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log: pass SCM_CREDENTIALS when logging to syslog

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This commit is contained in:
Lennart Poettering 2010-08-21 01:51:16 +02:00
parent 5845b46ba3
commit 6309077509
4 changed files with 71 additions and 14 deletions
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15
fixme
View File

@ -58,6 +58,20 @@
* bash completion a la gdbus
* use sulogin
* [Install] section rausmachen für early boot krams, uznd per default nach /lib linken
* s/Exited/Process/ in systemctl status
* systemctl status: "active since 5min"
* systemctl list-jobs deps anzeigen
* /etc/systemd/system.conf: mounten per default option
* ConditionFileExists=, ConditionKernelCommandLine=, ConditionEnvironment= mit !
External:
* place /etc/inittab with explaining blurb.
@ -103,6 +117,7 @@ https://bugzilla.redhat.com/show_bug.cgi?id=617327 -- gpm
https://bugzilla.redhat.com/show_bug.cgi?id=617330 -- pcsc-lite
https://bugzilla.redhat.com/show_bug.cgi?id=617321 -- audit
https://bugzilla.redhat.com/show_bug.cgi?id=617316 -- abrt
http://sources.redhat.com/bugzilla/show_bug.cgi?id=11930 -- glibc
Regularly:

17
src/log.c
View File

@ -249,6 +249,11 @@ static int write_to_syslog(
char header_priority[16], header_time[64], header_pid[16];
struct iovec iovec[5];
struct msghdr msghdr;
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
} control;
struct ucred *ucred;
time_t t;
struct tm *tm;
@ -275,9 +280,21 @@ static int write_to_syslog(
IOVEC_SET_STRING(iovec[3], header_pid);
IOVEC_SET_STRING(iovec[4], buffer);
zero(control);
control.cmsghdr.cmsg_level = SOL_SOCKET;
control.cmsghdr.cmsg_type = SCM_CREDENTIALS;
control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
ucred->pid = getpid();
ucred->uid = getuid();
ucred->gid = getgid();
zero(msghdr);
msghdr.msg_iov = iovec;
msghdr.msg_iovlen = ELEMENTSOF(iovec);
msghdr.msg_control = &control;
msghdr.msg_controllen = control.cmsghdr.cmsg_len;
if (sendmsg(syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)
return -errno;

51
src/logger.c
View File

@ -81,6 +81,7 @@ struct Stream {
char *process;
pid_t pid;
uid_t uid;
gid_t gid;
bool prefix;
@ -151,6 +152,21 @@ static int stream_log(Stream *s, char *p, usec_t ts) {
if (s->target == STREAM_SYSLOG) {
struct msghdr msghdr;
union {
struct cmsghdr cmsghdr;
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
} control;
struct ucred *ucred;
zero(control);
control.cmsghdr.cmsg_level = SOL_SOCKET;
control.cmsghdr.cmsg_type = SCM_CREDENTIALS;
control.cmsghdr.cmsg_len = CMSG_LEN(sizeof(struct ucred));
ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
ucred->pid = s->pid;
ucred->uid = s->uid;
ucred->gid = s->gid;
IOVEC_SET_STRING(iovec[1], header_time);
IOVEC_SET_STRING(iovec[2], s->process);
@ -160,6 +176,8 @@ static int stream_log(Stream *s, char *p, usec_t ts) {
zero(msghdr);
msghdr.msg_iov = iovec;
msghdr.msg_iovlen = ELEMENTSOF(iovec);
msghdr.msg_control = &control;
msghdr.msg_controllen = control.cmsghdr.cmsg_len;
if (sendmsg(s->server->syslog_fd, &msghdr, MSG_NOSIGNAL) < 0)
return -errno;
@ -208,12 +226,12 @@ static int stream_line(Stream *s, char *p, usec_t ts) {
case STREAM_PRIORITY:
if ((r = safe_atoi(p, &s->priority)) < 0) {
log_warning("Failed to parse log priority line: %s", strerror(errno));
log_warning("Failed to parse log priority line: %m");
return r;
}
if (s->priority < 0) {
log_warning("Log priority negative: %s", strerror(errno));
log_warning("Log priority negative: %m");
return -ERANGE;
}
@ -284,7 +302,7 @@ static int stream_process(Stream *s, usec_t ts) {
if (errno == EAGAIN)
return 0;
log_warning("Failed to read from stream: %s", strerror(errno));
log_warning("Failed to read from stream: %m");
return -1;
}
@ -373,6 +391,7 @@ static int stream_new(Server *s, int server_fd) {
stream->pid = ucred.pid;
stream->uid = ucred.uid;
stream->gid = ucred.gid;
stream->server = s;
LIST_PREPEND(Stream, stream, s->streams, stream);
@ -424,7 +443,7 @@ static int server_init(Server *s, unsigned n_sockets) {
if ((s->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0) {
r = -errno;
log_error("Failed to create epoll object: %s", strerror(errno));
log_error("Failed to create epoll object: %m");
goto fail;
}
@ -445,19 +464,25 @@ static int server_init(Server *s, unsigned n_sockets) {
goto fail;
}
/* We use ev.data.ptr instead of ev.data.fd here,
* since on 64bit archs fd is 32bit while a pointer is
* 64bit. To make sure we can easily distuingish fd
* values and pointer values we want to make sure to
* write the full field unconditionally. */
zero(ev);
ev.events = EPOLLIN;
ev.data.ptr = UINT_TO_PTR(fd);
ev.data.ptr = INT_TO_PTR(fd);
if (epoll_ctl(s->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0) {
r = -errno;
log_error("Failed to add server fd to epoll object: %s", strerror(errno));
log_error("Failed to add server fd to epoll object: %m");
goto fail;
}
}
if ((s->syslog_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
r = -errno;
log_error("Failed to create log fd: %s", strerror(errno));
log_error("Failed to create log fd: %m");
goto fail;
}
@ -467,13 +492,13 @@ static int server_init(Server *s, unsigned n_sockets) {
if (connect(s->syslog_fd, &sa.sa, sizeof(sa)) < 0) {
r = -errno;
log_error("Failed to connect log socket to /dev/log: %s", strerror(errno));
log_error("Failed to connect log socket to /dev/log: %m");
goto fail;
}
/* /dev/kmsg logging is strictly optional */
if ((s->kmsg_fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0)
log_warning("Failed to open /dev/kmsg for logging, disabling kernel log buffer support: %s", strerror(errno));
log_warning("Failed to open /dev/kmsg for logging, disabling kernel log buffer support: %m");
return 0;
@ -493,15 +518,15 @@ static int process_event(Server *s, struct epoll_event *ev) {
* first 4k usually are part of a seperate null pointer
* dereference page. */
if (PTR_TO_UINT(ev->data.ptr) >= SD_LISTEN_FDS_START &&
PTR_TO_UINT(ev->data.ptr) < SD_LISTEN_FDS_START+s->n_server_fd) {
if (PTR_TO_INT(ev->data.ptr) >= SD_LISTEN_FDS_START &&
PTR_TO_INT(ev->data.ptr) < SD_LISTEN_FDS_START+(int)s->n_server_fd) {
if (ev->events != EPOLLIN) {
log_info("Got invalid event from epoll. (1)");
return -EIO;
}
if ((r = stream_new(s, PTR_TO_UINT(ev->data.ptr))) < 0) {
if ((r = stream_new(s, PTR_TO_INT(ev->data.ptr))) < 0) {
log_info("Failed to accept new connection: %s", strerror(-r));
return r;
}
@ -579,7 +604,7 @@ int main(int argc, char *argv[]) {
if (errno == EINTR)
continue;
log_error("epoll_wait() failed: %s", strerror(errno));
log_error("epoll_wait() failed: %m");
goto fail;
}

2
src/manager.c
View File

@ -1931,7 +1931,7 @@ static int manager_process_signal_fd(Manager *m) {
if (n >= 0)
return -EIO;
if (errno == EAGAIN)
if (errno == EINTR || errno == EAGAIN)
break;
return -errno;