diff options
Diffstat (limited to 'src/providers/proxy')
| -rw-r--r-- | src/providers/proxy/proxy.c | 2502 | ||||
| -rw-r--r-- | src/providers/proxy/proxy.h | 30 | ||||
| -rw-r--r-- | src/providers/proxy/proxy_child.c | 507 |
3 files changed, 3039 insertions, 0 deletions
diff --git a/src/providers/proxy/proxy.c b/src/providers/proxy/proxy.c new file mode 100644 index 000000000..9a8dc4a26 --- /dev/null +++ b/src/providers/proxy/proxy.c @@ -0,0 +1,2502 @@ +/* + SSSD + + Proxy Module + + Copyright (C) Simo Sorce <ssorce@redhat.com> 2008-2009 + + 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 <nss.h> +#include <errno.h> +#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> + +#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, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*getpwuid_r)(uid_t uid, struct passwd *result, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*setpwent)(void); + enum nss_status (*getpwent_r)(struct passwd *result, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*endpwent)(void); + + enum nss_status (*getgrnam_r)(const char *name, struct group *result, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*getgrgid_r)(gid_t gid, struct group *result, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*setgrent)(void); + enum nss_status (*getgrent_r)(struct group *result, + char *buffer, size_t buflen, int *errnop); + enum nss_status (*endgrent)(void); + enum nss_status (*initgroups_dyn)(const char *user, gid_t group, + long int *start, long int *size, + gid_t **groups, long int limit, + int *errnop); +}; + +struct proxy_ctx { + struct be_ctx *be; + int entry_cache_timeout; + struct proxy_nss_ops ops; +}; + +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 { + uint32_t authtok_size; + uint8_t *authtok; +}; + +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) { + struct pam_data *pd; + 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); + + switch (pd->cmd) { + case SSS_PAM_AUTHENTICATE: + ctx = talloc_get_type(req->be_ctx->bet_info[BET_AUTH].pvt_bet_data, + struct proxy_auth_ctx); + break; + case SSS_PAM_CHAUTHTOK: + case SSS_PAM_CHAUTHTOK_PRELIM: + ctx = talloc_get_type(req->be_ctx->bet_info[BET_CHPASS].pvt_bet_data, + struct proxy_auth_ctx); + break; + case SSS_PAM_ACCT_MGMT: + ctx = talloc_get_type(req->be_ctx->bet_info[BET_ACCESS].pvt_bet_data, + struct proxy_auth_ctx); + break; + case SSS_PAM_SETCRED: + case SSS_PAM_OPEN_SESSION: + case SSS_PAM_CLOSE_SESSION: + pd->pam_status = PAM_SUCCESS; + proxy_reply(req, DP_ERR_OK, EOK, NULL); + return; + default: + DEBUG(1, ("Unsupported PAM task.\n")); + pd->pam_status = PAM_MODULE_UNKNOWN; + proxy_reply(req, DP_ERR_OK, EINVAL, "Unsupported PAM task"); + return; + } + + 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; + + 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; + } + } + + 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; + } + 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; + } + + /* 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)); + + errno = 0; + ret = waitpid(sig_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 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; + } + + imm = tevent_create_immediate(ev); + if (imm == NULL) { + DEBUG(1, ("tevent_create_immediate failed.\n")); + return; + } + + 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; + } + + 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); + + ctx = tevent_req_data(req, struct proxy_child_ctx); + *pd = talloc_steal(mem_ctx, ctx->pd); + + 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 */ + DEBUG(2, ("Failed to cache password\n")); + goto done; + } + talloc_set_destructor((TALLOC_CTX *)password, password_destructor); + + 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 != EOK) { + DEBUG(2, ("Failed to cache password (%d)[%s]!?\n", + ret, strerror(ret))); + } + } + +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, + int error, const char *errstr) +{ + if (!req->be_ctx->offstat.offline) { + /* This action took place online. + * Fire any online callbacks if necessary. + * Note: we're checking the offline value directly, + * because if the activity took a long time to + * complete, calling be_is_offline() might report false + * incorrectly. + */ + be_run_online_cb(req->be_ctx); + } + return req->fn(req, dp_err, error, errstr); +} + +/* =Common-proxy-tevent_req-utils=========================================*/ + +#define DEFAULT_BUFSIZE 4096 +#define MAX_BUF_SIZE 1024*1024 /* max 1MiB */ + +/* =Getpwnam-wrapper======================================================*/ + +static int delete_user(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb, + struct sss_domain_info *domain, const char *name); + +static int get_pw_name(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + const char *name) +{ + TALLOC_CTX *tmpctx; + struct passwd *pwd; + enum nss_status status; + char *buffer; + size_t buflen; + int ret; + + DEBUG(7, ("Searching user by name (%s)\n", name)); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + pwd = talloc_zero(tmpctx, struct passwd); + if (!pwd) { + ret = ENOMEM; + goto done; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + goto done; + } + + /* FIXME: should we move this call outside the transaction to keep the + * transaction as short as possible ? */ + status = ctx->ops.getpwnam_r(name, pwd, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_NOTFOUND: + + DEBUG(7, ("User %s not found.\n", name)); + ret = delete_user(tmpctx, sysdb, dom, name); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("User %s found: (%s, %d, %d)\n", + name, pwd->pw_name, pwd->pw_uid, pwd->pw_gid)); + + /* uid=0 or gid=0 are invalid values */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(pwd->pw_uid, dom->id_min, dom->id_max) || + OUT_OF_ID_RANGE(pwd->pw_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("User [%s] filtered out! (id out of range)\n", name)); + ret = delete_user(tmpctx, sysdb, dom, name); + if (ret) { + goto done; + } + break; + } + + ret = sysdb_store_user(tmpctx, sysdb, dom, + pwd->pw_name, + pwd->pw_passwd, + pwd->pw_uid, + pwd->pw_gid, + pwd->pw_gecos, + pwd->pw_dir, + pwd->pw_shell, + NULL, ctx->entry_cache_timeout); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + goto done; + + default: + ret = EIO; + goto done; + } + +done: + talloc_zfree(tmpctx); + if (ret) { + DEBUG(2, ("proxy -> getpwnam_r failed for '%s' <%d>\n", + name, status)); + } + return ret; +} + +static int delete_user(TALLOC_CTX *mem_ctx, struct sysdb_ctx *sysdb, + struct sss_domain_info *domain, const char *name) +{ + struct ldb_dn *dn; + + DEBUG(7, ("User %s does not exist (or is invalid) on remote server," + " deleting!\n", name)); + + dn = sysdb_user_dn(sysdb, mem_ctx, domain->name, name); + if (!dn) { + return ENOMEM; + } + + return sysdb_delete_entry(sysdb, dn, true); +} + +/* =Getpwuid-wrapper======================================================*/ + +static int get_pw_uid(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + uid_t uid) +{ + TALLOC_CTX *tmpctx; + struct passwd *pwd; + enum nss_status status; + char *buffer; + size_t buflen; + bool del_user = false; + int ret; + + DEBUG(7, ("Searching user by uid (%d)\n", uid)); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + pwd = talloc_zero(tmpctx, struct passwd); + if (!pwd) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getpwuid_r failed for '%d': [%d] %s\n", + uid, ret, strerror(ret))); + return ret; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getpwuid_r failed for '%d': [%d] %s\n", + uid, ret, strerror(ret))); + return ret; + } + + status = ctx->ops.getpwuid_r(uid, pwd, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_NOTFOUND: + + DEBUG(7, ("User %d not found.\n", uid)); + del_user = true; + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("User %d found (%s, %d, %d)\n", + uid, pwd->pw_name, pwd->pw_uid, pwd->pw_gid)); + + /* uid=0 or gid=0 are invalid values */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(pwd->pw_uid, dom->id_min, dom->id_max) || + OUT_OF_ID_RANGE(pwd->pw_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("User [%s] filtered out! (id out of range)\n", + pwd->pw_name)); + del_user = true; + break; + } + + ret = sysdb_store_user(tmpctx, sysdb, dom, + pwd->pw_name, + pwd->pw_passwd, + pwd->pw_uid, + pwd->pw_gid, + pwd->pw_gecos, + pwd->pw_dir, + pwd->pw_shell, + NULL, ctx->entry_cache_timeout); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + goto done; + + default: + ret = EIO; + goto done; + } + + if (del_user) { + DEBUG(7, ("User %d does not exist (or is invalid) on remote server," + " deleting!\n", uid)); + + ret = sysdb_delete_user(tmpctx, sysdb, dom, NULL, uid); + if (ret) { + goto done; + } + } + +done: + talloc_zfree(tmpctx); + if (ret) { + DEBUG(2, ("proxy -> getpwuid_r failed for '%d' <%d>\n", uid, status)); + } + return ret; +} + +/* =Getpwent-wrapper======================================================*/ + +static int enum_users(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom) +{ + TALLOC_CTX *tmpctx; + bool in_transaction = false; + struct passwd *pwd; + enum nss_status status; + size_t buflen; + char *buffer; + char *newbuf; + int ret; + + DEBUG(7, ("Enumerating users\n")); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + pwd = talloc_zero(tmpctx, struct passwd); + if (!pwd) { + ret = ENOMEM; + goto done; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + goto done; + } + + ret = sysdb_transaction_start(sysdb); + if (ret) { + goto done; + } + in_transaction = true; + + status = ctx->ops.setpwent(); + if (status != NSS_STATUS_SUCCESS) { + ret = EIO; + goto done; + } + +again: + /* always zero out the pwd structure */ + memset(pwd, 0, sizeof(struct passwd)); + + /* get entry */ + status = ctx->ops.getpwent_r(pwd, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_TRYAGAIN: + /* buffer too small ? */ + if (buflen < MAX_BUF_SIZE) { + buflen *= 2; + } + if (buflen > MAX_BUF_SIZE) { + buflen = MAX_BUF_SIZE; + } + newbuf = talloc_realloc_size(tmpctx, buffer, buflen); + if (!newbuf) { + ret = ENOMEM; + goto done; + } + buffer = newbuf; + goto again; + + case NSS_STATUS_NOTFOUND: + + /* we are done here */ + DEBUG(7, ("Enumeration completed.\n")); + + ret = sysdb_transaction_commit(sysdb); + in_transaction = false; + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("User found (%s, %d, %d)\n", + pwd->pw_name, pwd->pw_uid, pwd->pw_gid)); + + /* uid=0 or gid=0 are invalid values */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(pwd->pw_uid, dom->id_min, dom->id_max) || + OUT_OF_ID_RANGE(pwd->pw_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("User [%s] filtered out! (id out of range)\n", + pwd->pw_name)); + + goto again; /* skip */ + } + + ret = sysdb_store_user(tmpctx, sysdb, dom, + pwd->pw_name, + pwd->pw_passwd, + pwd->pw_uid, + pwd->pw_gid, + pwd->pw_gecos, + pwd->pw_dir, + pwd->pw_shell, + NULL, ctx->entry_cache_timeout); + if (ret) { + /* Do not fail completely on errors. + * Just report the failure to save and go on */ + DEBUG(2, ("Failed to store user %s. Ignoring.\n", + pwd->pw_name)); + } + goto again; /* next */ + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + break; + + default: + DEBUG(2, ("proxy -> getpwent_r failed (%d)[%s]\n", + ret, strerror(ret))); + break; + } + +done: + talloc_zfree(tmpctx); + if (in_transaction) { + sysdb_transaction_cancel(sysdb); + } + ctx->ops.endpwent(); + return ret; +} + +/* =Getgrnam-wrapper======================================================*/ + +#define DEBUG_GR_MEM(level, grp) \ + do { \ + if (debug_level >= level) { \ + if (!grp->gr_mem || !grp->gr_mem[0]) { \ + DEBUG(level, ("Group %s has no members!\n", \ + grp->gr_name)); \ + } else { \ + int i = 0; \ + while (grp->gr_mem[i]) { \ + /* count */ \ + i++; \ + } \ + DEBUG(level, ("Group %s has %d members!\n", \ + grp->gr_name, i)); \ + } \ + } \ + } while(0) + +static int get_gr_name(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + const char *name) +{ + TALLOC_CTX *tmpctx; + struct group *grp; + enum nss_status status; + char *buffer; + char *newbuf; + size_t buflen; + bool delete_group = false; + struct sysdb_attrs *members; + int ret; + + DEBUG(7, ("Searching group by name (%s)\n", name)); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + grp = talloc(tmpctx, struct group); + if (!grp) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getgrnam_r failed for '%s': [%d] %s\n", + name, ret, strerror(ret))); + return ret; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getgrnam_r failed for '%s': [%d] %s\n", + name, ret, strerror(ret))); + return ret; + } + + /* FIXME: should we move this call outside the transaction to keep the + * transaction as short as possible ? */ +again: + /* always zero out the grp structure */ + memset(grp, 0, sizeof(struct group)); + + status = ctx->ops.getgrnam_r(name, grp, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_TRYAGAIN: + /* buffer too small ? */ + if (buflen < MAX_BUF_SIZE) { + buflen *= 2; + } + if (buflen > MAX_BUF_SIZE) { + buflen = MAX_BUF_SIZE; + } + newbuf = talloc_realloc_size(tmpctx, buffer, buflen); + if (!newbuf) { + ret = ENOMEM; + goto done; + } + buffer = newbuf; + goto again; + + case NSS_STATUS_NOTFOUND: + + DEBUG(7, ("Group %s not found.\n", name)); + delete_group = true; + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("Group %s found: (%s, %d)\n", + name, grp->gr_name, grp->gr_gid)); + + /* gid=0 is an invalid value */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(grp->gr_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("Group [%s] filtered out! (id out of range)\n", + name)); + delete_group = true; + break; + } + + DEBUG_GR_MEM(7, grp); + + if (grp->gr_mem && grp->gr_mem[0]) { + members = sysdb_new_attrs(tmpctx); + if (!members) { + ret = ENOMEM; + goto done; + } + ret = sysdb_attrs_users_from_str_list(members, SYSDB_MEMBER, + dom->name, + (const char **)grp->gr_mem); + if (ret) { + goto done; + } + } else { + members = NULL; + } + + ret = sysdb_store_group(tmpctx, sysdb, dom, + grp->gr_name, + grp->gr_gid, + members, + ctx->entry_cache_timeout); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + goto done; + + default: + goto done; + } + + if (delete_group) { + struct ldb_dn *dn; + + DEBUG(7, ("Group %s does not exist (or is invalid) on remote server," + " deleting!\n", name)); + + dn = sysdb_group_dn(sysdb, tmpctx, dom->name, name); + if (!dn) { + ret = ENOMEM; + goto done; + } + + ret = sysdb_delete_entry(sysdb, dn, true); + if (ret) { + goto done; + } + } + +done: + talloc_zfree(tmpctx); + if (ret) { + DEBUG(2, ("proxy -> getgrnam_r failed for '%s' <%d>\n", + name, status)); + } + return ret; +} + +/* =Getgrgid-wrapper======================================================*/ + +static int get_gr_gid(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + gid_t gid) +{ + TALLOC_CTX *tmpctx; + struct group *grp; + enum nss_status status; + char *buffer; + char *newbuf; + size_t buflen; + bool delete_group = false; + struct sysdb_attrs *members; + int ret; + + DEBUG(7, ("Searching group by gid (%d)\n", gid)); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + grp = talloc(tmpctx, struct group); + if (!grp) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getgrgid_r failed for '%d': [%d] %s\n", + gid, ret, strerror(ret))); + return ret; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + DEBUG(1, ("proxy -> getgrgid_r failed for '%d': [%d] %s\n", + gid, ret, strerror(ret))); + return ret; + } + +again: + /* always zero out the group structure */ + memset(grp, 0, sizeof(struct group)); + + status = ctx->ops.getgrgid_r(gid, grp, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_TRYAGAIN: + /* buffer too small ? */ + if (buflen < MAX_BUF_SIZE) { + buflen *= 2; + } + if (buflen > MAX_BUF_SIZE) { + buflen = MAX_BUF_SIZE; + } + newbuf = talloc_realloc_size(tmpctx, buffer, buflen); + if (!newbuf) { + ret = ENOMEM; + goto done; + } + buffer = newbuf; + goto again; + + case NSS_STATUS_NOTFOUND: + + DEBUG(7, ("Group %d not found.\n", gid)); + delete_group = true; + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("Group %d found (%s, %d)\n", + gid, grp->gr_name, grp->gr_gid)); + + /* gid=0 is an invalid value */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(grp->gr_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("Group [%s] filtered out! (id out of range)\n", + grp->gr_name)); + delete_group = true; + break; + } + + DEBUG_GR_MEM(7, grp); + + if (grp->gr_mem && grp->gr_mem[0]) { + members = sysdb_new_attrs(tmpctx); + if (!members) { + ret = ENOMEM; + goto done; + } + ret = sysdb_attrs_users_from_str_list(members, SYSDB_MEMBER, + dom->name, + (const char **)grp->gr_mem); + if (ret) { + goto done; + } + } else { + members = NULL; + } + + ret = sysdb_store_group(tmpctx, sysdb, dom, + grp->gr_name, + grp->gr_gid, + members, + ctx->entry_cache_timeout); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + goto done; + + default: + ret = EIO; + goto done; + } + + if (delete_group) { + + DEBUG(7, ("Group %d does not exist (or is invalid) on remote server," + " deleting!\n", gid)); + + ret = sysdb_delete_group(tmpctx, sysdb, dom, NULL, gid); + if (ret) { + goto done; + } + } + +done: + talloc_zfree(tmpctx); + if (ret) { + DEBUG(2, ("proxy -> getgrgid_r failed for '%d' <%d>\n", + gid, status)); + } + return ret; +} + +/* =Getgrent-wrapper======================================================*/ + +static int enum_groups(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom) +{ + TALLOC_CTX *tmpctx; + bool in_transaction = false; + struct group *grp; + enum nss_status status; + size_t buflen; + char *buffer; + struct sysdb_attrs *members; + char *newbuf; + int ret; + + DEBUG(7, ("Enumerating groups\n")); + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + grp = talloc(tmpctx, struct group); + if (!grp) { + ret = ENOMEM; + goto done; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + goto done; + } + + ret = sysdb_transaction_start(sysdb); + if (ret) { + goto done; + } + in_transaction = true; + + status = ctx->ops.setgrent(); + if (status != NSS_STATUS_SUCCESS) { + ret = EIO; + goto done; + } + +again: + /* always zero out the grp structure */ + memset(grp, 0, sizeof(struct group)); + + /* get entry */ + status = ctx->ops.getgrent_r(grp, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_TRYAGAIN: + /* buffer too small ? */ + if (buflen < MAX_BUF_SIZE) { + buflen *= 2; + } + if (buflen > MAX_BUF_SIZE) { + buflen = MAX_BUF_SIZE; + } + newbuf = talloc_realloc_size(tmpctx, buffer, buflen); + if (!newbuf) { + ret = ENOMEM; + goto done; + } + buffer = newbuf; + goto again; + + case NSS_STATUS_NOTFOUND: + + /* we are done here */ + DEBUG(7, ("Enumeration completed.\n")); + + ret = sysdb_transaction_commit(sysdb); + in_transaction = false; + break; + + case NSS_STATUS_SUCCESS: + + DEBUG(7, ("Group found (%s, %d)\n", + grp->gr_name, grp->gr_gid)); + + /* gid=0 is an invalid value */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(grp->gr_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("Group [%s] filtered out! (id out of range)\n", + grp->gr_name)); + + goto again; /* skip */ + } + + DEBUG_GR_MEM(7, grp); + + if (grp->gr_mem && grp->gr_mem[0]) { + members = sysdb_new_attrs(tmpctx); + if (!members) { + ret = ENOMEM; + goto done; + } + ret = sysdb_attrs_users_from_str_list(members, SYSDB_MEMBER, + dom->name, + (const char **)grp->gr_mem); + if (ret) { + goto done; + } + } else { + members = NULL; + } + + ret = sysdb_store_group(tmpctx, sysdb, dom, + grp->gr_name, + grp->gr_gid, + members, + ctx->entry_cache_timeout); + if (ret) { + /* Do not fail completely on errors. + * Just report the failure to save and go on */ + DEBUG(2, ("Failed to store group. Ignoring.\n")); + } + goto again; /* next */ + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + break; + + default: + DEBUG(2, ("proxy -> getgrent_r failed (%d)[%s]\n", + ret, strerror(ret))); + break; + } + +done: + talloc_zfree(tmpctx); + if (in_transaction) { + sysdb_transaction_cancel(sysdb); + } + ctx->ops.endgrent(); + return ret; +} + + +/* =Initgroups-wrapper====================================================*/ + +static int get_initgr_groups_process(TALLOC_CTX *memctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + struct passwd *pwd); + +static int get_initgr(TALLOC_CTX *mem_ctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + const char *name) +{ + TALLOC_CTX *tmpctx; + bool in_transaction = false; + struct passwd *pwd; + enum nss_status status; + char *buffer; + size_t buflen; + int ret; + + tmpctx = talloc_new(mem_ctx); + if (!tmpctx) { + return ENOMEM; + } + + pwd = talloc_zero(tmpctx, struct passwd); + if (!pwd) { + ret = ENOMEM; + goto done; + } + + buflen = DEFAULT_BUFSIZE; + buffer = talloc_size(tmpctx, buflen); + if (!buffer) { + ret = ENOMEM; + goto done; + } + + ret = sysdb_transaction_start(sysdb); + if (ret) { + goto done; + } + in_transaction = true; + + /* FIXME: should we move this call outside the transaction to keep the + * transaction as short as possible ? */ + status = ctx->ops.getpwnam_r(name, pwd, buffer, buflen, &ret); + + switch (status) { + case NSS_STATUS_NOTFOUND: + + DEBUG(7, ("User %s not found.\n", name)); + ret = delete_user(tmpctx, sysdb, dom, name); + if (ret) { + goto done; + } + break; + + case NSS_STATUS_SUCCESS: + + /* uid=0 or gid=0 are invalid values */ + /* also check that the id is in the valid range for this domain */ + if (OUT_OF_ID_RANGE(pwd->pw_uid, dom->id_min, dom->id_max) || + OUT_OF_ID_RANGE(pwd->pw_gid, dom->id_min, dom->id_max)) { + + DEBUG(2, ("User [%s] filtered out! (id out of range)\n", + name)); + ret = delete_user(tmpctx, sysdb, dom, name); + break; + } + + ret = sysdb_store_user(tmpctx, sysdb, dom, + pwd->pw_name, + pwd->pw_passwd, + pwd->pw_uid, + pwd->pw_gid, + pwd->pw_gecos, + pwd->pw_dir, + pwd->pw_shell, + NULL, ctx->entry_cache_timeout); + if (ret) { + goto done; + } + + ret = get_initgr_groups_process(tmpctx, ctx, sysdb, dom, pwd); + if (ret == EOK) { + ret = sysdb_transaction_commit(sysdb); + in_transaction = true; + } + break; + + case NSS_STATUS_UNAVAIL: + /* "remote" backend unavailable. Enter offline mode */ + ret = ENXIO; + break; + + default: + DEBUG(2, ("proxy -> getpwnam_r failed for '%s' <%d>\n", + name, status)); + ret = EIO; + break; + } + +done: + talloc_zfree(tmpctx); + if (in_transaction) { + sysdb_transaction_cancel(sysdb); + } + return ret; +} + +static int get_initgr_groups_process(TALLOC_CTX *memctx, + struct proxy_ctx *ctx, + struct sysdb_ctx *sysdb, + struct sss_domain_info *dom, + struct passwd *pwd) +{ + enum nss_status status; + long int limit; + long int size; + long int num; + long int num_gids; + gid_t *gids; + int ret; + int i; + + num_gids = 0; + limit = 4096; + num = 4096; + size = num*sizeof(gid_t); + gids = talloc_size(memctx, size); + if (!gids) { + return ENOMEM; + } + +again: + /* FIXME: should we move this call outside the transaction to keep the + * transaction as short as possible ? */ + status = ctx->ops.initgroups_dyn(pwd->pw_name, pwd->pw_gid, &num_gids, + &num, &gids, limit, &ret); + switch (status) { + case NSS_STATUS_TRYAGAIN: + /* buffer too small ? */ + if (size < MAX_BUF_SIZE) { + num *= 2; + size = num*sizeof(gid_t); + } + if (size > MAX_BUF_SIZE) { + size = MAX_BUF_SIZE; + num = size/sizeof(gid_t); + } + limit = num; + gids = talloc_realloc_size(memctx, gids, size); + if (!gids) { + return ENOMEM; + } + goto again; /* retry with more memory */ + + case NSS_STATUS_SUCCESS: + DEBUG(4, ("User [%s] appears to be member of %lu groups\n", + pwd->pw_name, num_gids)); + + for (i = 0; i < num_gids; i++) { + ret = get_gr_gid(memctx, ctx, sysdb, dom, gids[i]); + if (ret) { + return ret; + } + } + break; + + default: + DEBUG(2, ("proxy -> initgroups_dyn failed (%d)[%s]\n", + ret, strerror(ret))); + ret = EIO; + break; + } + + return ret; +} + +/* =Proxy_Id-Functions====================================================*/ + +static void proxy_get_account_info(struct be_req *breq) +{ + struct be_acct_req *ar; + struct proxy_ctx *ctx; + struct tevent_context *ev; + struct sysdb_ctx *sysdb; + struct sss_domain_info *domain; + uid_t uid; + gid_t gid; + int ret; + + ar = talloc_get_type(breq->req_data, struct be_acct_req); + ctx = talloc_get_type(breq->be_ctx->bet_info[BET_ID].pvt_bet_data, struct proxy_ctx); + ev = breq->be_ctx->ev; + sysdb = breq->be_ctx->sysdb; + domain = breq->be_ctx->domain; + + if (be_is_offline(breq->be_ctx)) { + return proxy_reply(breq, DP_ERR_OFFLINE, EAGAIN, "Offline"); + } + + /* for now we support only core attrs */ + if (ar->attr_type != BE_ATTR_CORE) { + return proxy_reply(breq, DP_ERR_FATAL, EINVAL, "Invalid attr type"); + } + + switch (ar->entry_type & 0xFFF) { + case BE_REQ_USER: /* user */ + switch (ar->filter_type) { + case BE_FILTER_NAME: + if (strchr(ar->filter_value, '*')) { + ret = enum_users(breq, ctx, sysdb, domain); + } else { + ret = get_pw_name(breq, ctx, sysdb, domain, ar->filter_value); + } + break; + + case BE_FILTER_IDNUM: + if (strchr(ar->filter_value, '*')) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid attr type"); + } else { + char *endptr; + errno = 0; + uid = (uid_t)strtol(ar->filter_value, &endptr, 0); + if (errno || *endptr || (ar->filter_value == endptr)) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid attr type"); + } + ret = get_pw_uid(breq, ctx, sysdb, domain, uid); + } + break; + default: + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid filter type"); + } + break; + + case BE_REQ_GROUP: /* group */ + switch (ar->filter_type) { + case BE_FILTER_NAME: + if (strchr(ar->filter_value, '*')) { + ret = enum_groups(breq, ctx, sysdb, domain); + } else { + ret = get_gr_name(breq, ctx, sysdb, domain, ar->filter_value); + } + break; + case BE_FILTER_IDNUM: + if (strchr(ar->filter_value, '*')) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid attr type"); + } else { + char *endptr; + errno = 0; + gid = (gid_t)strtol(ar->filter_value, &endptr, 0); + if (errno || *endptr || (ar->filter_value == endptr)) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid attr type"); + } + ret = get_gr_gid(breq, ctx, sysdb, domain, gid); + } + break; + default: + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid filter type"); + } + break; + + case BE_REQ_INITGROUPS: /* init groups for user */ + if (ar->filter_type != BE_FILTER_NAME) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid filter type"); + } + if (strchr(ar->filter_value, '*')) { + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid filter value"); + } + if (ctx->ops.initgroups_dyn == NULL) { + return proxy_reply(breq, DP_ERR_FATAL, + ENODEV, "Initgroups call not supported"); + } + ret = get_initgr(breq, ctx, sysdb, domain, ar->filter_value); + break; + + default: /*fail*/ + return proxy_reply(breq, DP_ERR_FATAL, + EINVAL, "Invalid request type"); + } + + if (ret) { + if (ret == ENXIO) { + DEBUG(2, ("proxy returned UNAVAIL error, going offline!\n")); + be_mark_offline(breq->be_ctx); + } + proxy_reply(breq, DP_ERR_FATAL, ret, NULL); + return; + } + proxy_reply(breq, DP_ERR_OK, EOK, NULL); +} + +static void proxy_shutdown(struct be_req *req) +{ + /* TODO: Clean up any internal data */ + req->fn(req, DP_ERR_OK, EOK, NULL); +} + +static void proxy_auth_shutdown(struct be_req *req) +{ + talloc_free(req->be_ctx->bet_info[BET_AUTH].pvt_bet_data); + req->fn(req, DP_ERR_OK, EOK, NULL); +} + +struct bet_ops proxy_id_ops = { + .handler = proxy_get_account_info, + .finalize = proxy_shutdown +}; + +struct bet_ops proxy_auth_ops = { + .handler = proxy_pam_handler, + .finalize = proxy_auth_shutdown +}; + +struct bet_ops proxy_access_ops = { + .handler = proxy_pam_handler, + .finalize = proxy_auth_shutdown +}; + +struct bet_ops proxy_chpass_ops = { + .handler = proxy_pam_handler, + .finalize = proxy_auth_shutdown +}; + +static void *proxy_dlsym(void *handle, const char *functemp, char *libname) +{ + char *funcname; + void *funcptr; + + funcname = talloc_asprintf(NULL, functemp, libname); + if (funcname == NULL) return NULL; + + funcptr = dlsym(handle, funcname); + talloc_free(funcname); + + return funcptr; +} + +int sssm_proxy_id_init(struct be_ctx *bectx, + struct bet_ops **ops, void **pvt_data) +{ + struct proxy_ctx *ctx; + char *libname; + char *libpath; + void *handle; + int ret; + + ctx = talloc_zero(bectx, struct proxy_ctx); + if (!ctx) { + return ENOMEM; + } + ctx->be = bectx; + + ret = confdb_get_int(bectx->cdb, ctx, bectx->conf_path, + CONFDB_DOMAIN_ENTRY_CACHE_TIMEOUT, 600, + &ctx->entry_cache_timeout); + if (ret != EOK) goto done; + + ret = confdb_get_string(bectx->cdb, ctx, bectx->conf_path, + CONFDB_PROXY_LIBNAME, NULL, &libname); + if (ret != EOK) goto done; + if (libname == NULL) { + ret = ENOENT; + goto done; + } + + libpath = talloc_asprintf(ctx, "libnss_%s.so.2", libname); + if (!libpath) { + ret = ENOMEM; + goto done; + } + + handle = dlopen(libpath, RTLD_NOW); + if (!handle) { + DEBUG(0, ("Unable to load %s module with path, error: %s\n", + libpath, dlerror())); + ret = ELIBACC; + goto done; + } + + ctx->ops.getpwnam_r = proxy_dlsym(handle, "_nss_%s_getpwnam_r", libname); + if (!ctx->ops.getpwnam_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.getpwuid_r = proxy_dlsym(handle, "_nss_%s_getpwuid_r", libname); + if (!ctx->ops.getpwuid_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.setpwent = proxy_dlsym(handle, "_nss_%s_setpwent", libname); + if (!ctx->ops.setpwent) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.getpwent_r = proxy_dlsym(handle, "_nss_%s_getpwent_r", libname); + if (!ctx->ops.getpwent_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.endpwent = proxy_dlsym(handle, "_nss_%s_endpwent", libname); + if (!ctx->ops.endpwent) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.getgrnam_r = proxy_dlsym(handle, "_nss_%s_getgrnam_r", libname); + if (!ctx->ops.getgrnam_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.getgrgid_r = proxy_dlsym(handle, "_nss_%s_getgrgid_r", libname); + if (!ctx->ops.getgrgid_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.setgrent = proxy_dlsym(handle, "_nss_%s_setgrent", libname); + if (!ctx->ops.setgrent) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.getgrent_r = proxy_dlsym(handle, "_nss_%s_getgrent_r", libname); + if (!ctx->ops.getgrent_r) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.endgrent = proxy_dlsym(handle, "_nss_%s_endgrent", libname); + if (!ctx->ops.endgrent) { + DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror())); + ret = ELIBBAD; + goto done; + } + + ctx->ops.initgroups_dyn = proxy_dlsym(handle, "_nss_%s_initgroups_dyn", + libname); + if (!ctx->ops.initgroups_dyn) { + DEBUG(1, ("The '%s' library does not provides the " + "_nss_XXX_initgroups_dyn function!\n" + "initgroups will be slow as it will require " + "full groups enumeration!\n", libname)); + } + + *ops = &proxy_id_ops; + *pvt_data = ctx; + ret = EOK; + +done: + if (ret != EOK) { + talloc_free(ctx); + } + 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; + + /* 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, + &ctx->pam_target); + if (ret != EOK) goto done; + if (!ctx->pam_target) { + DEBUG(1, ("Missing option proxy_pam_target.\n")); + ret = EINVAL; + 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; + +done: + if (ret != EOK) { + talloc_free(ctx); + } + return ret; +} + +int sssm_proxy_access_init(struct be_ctx *bectx, + struct bet_ops **ops, void **pvt_data) +{ + int ret; + ret = sssm_proxy_auth_init(bectx, ops, pvt_data); + *ops = &proxy_access_ops; + return ret; +} + +int sssm_proxy_chpass_init(struct be_ctx *bectx, + struct bet_ops **ops, void **pvt_data) +{ + int ret; + ret = sssm_proxy_auth_init(bectx, ops, pvt_data); + *ops = &proxy_chpass_ops; + return ret; +} diff --git a/src/providers/proxy/proxy.h b/src/providers/proxy/proxy.h new file mode 100644 index 000000000..d95e50efe --- /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 000000000..c8f1eeb50 --- /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; +} |