Initial work on a test provider using the gross hack of dlopen()ing nss_ldap

:-)

5 files changed, 196 insertions, 11 deletions

diff --git a/server/Makefile.in b/server/Makefile.in
index fa57d8030..a1f87eb54 100644
--- a/server/Makefile.in
+++ b/server/Makefile.in
@@ -60,6 +60,7 @@ OBJS = $(SERVER_OBJ) @LIBREPLACEOBJ@ $(EXTRA_OBJ)
 headers = .h
 
 BINS = sbin/sssd sbin/sssd_nss sbin/sssd_dp sbin/sssd_be
+SOLIBS = lib/libsss_ldap.$(SHLIBEXT)
 
 DIRS = sbin
 
@@ -67,7 +68,7 @@ default: all
 
 include $(srvdir)/rules.mk
 
-all: showflags dirs $(OBJS) $(BINS)
+all: showflags dirs $(OBJS) $(BINS) $(SOLIBS)
 
 shared-build: all
 
@@ -76,7 +77,7 @@ dirs:
 
 clean::
 	rm -f *.o */*.o */*/*.o
-	rm -f $(BINS)
+	rm -f $(BINS) $(SOLIBS)
 
 distclean:: clean
 	rm -rf $(DIRS)
diff --git a/server/providers/data_provider.h b/server/providers/data_provider.h
index cd8098ba0..b04c57d0b 100644
--- a/server/providers/data_provider.h
+++ b/server/providers/data_provider.h
@@ -49,4 +49,8 @@
 #define DP_CLI_METHOD_IDENTITY "getIdentity"
 #define DP_CLI_METHOD_ONLINE "getOnline"
 
+struct dp_be_mod_ops {
+    int (*check_online)(void *pvt_data, int *reply);
+};
+
 #endif /* __DATA_PROVIDER_ */
diff --git a/server/providers/data_provider_be.c b/server/providers/data_provider_be.c
index 83659bee9..cce4446f2 100644
--- a/server/providers/data_provider_be.c
+++ b/server/providers/data_provider_be.c
@@ -38,13 +38,9 @@
 #include "sbus/sssd_dbus.h"
 #include "sbus_interfaces.h"
 #include "util/btreemap.h"
-#include "data_provider.h"
+#include "providers/data_provider.h"
 #include "util/service_helpers.h"
 
-struct dp_mod_ops {
-    int (*check_online)(void *pvt_data, int *reply);
-};
-
 struct be_ctx {
     struct event_context *ev;
     struct confdb_ctx *cdb;
@@ -54,11 +50,11 @@ struct be_ctx {
     const char *name;
     const char *domain;
     const char *identity;
-    struct dp_mod_ops *ops;
+    struct dp_be_mod_ops *ops;
     void *pvt_data;
 };
 
-typedef int (*be_init_fn_t)(struct be_ctx *, struct dp_mod_ops **, void **);
+typedef int (*be_init_fn_t)(TALLOC_CTX *, struct dp_be_mod_ops **, void **);
 
 static int service_identity(DBusMessage *message, void *data, DBusMessage **r);
 static int service_pong(DBusMessage *message, void *data, DBusMessage **r);
@@ -374,6 +370,10 @@ static int load_backend(struct be_ctx *ctx)
 
     path = talloc_asprintf(tmp_ctx, "%s/libsss_%s.so",
                            DATA_PROVIDER_PLUGINS_PATH, ctx->name);
+    if (!path) {
+        ret = ENOMEM;
+        goto done;
+    }
 
     handle = dlopen(path, RTLD_NOW);
     if (!handle) {
@@ -427,9 +427,10 @@ int be_process_init(TALLOC_CTX *mem_ctx,
     }
     ctx->ev = ev;
     ctx->cdb = cdb;
+    ctx->name = talloc_strdup(ctx, be_name);
     ctx->domain = talloc_strdup(ctx, be_domain);
     ctx->identity = talloc_asprintf(ctx, "%%BE_%s", be_domain);
-    if (!ctx->domain || !ctx->identity) {
+    if (!ctx->name || !ctx->domain || !ctx->identity) {
         DEBUG(0, ("Out of memory!?\n"));
         return ENOMEM;
     }
diff --git a/server/providers/ldap_provider.c b/server/providers/ldap_provider.c
new file mode 100644
index 000000000..a6628f40a
--- /dev/null
+++ b/server/providers/ldap_provider.c
@@ -0,0 +1,173 @@
+/*
+   SSSD
+
+   Test LDAP Module
+
+   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 <nss.h>
+#include <errno.h>
+#include <pwd.h>
+#include <grp.h>
+#include "util/util.h"
+#include "providers/data_provider.h"
+
+struct ldap_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 ldap_ctx {
+    struct ldap_nss_ops ops;
+};
+
+static int ldap_check_online(void *pvt_data, int *reply);
+
+struct dp_be_mod_ops ldap_mod_ops = {
+    .check_online = ldap_check_online
+};
+
+static int ldap_check_online(void *pvt_data, int *reply)
+{
+    *reply = MOD_ONLINE;
+    return EOK;
+}
+
+int sssm_ldap_init(TALLOC_CTX *bectx, struct dp_be_mod_ops **ops, void **pvt_data)
+{
+    struct ldap_ctx *ctx;
+    void *handle;
+    int ret;
+
+    ctx = talloc(bectx, struct ldap_ctx);
+    if (!ctx) {
+        return ENOMEM;
+    }
+
+    handle = dlopen("/usr/lib64/libnss_ldap.so.2", RTLD_NOW);
+    if (!handle) {
+        DEBUG(0, ("Unable to load libnss_ldap module with path, error: %s\n", dlerror()));
+        ret = ELIBACC;
+        goto done;
+    }
+
+    ctx->ops.getpwnam_r = dlsym(handle, "_nss_ldap_getpwnam_r");
+    if (!ctx->ops.getpwnam_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.getpwuid_r = dlsym(handle, "_nss_ldap_getpwuid_r");
+    if (!ctx->ops.getpwuid_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.setpwent = dlsym(handle, "_nss_ldap_setpwent");
+    if (!ctx->ops.setpwent) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.getpwent_r = dlsym(handle, "_nss_ldap_getpwent_r");
+    if (!ctx->ops.getpwent_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.endpwent = dlsym(handle, "_nss_ldap_endpwent");
+    if (!ctx->ops.endpwent) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.getgrnam_r = dlsym(handle, "_nss_ldap_getgrnam_r");
+    if (!ctx->ops.getgrnam_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.getgrgid_r = dlsym(handle, "_nss_ldap_getgrgid_r");
+    if (!ctx->ops.getgrgid_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.setgrent = dlsym(handle, "_nss_ldap_setgrent");
+    if (!ctx->ops.setgrent) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.getgrent_r = dlsym(handle, "_nss_ldap_getgrent_r");
+    if (!ctx->ops.getgrent_r) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.endgrent = dlsym(handle, "_nss_ldap_endgrent");
+    if (!ctx->ops.endgrent) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ctx->ops.initgroups_dyn = dlsym(handle, "_nss_ldap_initgroups_dyn");
+    if (!ctx->ops.initgroups_dyn) {
+        DEBUG(0, ("Failed to load NSS fns, error: %s\n", dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    *ops = &ldap_mod_ops;
+    *pvt_data = ctx;
+    ret = EOK;
+
+done:
+    if (ret != EOK) {
+        talloc_free(ctx);
+    }
+    return ret;
+}
diff --git a/server/server.mk b/server/server.mk
index 7f9274d92..f41c247ac 100644
--- a/server/server.mk
+++ b/server/server.mk
@@ -19,6 +19,9 @@ DP_OBJ = \
 DP_BE_OBJ = \
 	providers/data_provider_be.o
 
+LDAP_BE_OBJ = \
+	providers/ldap_provider.o
+
 NSSSRV_OBJ = \
     nss/nsssrv.o \
     nss/nsssrv_packet.o \
@@ -39,4 +42,7 @@ sbin/sssd_dp: $(DP_OBJ) $(UTIL_OBJ)
 	$(CC) -o sbin/sssd_dp $(DP_OBJ) $(UTIL_OBJ) $(LDFLAGS) $(LIBS)
 
 sbin/sssd_be: $(DP_BE_OBJ) $(UTIL_OBJ)
-	$(CC) -o sbin/sssd_be $(DP_BE_OBJ) $(UTIL_OBJ) $(LDFLAGS) $(LIBS)
+	$(CC) -Wl,-E -o sbin/sssd_be $(DP_BE_OBJ) $(UTIL_OBJ) $(LDFLAGS) $(LIBS)
+
+lib/libsss_ldap.$(SHLIBEXT): $(LDAP_BE_OBJ)
+	$(SHLD) $(SHLD_FLAGS) -o $@ $(LDAP_BE_OBJ) $(LDFLAGS) $(LIBS)