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/*
* Copyright (C) 2003-2011 by CERN/IT/ADC/CA Benjamin Couturier
* All rights reserved
*/
#ifndef lint
static char sccsid[] = "@(#)$RCSfile: Csec_api_loader.c,v $ $Revision: 6384 $ $Date: 2012-06-06 16:39:34 +0200 (Wed, 06 Jun 2012) $ CERN IT/ADC/CA Benjamin Couturier";
#endif
/*
* Csec_api_loader.c - API function used for authentication in CASTOR
*/
#include <osdep.h>
#include <stddef.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>
#include <fcntl.h>
#include <stdarg.h>
#if defined(_WIN32)
#include <winsock2.h>
#else
#include <unistd.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#endif
#include "marshall.h"
#include "serrno.h"
#include "Cnetdb.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/stat.h>
#include "Cglobals.h"
#include "Cmutex.h"
#include <net.h>
#include <dlfcn.h>
#include "Csec.h"
#define _CSEC_CALLS_PLUGIN
#include "Csec_plugin.h"
#include "Cthread_env.h"
/* Macro to initialize one symbol in the context structure */
#define DLSETFUNC(CTX, HDL, SYM, SFX) strcpy(symname, #SYM "_");\
strcat(symname, CTX->protocols[CTX->current_protocol].id); \
strcat(symname, SFX); \
if ((PLUGINFP(CTX,SYM) = dlsym(HDL, symname)) == NULL) { \
serrno = ESEC_NO_SECMECH; \
Csec_errmsg(func, "Error finding symbol %s: %s", \
symname, dlerror()); \
free(CTX->shhandle); \
CTX->shhandle = NULL; \
return NULL; } \
CTX->SYM = &__CONCAT(SYM,_caller);
static void *list_base=NULL;
typedef struct {
char id[CA_MAXCSECPROTOLEN+1];
char suffix[CA_MAXNAMELEN];
void *dlhandle;
void *next;
} id_list_t;
/* Local protos */
static id_list_t * DLL_DECL _check_for_id _PROTO((char *));
static int DLL_DECL _add_id _PROTO((id_list_t *));
static int DLL_DECL _try_activate_func _PROTO((Csec_context_t *,void *, char *));
/* List handling */
static int list_lock;
static id_list_t *_check_for_id(char *id) {
char *func = "_check_for_id";
id_list_t *element;
Csec_trace(func, "Trying to lookup %s\n",id);
element = list_base;
while(element != NULL) {
if (strcmp(element->id, id) == 0) {
Csec_trace(func, "Found %s\n",id);
break;
}
element = element->next;
}
if (element == NULL)
Csec_trace(func, "Did not find %s\n",id);
return element;
}
static int _add_id(id_list_t *new) {
char *func = "_add_id";
id_list_t *element;
Csec_trace(func, "Trying to add %s to list\n",new->id);
if (_check_for_id(new->id) != NULL) {
Csec_errmsg(func, "Element with same id already in list");
serrno = SEINTERNAL;
return -1;
}
element = malloc(sizeof(id_list_t));
if (element == NULL) {
Csec_errmsg(func, "Could not allocate memory for buffer");
serrno = 0;
return -1;
}
memcpy(element,new,sizeof(id_list_t));
element->next = NULL;
if (list_base == NULL) {
list_base = element;
Csec_trace(func, "Added as first element\n");
} else {
id_list_t *n;
n = list_base;
while(n->next != NULL) {
n=n->next;
}
n->next = element;
Csec_trace(func, "Added to end of list\n");
}
Csec_trace(func, "Exiting\n");
return 0;
}
/* End of list operations */
static int _try_activate_func(Csec_context_t *ctx,void *hdl, char *sfx) {
char symname[256];
char *mech = ctx->protocols[ctx->current_protocol].id;
char *func = "_try_activate_func";
int ret;
Csec_trace(func, "Entering\n");
strcpy(symname, "Csec_activate");
strcat(symname, "_");
strcat(symname, mech);
strcat(symname, sfx);
Csec_trace(func, "Meth: %s\n", symname);
ctx->shhandle = malloc(sizeof(Csec_plugin_pluginptrs_t));
if (ctx->shhandle == NULL) {
Csec_errmsg(func, "Could not allocate memory for context plugin handle");
serrno = ENOMEM;
return -1;
}
PLUGINFP(ctx,handle) = hdl;
PLUGINFP(ctx,Csec_activate) = dlsym(hdl, symname);
if (PLUGINFP(ctx,Csec_activate) == NULL) {
free(ctx->shhandle);
ctx->shhandle = NULL;
return -1;
}
ret = Csec_activate_caller(ctx);
free(ctx->shhandle);
ctx->shhandle = NULL;
return ret;
}
/* Don't actually unload library, avoid possibility of
memory leaks in the sec libraries themseleves through
multiple initialisations
*/
void Csec_unload_shlib(Csec_context_t *ctx) {
char *func = "Csec_unload_shlib";
Csec_trace(func, "Entering\n");
if (ctx->shhandle != NULL) {
/* Csec_trace(func, "Calling deactivate method\n");
(void) (*(ctx->Csec_deactivate))(ctx);
Csec_trace(func, "Called deactivate method\n");
dlclose(PLUGINFP(ctx,handle)); */
free(ctx->shhandle);
ctx->shhandle = NULL;
}
/* Just keep the 3 initial flags.
FIXME Should probably clear contexts and
credentials, if they were set */
ctx->flags &= (CSEC_CTX_INITIALIZED
|CSEC_CTX_SERVICE_TYPE_SET
|CSEC_CTX_PROTOCOL_LOADED);
ctx->Csec_activate = NULL;
ctx->Csec_deactivate = NULL;
ctx->Csec_init_context = NULL;
ctx->Csec_reinit_context = NULL;
ctx->Csec_delete_connection_context = NULL;
ctx->Csec_delete_creds = NULL;
ctx->Csec_acquire_creds = NULL;
ctx->Csec_server_establish_context_ext = NULL;
ctx->Csec_client_establish_context = NULL;
ctx->Csec_map2name = NULL;
ctx->Csec_get_service_name = NULL;
}
/**
* Gets the shared library corresponding to the context !
*/
void *Csec_get_shlib(Csec_context_t *ctx) {
char filename[CA_MAXNAMELEN];
char filename_thread[CA_MAXNAMELEN];
char fullpath[CA_MAXNAMELEN];
char suffix[CA_MAXNAMELEN];
char symname[256];
void *handle;
char *func = "Csec_get_shlib";
id_list_t *lp;
static int once = 0;
static int csec_nothread = 0;
char *CSEC_NOTHREAD;
Csec_trace(func, "Loading plugin\n");
if ( ! once ) {
if ((CSEC_NOTHREAD = Cthread_getenv("CSEC_NOTHREAD")) != NULL)
csec_nothread = atoi(CSEC_NOTHREAD);
once++;
}
/* Checking input */
if (ctx == NULL) {
serrno = EINVAL;
Csec_errmsg(func, "Context is NULL");
return NULL;
}
if (ctx->current_protocol < 0) {
serrno = EINVAL;
Csec_errmsg(func, "No valid protocol currently selected");
return NULL;
}
/* Checking that a shared library isn't already loaded,
and closing in case ! */
if (ctx->shhandle != NULL) {
Csec_trace(func, "Forcing unload of shlib\n");
Csec_unload_shlib(ctx);
}
/* Setup the symbol suffix */
suffix[0] = '\0';
if (strcmp(ctx->protocols[ctx->current_protocol].id,"GSI")==0 && ctx->thread_safe) {
if (csec_nothread)
Csec_trace(func, "NOT TRYING TO LOAD _pthr !!\n");
else {
Csec_trace(func, " TRYING TO LOAD _pthr !!\n");
strcpy(suffix,"_pthr");
}
}
Csec_trace(func, "Trying to acquire mutex\n");
if (Cmutex_lock(&list_lock, -1)<0) {
Csec_errmsg(func, "Could not lock list_lock");
return NULL;
}
Csec_trace(func, "Locked mutex\n");
if ((lp = _check_for_id(ctx->protocols[ctx->current_protocol].id)) == NULL) {
id_list_t list;
Csec_trace(func, "Could not find library in linked list. Will try to load it\n");
/* Creating the library name */
snprintf(filename, CA_MAXNAMELEN, "libCsec_plugin_%s", ctx->protocols[ctx->current_protocol].id);
strcpy(filename_thread,filename);
#if defined(__APPLE__)
strcat(filename,".dylib");
strcat(filename_thread,"_thread.dylib");
#else
strcat(filename,".so");
strcat(filename_thread,"_thread.so");
#endif
handle = NULL;
if (ctx->thread_safe && ! csec_nothread ) {
Csec_trace(func, "Using shared library <%s> for mechanism <%s>\n",
filename_thread,
ctx->protocols[ctx->current_protocol].id);
handle = dlopen(filename_thread, RTLD_NOW);
if (handle == NULL) {
strcpy(fullpath, LIBDIR);
strcat(fullpath, "/");
strcat(fullpath, filename_thread);
handle = dlopen(fullpath, RTLD_NOW);
}
}
if (handle == NULL) {
suffix[0] = '\0';
Csec_trace(func, "Using shared library <%s> for mechanism <%s>\n",
filename,
ctx->protocols[ctx->current_protocol].id);
handle = dlopen(filename, RTLD_NOW);
if (handle == NULL) {
strcpy(fullpath, LIBDIR);
strcat(fullpath, "/");
strcat(fullpath, filename);
handle = dlopen(fullpath, RTLD_NOW);
}
}
if (handle == NULL) {
char dlerrmsg[ERRBUFSIZE+1];
Cmutex_unlock(&list_lock);
serrno = ESEC_NO_SECMECH;
strncpy(dlerrmsg, dlerror(), ERRBUFSIZE);
ctx->shhandle = NULL;
Csec_trace(func, "Error opening shared library %s: %s\n", filename,
dlerrmsg);
Csec_errmsg(func, "Error opening shared library %s: %s", filename,
dlerrmsg);
return NULL;
}
if (_try_activate_func(ctx,handle, suffix)<0) {
dlclose(handle);
Cmutex_unlock(&list_lock);
serrno = EINVAL;
Csec_errmsg(func, "Error calling activate method");
return NULL;
}
Csec_trace(func, "Called activate method OK\n");
strncpy(list.id, ctx->protocols[ctx->current_protocol].id, CA_MAXCSECPROTOLEN);
list.id[CA_MAXCSECPROTOLEN] = '\0';
strcpy(list.suffix, suffix);
list.dlhandle = handle;
if (_add_id(&list)<0) {
Cmutex_unlock(&list_lock);
Csec_errmsg(func, "Could not add new id to list");
return NULL;
}
Csec_trace(func, "Library loaded and entry added to list\n");
} else {
Csec_trace(func, "Using previously loaded library for %s\n",lp->id);
handle = lp->dlhandle;
strcpy(suffix, lp->suffix);
}
Csec_trace(func, "Unlocking mutex\n");
if (Cmutex_unlock(&list_lock)<0) {
Csec_errmsg(func, "Could not unlock list_lock");
return NULL;
}
ctx->shhandle = malloc(sizeof(Csec_plugin_pluginptrs_t));
if (ctx->shhandle == NULL) {
Csec_errmsg(func, "Could not allocate memory for context plugin handle");
serrno = ENOMEM;
return NULL;
}
PLUGINFP(ctx,handle) = handle;
DLSETFUNC(ctx, handle, Csec_activate, suffix);
DLSETFUNC(ctx, handle, Csec_deactivate, suffix);
DLSETFUNC(ctx, handle, Csec_init_context, suffix);
DLSETFUNC(ctx, handle, Csec_reinit_context, suffix);
DLSETFUNC(ctx, handle, Csec_delete_connection_context, suffix);
DLSETFUNC(ctx, handle, Csec_delete_creds,suffix);
DLSETFUNC(ctx, handle, Csec_acquire_creds, suffix);
DLSETFUNC(ctx, handle, Csec_server_establish_context_ext, suffix);
DLSETFUNC(ctx, handle, Csec_client_establish_context, suffix);
DLSETFUNC(ctx, handle, Csec_map2name, suffix);
DLSETFUNC(ctx, handle, Csec_get_service_name, suffix);
ctx->flags |= CSEC_CTX_SHLIB_LOADED;
return handle;
}
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