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Diffstat (limited to 'kms/client')
-rw-r--r--kms/client/kms_client.c245
-rw-r--r--kms/client/kms_client.h21
2 files changed, 266 insertions, 0 deletions
diff --git a/kms/client/kms_client.c b/kms/client/kms_client.c
new file mode 100644
index 0000000..2b59836
--- /dev/null
+++ b/kms/client/kms_client.c
@@ -0,0 +1,245 @@
+#include "kms_client.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <unistd.h>
+#include <signal.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/wait.h>
+#include <sys/capability.h>
+
+static bool is_inside_flatpak(void) {
+ return getenv("FLATPAK_ID") != NULL;
+}
+
+static int send_msg_to_server(int server_fd, gsr_kms_request *request) {
+ struct iovec iov;
+ iov.iov_base = request;
+ iov.iov_len = sizeof(*request);
+
+ struct msghdr request_message = {0};
+ request_message.msg_iov = &iov;
+ request_message.msg_iovlen = 1;
+
+ return sendmsg(server_fd, &request_message, 0);
+}
+
+static int recv_msg_from_server(int server_fd, gsr_kms_response *response) {
+ struct iovec iov;
+ iov.iov_base = response;
+ iov.iov_len = sizeof(*response);
+
+ struct msghdr response_message = {0};
+ response_message.msg_iov = &iov;
+ response_message.msg_iovlen = 1;
+
+ char cmsgbuf[CMSG_SPACE(sizeof(int))];
+ memset(cmsgbuf, 0, sizeof(cmsgbuf));
+ response_message.msg_control = cmsgbuf;
+ response_message.msg_controllen = sizeof(cmsgbuf);
+
+ int res = recvmsg(server_fd, &response_message, MSG_WAITALL);
+ if(res <= 0)
+ return res;
+
+ if(response->result == KMS_RESULT_OK)
+ response->data.fd.fd = 0;
+
+ struct cmsghdr *cmsg = CMSG_FIRSTHDR(&response_message);
+ if(cmsg) {
+ fprintf(stderr, "got cmsg, %d\n", cmsg->cmsg_type);
+ if(cmsg->cmsg_type == SCM_RIGHTS) {
+ int kms_fd = 0;
+ memcpy(&kms_fd, CMSG_DATA(cmsg), sizeof(int));
+ fprintf(stderr, "kms fd: %d\n", kms_fd);
+ response->data.fd.fd = kms_fd;
+ }
+ }
+
+ return res;
+}
+
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path, const char *program_dir) {
+ self->kms_server_pid = -1;
+ self->card_path = NULL;
+ self->socket_fd = -1;
+ self->client_fd = -1;
+ self->socket_path[0] = '\0';
+ struct sockaddr_un local_addr = {0};
+ struct sockaddr_un remote_addr = {0};
+
+ bool inside_flatpak = is_inside_flatpak();
+ char server_filepath[PATH_MAX];
+ snprintf(server_filepath, sizeof(server_filepath), "%s/%s", program_dir, "gsr-kms-server");
+ if(access(server_filepath, F_OK) != 0 || inside_flatpak)
+ snprintf(server_filepath, sizeof(server_filepath), "gsr-kms-server"); // Assume gsr-kms-server is in $PATH
+
+ bool has_perm = 0;
+ if(geteuid() == 0) {
+ has_perm = true;
+ } else {
+ cap_t kms_server_cap = cap_get_file(server_filepath);
+ if(kms_server_cap) {
+ cap_flag_value_t res = 0;
+ cap_get_flag(kms_server_cap, CAP_SYS_ADMIN, CAP_PERMITTED, &res);
+ if(res == CAP_SET) {
+ //fprintf(stderr, "has permission!\n");
+ has_perm = true;
+ } else {
+ //fprintf(stderr, "No permission:(\n");
+ }
+ cap_free(kms_server_cap);
+ } else {
+ if(errno == ENODATA)
+ fprintf(stderr, "gsr info: gsr_kms_client_init: gsr-kms-server is missing sys_admin cap and will require root authentication. To bypass this automatically, run: sudo setcap cap_sys_admin+ep '%s'\n", server_filepath);
+ else
+ fprintf(stderr, "gsr info: gsr_kms_client_init: failed to get cap\n");
+ }
+ }
+
+ fprintf(stderr, "gsr info: gsr server path: %s, exists: %s\n", server_filepath, access(server_filepath, F_OK) == 0 ? "yes" : "no");
+
+ self->card_path = strdup(card_path);
+ if(!self->card_path) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to duplicate card_path\n");
+ goto err;
+ }
+
+ strcpy(self->socket_path, "/tmp/gsr-kms-socket-XXXXXX");
+ if(!tmpnam(self->socket_path)) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: mkstemp failed, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ self->socket_fd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if(self->socket_fd == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: socket failed, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ local_addr.sun_family = AF_UNIX;
+ strncpy(local_addr.sun_path, self->socket_path, sizeof(local_addr.sun_path));
+ if(bind(self->socket_fd, (struct sockaddr*)&local_addr, sizeof(local_addr.sun_family) + strlen(local_addr.sun_path)) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to bind socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ if(listen(self->socket_fd, 1) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: failed to listen on socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+
+ pid_t pid = fork();
+ if(pid == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: fork failed, error: %s\n", strerror(errno));
+ goto err;
+ } else if(pid == 0) { /* child */
+ if(has_perm) {
+ const char *args[] = { server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ } else if(inside_flatpak) {
+ const char *args[] = { "flatpak-spawn", "--host", "pkexec", server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ } else {
+ const char *args[] = { "pkexec", server_filepath, self->socket_path, NULL };
+ execvp(args[0], (char *const*)args);
+ }
+ perror("execvp");
+ _exit(127);
+ } else { /* parent */
+ self->kms_server_pid = pid;
+ }
+
+ fprintf(stderr, "gsr info: gsr_kms_client_init: waiting for client to connect\n");
+ for(;;) {
+ struct timeval tv;
+ fd_set rfds;
+ FD_ZERO(&rfds);
+ FD_SET(self->socket_fd, &rfds);
+
+ tv.tv_sec = 0;
+ tv.tv_usec = 100 * 1000; // 100 ms
+
+ int select_res = select(1 + self->socket_fd, &rfds, NULL, NULL, &tv);
+ if(select_res > 0) {
+ socklen_t sock_len = 0;
+ self->client_fd = accept(self->socket_fd, (struct sockaddr*)&remote_addr, &sock_len);
+ if(self->client_fd == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: accept failed on socket, error: %s\n", strerror(errno));
+ goto err;
+ }
+ break;
+ } else {
+ int status;
+ int wait_result = waitpid(self->kms_server_pid, &status, WNOHANG);
+ if(wait_result != 0) {
+ fprintf(stderr, "gsr error: gsr_kms_client_init: kms server died or never started, error: %s\n", strerror(errno));
+ goto err;
+ }
+ }
+ }
+ fprintf(stderr, "gsr info: gsr_kms_client_init: client connected\n");
+
+ return 0;
+
+ err:
+ gsr_kms_client_deinit(self);
+ return -1;
+}
+
+void gsr_kms_client_deinit(gsr_kms_client *self) {
+ if(self->card_path) {
+ free(self->card_path);
+ self->card_path = NULL;
+ }
+
+ if(self->client_fd != -1) {
+ close(self->client_fd);
+ self->client_fd = -1;
+ }
+
+ if(self->socket_fd != -1) {
+ close(self->socket_fd);
+ self->socket_fd = -1;
+ }
+
+ if(self->kms_server_pid != -1) {
+ kill(self->kms_server_pid, SIGINT);
+ int status;
+ waitpid(self->kms_server_pid, &status, 0);
+ self->kms_server_pid = -1;
+ }
+
+ if(self->socket_path[0] != '\0') {
+ remove(self->socket_path);
+ self->socket_path[0] = '\0';
+ }
+}
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response) {
+ response->result = KMS_RESULT_FAILED_TO_SEND;
+ strcpy(response->data.err_msg, "failed to send");
+
+ gsr_kms_request request;
+ request.type = KMS_REQUEST_TYPE_GET_KMS;
+ strcpy(request.data.card_path, self->card_path);
+ if(send_msg_to_server(self->client_fd, &request) == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to send request message to server\n");
+ return -1;
+ }
+
+ const int recv_res = recv_msg_from_server(self->client_fd, response);
+ if(recv_res == 0) {
+ fprintf(stderr, "gsr warning: gsr_kms_client_get_kms: kms server shut down\n");
+ return -1;
+ } else if(recv_res == -1) {
+ fprintf(stderr, "gsr error: gsr_kms_client_get_kms: failed to receive response\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/kms/client/kms_client.h b/kms/client/kms_client.h
new file mode 100644
index 0000000..59d3cb3
--- /dev/null
+++ b/kms/client/kms_client.h
@@ -0,0 +1,21 @@
+#ifndef GSR_KMS_CLIENT_H
+#define GSR_KMS_CLIENT_H
+
+#include "../kms_shared.h"
+#include <sys/types.h>
+
+typedef struct {
+ pid_t kms_server_pid;
+ int socket_fd;
+ int client_fd;
+ char socket_path[27];
+ char *card_path;
+} gsr_kms_client;
+
+/* |card_path| should be a path to card, for example /dev/dri/card0 */
+int gsr_kms_client_init(gsr_kms_client *self, const char *card_path, const char *program_dir);
+void gsr_kms_client_deinit(gsr_kms_client *self);
+
+int gsr_kms_client_get_kms(gsr_kms_client *self, gsr_kms_response *response);
+
+#endif /* #define GSR_KMS_CLIENT_H */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-21 22:58:27 +0000