Add PAM responder

Also move responders under server/responder with shared code
in server/responder/common

Signed-off-by: Simo Sorce <ssorce@redhat.com>

1 files changed, 590 insertions, 0 deletions

diff --git a/server/responder/nss/nsssrv.c b/server/responder/nss/nsssrv.c
new file mode 100644
index 00000000..93490c46
--- /dev/null
+++ b/server/responder/nss/nsssrv.c
@@ -0,0 +1,590 @@
+/*
+   SSSD
+
+   NSS Responder
+
+   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008
+
+   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 "popt.h"
+#include "util/util.h"
+#include "responder/nss/nsssrv.h"
+#include "db/sysdb.h"
+#include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "util/btreemap.h"
+#include "responder/common/responder_packet.h"
+#include "providers/data_provider.h"
+#include "monitor/monitor_sbus.h"
+#include "monitor/monitor_interfaces.h"
+#include "sbus/sbus_client.h"
+
+#define SSS_NSS_PIPE_NAME "nss"
+
+static int service_identity(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int service_pong(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int service_reload(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int nss_init_domains(struct nss_ctx *nctx);
+static int _domain_comparator(const void *key1, const void *key2);
+
+struct sbus_method nss_sbus_methods[] = {
+    {SERVICE_METHOD_IDENTITY, service_identity},
+    {SERVICE_METHOD_PING, service_pong},
+    {SERVICE_METHOD_RELOAD, service_reload},
+    {NULL, NULL}
+};
+
+static void set_nonblocking(int fd)
+{
+    unsigned v;
+    v = fcntl(fd, F_GETFL, 0);
+    fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+static void set_close_on_exec(int fd)
+{
+    unsigned v;
+    v = fcntl(fd, F_GETFD, 0);
+    fcntl(fd, F_SETFD, v | FD_CLOEXEC);
+}
+
+static int client_destructor(struct cli_ctx *ctx)
+{
+    if (ctx->cfd > 0) close(ctx->cfd);
+    return 0;
+}
+
+static void client_send(struct event_context *ev, struct cli_ctx *cctx)
+{
+    int ret;
+
+    ret = sss_packet_send(cctx->creq->out, cctx->cfd);
+    if (ret == EAGAIN) {
+        /* not all data was sent, loop again */
+        return;
+    }
+    if (ret != EOK) {
+        DEBUG(0, ("Failed to read request, aborting client!\n"));
+        talloc_free(cctx);
+        return;
+    }
+
+    /* ok all sent */
+    EVENT_FD_NOT_WRITEABLE(cctx->cfde);
+    EVENT_FD_READABLE(cctx->cfde);
+    talloc_free(cctx->creq);
+    cctx->creq = NULL;
+    return;
+}
+
+static void client_recv(struct event_context *ev, struct cli_ctx *cctx)
+{
+    int ret;
+
+    if (!cctx->creq) {
+        cctx->creq = talloc_zero(cctx, struct cli_request);
+        if (!cctx->creq) {
+            DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+            talloc_free(cctx);
+            return;
+        }
+    }
+
+    if (!cctx->creq->in) {
+        ret = sss_packet_new(cctx->creq, NSS_PACKET_MAX_RECV_SIZE,
+                             0, &cctx->creq->in);
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+            talloc_free(cctx);
+            return;
+        }
+    }
+
+    ret = sss_packet_recv(cctx->creq->in, cctx->cfd);
+    switch (ret) {
+    case EOK:
+        /* do not read anymore */
+        EVENT_FD_NOT_READABLE(cctx->cfde);
+        /* execute command */
+        ret = nss_cmd_execute(cctx);
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to execute request, aborting client!\n"));
+            talloc_free(cctx);
+        }
+        /* past this point cctx can be freed at any time by callbacks
+         * in case of error, do not use it */
+        return;
+
+    case EAGAIN:
+        /* need to read still some data, loop again */
+        break;
+
+    case EINVAL:
+        DEBUG(6, ("Invalid data from client, closing connection!\n"));
+        talloc_free(cctx);
+        break;
+
+    case ENODATA:
+        DEBUG(5, ("Client disconnected!\n"));
+        talloc_free(cctx);
+        break;
+
+    default:
+        DEBUG(6, ("Failed to read request, aborting client!\n"));
+        talloc_free(cctx);
+    }
+
+    return;
+}
+
+static void client_fd_handler(struct event_context *ev,
+                              struct fd_event *fde,
+                              uint16_t flags, void *ptr)
+{
+    struct cli_ctx *cctx = talloc_get_type(ptr, struct cli_ctx);
+
+    if (flags & EVENT_FD_READ) {
+        client_recv(ev, cctx);
+        return;
+    }
+    if (flags & EVENT_FD_WRITE) {
+        client_send(ev, cctx);
+        return;
+    }
+}
+
+static void accept_fd_handler(struct event_context *ev,
+                              struct fd_event *fde,
+                              uint16_t flags, void *ptr)
+{
+    /* accept and attach new event handler */
+    struct nss_ctx *nctx = talloc_get_type(ptr, struct nss_ctx);
+    struct cli_ctx *cctx;
+    socklen_t len;
+
+    cctx = talloc_zero(nctx, struct cli_ctx);
+    if (!cctx) {
+        struct sockaddr_un addr;
+        int fd;
+        DEBUG(0, ("Out of memory trying to setup client context!\n"));
+        /* accept and close to signal the client we have a problem */
+        memset(&addr, 0, sizeof(addr));
+        len = sizeof(addr);
+        fd = accept(nctx->lfd, (struct sockaddr *)&addr, &len);
+        if (fd == -1) {
+            return;
+        }
+        close(fd);
+        return;
+    }
+
+    len = sizeof(cctx->addr);
+    cctx->cfd = accept(nctx->lfd, (struct sockaddr *)&cctx->addr, &len);
+    if (cctx->cfd == -1) {
+        DEBUG(1, ("Accept failed [%s]", strerror(errno)));
+        talloc_free(cctx);
+        return;
+    }
+
+    cctx->cfde = event_add_fd(ev, cctx, cctx->cfd,
+                              EVENT_FD_READ, client_fd_handler, cctx);
+    if (!cctx->cfde) {
+        close(cctx->cfd);
+        talloc_free(cctx);
+        DEBUG(2, ("Failed to queue client handler\n"));
+    }
+
+    cctx->ev = ev;
+    cctx->nctx = nctx;
+
+    talloc_set_destructor(cctx, client_destructor);
+
+    DEBUG(4, ("Client connected!\n"));
+
+    return;
+}
+
+static int service_identity(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+    dbus_uint16_t version = NSS_SBUS_SERVICE_VERSION;
+    const char *name = NSS_SBUS_SERVICE_NAME;
+    DBusMessage *reply;
+    dbus_bool_t ret;
+
+    DEBUG(4,("Sending ID reply: (%s,%d)\n",
+             name, version));
+
+    reply = dbus_message_new_method_return(message);
+    if (!reply) return ENOMEM;
+
+    ret = dbus_message_append_args(reply,
+                                   DBUS_TYPE_STRING, &name,
+                                   DBUS_TYPE_UINT16, &version,
+                                   DBUS_TYPE_INVALID);
+    if (!ret) {
+        dbus_message_unref(reply);
+        return EIO;
+    }
+
+    /* send reply back */
+    sbus_conn_send_reply(sconn, reply);
+    dbus_message_unref(reply);
+
+    return EOK;
+}
+
+static int service_pong(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+    DBusMessage *reply;
+    dbus_bool_t ret;
+
+    reply = dbus_message_new_method_return(message);
+    if (!reply) return ENOMEM;
+
+    ret = dbus_message_append_args(reply, DBUS_TYPE_INVALID);
+    if (!ret) {
+        dbus_message_unref(reply);
+        return EIO;
+    }
+
+    /* send reply back */
+    sbus_conn_send_reply(sconn, reply);
+    dbus_message_unref(reply);
+
+    return EOK;
+}
+
+static int service_reload(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+    /* Monitor calls this function when we need to reload
+     * our configuration information. Perform whatever steps
+     * are needed to update the configuration objects.
+     */
+
+    /* Send an empty reply to acknowledge receipt */
+    return service_pong(message, sconn);
+}
+
+static int nss_sbus_init(struct nss_ctx *nctx)
+{
+    int ret;
+    char *sbus_address;
+    struct service_sbus_ctx *ss_ctx;
+    struct sbus_method_ctx *sm_ctx;
+
+    /* Set up SBUS connection to the monitor */
+    ret = monitor_get_sbus_address(nctx, nctx->cdb, &sbus_address);
+    if (ret != EOK) {
+        DEBUG(0, ("Could not locate monitor address.\n"));
+        return ret;
+    }
+
+    ret = monitor_init_sbus_methods(nctx, nss_sbus_methods, &sm_ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("Could not initialize SBUS methods.\n"));
+        return ret;
+    }
+
+    ret = sbus_client_init(nctx, nctx->ev,
+                           sbus_address, sm_ctx,
+                           NULL /* Private Data */,
+                           NULL /* Destructor */,
+                           &ss_ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("Failed to connect to monitor services.\n"));
+        return ret;
+    }
+
+    /* Set up NSS-specific listeners */
+    /* None currently used */
+
+    nctx->ss_ctx = ss_ctx;
+
+    return EOK;
+}
+
+/* create a unix socket and listen to it */
+static int set_unix_socket(struct nss_ctx *nctx)
+{
+    struct sockaddr_un addr;
+    char *default_pipe;
+    int ret;
+
+    default_pipe = talloc_asprintf(nctx, "%s/%s", PIPE_PATH, SSS_NSS_PIPE_NAME);
+    if (!default_pipe) {
+        return ENOMEM;
+    }
+
+    ret = confdb_get_string(nctx->cdb, nctx,
+                            "config/services/nss", "unixSocket",
+                            default_pipe, &nctx->sock_name);
+    if (ret != EOK) {
+        talloc_free(default_pipe);
+        return ret;
+    }
+    talloc_free(default_pipe);
+
+    nctx->lfd = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (nctx->lfd == -1) {
+        return EIO;
+    }
+
+    /* Set the umask so that permissions are set right on the socket.
+     * It must be readable and writable by anybody on the system. */
+    umask(0111);
+
+    set_nonblocking(nctx->lfd);
+    set_close_on_exec(nctx->lfd);
+
+    memset(&addr, 0, sizeof(addr));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, nctx->sock_name, sizeof(addr.sun_path));
+
+    /* make sure we have no old sockets around */
+    unlink(nctx->sock_name);
+
+    if (bind(nctx->lfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+        DEBUG(0,("Unable to bind on socket '%s'\n", nctx->sock_name));
+        goto failed;
+    }
+    if (listen(nctx->lfd, 10) != 0) {
+        DEBUG(0,("Unable to listen on socket '%s'\n", nctx->sock_name));
+        goto failed;
+    }
+
+    nctx->lfde = event_add_fd(nctx->ev, nctx, nctx->lfd,
+                              EVENT_FD_READ, accept_fd_handler, nctx);
+
+    /* we want default permissions on created files to be very strict,
+       so set our umask to 0177 */
+    umask(0177);
+    return EOK;
+
+failed:
+    /* we want default permissions on created files to be very strict,
+       so set our umask to 0177 */
+    umask(0177);
+    close(nctx->lfd);
+    return EIO;
+}
+
+/* domain names are case insensitive for now
+ * NOTE: this function is not utf-8 safe,
+ * only ASCII names for now */
+static int _domain_comparator(const void *key1, const void *key2)
+{
+    return strcasecmp((const char *)key1, (const char *)key2);
+}
+
+static int nss_init_domains(struct nss_ctx *nctx)
+{
+    char *path;
+    char **domains;
+    char *provider;
+    TALLOC_CTX *tmp_ctx;
+    struct nss_domain_info *info;
+    int ret, i, c;
+    int retval;
+
+    tmp_ctx = talloc_new(nctx);
+    ret = confdb_get_domains(nctx->cdb, tmp_ctx, &domains);
+    if (ret != EOK) {
+        retval = ret;
+        goto done;
+    }
+
+    i = 0;
+    c = 0;
+    while (domains[i] != NULL) {
+        DEBUG(3, ("Adding domain %s to the map\n", domains[i]));
+
+        path = talloc_asprintf(tmp_ctx, "config/domains/%s", domains[i]);
+        if (!path) {
+            retval = ENOMEM;
+            goto done;
+        }
+
+        /* alloc on tmp_ctx, it will be stolen by btreemap_set_value */
+        info = talloc_zero(tmp_ctx, struct nss_domain_info);
+        if (!info) {
+            retval = ENOMEM;
+            goto done;
+        }
+
+        /* Build the basedn for this domain */
+        info->basedn = talloc_asprintf(info, SYSDB_DOM_BASE, domains[i]);
+        DEBUG(3, ("BaseDN: %s\n", info->basedn));
+
+        ret = confdb_get_int(nctx->cdb, tmp_ctx, path,
+                             "enumerate", false, &(info->enumerate));
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to fetch enumerate for [%s]!\n", domains[i]));
+        }
+
+        ret = confdb_get_bool(nctx->cdb, tmp_ctx, path,
+                              "legacy", false, &(info->legacy));
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to fetch legacy for [%s]!\n", domains[i]));
+        }
+
+        ret = confdb_get_string(nctx->cdb, tmp_ctx, path, "provider",
+                                NULL, &provider);
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to fetch provider for [%s]!\n", domains[i]));
+        }
+        if (provider) info->has_provider = true;
+
+        ret = btreemap_set_value(nctx, &nctx->domain_map,
+                                 domains[i], info,
+                                 _domain_comparator);
+        if (ret != EOK) {
+            DEBUG(1, ("Failed to store domain info, aborting!\n"));
+            retval = ret;
+            goto done;
+        }
+
+        i++;
+        c++;
+    }
+    if (c == 0) {
+        /* No domains configured!
+         * Note: this should never happen, since LOCAL should
+         * always be configured */
+        DEBUG(0, ("No domains configured on this client!\n"));
+        retval = EINVAL;
+        goto done;
+    }
+
+    ret = confdb_get_string(nctx->cdb, nctx,
+                            "config/domains", "default",
+                            NULL, &nctx->default_domain);
+    if (ret != EOK) {
+        retval = ret;
+        goto done;
+    }
+
+    retval = EOK;
+
+done:
+    talloc_free(tmp_ctx);
+    return retval;
+}
+
+int nss_process_init(TALLOC_CTX *mem_ctx,
+                     struct event_context *ev,
+                     struct confdb_ctx *cdb)
+{
+    struct nss_ctx *nctx;
+    int ret;
+
+    nctx = talloc_zero(mem_ctx, struct nss_ctx);
+    if (!nctx) {
+        DEBUG(0, ("fatal error initializing nss_ctx\n"));
+        return ENOMEM;
+    }
+    nctx->ev = ev;
+    nctx->cdb = cdb;
+
+    ret = nss_init_domains(nctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error setting up domain map\n"));
+        return ret;
+    }
+
+    ret = nss_sbus_init(nctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error setting up message bus\n"));
+        return ret;
+    }
+
+    ret = nss_dp_init(nctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error setting up backend connector\n"));
+        return ret;
+    }
+
+    ret = sysdb_init(nctx, ev, cdb, NULL, &nctx->sysdb);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error initializing nss_ctx\n"));
+        return ret;
+    }
+
+    /* after all initializations we are ready to listen on our socket */
+    ret = set_unix_socket(nctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error initializing socket\n"));
+        return ret;
+    }
+
+    nctx->cache_timeout = 600; /* FIXME: read from conf */
+
+    DEBUG(1, ("NSS Initialization complete\n"));
+
+    return EOK;
+}
+
+int main(int argc, const char *argv[])
+{
+    int opt;
+    poptContext pc;
+    struct main_context *main_ctx;
+    int ret;
+
+	struct poptOption long_options[] = {
+		POPT_AUTOHELP
+        SSSD_MAIN_OPTS
+		{ NULL }
+	};
+
+	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;
+		}
+	}
+
+	poptFreeContext(pc);
+
+    /* set up things like debug , signals, daemonization, etc... */
+    ret = server_setup("sssd[nss]", 0, &main_ctx);
+    if (ret != EOK) return 2;
+
+    ret = nss_process_init(main_ctx,
+                           main_ctx->event_ctx,
+                           main_ctx->confdb_ctx);
+    if (ret != EOK) return 3;
+
+    /* loop on main */
+    server_loop(main_ctx);
+
+    return 0;
+}
+