMDLINE; |
| } |
| } |
| |
| if (tid > 0 && (missing & SD_BUS_CREDS_TID_COMM)) { |
| _cleanup_free_ char *p = NULL; |
| |
| if (asprintf(&p, "/proc/"PID_FMT"/task/"PID_FMT"/comm", pid, tid) < 0) |
| return -ENOMEM; |
| |
| r = read_one_line_file(p, &c->tid_comm); |
| if (r == -ENOENT) |
| return -ESRCH; |
| if (r < 0) { |
| if (r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_TID_COMM; |
| } |
| |
| if (missing & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID)) { |
| |
| if (!c->cgroup) { |
| r = cg_pid_get_path(NULL, pid, &c->cgroup); |
| if (r < 0) { |
| if (r != -EPERM && r != -EACCES) |
| return r; |
| } |
| } |
| |
| if (!c->cgroup_root) { |
| r = cg_get_root_path(&c->cgroup_root); |
| if (r < 0) |
| return r; |
| } |
| |
| if (c->cgroup) |
| c->mask |= missing & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_OWNER_UID); |
| } |
| |
| if (missing & SD_BUS_CREDS_AUDIT_SESSION_ID) { |
| r = audit_session_from_pid(pid, &c->audit_session_id); |
| if (r == -ENXIO) { |
| /* ENXIO means: no audit session id assigned */ |
| c->audit_session_id = AUDIT_SESSION_INVALID; |
| c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID; |
| } else if (r < 0) { |
| if (r != -EOPNOTSUPP && r != -ENOENT && r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID; |
| } |
| |
| if (missing & SD_BUS_CREDS_AUDIT_LOGIN_UID) { |
| r = audit_loginuid_from_pid(pid, &c->audit_login_uid); |
| if (r == -ENXIO) { |
| /* ENXIO means: no audit login uid assigned */ |
| c->audit_login_uid = UID_INVALID; |
| c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID; |
| } else if (r < 0) { |
| if (r != -EOPNOTSUPP && r != -ENOENT && r != -EPERM && r != -EACCES) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID; |
| } |
| |
| if (missing & SD_BUS_CREDS_TTY) { |
| r = get_ctty(pid, NULL, &c->tty); |
| if (r == -ENXIO) { |
| /* ENXIO means: process has no controlling TTY */ |
| c->tty = NULL; |
| c->mask |= SD_BUS_CREDS_TTY; |
| } else if (r < 0) { |
| if (r != -EPERM && r != -EACCES && r != -ENOENT) |
| return r; |
| } else |
| c->mask |= SD_BUS_CREDS_TTY; |
| } |
| |
| /* In case only the exe path was to be read we cannot |
| * distinguish the case where the exe path was unreadable |
| * because the process was a kernel thread, or when the |
| * process didn't exist at all. Hence, let's do a final check, |
| * to be sure. */ |
| if (!pid_is_alive(pid)) |
| return -ESRCH; |
| |
| if (tid > 0 && tid != pid && !pid_is_unwaited(tid)) |
| return -ESRCH; |
| |
| c->augmented = missing & c->mask; |
| |
| return 0; |
| } |
| |
| int bus_creds_extend_by_pid(sd_bus_creds *c, uint64_t mask, sd_bus_creds **ret) { |
| _cleanup_bus_creds_unref_ sd_bus_creds *n = NULL; |
| int r; |
| |
| assert(c); |
| assert(ret); |
| |
| if ((mask & ~c->mask) == 0 || (!(mask & SD_BUS_CREDS_AUGMENT))) { |
| /* There's already all data we need, or augmentation |
| * wasn't turned on. */ |
| |
| *ret = sd_bus_creds_ref(c); |
| return 0; |
| } |
| |
| n = bus_creds_new(); |
| if (!n) |
| return -ENOMEM; |
| |
| /* Copy the original data over */ |
| |
| if (c->mask & mask & SD_BUS_CREDS_PID) { |
| n->pid = c->pid; |
| n->mask |= SD_BUS_CREDS_PID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_TID) { |
| n->tid = c->tid; |
| n->mask |= SD_BUS_CREDS_TID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_PPID) { |
| n->ppid = c->ppid; |
| n->mask |= SD_BUS_CREDS_PPID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_UID) { |
| n->uid = c->uid; |
| n->mask |= SD_BUS_CREDS_UID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_EUID) { |
| n->euid = c->euid; |
| n->mask |= SD_BUS_CREDS_EUID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_SUID) { |
| n->suid = c->suid; |
| n->mask |= SD_BUS_CREDS_SUID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_FSUID) { |
| n->fsuid = c->fsuid; |
| n->mask |= SD_BUS_CREDS_FSUID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_GID) { |
| n->gid = c->gid; |
| n->mask |= SD_BUS_CREDS_GID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_EGID) { |
| n->egid = c->egid; |
| n->mask |= SD_BUS_CREDS_EGID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_SGID) { |
| n->sgid = c->sgid; |
| n->mask |= SD_BUS_CREDS_SGID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_FSGID) { |
| n->fsgid = c->fsgid; |
| n->mask |= SD_BUS_CREDS_FSGID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_SUPPLEMENTARY_GIDS) { |
| if (c->supplementary_gids) { |
| n->supplementary_gids = newdup(gid_t, c->supplementary_gids, c->n_supplementary_gids); |
| if (!n->supplementary_gids) |
| return -ENOMEM; |
| n->n_supplementary_gids = c->n_supplementary_gids; |
| } else { |
| n->supplementary_gids = NULL; |
| n->n_supplementary_gids = 0; |
| } |
| |
| n->mask |= SD_BUS_CREDS_SUPPLEMENTARY_GIDS; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_COMM) { |
| assert(c->comm); |
| |
| n->comm = strdup(c->comm); |
| if (!n->comm) |
| return -ENOMEM; |
| |
| n->mask |= SD_BUS_CREDS_COMM; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_TID_COMM) { |
| assert(c->tid_comm); |
| |
| n->tid_comm = strdup(c->tid_comm); |
| if (!n->tid_comm) |
| return -ENOMEM; |
| |
| n->mask |= SD_BUS_CREDS_TID_COMM; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_EXE) { |
| if (c->exe) { |
| n->exe = strdup(c->exe); |
| if (!n->exe) |
| return -ENOMEM; |
| } else |
| n->exe = NULL; |
| |
| n->mask |= SD_BUS_CREDS_EXE; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_CMDLINE) { |
| if (c->cmdline) { |
| n->cmdline = memdup(c->cmdline, c->cmdline_size); |
| if (!n->cmdline) |
| return -ENOMEM; |
| |
| n->cmdline_size = c->cmdline_size; |
| } else { |
| n->cmdline = NULL; |
| n->cmdline_size = 0; |
| } |
| |
| n->mask |= SD_BUS_CREDS_CMDLINE; |
| } |
| |
| if (c->mask & mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_OWNER_UID)) { |
| assert(c->cgroup); |
| |
| n->cgroup = strdup(c->cgroup); |
| if (!n->cgroup) |
| return -ENOMEM; |
| |
| n->cgroup_root = strdup(c->cgroup_root); |
| if (!n->cgroup_root) |
| return -ENOMEM; |
| |
| n->mask |= mask & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_SESSION|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_SLICE|SD_BUS_CREDS_USER_SLICE|SD_BUS_CREDS_OWNER_UID); |
| } |
| |
| if (c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS)) { |
| assert(c->capability); |
| |
| n->capability = memdup(c->capability, DIV_ROUND_UP(cap_last_cap(), 32U) * 4 * 4); |
| if (!n->capability) |
| return -ENOMEM; |
| |
| n->mask |= c->mask & mask & (SD_BUS_CREDS_EFFECTIVE_CAPS|SD_BUS_CREDS_PERMITTED_CAPS|SD_BUS_CREDS_INHERITABLE_CAPS|SD_BUS_CREDS_BOUNDING_CAPS); |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_SELINUX_CONTEXT) { |
| assert(c->label); |
| |
| n->label = strdup(c->label); |
| if (!n->label) |
| return -ENOMEM; |
| n->mask |= SD_BUS_CREDS_SELINUX_CONTEXT; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_AUDIT_SESSION_ID) { |
| n->audit_session_id = c->audit_session_id; |
| n->mask |= SD_BUS_CREDS_AUDIT_SESSION_ID; |
| } |
| if (c->mask & mask & SD_BUS_CREDS_AUDIT_LOGIN_UID) { |
| n->audit_login_uid = c->audit_login_uid; |
| n->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_TTY) { |
| if (c->tty) { |
| n->tty = strdup(c->tty); |
| if (!n->tty) |
| return -ENOMEM; |
| } else |
| n->tty = NULL; |
| n->mask |= SD_BUS_CREDS_TTY; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_UNIQUE_NAME) { |
| assert(c->unique_name); |
| |
| n->unique_name = strdup(c->unique_name); |
| if (!n->unique_name) |
| return -ENOMEM; |
| n->mask |= SD_BUS_CREDS_UNIQUE_NAME; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) { |
| if (strv_isempty(c->well_known_names)) |
| n->well_known_names = NULL; |
| else { |
| n->well_known_names = strv_copy(c->well_known_names); |
| if (!n->well_known_names) |
| return -ENOMEM; |
| } |
| n->well_known_names_driver = c->well_known_names_driver; |
| n->well_known_names_local = c->well_known_names_local; |
| n->mask |= SD_BUS_CREDS_WELL_KNOWN_NAMES; |
| } |
| |
| if (c->mask & mask & SD_BUS_CREDS_DESCRIPTION) { |
| assert(c->description); |
| n->description = strdup(c->description); |
| if (!n->description) |
| return -ENOMEM; |
| n->mask |= SD_BUS_CREDS_DESCRIPTION; |
| } |
| |
| n->augmented = c->augmented & n->mask; |
| |
| /* Get more data */ |
| |
| r = bus_creds_add_more(n, mask, 0, 0); |
| if (r < 0) |
| return r; |
| |
| *ret = n; |
| n = NULL; |
| return 0; |
| } |