libsystemd-bus: rename to libsystemd

Documentation was updated to refer to either 'libsystemd' or 'sd-bus' in place
of libsystemd-bus.

1 files changed, 904 insertions, 0 deletions

diff --git a/src/libsystemd/bus-creds.c b/src/libsystemd/bus-creds.c
new file mode 100644
index 0000000000..52e55fc5e1
--- /dev/null
+++ b/src/libsystemd/bus-creds.c
@@ -0,0 +1,904 @@
+/*-*- 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 "util.h"
+#include "cgroup-util.h"
+#include "fileio.h"
+#include "audit.h"
+#include "bus-message.h"
+#include "bus-util.h"
+#include "time-util.h"
+#include "strv.h"
+#include "bus-creds.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);
+
+        strv_free(c->cmdline_array);
+        strv_free(c->well_known_names);
+}
+
+_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) {
+                        bus_creds_done(c);
+
+                        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);
+                }
+        } 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;
+}
+
+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(pid_t pid, uint64_t mask, sd_bus_creds **ret) {
+        sd_bus_creds *c;
+        int r;
+
+        assert_return(pid >= 0, -EINVAL);
+        assert_return(mask <= _SD_BUS_CREDS_ALL, -ENOTSUP);
+        assert_return(ret, -EINVAL);
+
+        if (pid == 0)
+                pid = getpid();
+
+        c = bus_creds_new();
+        if (!c)
+                return -ENOMEM;
+
+        r = bus_creds_add_more(c, mask, 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 (kill(pid, 0) < 0 && errno == ESRCH) {
+                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_gid(sd_bus_creds *c, gid_t *gid) {
+        assert_return(c, -EINVAL);
+        assert_return(gid, -EINVAL);
+
+        if (!(c->mask & SD_BUS_CREDS_UID))
+                return -ENODATA;
+
+        *gid = c->gid;
+        return 0;
+}
+
+_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_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_pid_starttime(sd_bus_creds *c, uint64_t *usec) {
+        assert_return(c, -EINVAL);
+        assert_return(usec, -EINVAL);
+
+        if (!(c->mask & SD_BUS_CREDS_PID_STARTTIME))
+                return -ENODATA;
+
+        assert(c->pid_starttime > 0);
+        *usec = c->pid_starttime;
+        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;
+
+        assert(c->exe);
+        *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_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;
+
+        assert_return(c->cmdline, -ESRCH);
+        assert(c->cmdline);
+
+        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;
+
+        *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;
+
+        *uid = c->audit_login_uid;
+        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;
+
+        *well_known_names = c->well_known_names;
+        return 0;
+}
+
+static int has_cap(sd_bus_creds *c, unsigned offset, int capability) {
+        size_t sz;
+
+        assert(c);
+        assert(c->capability);
+
+        sz = c->capability_size / 4;
+        if ((size_t) capability >= sz*8)
+                return 0;
+
+        return !!(c->capability[offset * sz + (capability / 8)] & (1 << (capability % 8)));
+}
+
+_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;
+        unsigned i;
+
+        assert(c);
+        assert(p);
+
+        p += strspn(p, WHITESPACE);
+
+        sz = strlen(p);
+        if (sz % 2 != 0)
+                return -EINVAL;
+
+        sz /= 2;
+        if (!c->capability) {
+                c->capability = new0(uint8_t, sz * 4);
+                if (!c->capability)
+                        return -ENOMEM;
+
+                c->capability_size = sz * 4;
+        }
+
+        for (i = 0; i < sz; i ++) {
+                int x, y;
+
+                x = unhexchar(p[i*2]);
+                y = unhexchar(p[i*2+1]);
+
+                if (x < 0 || y < 0)
+                        return -EINVAL;
+
+                c->capability[offset * sz + (sz - i - 1)] = (uint8_t) x << 4 | (uint8_t) y;
+        }
+
+        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);
+
+        missing = mask & ~c->mask;
+        if (missing == 0)
+                return 0;
+
+        /* Try to retrieve PID from creds if it wasn't passed to us */
+        if (pid <= 0 && (c->mask & SD_BUS_CREDS_PID))
+                pid = c->pid;
+
+        if (tid <= 0 && (c->mask & SD_BUS_CREDS_TID))
+                tid = c->pid;
+
+        /* Without pid we cannot do much... */
+        if (pid <= 0)
+                return 0;
+
+        if (missing & (SD_BUS_CREDS_UID | SD_BUS_CREDS_GID |
+                       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;
+                char line[LINE_MAX];
+                const char *p;
+
+                p = procfs_file_alloca(pid, "status");
+
+                f = fopen(p, "re");
+                if (!f)
+                        return errno == ENOENT ? -ESRCH : -errno;
+
+                FOREACH_LINE(line, f, return -errno) {
+                        truncate_nl(line);
+
+                        if (missing & SD_BUS_CREDS_UID) {
+                                p = startswith(line, "Uid:");
+                                if (p) {
+                                        unsigned long uid;
+
+                                        p += strspn(p, WHITESPACE);
+                                        if (sscanf(p, "%lu", &uid) != 1)
+                                                return -EIO;
+
+                                        c->uid = (uid_t) uid;
+                                        c->mask |= SD_BUS_CREDS_UID;
+                                        continue;
+                                }
+                        }
+
+                        if (missing & SD_BUS_CREDS_GID) {
+                                p = startswith(line, "Gid:");
+                                if (p) {
+                                        unsigned long gid;
+
+                                        p += strspn(p, WHITESPACE);
+                                        if (sscanf(p, "%lu", &gid) != 1)
+                                                return -EIO;
+
+                                        c->gid = (uid_t) gid;
+                                        c->mask |= SD_BUS_CREDS_GID;
+                                        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_PID_STARTTIME)) {
+                unsigned long long st;
+
+                r = get_starttime_of_pid(pid, &st);
+                if (r < 0)
+                        return r;
+
+                c->pid_starttime = ((usec_t) st * USEC_PER_SEC) / (usec_t) sysconf(_SC_CLK_TCK);
+                c->mask |= SD_BUS_CREDS_PID_STARTTIME;
+        }
+
+        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 && r != -ENOENT && r != -EINVAL)
+                        return r;
+                else if (r >= 0)
+                        c->mask |= SD_BUS_CREDS_SELINUX_CONTEXT;
+        }
+
+        if (missing & SD_BUS_CREDS_COMM) {
+                r = get_process_comm(pid, &c->comm);
+                if (r < 0)
+                        return r;
+
+                c->mask |= SD_BUS_CREDS_COMM;
+        }
+
+        if (missing & SD_BUS_CREDS_EXE) {
+                r = get_process_exe(pid, &c->exe);
+                if (r < 0)
+                        return r;
+
+                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 < 0)
+                        return r;
+
+                if (c->cmdline_size == 0) {
+                        free(c->cmdline);
+                        c->cmdline = NULL;
+                } else
+                        c->mask |= SD_BUS_CREDS_CMDLINE;
+        }
+
+        if (tid > 0 && (missing & SD_BUS_CREDS_TID_COMM)) {
+                _cleanup_free_ char *p = NULL;
+
+                if (asprintf(&p, "/proc/%lu/task/%lu/comm", (unsigned long) pid, (unsigned long) tid) < 0)
+                        return -ENOMEM;
+
+                r = read_one_line_file(p, &c->tid_comm);
+                if (r < 0)
+                        return r == -ENOENT ? -ESRCH : r;
+
+                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_SESSION|SD_BUS_CREDS_OWNER_UID)) {
+
+                r = cg_pid_get_path(NULL, pid, &c->cgroup);
+                if (r < 0)
+                        return r;
+
+                r = cg_get_root_path(&c->cgroup_root);
+                if (r < 0)
+                        return r;
+
+                c->mask |= missing & (SD_BUS_CREDS_CGROUP|SD_BUS_CREDS_UNIT|SD_BUS_CREDS_USER_UNIT|SD_BUS_CREDS_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 < 0 && r != -ENOTSUP && r != -ENXIO && r != -ENOENT)
+                        return r;
+                else if (r >= 0)
+                        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 < 0 && r != -ENOTSUP && r != -ENXIO && r != -ENOENT)
+                        return r;
+                else if (r >= 0)
+                        c->mask |= SD_BUS_CREDS_AUDIT_LOGIN_UID;
+        }
+
+        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) {
+                /* There's already all data we need. */
+
+                *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_UID) {
+                n->uid = c->uid;
+                n->mask |= SD_BUS_CREDS_UID;
+        }
+
+        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_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_PID_STARTTIME) {
+                n->pid_starttime = c->pid_starttime;
+                n->mask |= SD_BUS_CREDS_PID_STARTTIME;
+        }
+
+        if (c->mask & mask & SD_BUS_CREDS_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) {
+                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) {
+                n->exe = strdup(c->exe);
+                if (!n->exe)
+                        return -ENOMEM;
+
+                n->mask |= SD_BUS_CREDS_EXE;
+        }
+
+        if (c->mask & mask & SD_BUS_CREDS_CMDLINE) {
+                n->cmdline = memdup(c->cmdline, c->cmdline_size);
+                if (!n->cmdline)
+                        return -ENOMEM;
+
+                n->cmdline_size = c->cmdline_size;
+                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_OWNER_UID)) {
+                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_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)) {
+                n->capability = memdup(c->capability, c->capability_size);
+                if (!n->capability)
+                        return -ENOMEM;
+
+                n->capability_size = c->capability_size;
+                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_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_UNIQUE_NAME) {
+                n->unique_name = strdup(c->unique_name);
+                if (!n->unique_name)
+                        return -ENOMEM;
+        }
+
+        if (c->mask & mask & SD_BUS_CREDS_WELL_KNOWN_NAMES) {
+                n->well_known_names = strv_copy(c->well_known_names);
+                if (!n->well_known_names)
+                        return -ENOMEM;
+        }
+
+        /* Get more data */
+
+        r = bus_creds_add_more(n, mask,
+                               c->mask & SD_BUS_CREDS_PID ? c->pid : 0,
+                               c->mask & SD_BUS_CREDS_TID ? c->tid : 0);
+        if (r < 0)
+                return r;
+
+        *ret = n;
+        n = NULL;
+        return 0;
+}