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sysdeps/managarm: Implement SCM_CREDENTIALS #1066

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May 27, 2024
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sysdeps/managarm: Implement SCM_CREDENTIALS #1066

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33 changes: 22 additions & 11 deletions sysdeps/managarm/generic/file.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -867,22 +867,33 @@ int sys_msg_send(int sockfd, const struct msghdr *hdr, int flags, ssize_t *lengt
req.set_flags(flags);
req.set_size(overall_size);

req.set_has_cmsg_creds(false);
req.set_has_cmsg_rights(false);
for(auto cmsg = CMSG_FIRSTHDR(hdr); cmsg; cmsg = CMSG_NXTHDR(hdr, cmsg)) {
__ensure(cmsg->cmsg_level == SOL_SOCKET);
__ensure(cmsg->cmsg_len >= sizeof(struct cmsghdr));
if(cmsg->cmsg_type == SCM_CREDENTIALS) {
mlibc::infoLogger() << "mlibc: SCM_CREDENTIALS requested but we don't handle that yet!" << frg::endlog;
req.set_has_cmsg_creds(true);
size_t size = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
__ensure(size == sizeof(struct ucred));
struct ucred creds;
memcpy(&creds, CMSG_DATA(cmsg), sizeof(struct ucred));
req.set_creds_pid(creds.pid);
req.set_creds_uid(creds.uid);
req.set_creds_gid(creds.gid);
} else if(cmsg->cmsg_type == SCM_RIGHTS) {
req.set_has_cmsg_rights(true);
size_t size = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
__ensure(!(size % sizeof(int)));
for(size_t off = 0; off < size; off += sizeof(int)) {
int fd;
memcpy(&fd, CMSG_DATA(cmsg) + off, sizeof(int));
req.add_fds(fd);
}
} else {
mlibc::infoLogger() << "mlibc: sys_msg_send only supports SCM_RIGHTS or SCM_CREDENTIALS, got: " << cmsg->cmsg_type << "!" << frg::endlog;
return EINVAL;
}
__ensure(cmsg->cmsg_type == SCM_RIGHTS);
__ensure(cmsg->cmsg_len >= sizeof(struct cmsghdr));

size_t size = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
__ensure(!(size % sizeof(int)));
for(size_t off = 0; off < size; off += sizeof(int)) {
int fd;
memcpy(&fd, CMSG_DATA(cmsg) + off, sizeof(int));
req.add_fds(fd);
}
}

auto [offer, send_head, send_tail, send_data, imbue_creds, send_addr, recv_resp] = exchangeMsgsSync(
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