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-rw-r--r--src/Makefile.am16
-rw-r--r--src/providers/proxy/proxy.c (renamed from src/providers/proxy.c)1124
-rw-r--r--src/providers/proxy/proxy.h30
-rw-r--r--src/providers/proxy/proxy_child.c507
4 files changed, 1539 insertions, 138 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index d093089f..a8e90f3c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -62,7 +62,8 @@ sssdlibexec_PROGRAMS = \
krb5_child \
ldap_child \
$(sssd_pk) \
- $(sssd_info)
+ $(sssd_info) \
+ proxy_child
dist_sssdlibexec_SCRIPTS = \
config/upgrade_config.py
@@ -355,6 +356,7 @@ dist_noinst_HEADERS = \
providers/ipa/ipa_timerules.h \
providers/ipa/ipa_auth.h \
providers/ipa/ipa_dyndns.h \
+ providers/proxy/proxy.h \
tools/tools_util.h \
tools/sss_sync_ops.h \
resolv/async_resolv.h \
@@ -749,7 +751,7 @@ libsss_ldap_la_LDFLAGS = \
-module
libsss_proxy_la_SOURCES = \
- providers/proxy.c
+ providers/proxy/proxy.c
libsss_proxy_la_CFLAGS = \
$(AM_CFLAGS)
libsss_proxy_la_LIBADD = \
@@ -866,6 +868,16 @@ ldap_child_LDADD = \
$(OPENLDAP_LIBS) \
$(KRB5_LIBS)
+proxy_child_SOURCES = \
+ $(SSSD_UTIL_OBJ) \
+ providers/proxy/proxy_child.c
+proxy_child_CFLAGS = \
+ $(AM_CFLAGS) \
+ $(POPT_CFLAGS)
+proxy_child_LDADD = \
+ $(PAM_LIBS) \
+ $(SSSD_LIBS)
+
memberof_la_SOURCES = \
ldb_modules/memberof.c
memberof_la_CFLAGS = \
diff --git a/src/providers/proxy.c b/src/providers/proxy/proxy.c
index ac5cf7fe..9a8dc4a2 100644
--- a/src/providers/proxy.c
+++ b/src/providers/proxy/proxy.c
@@ -24,6 +24,8 @@
#include <pwd.h>
#include <grp.h>
#include <dlfcn.h>
+#include <sys/types.h>
+#include <sys/wait.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>
@@ -31,6 +33,8 @@
#include "util/util.h"
#include "providers/dp_backend.h"
#include "db/sysdb.h"
+#include "proxy.h"
+#include <dhash.h>
struct proxy_nss_ops {
enum nss_status (*getpwnam_r)(const char *name, struct passwd *result,
@@ -65,6 +69,29 @@ struct proxy_ctx {
struct proxy_auth_ctx {
struct be_ctx *be;
char *pam_target;
+
+ uint32_t max_children;
+ uint32_t running;
+ uint32_t next_id;
+ hash_table_t *request_table;
+ struct sbus_connection *sbus_srv;
+ int timeout_ms;
+};
+
+static int client_registration(DBusMessage *message,
+ struct sbus_connection *conn);
+
+static struct sbus_method proxy_methods[] = {
+ { DP_METHOD_REGISTER, client_registration },
+ { NULL, NULL }
+};
+
+struct sbus_interface proxy_interface = {
+ DP_INTERFACE,
+ DP_PATH,
+ SBUS_DEFAULT_VTABLE,
+ proxy_methods,
+ NULL
};
struct authtok_conv {
@@ -72,61 +99,23 @@ struct authtok_conv {
uint8_t *authtok;
};
-static int proxy_internal_conv(int num_msg, const struct pam_message **msgm,
- struct pam_response **response,
- void *appdata_ptr) {
- int i;
- struct pam_response *reply;
- struct authtok_conv *auth_data;
-
- auth_data = talloc_get_type(appdata_ptr, struct authtok_conv);
-
- if (num_msg <= 0) return PAM_CONV_ERR;
-
- reply = (struct pam_response *) calloc(num_msg,
- sizeof(struct pam_response));
- if (reply == NULL) return PAM_CONV_ERR;
-
- for (i=0; i < num_msg; i++) {
- switch( msgm[i]->msg_style ) {
- case PAM_PROMPT_ECHO_OFF:
- DEBUG(4, ("Conversation message: [%s]\n", msgm[i]->msg));
- reply[i].resp_retcode = 0;
- reply[i].resp = calloc(auth_data->authtok_size + 1,
- sizeof(char));
- if (reply[i].resp == NULL) goto failed;
- memcpy(reply[i].resp, auth_data->authtok, auth_data->authtok_size);
-
- break;
- default:
- DEBUG(1, ("Conversation style %d not supported.\n",
- msgm[i]->msg_style));
- goto failed;
- }
- }
-
- *response = reply;
- reply = NULL;
-
- return PAM_SUCCESS;
-
-failed:
- free(reply);
- return PAM_CONV_ERR;
-}
+struct proxy_client_ctx {
+ struct be_req *be_req;
+ struct proxy_auth_ctx *auth_ctx;
+};
static void proxy_reply(struct be_req *req, int dp_err,
int error, const char *errstr);
+static struct tevent_req *proxy_child_send(TALLOC_CTX *mem_ctx,
+ struct proxy_auth_ctx *ctx,
+ struct be_req *be_req);
+static void proxy_child_done(struct tevent_req *child_req);
static void proxy_pam_handler(struct be_req *req) {
- int ret;
- int pam_status;
- pam_handle_t *pamh=NULL;
- struct authtok_conv *auth_data;
- struct pam_conv conv;
struct pam_data *pd;
- struct proxy_auth_ctx *ctx;;
- bool cache_auth_data = false;
+ struct proxy_auth_ctx *ctx;
+ struct tevent_req *child_req = NULL;
+ struct proxy_client_ctx *client_ctx;
pd = talloc_get_type(req->req_data, struct pam_data);
@@ -157,121 +146,771 @@ static void proxy_pam_handler(struct be_req *req) {
return;
}
- conv.conv=proxy_internal_conv;
- auth_data = talloc_zero(req, struct authtok_conv);
- conv.appdata_ptr=auth_data;
+ client_ctx = talloc(req, struct proxy_client_ctx);
+ if (client_ctx == NULL) {
+ proxy_reply(req, DP_ERR_FATAL, ENOMEM, NULL);
+ return;
+ }
+ client_ctx->auth_ctx = ctx;
+ client_ctx->be_req = req;
+
+ /* Queue the request and spawn a child if there
+ * is an available slot.
+ */
+ child_req = proxy_child_send(req, ctx, req);
+ if (child_req == NULL) {
+ /* Could not queue request
+ * Return an error
+ */
+ proxy_reply(req, DP_ERR_FATAL, EINVAL, "Could not queue request\n");
+ return;
+ }
+ tevent_req_set_callback(child_req, proxy_child_done, client_ctx);
+ return;
+}
+
+struct pc_init_ctx;
+struct proxy_child_ctx {
+ struct proxy_auth_ctx *auth_ctx;
+ struct be_req *be_req;
+ struct pam_data *pd;
+
+ uint32_t id;
+ pid_t pid;
+ bool running;
- ret = pam_start(ctx->pam_target, pd->user, &conv, &pamh);
- if (ret == PAM_SUCCESS) {
- DEBUG(1, ("Pam transaction started.\n"));
- ret = pam_set_item(pamh, PAM_TTY, pd->tty);
- if (ret != PAM_SUCCESS) {
- DEBUG(1, ("Setting PAM_TTY failed: %s.\n", pam_strerror(pamh, ret)));
+ struct sbus_connection *conn;
+ struct tevent_timer *timer;
+
+ struct tevent_req *init_req;
+};
+
+static int proxy_child_destructor(TALLOC_CTX *ctx)
+{
+ struct proxy_child_ctx *child_ctx =
+ talloc_get_type(ctx, struct proxy_child_ctx);
+ hash_key_t key;
+
+ DEBUG(8, ("Removing proxy child id [%d]\n", child_ctx->id));
+ key.type = HASH_KEY_ULONG;
+ key.ul = child_ctx->id;
+ hash_delete(child_ctx->auth_ctx->request_table, &key);
+ return 0;
+}
+
+static struct tevent_req *proxy_child_init_send(TALLOC_CTX *mem_ctx,
+ struct proxy_child_ctx *child_ctx,
+ struct proxy_auth_ctx *auth_ctx);
+static void proxy_child_init_done(struct tevent_req *subreq);
+static struct tevent_req *proxy_child_send(TALLOC_CTX *mem_ctx,
+ struct proxy_auth_ctx *auth_ctx,
+ struct be_req *be_req)
+{
+ struct tevent_req *req;
+ struct tevent_req *subreq;
+ struct proxy_child_ctx *state;
+ int hret;
+ hash_key_t key;
+ hash_value_t value;
+ uint32_t first;
+
+ req = tevent_req_create(mem_ctx, &state, struct proxy_child_ctx);
+ if (req == NULL) {
+ DEBUG(1, ("Could not send PAM request to child\n"));
+ return NULL;
+ }
+
+ state->be_req = be_req;
+ state->auth_ctx = auth_ctx;
+ state->pd = talloc_get_type(be_req->req_data, struct pam_data);
+
+ /* Find an available key */
+ key.type = HASH_KEY_ULONG;
+ key.ul = auth_ctx->next_id;
+
+ first = auth_ctx->next_id;
+ while (auth_ctx->next_id == 0 ||
+ hash_has_key(auth_ctx->request_table, &key)) {
+ /* Handle overflow, zero is a reserved value
+ * Also handle the unlikely case where the next ID
+ * is still awaiting being run
+ */
+ auth_ctx->next_id++;
+ key.ul = auth_ctx->next_id;
+
+ if (auth_ctx->next_id == first) {
+ /* We've looped through all possible integers! */
+ DEBUG(0, ("Serious error: queue is too long!\n"));
+ talloc_zfree(req);
+ return NULL;
}
- ret = pam_set_item(pamh, PAM_RUSER, pd->ruser);
- if (ret != PAM_SUCCESS) {
- DEBUG(1, ("Setting PAM_RUSER failed: %s.\n", pam_strerror(pamh, ret)));
+ }
+
+ state->id = auth_ctx->next_id;
+ auth_ctx->next_id++;
+
+ value.type = HASH_VALUE_PTR;
+ value.ptr = req;
+ DEBUG(8, ("Queueing request [%d]\n", key.ul));
+ hret = hash_enter(auth_ctx->request_table,
+ &key, &value);
+ if (hret != HASH_SUCCESS) {
+ DEBUG(1, ("Could not add request to the queue\n"));
+ talloc_zfree(req);
+ return NULL;
+ }
+
+ talloc_set_destructor((TALLOC_CTX *) state,
+ proxy_child_destructor);
+
+ if (auth_ctx->running < auth_ctx->max_children) {
+ /* There's an available slot; start a child
+ * to handle the request
+ */
+
+ auth_ctx->running++;
+ subreq = proxy_child_init_send(auth_ctx, state, auth_ctx);
+ if (!subreq) {
+ DEBUG(1, ("Could not fork child process\n"));
+ auth_ctx->running--;
+ talloc_zfree(req);
+ return NULL;
}
- ret = pam_set_item(pamh, PAM_RHOST, pd->rhost);
- if (ret != PAM_SUCCESS) {
- DEBUG(1, ("Setting PAM_RHOST failed: %s.\n", pam_strerror(pamh, ret)));
+ tevent_req_set_callback(subreq, proxy_child_init_done, req);
+
+ state->running = true;
+ }
+ else {
+ /* If there was no available slot, it will be queued
+ * until a slot is available
+ */
+ DEBUG(8, ("All available child slots are full, queuing request\n"));
+ }
+ return req;
+}
+
+struct pc_init_ctx {
+ char *command;
+ pid_t pid;
+ struct tevent_timer *timeout;
+ struct tevent_signal *sige;
+ struct proxy_child_ctx *child_ctx;
+ struct sbus_connection *conn;
+};
+
+static int pc_init_destructor (TALLOC_CTX *ctx)
+{
+ struct pc_init_ctx *init_ctx =
+ talloc_get_type(ctx, struct pc_init_ctx);
+
+ /* If the init request has died, forcibly kill the child */
+ kill(init_ctx->pid, SIGKILL);
+ return 0;
+}
+
+static void pc_init_sig_handler(struct tevent_context *ev,
+ struct tevent_signal *sige, int signum,
+ int count, void *__siginfo, void *pvt);
+static void pc_init_timeout(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval t, void *ptr);
+static struct tevent_req *proxy_child_init_send(TALLOC_CTX *mem_ctx,
+ struct proxy_child_ctx *child_ctx,
+ struct proxy_auth_ctx *auth_ctx)
+{
+ struct tevent_req *req;
+ struct pc_init_ctx *state;
+ char **proxy_child_args;
+ struct timeval tv;
+ errno_t ret;
+ pid_t pid;
+
+ req = tevent_req_create(mem_ctx, &state, struct pc_init_ctx);
+ if (req == NULL) {
+ DEBUG(1, ("Could not create tevent_req\n"));
+ return NULL;
+ }
+
+ state->child_ctx = child_ctx;
+
+ state->command = talloc_asprintf(req,
+ "%s/proxy_child -d %d%s%s --domain %s --id %d",
+ SSSD_LIBEXEC_PATH, debug_level,
+ (debug_timestamps ? "" : " --debug-timestamps=0"),
+ (debug_to_file ? " --debug-to-files" : ""),
+ auth_ctx->be->domain->name,
+ child_ctx->id);
+ if (state->command == NULL) {
+ DEBUG(1, ("talloc_asprintf failed.\n"));
+ return NULL;
+ }
+
+ DEBUG(7, ("Starting proxy child with args [%s]\n", state->command));
+
+ pid = fork();
+ if (pid < 0) {
+ ret = errno;
+ DEBUG(1, ("fork failed [%d][%s].\n", ret, strerror(ret)));
+ talloc_zfree(req);
+ return NULL;
+ }
+
+ if (pid == 0) { /* child */
+ proxy_child_args = parse_args(state->command);
+ execvp(proxy_child_args[0], proxy_child_args);
+
+ ret = errno;
+ DEBUG(0, ("Could not start proxy child [%s]: [%d][%s].\n",
+ state->command, ret, strerror(ret)));
+
+ _exit(1);
+ }
+
+ else { /* parent */
+ state->pid = pid;
+ /* Make sure to kill the child process if we abort */
+ talloc_set_destructor((TALLOC_CTX *)state, pc_init_destructor);
+
+ state->sige = tevent_add_signal(auth_ctx->be->ev, req,
+ SIGCHLD, SA_SIGINFO,
+ pc_init_sig_handler, req);
+ if (state->sige == NULL) {
+ DEBUG(1, ("tevent_add_signal failed.\n"));
+ talloc_zfree(req);
+ return NULL;
}
- switch (pd->cmd) {
- case SSS_PAM_AUTHENTICATE:
- auth_data->authtok_size = pd->authtok_size;
- auth_data->authtok = pd->authtok;
- pam_status = pam_authenticate(pamh, 0);
- if ((pam_status == PAM_SUCCESS) &&
- (req->be_ctx->domain->cache_credentials)) {
- cache_auth_data = true;
- }
- break;
- case SSS_PAM_SETCRED:
- pam_status=pam_setcred(pamh, 0);
- break;
- case SSS_PAM_ACCT_MGMT:
- pam_status=pam_acct_mgmt(pamh, 0);
- break;
- case SSS_PAM_OPEN_SESSION:
- pam_status=pam_open_session(pamh, 0);
- break;
- case SSS_PAM_CLOSE_SESSION:
- pam_status=pam_close_session(pamh, 0);
- break;
- case SSS_PAM_CHAUTHTOK:
- if (pd->priv != 1) {
- auth_data->authtok_size = pd->authtok_size;
- auth_data->authtok = pd->authtok;
- pam_status = pam_authenticate(pamh, 0);
- if (pam_status != PAM_SUCCESS) break;
- }
- auth_data->authtok_size = pd->newauthtok_size;
- auth_data->authtok = pd->newauthtok;
- pam_status = pam_chauthtok(pamh, 0);
- if ((pam_status == PAM_SUCCESS) &&
- (req->be_ctx->domain->cache_credentials)) {
- cache_auth_data = true;
- }
- break;
- case SSS_PAM_CHAUTHTOK_PRELIM:
- if (pd->priv != 1) {
- auth_data->authtok_size = pd->authtok_size;
- auth_data->authtok = pd->authtok;
- pam_status = pam_authenticate(pamh, 0);
- } else {
- pam_status = PAM_SUCCESS;
- }
- break;
- default:
- DEBUG(1, ("unknown PAM call\n"));
- pam_status=PAM_ABORT;
+
+ /* Save the init request to the child context.
+ * This is technically a layering violation,
+ * but it's the only sane way to be able to
+ * identify which client is which when it
+ * connects to the backend in
+ * client_registration()
+ */
+ child_ctx->init_req = req;
+
+ /* Wait six seconds for the child to connect
+ * This is because the connection handler will add
+ * its own five-second timeout, and we don't want to
+ * be faster here.
+ */
+ tv = tevent_timeval_current_ofs(6, 0);
+ state->timeout = tevent_add_timer(auth_ctx->be->ev, req,
+ tv, pc_init_timeout, req);
+
+ /* processing will continue once the connection is received
+ * in proxy_client_init()
+ */
+ return req;
+ }
+}
+
+static void pc_init_sig_handler(struct tevent_context *ev,
+ struct tevent_signal *sige, int signum,
+ int count, void *__siginfo, void *pvt)
+{
+ int ret;
+ int child_status;
+ struct tevent_req *req;
+ struct pc_init_ctx *init_ctx;
+
+ if (count <= 0) {
+ DEBUG(0, ("SIGCHLD handler called with invalid child count\n"));
+ return;
+ }
+
+ req = talloc_get_type(pvt, struct tevent_req);
+ init_ctx = tevent_req_data(req, struct pc_init_ctx);
+
+ DEBUG(7, ("Waiting for child [%d].\n", init_ctx->pid));
+
+ errno = 0;
+ ret = waitpid(init_ctx->pid, &child_status, WNOHANG);
+
+ if (ret == -1) {
+ ret = errno;
+ DEBUG(1, ("waitpid failed [%d][%s].\n", ret, strerror(ret)));
+ } else if (ret == 0) {
+ DEBUG(1, ("waitpid did not find a child with changed status.\n"));
+ } else {
+ if (WIFEXITED(child_status)) {
+ DEBUG(4, ("child [%d] exited with status [%d].\n", ret,
+ WEXITSTATUS(child_status)));
+ tevent_req_error(req, EIO);
+ } else if (WIFSIGNALED(child_status)) {
+ DEBUG(4, ("child [%d] was terminate by signal [%d].\n", ret,
+ WTERMSIG(child_status)));
+ tevent_req_error(req, EIO);
+ } else {
+ if (WIFSTOPPED(child_status)) {
+ DEBUG(1, ("child [%d] was stopped by signal [%d].\n", ret,
+ WSTOPSIG(child_status)));
+ }
+ if (WIFCONTINUED(child_status)) {
+ DEBUG(1, ("child [%d] was resumed by delivery of SIGCONT.\n",
+ ret));
+ }
+ DEBUG(1, ("Child is still running, no new child is started.\n"));
+ return;
}
+ }
+}
+
+static void pc_init_timeout(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval t, void *ptr)
+{
+ struct tevent_req *req;
+ struct pc_init_ctx *state;
+
+ DEBUG(2, ("Client timed out before Identification!\n"));
+
+ req = talloc_get_type(ptr, struct tevent_req);
+ state = tevent_req_data(req, struct pc_init_ctx);
+
+ tevent_req_error(req, ETIMEDOUT);
+}
+
+static errno_t proxy_child_init_recv(struct tevent_req *req,
+ pid_t *pid,
+ struct sbus_connection **conn)
+{
+ struct pc_init_ctx *state;
+
+ TEVENT_REQ_RETURN_ON_ERROR(req);
+
+ state = tevent_req_data(req, struct pc_init_ctx);
+
+ /* Unset the destructor since we initialized successfully.
+ * We don't want to kill the child now that it's properly
+ * set up.
+ */
+ talloc_set_destructor((TALLOC_CTX *)state, NULL);
+
+ *pid = state->pid;
+ *conn = state->conn;
+
+ return EOK;
+}
+
+struct proxy_child_sig_ctx {
+ struct proxy_auth_ctx *auth_ctx;
+ pid_t pid;
+};
+static void proxy_child_sig_handler(struct tevent_context *ev,
+ struct tevent_signal *sige, int signum,
+ int count, void *__siginfo, void *pvt);
+static struct tevent_req *proxy_pam_conv_send(TALLOC_CTX *mem_ctx,
+ struct proxy_auth_ctx *auth_ctx,
+ struct sbus_connection *conn,
+ struct pam_data *pd,
+ pid_t pid);
+static void proxy_pam_conv_done(struct tevent_req *subreq);
+static void proxy_child_init_done(struct tevent_req *subreq) {
+ int ret;
+ struct tevent_signal *sige;
+ struct tevent_req *req =
+ tevent_req_callback_data(subreq, struct tevent_req);
+ struct proxy_child_ctx *child_ctx =
+ tevent_req_data(req, struct proxy_child_ctx);
+ struct proxy_child_sig_ctx *sig_ctx;
+
+ ret = proxy_child_init_recv(subreq, &child_ctx->pid, &child_ctx->conn);
+ talloc_zfree(subreq);
+ if (ret != EOK) {
+ DEBUG(6, ("Proxy child init failed [%d]\n", ret));
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ /* An initialized child is available, awaiting the PAM command */
+ subreq = proxy_pam_conv_send(req, child_ctx->auth_ctx,
+ child_ctx->conn, child_ctx->pd,
+ child_ctx->pid);
+ if (!subreq) {
+ DEBUG(1,("Could not start PAM conversation\n"));
+ tevent_req_error(req, EIO);
+ return;
+ }
+ tevent_req_set_callback(subreq, proxy_pam_conv_done, req);
+
+ /* Add a signal handler for the child under the auth_ctx,
+ * that way if the child exits after completion of the
+ * request, it will still be handled.
+ */
+ sig_ctx = talloc_zero(child_ctx->auth_ctx, struct proxy_child_sig_ctx);
+ if(sig_ctx == NULL) {
+ DEBUG(1, ("tevent_add_signal failed.\n"));
+ tevent_req_error(req, ENOMEM);
+ return;
+ }
+ sig_ctx->auth_ctx = child_ctx->auth_ctx;
+ sig_ctx->pid = child_ctx->pid;
+
+ sige = tevent_add_signal(child_ctx->auth_ctx->be->ev,
+ child_ctx->auth_ctx,
+ SIGCHLD, SA_SIGINFO,
+ proxy_child_sig_handler,
+ sig_ctx);
+ if (sige == NULL) {
+ DEBUG(1, ("tevent_add_signal failed.\n"));
+ tevent_req_error(req, ENOMEM);
+ return;
+ }
+
+ /* Steal the signal context onto the signal event
+ * so that when the signal is freed, the context
+ * will go with it.
+ */
+ talloc_steal(sige, sig_ctx);
+}
+
+static void remove_sige(struct tevent_context *ev,
+ struct tevent_immediate *imm,
+ void *pvt);
+static void run_proxy_child_queue(struct tevent_context *ev,
+ struct tevent_immediate *imm,
+ void *pvt);
+static void proxy_child_sig_handler(struct tevent_context *ev,
+ struct tevent_signal *sige, int signum,
+ int count, void *__siginfo, void *pvt)
+{
+ int ret;
+ int child_status;
+ struct proxy_child_sig_ctx *sig_ctx;
+ struct tevent_immediate *imm;
+ struct tevent_immediate *imm2;
+
+ if (count <= 0) {
+ DEBUG(0, ("SIGCHLD handler called with invalid child count\n"));
+ return;
+ }
+
+ sig_ctx = talloc_get_type(pvt, struct proxy_child_sig_ctx);
+ DEBUG(7, ("Waiting for child [%d].\n", sig_ctx->pid));
- DEBUG(4, ("Pam result: [%d][%s]\n", pam_status,
- pam_strerror(pamh, pam_status)));
+ errno = 0;
+ ret = waitpid(sig_ctx->pid, &child_status, WNOHANG);
- if (pam_status == PAM_AUTHINFO_UNAVAIL) {
- be_mark_offline(req->be_ctx);
+ if (ret == -1) {
+ ret = errno;
+ DEBUG(1, ("waitpid failed [%d][%s].\n", ret, strerror(ret)));
+ } else if (ret == 0) {
+ DEBUG(1, ("waitpid did not found a child with changed status.\n"));
+ } else {
+ if (WIFEXITED(child_status)) {
+ DEBUG(4, ("child [%d] exited with status [%d].\n", ret,
+ WEXITSTATUS(child_status)));
+ } else if (WIFSIGNALED(child_status)) {
+ DEBUG(4, ("child [%d] was terminated by signal [%d].\n", ret,
+ WTERMSIG(child_status)));
+ } else {
+ if (WIFSTOPPED(child_status)) {
+ DEBUG(1, ("child [%d] was stopped by signal [%d].\n", ret,
+ WSTOPSIG(child_status)));
+ }
+ if (WIFCONTINUED(child_status)) {
+ DEBUG(1, ("child [%d] was resumed by delivery of SIGCONT.\n",
+ ret));
+ }
+ DEBUG(1, ("Child is still running, no new child is started.\n"));
+ return;
}
- ret = pam_end(pamh, pam_status);
- if (ret != PAM_SUCCESS) {
- pamh=NULL;
- DEBUG(1, ("Cannot terminate pam transaction.\n"));
+ imm = tevent_create_immediate(ev);
+ if (imm == NULL) {
+ DEBUG(1, ("tevent_create_immediate failed.\n"));
+ return;
}
- } else {
- DEBUG(1, ("Failed to initialize pam transaction.\n"));
- pam_status = PAM_SYSTEM_ERR;
+ tevent_schedule_immediate(imm, ev, run_proxy_child_queue,
+ sig_ctx->auth_ctx);
+
+ /* schedule another immediate timer to delete the sigchld handler */
+ imm2 = tevent_create_immediate(ev);
+ if (imm == NULL) {
+ DEBUG(1, ("tevent_create_immediate failed.\n"));
+ return;
+ }
+
+ tevent_schedule_immediate(imm2, ev, remove_sige, sige);
+ }
+
+ return;
+}
+
+static void remove_sige(struct tevent_context *ev,
+ struct tevent_immediate *imm,
+ void *pvt)
+{
+ talloc_free(pvt);
+}
+
+struct proxy_conv_ctx {
+ struct proxy_auth_ctx *auth_ctx;
+ struct sbus_connection *conn;
+ struct pam_data *pd;
+ pid_t pid;
+};
+static void proxy_pam_conv_reply(DBusPendingCall *pending, void *ptr);
+static struct tevent_req *proxy_pam_conv_send(TALLOC_CTX *mem_ctx,
+ struct proxy_auth_ctx *auth_ctx,
+ struct sbus_connection *conn,
+ struct pam_data *pd,
+ pid_t pid)
+{
+ errno_t ret;
+ bool dp_ret;
+ DBusMessage *msg;
+ struct tevent_req *req;
+ struct proxy_conv_ctx *state;
+
+ req = tevent_req_create(mem_ctx, &state, struct proxy_conv_ctx);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->auth_ctx = auth_ctx;
+ state->conn = conn;
+ state->pd = pd;
+ state->pid = pid;
+
+ msg = dbus_message_new_method_call(NULL,
+ DP_PATH,
+ DP_INTERFACE,
+ DP_METHOD_PAMHANDLER);
+ if (msg == NULL) {
+ DEBUG(1, ("dbus_message_new_method_call failed.\n"));
+ talloc_zfree(req);
+ return NULL;
+ }
+
+ DEBUG(4, ("Sending request with the following data:\n"));
+ DEBUG_PAM_DATA(4, pd);
+
+ dp_ret = dp_pack_pam_request(msg, pd);
+ if (!dp_ret) {
+ DEBUG(1, ("Failed to build message\n"));
+ dbus_message_unref(msg);
+ talloc_zfree(req);
+ return NULL;
+ }
+
+ ret = sbus_conn_send(state->conn, msg, state->auth_ctx->timeout_ms,
+ proxy_pam_conv_reply, req, NULL);
+ if (ret != EOK) {
+ dbus_message_unref(msg);
+ talloc_zfree(req);
+ return NULL;
+ }
+
+ dbus_message_unref(msg);
+ return req;
+}
+
+static void proxy_pam_conv_reply(DBusPendingCall *pending, void *ptr)
+{
+ struct tevent_req *req;
+ struct proxy_conv_ctx *state;
+ DBusError dbus_error;
+ DBusMessage *reply;
+ int type;
+ int ret;
+
+ DEBUG(8, ("Handling pam conversation reply\n"));
+
+ req = talloc_get_type(ptr, struct tevent_req);
+ state = tevent_req_data(req, struct proxy_conv_ctx);
+
+ dbus_error_init(&dbus_error);
+
+ reply = dbus_pending_call_steal_reply(pending);
+ dbus_pending_call_unref(pending);
+ if (reply == NULL) {
+ DEBUG(0, ("Severe error. A reply callback was called but no reply was"
+ "received and no timeout occurred\n"));
+ state->pd->pam_status = PAM_SYSTEM_ERR;
+ tevent_req_error(req, EIO);
+ }
+
+ type = dbus_message_get_type(reply);
+ switch (type) {
+ case DBUS_MESSAGE_TYPE_METHOD_RETURN:
+ ret = dp_unpack_pam_response(reply, state->pd, &dbus_error);
+ if (!ret) {
+ DEBUG(0, ("Failed to parse reply.\n"));
+ state->pd->pam_status = PAM_SYSTEM_ERR;
+ dbus_message_unref(reply);
+ tevent_req_error(req, EIO);
+ return;
+ }
+ DEBUG(4, ("received: [%d][%s]\n",
+ state->pd->pam_status,
+ state->pd->domain));
+ break;
+ case DBUS_MESSAGE_TYPE_ERROR:
+ DEBUG(0, ("Reply error [%s].\n",
+ dbus_message_get_error_name(reply)));
+ state->pd->pam_status = PAM_SYSTEM_ERR;
+ break;
+ default:
+ DEBUG(0, ("Default... what now?.\n"));
+ state->pd->pam_status = PAM_SYSTEM_ERR;
+ }
+ dbus_message_unref(reply);
+
+ /* Kill the child */
+ kill(state->pid, SIGKILL);
+
+ /* Conversation is finished */
+ tevent_req_done(req);
+}
+
+static errno_t proxy_pam_conv_recv(struct tevent_req *req)
+{
+ TEVENT_REQ_RETURN_ON_ERROR(req);
+
+ return EOK;
+}
+
+static void proxy_pam_conv_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req;
+ int ret;
+
+ req = tevent_req_callback_data(subreq, struct tevent_req);
+
+ ret = proxy_pam_conv_recv(subreq);
+ talloc_zfree(subreq);
+ if (ret != EOK) {
+ DEBUG(6, ("Proxy PAM conversation failed [%d]\n", ret));
+ tevent_req_error(req, ret);
+ return;
}
- pd->pam_status = pam_status;
+ tevent_req_done(req);
+}
+
+static int proxy_child_recv(struct tevent_req *req,
+ TALLOC_CTX *mem_ctx,
+ struct pam_data **pd)
+{
+ struct proxy_child_ctx *ctx;
+
+ TEVENT_REQ_RETURN_ON_ERROR(req);
- if (cache_auth_data) {
- char *password;
+ ctx = tevent_req_data(req, struct proxy_child_ctx);
+ *pd = talloc_steal(mem_ctx, ctx->pd);
- password = talloc_size(req, auth_data->authtok_size + 1);
+ return EOK;
+}
+
+static void proxy_child_done(struct tevent_req *req)
+{
+ struct proxy_client_ctx *client_ctx =
+ tevent_req_callback_data(req, struct proxy_client_ctx);
+ struct pam_data *pd;
+ char *password;
+ int ret;
+ struct tevent_immediate *imm;
+
+ ret = proxy_child_recv(req, client_ctx, &pd);
+ talloc_zfree(req);
+ if (ret != EOK) {
+ /* Pam child failed */
+ client_ctx->auth_ctx->running--;
+ proxy_reply(client_ctx->be_req, DP_ERR_FATAL, ret,
+ "PAM child failed");
+
+ /* Start the next auth in the queue, if any */
+ imm = tevent_create_immediate(client_ctx->be_req->be_ctx->ev);
+ if (imm == NULL) {
+ DEBUG(1, ("tevent_create_immediate failed.\n"));
+ return;
+ }
+
+ tevent_schedule_immediate(imm,
+ client_ctx->be_req->be_ctx->ev,
+ run_proxy_child_queue,
+ client_ctx->auth_ctx);
+ return;
+ }
+
+ /* Check if we need to save the cached credentials */
+ if ((pd->cmd == SSS_PAM_AUTHENTICATE || pd->cmd == SSS_PAM_CHAUTHTOK) &&
+ pd->pam_status == PAM_SUCCESS &&
+ client_ctx->be_req->be_ctx->domain->cache_credentials) {
+ password = talloc_strndup(client_ctx->be_req,
+ (char *) pd->authtok,
+ pd->authtok_size);
if (!password) {
/* password caching failures are not fatal errors */
- return proxy_reply(req, DP_ERR_OK, EOK, NULL);
+ DEBUG(2, ("Failed to cache password\n"));
+ goto done;
}
- memcpy(password, auth_data->authtok, auth_data->authtok_size);
- password[auth_data->authtok_size] = '\0';
talloc_set_destructor((TALLOC_CTX *)password, password_destructor);
- ret = sysdb_cache_password(req, req->be_ctx->sysdb,
- req->be_ctx->domain,
+ ret = sysdb_cache_password(client_ctx,
+ client_ctx->be_req->be_ctx->sysdb,
+ client_ctx->be_req->be_ctx->domain,
pd->user, password);
/* password caching failures are not fatal errors */
/* so we just log it any return */
- if (ret) {
+ if (ret != EOK) {
DEBUG(2, ("Failed to cache password (%d)[%s]!?\n",
ret, strerror(ret)));
}
}
- proxy_reply(req, DP_ERR_OK, EOK, NULL);
+done:
+ proxy_reply(client_ctx->be_req, DP_ERR_OK, EOK, NULL);
+}
+
+static void run_proxy_child_queue(struct tevent_context *ev,
+ struct tevent_immediate *imm,
+ void *pvt)
+{
+ struct proxy_auth_ctx *auth_ctx;
+ struct hash_iter_context_t *iter;
+ struct hash_entry_t *entry;
+ struct tevent_req *req;
+ struct tevent_req *subreq;
+ struct proxy_child_ctx *state;
+
+ auth_ctx = talloc_get_type(pvt, struct proxy_auth_ctx);
+
+ /* Launch next queued request */
+ iter = new_hash_iter_context(auth_ctx->request_table);
+ while ((entry = iter->next(iter)) != NULL) {
+ req = talloc_get_type(entry->value.ptr, struct tevent_req);
+ state = tevent_req_data(req, struct proxy_child_ctx);
+ if (!state->running) {
+ break;
+ }
+ }
+
+ if (!entry) {
+ /* Nothing pending on the queue */
+ return;
+ }
+
+ if (auth_ctx->running < auth_ctx->max_children) {
+ /* There's an available slot; start a child
+ * to handle the request
+ */
+ auth_ctx->running++;
+ subreq = proxy_child_init_send(auth_ctx, state, auth_ctx);
+ if (!subreq) {
+ DEBUG(1, ("Could not fork child process\n"));
+ auth_ctx->running--;
+ talloc_zfree(req);
+ return;
+ }
+ tevent_req_set_callback(subreq, proxy_child_init_done, req);
+
+ state->running = true;
+ }
}
static void proxy_reply(struct be_req *req, int dp_err,
@@ -1599,17 +2238,203 @@ done:
return ret;
}
+struct proxy_client {
+ struct proxy_auth_ctx *proxy_auth_ctx;
+ struct sbus_connection *conn;
+ struct tevent_timer *timeout;
+ bool initialized;
+};
+
+static void init_timeout(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval t, void *ptr);
+static int proxy_client_init(struct sbus_connection *conn, void *data)
+{
+ struct proxy_auth_ctx *proxy_auth_ctx;
+ struct proxy_client *proxy_cli;
+ struct timeval tv;
+
+ proxy_auth_ctx = talloc_get_type(data, struct proxy_auth_ctx);
+
+ /* hang off this memory to the connection so that when the connection
+ * is freed we can potentially call a destructor */
+
+ proxy_cli = talloc_zero(conn, struct proxy_client);
+ if (!proxy_cli) {
+ DEBUG(0,("Out of memory?!\n"));
+ talloc_zfree(conn);
+ return ENOMEM;
+ }
+ proxy_cli->proxy_auth_ctx = proxy_auth_ctx;
+ proxy_cli->conn = conn;
+ proxy_cli->initialized = false;
+
+ /* 5 seconds should be plenty */
+ tv = tevent_timeval_current_ofs(5, 0);
+
+ proxy_cli->timeout = tevent_add_timer(proxy_auth_ctx->be->ev, proxy_cli,
+ tv, init_timeout, proxy_cli);
+ if (!proxy_cli->timeout) {
+ DEBUG(0,("Out of memory?!\n"));
+ talloc_zfree(conn);
+ return ENOMEM;
+ }
+ DEBUG(4, ("Set-up proxy client ID timeout [%p]\n", proxy_cli->timeout));
+
+ /* Attach the client context to the connection context, so that it is
+ * always available when we need to manage the connection. */
+ sbus_conn_set_private_data(conn, proxy_cli);
+
+ return EOK;
+}
+
+static void init_timeout(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval t, void *ptr)
+{
+ struct proxy_client *proxy_cli;
+
+ DEBUG(2, ("Client timed out before Identification [%p]!\n", te));
+
+ proxy_cli = talloc_get_type(ptr, struct proxy_client);
+
+ sbus_disconnect(proxy_cli->conn);
+ talloc_zfree(proxy_cli);
+
+ /* If we time out here, we will also time out to
+ * pc_init_timeout(), so we'll finish the request
+ * there.
+ */
+}
+
+static int client_registration(DBusMessage *message,
+ struct sbus_connection *conn)
+{
+ dbus_uint16_t version = DATA_PROVIDER_VERSION;
+ struct proxy_client *proxy_cli;
+ DBusMessage *reply;
+ DBusError dbus_error;
+ dbus_uint16_t cli_ver;
+ uint32_t cli_id;
+ dbus_bool_t dbret;
+ void *data;
+ int hret;
+ hash_key_t key;
+ hash_value_t value;
+ struct tevent_req *req;
+ struct proxy_child_ctx *child_ctx;
+ struct pc_init_ctx *init_ctx;
+
+ data = sbus_conn_get_private_data(conn);
+ proxy_cli = talloc_get_type(data, struct proxy_client);
+ if (!proxy_cli) {
+ DEBUG(0, ("Connection holds no valid init data\n"));
+ return EINVAL;
+ }
+
+ /* First thing, cancel the timeout */
+ DEBUG(4, ("Cancel proxy client ID timeout [%p]\n", proxy_cli->timeout));
+ talloc_zfree(proxy_cli->timeout);
+
+ dbus_error_init(&dbus_error);
+
+ dbret = dbus_message_get_args(message, &dbus_error,
+ DBUS_TYPE_UINT16, &cli_ver,
+ DBUS_TYPE_UINT32, &cli_id,
+ DBUS_TYPE_INVALID);
+ if (!dbret) {
+ DEBUG(1, ("Failed to parse message, killing connection\n"));
+ if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
+ sbus_disconnect(conn);
+ /* FIXME: should we just talloc_zfree(conn) ? */
+ return EIO;
+ }
+
+ DEBUG(4, ("Proxy client [%ld] connected\n", cli_id));
+
+ /* Check the hash table */
+ key.type = HASH_KEY_ULONG;
+ key.ul = cli_id;
+ if (!hash_has_key(proxy_cli->proxy_auth_ctx->request_table, &key)) {
+ DEBUG(1, ("Unknown child ID. Killing the connection\n"));
+ sbus_disconnect(proxy_cli->conn);
+ return EIO;
+ }
+
+ /* reply that all is ok */
+ reply = dbus_message_new_method_return(message);
+ if (!reply) {
+ DEBUG(0, ("Dbus Out of memory!\n"));
+ return ENOMEM;
+ }
+
+ dbret = dbus_message_append_args(reply,
+ DBUS_TYPE_UINT16, &version,
+ DBUS_TYPE_INVALID);
+ if (!dbret) {
+ DEBUG(0, ("Failed to build dbus reply\n"));
+ dbus_message_unref(reply);
+ sbus_disconnect(conn);
+ return EIO;
+ }
+
+ /* send reply back */
+ sbus_conn_send_reply(conn, reply);
+ dbus_message_unref(reply);
+
+ hret = hash_lookup(proxy_cli->proxy_auth_ctx->request_table, &key, &value);
+ if (hret != HASH_SUCCESS) {
+ DEBUG(1, ("Hash error [%d][%s]\n", hret, hash_error_string(hret)));
+ sbus_disconnect(conn);
+ }
+
+ /* Signal that the child is up and ready to receive the request */
+ req = talloc_get_type(value.ptr, struct tevent_req);
+ child_ctx = tevent_req_data(req, struct proxy_child_ctx);
+
+ if (!child_ctx->running) {
+ /* This should hopefully be impossible, but protect
+ * against it anyway. If we're not marked running, then
+ * the init_req will be NULL below and things will
+ * break.
+ */
+ DEBUG(1, ("Client connection from a request "
+ "that's not marked as running\n"));
+ return EIO;
+ }
+
+ init_ctx = tevent_req_data(child_ctx->init_req, struct pc_init_ctx);
+ init_ctx->conn = conn;
+ tevent_req_done(child_ctx->init_req);
+ child_ctx->init_req = NULL;
+
+ return EOK;
+}
+
int sssm_proxy_auth_init(struct be_ctx *bectx,
struct bet_ops **ops, void **pvt_data)
{
struct proxy_auth_ctx *ctx;
int ret;
+ int hret;
+ char *sbus_address;
- ctx = talloc(bectx, struct proxy_auth_ctx);
+ /* If we're already set up, just return that */
+ if(bectx->bet_info[BET_AUTH].mod_name &&
+ strcmp("proxy", bectx->bet_info[BET_AUTH].mod_name) == 0) {
+ DEBUG(8, ("Re-using proxy_auth_ctx for this provider\n"));
+ *ops = bectx->bet_info[BET_AUTH].bet_ops;
+ *pvt_data = bectx->bet_info[BET_AUTH].pvt_bet_data;
+ return EOK;
+ }
+
+ ctx = talloc_zero(bectx, struct proxy_auth_ctx);
if (!ctx) {
return ENOMEM;
}
ctx->be = bectx;
+ ctx->timeout_ms = SSS_CLI_SOCKET_TIMEOUT/4;
+ ctx->next_id = 1;
ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path,
CONFDB_PROXY_PAM_TARGET, NULL,
@@ -1621,6 +2446,33 @@ int sssm_proxy_auth_init(struct be_ctx *bectx,
goto done;
}
+ sbus_address = talloc_asprintf(ctx, "unix:path=%s/%s_%s", PIPE_PATH,
+ PROXY_CHILD_PIPE, bectx->domain->name);
+ if (sbus_address == NULL) {
+ DEBUG(1, ("talloc_asprintf failed.\n"));
+ ret = ENOMEM;
+ goto done;
+ }
+
+ ret = sbus_new_server(ctx, bectx->ev, sbus_address, &proxy_interface,
+ &ctx->sbus_srv, proxy_client_init, ctx);
+ if (ret != EOK) {
+ DEBUG(0, ("Could not set up sbus server.\n"));
+ goto done;
+ }
+
+ /* Set up request hash table */
+ /* FIXME: get max_children from configuration file */
+ ctx->max_children = 10;
+
+ hret = hash_create(ctx->max_children * 2, &ctx->request_table,
+ NULL, NULL);
+ if (hret != HASH_SUCCESS) {
+ DEBUG(0, ("Could not initialize request table\n"));
+ ret = EIO;
+ goto done;
+ }
+
*ops = &proxy_auth_ops;
*pvt_data = ctx;
diff --git a/src/providers/proxy/proxy.h b/src/providers/proxy/proxy.h
new file mode 100644
index 00000000..d95e50ef
--- /dev/null
+++ b/src/providers/proxy/proxy.h
@@ -0,0 +1,30 @@
+/*
+ SSSD
+
+ Proxy provider, private header file
+
+ Authors:
+ Sumit Bose <sbose@redhat.com>
+
+ Copyright (C) 2010 Red Hat
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __PROXY_H__
+#define __PROXY_H__
+
+#define PROXY_CHILD_PIPE "private/proxy_child"
+
+#endif /* __PROXY_H__ */
diff --git a/src/providers/proxy/proxy_child.c b/src/providers/proxy/proxy_child.c
new file mode 100644
index 00000000..c8f1eeb5
--- /dev/null
+++ b/src/providers/proxy/proxy_child.c
@@ -0,0 +1,507 @@
+/*
+ SSSD
+
+ Pam Proxy Child
+
+ Authors:
+
+ Sumit Bose <sbose@redhat.com>
+
+ Copyright (C) 2010 Red Hat
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <string.h>
+#include <sys/time.h>
+#include <errno.h>
+#include <dlfcn.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_modules.h>
+
+#include "popt.h"
+#include "util/util.h"
+#include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "providers/proxy/proxy.h"
+
+#include "providers/dp_backend.h"
+
+static int pc_pam_handler(DBusMessage *message, struct sbus_connection *conn);
+
+struct sbus_method pc_methods[] = {
+ { DP_METHOD_PAMHANDLER, pc_pam_handler },
+ { NULL, NULL }
+};
+
+struct sbus_interface pc_interface = {
+ DP_INTERFACE,
+ DP_PATH,
+ SBUS_DEFAULT_VTABLE,
+ pc_methods,
+ NULL
+};
+
+struct pc_ctx {
+ struct tevent_context *ev;
+ struct confdb_ctx *cdb;
+ struct sss_domain_info *domain;
+ const char *identity;
+ const char *conf_path;
+ struct sbus_connection *mon_conn;
+ struct sbus_connection *conn;
+ const char *pam_target;
+ uint32_t id;
+};
+
+struct authtok_conv {
+ uint32_t authtok_size;
+ uint8_t *authtok;
+};
+
+static int proxy_internal_conv(int num_msg, const struct pam_message **msgm,
+ struct pam_response **response,
+ void *appdata_ptr) {
+ int i;
+ struct pam_response *reply;
+ struct authtok_conv *auth_data;
+
+ auth_data = talloc_get_type(appdata_ptr, struct authtok_conv);
+
+ if (num_msg <= 0) return PAM_CONV_ERR;
+
+ reply = (struct pam_response *) calloc(num_msg,
+ sizeof(struct pam_response));
+ if (reply == NULL) return PAM_CONV_ERR;
+
+ for (i=0; i < num_msg; i++) {
+ switch( msgm[i]->msg_style ) {
+ case PAM_PROMPT_ECHO_OFF:
+ DEBUG(4, ("Conversation message: [%s]\n", msgm[i]->msg));
+ reply[i].resp_retcode = 0;
+ reply[i].resp = calloc(auth_data->authtok_size + 1,
+ sizeof(char));
+ if (reply[i].resp == NULL) goto failed;
+ memcpy(reply[i].resp, auth_data->authtok,
+ auth_data->authtok_size);
+
+ break;
+ default:
+ DEBUG(1, ("Conversation style %d not supported.\n",
+ msgm[i]->msg_style));
+ goto failed;
+ }
+ }
+
+ *response = reply;
+ reply = NULL;
+
+ return PAM_SUCCESS;
+
+failed:
+ free(reply);
+ return PAM_CONV_ERR;
+}
+
+static errno_t call_pam_stack(const char *pam_target, struct pam_data *pd)
+{
+ int ret;
+ int pam_status;
+ pam_handle_t *pamh=NULL;
+ struct authtok_conv *auth_data;
+ struct pam_conv conv;
+
+ conv.conv=proxy_internal_conv;
+ auth_data = talloc_zero(pd, struct authtok_conv);
+ conv.appdata_ptr=auth_data;
+
+ ret = pam_start(pam_target, pd->user, &conv, &pamh);
+ if (ret == PAM_SUCCESS) {
+ DEBUG(7, ("Pam transaction started with service name [%s].\n",
+ pam_target));
+ ret = pam_set_item(pamh, PAM_TTY, pd->tty);
+ if (ret != PAM_SUCCESS) {
+ DEBUG(1, ("Setting PAM_TTY failed: %s.\n",
+ pam_strerror(pamh, ret)));
+ }
+ ret = pam_set_item(pamh, PAM_RUSER, pd->ruser);
+ if (ret != PAM_SUCCESS) {
+ DEBUG(1, ("Setting PAM_RUSER failed: %s.\n",
+ pam_strerror(pamh, ret)));
+ }
+ ret = pam_set_item(pamh, PAM_RHOST, pd->rhost);
+ if (ret != PAM_SUCCESS) {
+ DEBUG(1, ("Setting PAM_RHOST failed: %s.\n",
+ pam_strerror(pamh, ret)));
+ }
+ switch (pd->cmd) {
+ case SSS_PAM_AUTHENTICATE:
+ auth_data->authtok_size = pd->authtok_size;
+ auth_data->authtok = pd->authtok;
+ pam_status = pam_authenticate(pamh, 0);
+ break;
+ case SSS_PAM_SETCRED:
+ pam_status=pam_setcred(pamh, 0);
+ break;
+ case SSS_PAM_ACCT_MGMT:
+ pam_status=pam_acct_mgmt(pamh, 0);
+ break;
+ case SSS_PAM_OPEN_SESSION:
+ pam_status=pam_open_session(pamh, 0);
+ break;
+ case SSS_PAM_CLOSE_SESSION:
+ pam_status=pam_close_session(pamh, 0);
+ break;
+ case SSS_PAM_CHAUTHTOK:
+ if (pd->priv != 1) {
+ auth_data->authtok_size = pd->authtok_size;
+ auth_data->authtok = pd->authtok;
+ pam_status = pam_authenticate(pamh, 0);
+ if (pam_status != PAM_SUCCESS) break;
+ }
+ auth_data->authtok_size = pd->newauthtok_size;
+ auth_data->authtok = pd->newauthtok;
+ pam_status = pam_chauthtok(pamh, 0);
+ break;
+ case SSS_PAM_CHAUTHTOK_PRELIM:
+ if (pd->priv != 1) {
+ auth_data->authtok_size = pd->authtok_size;
+ auth_data->authtok = pd->authtok;
+ pam_status = pam_authenticate(pamh, 0);
+ } else {
+ pam_status = PAM_SUCCESS;
+ }
+ break;
+ default:
+ DEBUG(1, ("unknown PAM call\n"));
+ pam_status=PAM_ABORT;
+ }
+
+ DEBUG(4, ("Pam result: [%d][%s]\n", pam_status,
+ pam_strerror(pamh, pam_status)));
+
+ ret = pam_end(pamh, pam_status);
+ if (ret != PAM_SUCCESS) {
+ pamh=NULL;
+ DEBUG(1, ("Cannot terminate pam transaction.\n"));
+ }
+
+ } else {
+ DEBUG(1, ("Failed to initialize pam transaction.\n"));
+ pam_status = PAM_SYSTEM_ERR;
+ }
+
+ pd->pam_status = pam_status;
+
+ return EOK;
+}
+
+static int pc_pam_handler(DBusMessage *message, struct sbus_connection *conn)
+{
+ DBusError dbus_error;
+ DBusMessage *reply;
+ struct pc_ctx *pc_ctx;
+ errno_t ret;
+ void *user_data;
+ struct pam_data *pd = NULL;
+
+ user_data = sbus_conn_get_private_data(conn);
+ if (!user_data) {
+ ret = EINVAL;
+ goto done;
+ }
+ pc_ctx = talloc_get_type(user_data, struct pc_ctx);
+ if (!pc_ctx) {
+ ret = EINVAL;
+ goto done;
+ }
+
+ reply = dbus_message_new_method_return(message);
+ if (!reply) {
+ DEBUG(1, ("dbus_message_new_method_return failed, "
+ "cannot send reply.\n"));
+ ret = ENOMEM;
+ goto done;
+ }
+
+ dbus_error_init(&dbus_error);
+
+ ret = dp_unpack_pam_request(message, pc_ctx, &pd, &dbus_error);
+ if (!ret) {
+ DEBUG(1,("Failed, to parse message!\n"));
+ ret = EIO;
+ goto done;
+ }
+
+ pd->pam_status = PAM_SYSTEM_ERR;
+ pd->domain = talloc_strdup(pd, pc_ctx->domain->name);
+ if (pd->domain == NULL) {
+ talloc_free(pd);
+ ret = ENOMEM;
+ goto done;
+ }
+
+ DEBUG(4, ("Got request with the following data\n"));
+ DEBUG_PAM_DATA(4, pd);
+
+ ret = call_pam_stack(pc_ctx->pam_target, pd);
+ if (ret != EOK) {
+ DEBUG(1, ("call_pam_stack failed.\n"));
+ }
+
+ DEBUG(4, ("Sending result [%d][%s]\n",
+ pd->pam_status, pd->domain));
+
+ ret = dp_pack_pam_response(reply, pd);
+ if (!ret) {
+ DEBUG(1, ("Failed to generate dbus reply\n"));
+ talloc_free(pd);
+ dbus_message_unref(reply);
+ ret = EIO;
+ goto done;
+ }
+
+ sbus_conn_send_reply(conn, reply);
+ dbus_message_unref(reply);
+ talloc_free(pd);
+
+ /* We'll return the message and let the
+ * parent process kill us.
+ */
+ return EOK;
+
+done:
+ exit(ret);
+}
+
+int proxy_child_send_id(struct sbus_connection *conn,
+ uint16_t version,
+ uint32_t id);
+static int proxy_cli_init(struct pc_ctx *ctx)
+{
+ char *sbus_address;
+ int ret;
+
+ sbus_address = talloc_asprintf(ctx, "unix:path=%s/%s_%s",
+ PIPE_PATH, PROXY_CHILD_PIPE,
+ ctx->domain->name);
+ if (sbus_address == NULL) {
+ DEBUG(1, ("talloc_asprintf failed.\n"));
+ return ENOMEM;
+ }
+
+ ret = sbus_client_init(ctx, ctx->ev, sbus_address,
+ &pc_interface, &ctx->conn,
+ NULL, ctx);
+ if (ret != EOK) {
+ DEBUG(1, ("sbus_client_init failed.\n"));
+ return ret;
+ }
+
+ ret = proxy_child_send_id(ctx->conn, DATA_PROVIDER_VERSION, ctx->id);
+ if (ret != EOK) {
+ DEBUG(0, ("dp_common_send_id failed.\n"));
+ return ret;
+ }
+
+ return EOK;
+}
+
+int proxy_child_send_id(struct sbus_connection *conn,
+ uint16_t version,
+ uint32_t id)
+{
+ DBusMessage *msg;
+ dbus_bool_t ret;
+ int retval;
+
+ /* create the message */
+ msg = dbus_message_new_method_call(NULL,
+ DP_PATH,
+ DP_INTERFACE,
+ DP_METHOD_REGISTER);
+ if (msg == NULL) {
+ DEBUG(0, ("Out of memory?!\n"));
+ return ENOMEM;
+ }
+
+ DEBUG(4, ("Sending ID to Proxy Backend: (%d,%ld)\n",
+ version, id));
+
+ ret = dbus_message_append_args(msg,
+ DBUS_TYPE_UINT16, &version,
+ DBUS_TYPE_UINT32, &id,
+ DBUS_TYPE_INVALID);
+ if (!ret) {
+ DEBUG(1, ("Failed to build message\n"));
+ return EIO;
+ }
+
+ retval = sbus_conn_send(conn, msg, 30000, dp_id_callback, NULL, NULL);
+
+ dbus_message_unref(msg);
+ return retval;
+}
+
+int proxy_child_process_init(TALLOC_CTX *mem_ctx, const char *domain,
+ struct tevent_context *ev, struct confdb_ctx *cdb,
+ const char *pam_target, uint32_t id)
+{
+ struct pc_ctx *ctx;
+ int ret;
+
+ ctx = talloc_zero(mem_ctx, struct pc_ctx);
+ if (!ctx) {
+ DEBUG(0, ("fatal error initializing pc_ctx\n"));
+ return ENOMEM;
+ }
+ ctx->ev = ev;
+ ctx->cdb = cdb;
+ ctx->pam_target = talloc_steal(ctx, pam_target);
+ ctx->id = id;
+ ctx->conf_path = talloc_asprintf(ctx, CONFDB_DOMAIN_PATH_TMPL, domain);
+ if (!ctx->conf_path) {
+ DEBUG(0, ("Out of memory!?\n"));
+ return ENOMEM;
+ }
+
+ ret = confdb_get_domain(cdb, domain, &ctx->domain);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error retrieving domain configuration\n"));
+ return ret;
+ }
+
+ ret = proxy_cli_init(ctx);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error setting up server bus\n"));
+ return ret;
+ }
+
+ return EOK;
+}
+
+int main(int argc, const char *argv[])
+{
+ int opt;
+ poptContext pc;
+ char *domain = NULL;
+ char *srv_name = NULL;
+ char *conf_entry = NULL;
+ struct main_context *main_ctx;
+ int ret;
+ long id;
+ char *pam_target = NULL;
+
+ struct poptOption long_options[] = {
+ POPT_AUTOHELP
+ SSSD_MAIN_OPTS
+ {"domain", 0, POPT_ARG_STRING, &domain, 0,
+ _("Domain of the information provider (mandatory)"), NULL },
+ {"id", 0, POPT_ARG_LONG, &id, 0,
+ _("Child identifier (mandatory)"), NULL },
+ POPT_TABLEEND
+ };
+
+ pc = poptGetContext(argv[0], argc, argv, long_options, 0);
+ while((opt = poptGetNextOpt(pc)) != -1) {
+ switch(opt) {
+ default:
+ fprintf(stderr, "\nInvalid option %s: %s\n\n",
+ poptBadOption(pc, 0), poptStrerror(opt));
+ poptPrintUsage(pc, stderr, 0);
+ return 1;
+ }
+ }
+
+ if (domain == NULL) {
+ fprintf(stderr, "\nMissing option, "
+ "--domain is a mandatory option.\n\n");
+ poptPrintUsage(pc, stderr, 0);
+ return 1;
+ }
+
+ if (id == 0) {
+ fprintf(stderr, "\nMissing option, "
+ "--id is a mandatory option.\n\n");
+ poptPrintUsage(pc, stderr, 0);
+ return 1;
+ }
+
+ poptFreeContext(pc);
+
+
+ /* set up things like debug , signals, daemonization, etc... */
+ debug_log_file = talloc_asprintf(NULL, "proxy_child_%s", domain);
+ if (!debug_log_file) return 2;
+
+ srv_name = talloc_asprintf(NULL, "sssd[proxy_child[%s]]", domain);
+ if (!srv_name) return 2;
+
+ conf_entry = talloc_asprintf(NULL, CONFDB_DOMAIN_PATH_TMPL, domain);
+ if (!conf_entry) return 2;
+
+ ret = server_setup(srv_name, 0, conf_entry, &main_ctx);
+ if (ret != EOK) {
+ DEBUG(0, ("Could not set up mainloop [%d]\n", ret));
+ return 2;
+ }
+
+ ret = unsetenv("_SSS_LOOPS");
+ if (ret != EOK) {
+ DEBUG(1, ("Failed to unset _SSS_LOOPS, "
+ "pam modules might not work as expected.\n"));
+ }
+
+ ret = confdb_get_string(main_ctx->confdb_ctx, main_ctx, conf_entry,
+ CONFDB_PROXY_PAM_TARGET, NULL, &pam_target);
+ if (ret != EOK) {
+ DEBUG(0, ("Error reading from confdb (%d) [%s]\n",
+ ret, strerror(ret)));
+ return 4;
+ }
+ if (pam_target == NULL) {
+ DEBUG(1, ("Missing option proxy_pam_target.\n"));
+ return 4;
+ }
+
+ ret = die_if_parent_died();
+ if (ret != EOK) {
+ /* This is not fatal, don't return */
+ DEBUG(2, ("Could not set up to exit when parent process does\n"));
+ }
+
+ ret = proxy_child_process_init(main_ctx, domain, main_ctx->event_ctx,
+ main_ctx->confdb_ctx, pam_target,
+ (uint32_t)id);
+ if (ret != EOK) {
+ DEBUG(0, ("Could not initialize proxy child [%d].\n", ret));
+ return 3;
+ }
+
+ DEBUG(1, ("Proxy child for domain [%s] started!\n", domain));
+
+ /* loop on main */
+ server_loop(main_ctx);
+
+ return 0;
+}