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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
/*
* The following code handles the storage of PKCS 11 modules used by the
* NSS. For the rest of NSS, only one kind of database handle exists:
*
* SFTKDBHandle
*
* There is one SFTKDBHandle for each key database and one for each cert
* database. These databases are opened as associated pairs, one pair per
* slot. SFTKDBHandles are reference counted objects.
*
* Each SFTKDBHandle points to a low level database handle (SDB). This handle
* represents the underlying physical database. These objects are not
* reference counted, and are 'owned' by their respective SFTKDBHandles.
*/
#include "prprf.h"
#include "prsystem.h"
#include "secport.h"
#include "utilpars.h"
#include "secerr.h"
#if defined(_WIN32)
#include <io.h>
#include <windows.h>
#endif
#ifdef XP_UNIX
#include <unistd.h>
#endif
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#if defined(_WIN32)
#define os_fdopen _fdopen
#define os_truncate_open_flags _O_CREAT | _O_RDWR | _O_TRUNC
#define os_append_open_flags _O_CREAT | _O_RDWR | _O_APPEND
#define os_open_permissions_type int
#define os_open_permissions_default _S_IREAD | _S_IWRITE
#define os_stat_type struct _stat
/*
* Convert a UTF8 string to Unicode wide character
*/
LPWSTR
_NSSUTIL_UTF8ToWide(const char *buf)
{
DWORD size;
LPWSTR wide;
if (!buf) {
return NULL;
}
size = MultiByteToWideChar(CP_UTF8, 0, buf, -1, NULL, 0);
if (size == 0) {
return NULL;
}
wide = PORT_Alloc(sizeof(WCHAR) * size);
if (!wide) {
return NULL;
}
size = MultiByteToWideChar(CP_UTF8, 0, buf, -1, wide, size);
if (size == 0) {
PORT_Free(wide);
return NULL;
}
return wide;
}
static int
os_open(const char *filename, int oflag, int pmode)
{
int fd;
if (!filename) {
return -1;
}
wchar_t *filenameWide = _NSSUTIL_UTF8ToWide(filename);
if (!filenameWide) {
return -1;
}
fd = _wopen(filenameWide, oflag, pmode);
PORT_Free(filenameWide);
return fd;
}
static int
os_stat(const char *path, os_stat_type *buffer)
{
int result;
if (!path) {
return -1;
}
wchar_t *pathWide = _NSSUTIL_UTF8ToWide(path);
if (!pathWide) {
return -1;
}
result = _wstat(pathWide, buffer);
PORT_Free(pathWide);
return result;
}
static FILE *
os_fopen(const char *filename, const char *mode)
{
FILE *fp;
if (!filename || !mode) {
return NULL;
}
wchar_t *filenameWide = _NSSUTIL_UTF8ToWide(filename);
if (!filenameWide) {
return NULL;
}
wchar_t *modeWide = _NSSUTIL_UTF8ToWide(mode);
if (!modeWide) {
PORT_Free(filenameWide);
return NULL;
}
fp = _wfopen(filenameWide, modeWide);
PORT_Free(filenameWide);
PORT_Free(modeWide);
return fp;
}
PRStatus
_NSSUTIL_Access(const char *path, PRAccessHow how)
{
int result;
if (!path) {
return PR_FAILURE;
}
int mode;
switch (how) {
case PR_ACCESS_WRITE_OK:
mode = 2;
break;
case PR_ACCESS_READ_OK:
mode = 4;
break;
case PR_ACCESS_EXISTS:
mode = 0;
break;
default:
return PR_FAILURE;
}
wchar_t *pathWide = _NSSUTIL_UTF8ToWide(path);
if (!pathWide) {
return PR_FAILURE;
}
result = _waccess(pathWide, mode);
PORT_Free(pathWide);
return result < 0 ? PR_FAILURE : PR_SUCCESS;
}
static PRStatus
nssutil_Delete(const char *name)
{
BOOL result;
if (!name) {
return PR_FAILURE;
}
wchar_t *nameWide = _NSSUTIL_UTF8ToWide(name);
if (!nameWide) {
return PR_FAILURE;
}
result = DeleteFileW(nameWide);
PORT_Free(nameWide);
return result ? PR_SUCCESS : PR_FAILURE;
}
static PRStatus
nssutil_Rename(const char *from, const char *to)
{
BOOL result;
if (!from || !to) {
return PR_FAILURE;
}
wchar_t *fromWide = _NSSUTIL_UTF8ToWide(from);
if (!fromWide) {
return PR_FAILURE;
}
wchar_t *toWide = _NSSUTIL_UTF8ToWide(to);
if (!toWide) {
PORT_Free(fromWide);
return PR_FAILURE;
}
result = MoveFileW(fromWide, toWide);
PORT_Free(fromWide);
PORT_Free(toWide);
return result ? PR_SUCCESS : PR_FAILURE;
}
#else
#define os_fopen fopen
#define os_open open
#define os_fdopen fdopen
#define os_stat stat
#define os_truncate_open_flags O_CREAT | O_RDWR | O_TRUNC
#define os_append_open_flags O_CREAT | O_RDWR | O_APPEND
#define os_open_permissions_type mode_t
#define os_open_permissions_default 0600
#define os_stat_type struct stat
#define nssutil_Delete PR_Delete
#define nssutil_Rename PR_Rename
#endif
/****************************************************************
*
* Secmod database.
*
* The new secmod database is simply a text file with each of the module
* entries in the following form:
*
* #
* # This is a comment The next line is the library to load
* library=libmypkcs11.so
* name="My PKCS#11 module"
* params="my library's param string"
* nss="NSS parameters"
* other="parameters for other libraries and applications"
*
* library=libmynextpk11.so
* name="My other PKCS#11 module"
*/
/*
* Smart string cat functions. Automatically manage the memory.
* The first parameter is the destination string. If it's null, we
* allocate memory for it. If it's not, we reallocate memory
* so the the concanenated string fits.
*/
static char *
nssutil_DupnCat(char *baseString, const char *str, int str_len)
{
int baseStringLen = baseString ? PORT_Strlen(baseString) : 0;
int len = baseStringLen + 1;
char *newString;
len += str_len;
newString = (char *)PORT_Realloc(baseString, len);
if (newString == NULL) {
PORT_Free(baseString);
return NULL;
}
PORT_Memcpy(&newString[baseStringLen], str, str_len);
newString[len - 1] = 0;
return newString;
}
/* Same as nssutil_DupnCat except it concatenates the full string, not a
* partial one */
static char *
nssutil_DupCat(char *baseString, const char *str)
{
return nssutil_DupnCat(baseString, str, PORT_Strlen(str));
}
/* function to free up all the memory associated with a null terminated
* array of module specs */
static SECStatus
nssutil_releaseSpecList(char **moduleSpecList)
{
if (moduleSpecList) {
char **index;
for (index = moduleSpecList; *index; index++) {
PORT_Free(*index);
}
PORT_Free(moduleSpecList);
}
return SECSuccess;
}
#define SECMOD_STEP 10
static SECStatus
nssutil_growList(char ***pModuleList, int *useCount, int last)
{
char **newModuleList;
*useCount += SECMOD_STEP;
newModuleList = (char **)PORT_Realloc(*pModuleList,
*useCount * sizeof(char *));
if (newModuleList == NULL) {
return SECFailure;
}
PORT_Memset(&newModuleList[last], 0, sizeof(char *) * SECMOD_STEP);
*pModuleList = newModuleList;
return SECSuccess;
}
static char *
_NSSUTIL_GetOldSecmodName(const char *dbname, const char *filename)
{
char *file = NULL;
char *dirPath = PORT_Strdup(dbname);
char *sep;
sep = PORT_Strrchr(dirPath, *NSSUTIL_PATH_SEPARATOR);
#ifdef _WIN32
if (!sep) {
/* utilparst.h defines NSSUTIL_PATH_SEPARATOR as "/" for all
* platforms. */
sep = PORT_Strrchr(dirPath, '\\');
}
#endif
if (sep) {
*sep = 0;
file = PR_smprintf("%s" NSSUTIL_PATH_SEPARATOR "%s", dirPath, filename);
} else {
file = PR_smprintf("%s", filename);
}
PORT_Free(dirPath);
return file;
}
static SECStatus nssutil_AddSecmodDBEntry(const char *appName,
const char *filename,
const char *dbname,
const char *module, PRBool rw);
enum lfopen_mode { lfopen_truncate,
lfopen_append };
FILE *
lfopen(const char *name, enum lfopen_mode om, os_open_permissions_type open_perms)
{
int fd;
FILE *file;
fd = os_open(name,
(om == lfopen_truncate) ? os_truncate_open_flags : os_append_open_flags,
open_perms);
if (fd < 0) {
return NULL;
}
file = os_fdopen(fd, (om == lfopen_truncate) ? "w+" : "a+");
if (!file) {
close(fd);
}
/* file inherits fd */
return file;
}
#define MAX_LINE_LENGTH 2048
/*
* Read all the existing modules in out of the file.
*/
static char **
nssutil_ReadSecmodDB(const char *appName,
const char *filename, const char *dbname,
char *params, PRBool rw)
{
FILE *fd = NULL;
char **moduleList = NULL;
int moduleCount = 1;
int useCount = SECMOD_STEP;
char line[MAX_LINE_LENGTH];
PRBool internal = PR_FALSE;
PRBool skipParams = PR_FALSE;
char *moduleString = NULL;
char *paramsValue = NULL;
PRBool failed = PR_TRUE;
moduleList = (char **)PORT_ZAlloc(useCount * sizeof(char *));
if (moduleList == NULL)
return NULL;
if (dbname == NULL) {
goto return_default;
}
/* do we really want to use streams here */
fd = os_fopen(dbname, "r");
if (fd == NULL)
goto done;
/*
* the following loop takes line separated config lines and collapses
* the lines to a single string, escaping and quoting as necessary.
*/
/* loop state variables */
moduleString = NULL; /* current concatenated string */
internal = PR_FALSE; /* is this an internal module */
skipParams = PR_FALSE; /* did we find an override parameter block*/
paramsValue = NULL; /* the current parameter block value */
do {
int len;
if (fgets(line, sizeof(line), fd) == NULL) {
goto endloop;
}
/* remove the ending newline */
len = PORT_Strlen(line);
if (len >= 2 && line[len - 2] == '\r' && line[len - 1] == '\n') {
len = len - 2;
line[len] = 0;
} else if (len && (line[len - 1] == '\n' || line[len - 1] == '\r')) {
len--;
line[len] = 0;
}
if (*line == '#') {
continue;
}
if (*line != 0) {
/*
* The PKCS #11 group standard assumes blocks of strings
* separated by new lines, clumped by new lines. Internally
* we take strings separated by spaces, so we may need to escape
* certain spaces.
*/
char *value = PORT_Strchr(line, '=');
/* there is no value, write out the stanza as is */
if (value == NULL || value[1] == 0) {
if (moduleString) {
moduleString = nssutil_DupnCat(moduleString, " ", 1);
if (moduleString == NULL)
goto loser;
}
moduleString = nssutil_DupCat(moduleString, line);
if (moduleString == NULL)
goto loser;
/* value is already quoted, just write it out */
} else if (value[1] == '"') {
if (moduleString) {
moduleString = nssutil_DupnCat(moduleString, " ", 1);
if (moduleString == NULL)
goto loser;
}
moduleString = nssutil_DupCat(moduleString, line);
if (moduleString == NULL)
goto loser;
/* we have an override parameter section, remember that
* we found this (see following comment about why this
* is necessary). */
if (PORT_Strncasecmp(line, "parameters", 10) == 0) {
skipParams = PR_TRUE;
}
/*
* The internal token always overrides it's parameter block
* from the passed in parameters, so wait until then end
* before we include the parameter block in case we need to
* override it. NOTE: if the parameter block is quoted with ("),
* this override does not happen. This allows you to override
* the application's parameter configuration.
*
* parameter block state is controlled by the following variables:
* skipParams - Bool : set to true of we have an override param
* block (all other blocks, either implicit or explicit are
* ignored).
* paramsValue - char * : pointer to the current param block. In
* the absence of overrides, paramsValue is set to the first
* parameter block we find. All subsequent blocks are ignored.
* When we find an internal token, the application passed
* parameters take precident.
*/
} else if (PORT_Strncasecmp(line, "parameters", 10) == 0) {
/* already have parameters */
if (paramsValue) {
continue;
}
paramsValue = NSSUTIL_Quote(&value[1], '"');
if (paramsValue == NULL)
goto loser;
continue;
} else {
/* may need to quote */
char *newLine;
if (moduleString) {
moduleString = nssutil_DupnCat(moduleString, " ", 1);
if (moduleString == NULL)
goto loser;
}
moduleString = nssutil_DupnCat(moduleString, line, value - line + 1);
if (moduleString == NULL)
goto loser;
newLine = NSSUTIL_Quote(&value[1], '"');
if (newLine == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString, newLine);
PORT_Free(newLine);
if (moduleString == NULL)
goto loser;
}
/* check to see if it's internal? */
if (PORT_Strncasecmp(line, "NSS=", 4) == 0) {
/* This should be case insensitive! reviewers make
* me fix it if it's not */
if (PORT_Strstr(line, "internal")) {
internal = PR_TRUE;
/* override the parameters */
if (paramsValue) {
PORT_Free(paramsValue);
}
paramsValue = NSSUTIL_Quote(params, '"');
}
}
continue;
}
if ((moduleString == NULL) || (*moduleString == 0)) {
continue;
}
endloop:
/*
* if we are here, we have found a complete stanza. Now write out
* any param section we may have found.
*/
if (paramsValue) {
/* we had an override */
if (!skipParams) {
moduleString = nssutil_DupnCat(moduleString, " parameters=", 12);
if (moduleString == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString, paramsValue);
if (moduleString == NULL)
goto loser;
}
PORT_Free(paramsValue);
paramsValue = NULL;
}
if ((moduleCount + 1) >= useCount) {
SECStatus rv;
rv = nssutil_growList(&moduleList, &useCount, moduleCount + 1);
if (rv != SECSuccess) {
goto loser;
}
}
if (internal) {
moduleList[0] = moduleString;
} else {
moduleList[moduleCount] = moduleString;
moduleCount++;
}
moduleString = NULL;
internal = PR_FALSE;
skipParams = PR_FALSE;
} while (!feof(fd));
if (moduleString) {
PORT_Free(moduleString);
moduleString = NULL;
}
done:
/* if we couldn't open a pkcs11 database, look for the old one */
if (fd == NULL) {
char *olddbname = _NSSUTIL_GetOldSecmodName(dbname, filename);
PRStatus status;
/* couldn't get the old name */
if (!olddbname) {
goto bail;
}
/* old one exists */
status = _NSSUTIL_Access(olddbname, PR_ACCESS_EXISTS);
if (status == PR_SUCCESS) {
PR_smprintf_free(olddbname);
PORT_ZFree(moduleList, useCount * sizeof(char *));
PORT_SetError(SEC_ERROR_LEGACY_DATABASE);
return NULL;
}
bail:
if (olddbname) {
PR_smprintf_free(olddbname);
}
}
return_default:
if (!moduleList[0]) {
char *newParams;
moduleString = PORT_Strdup(NSSUTIL_DEFAULT_INTERNAL_INIT1);
newParams = NSSUTIL_Quote(params, '"');
if (newParams == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString, newParams);
PORT_Free(newParams);
if (moduleString == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString,
NSSUTIL_DEFAULT_INTERNAL_INIT2);
if (moduleString == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString,
NSSUTIL_DEFAULT_SFTKN_FLAGS);
if (moduleString == NULL)
goto loser;
moduleString = nssutil_DupCat(moduleString,
NSSUTIL_DEFAULT_INTERNAL_INIT3);
if (moduleString == NULL)
goto loser;
moduleList[0] = moduleString;
moduleString = NULL;
}
failed = PR_FALSE;
loser:
/*
* cleanup
*/
/* deal with trust cert db here */
if (moduleString) {
PORT_Free(moduleString);
moduleString = NULL;
}
if (paramsValue) {
PORT_Free(paramsValue);
paramsValue = NULL;
}
if (failed || (moduleList[0] == NULL)) {
/* This is wrong! FIXME */
nssutil_releaseSpecList(moduleList);
moduleList = NULL;
failed = PR_TRUE;
}
if (fd != NULL) {
fclose(fd);
} else if (!failed && rw) {
/* update our internal module */
nssutil_AddSecmodDBEntry(appName, filename, dbname, moduleList[0], rw);
}
return moduleList;
}
static SECStatus
nssutil_ReleaseSecmodDBData(const char *appName,
const char *filename, const char *dbname,
char **moduleSpecList, PRBool rw)
{
if (moduleSpecList) {
nssutil_releaseSpecList(moduleSpecList);
}
return SECSuccess;
}
/*
* Delete a module from the Data Base
*/
static SECStatus
nssutil_DeleteSecmodDBEntry(const char *appName,
const char *filename,
const char *dbname,
const char *args,
PRBool rw)
{
/* SHDB_FIXME implement */
os_stat_type stat_existing;
os_open_permissions_type file_mode;
FILE *fd = NULL;
FILE *fd2 = NULL;
char line[MAX_LINE_LENGTH];
char *dbname2 = NULL;
char *block = NULL;
char *name = NULL;
char *lib = NULL;
int name_len = 0, lib_len = 0;
PRBool skip = PR_FALSE;
PRBool found = PR_FALSE;
if (dbname == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
if (!rw) {
PORT_SetError(SEC_ERROR_READ_ONLY);
return SECFailure;
}
dbname2 = PORT_Strdup(dbname);
if (dbname2 == NULL)
goto loser;
dbname2[strlen(dbname) - 1]++;
/* get the permissions of the existing file, or use the default */
if (!os_stat(dbname, &stat_existing)) {
file_mode = stat_existing.st_mode;
} else {
file_mode = os_open_permissions_default;
}
/* do we really want to use streams here */
fd = os_fopen(dbname, "r");
if (fd == NULL)
goto loser;
fd2 = lfopen(dbname2, lfopen_truncate, file_mode);
if (fd2 == NULL)
goto loser;
name = NSSUTIL_ArgGetParamValue("name", args);
if (name) {
name_len = PORT_Strlen(name);
}
lib = NSSUTIL_ArgGetParamValue("library", args);
if (lib) {
lib_len = PORT_Strlen(lib);
}
/*
* the following loop takes line separated config files and collapses
* the lines to a single string, escaping and quoting as necessary.
*/
/* loop state variables */
block = NULL;
skip = PR_FALSE;
while (fgets(line, sizeof(line), fd) != NULL) {
/* If we are processing a block (we haven't hit a blank line yet */
if (*line != '\n') {
/* skip means we are in the middle of a block we are deleting */
if (skip) {
continue;
}
/* if we haven't found the block yet, check to see if this block
* matches our requirements */
if (!found && ((name && (PORT_Strncasecmp(line, "name=", 5) == 0) &&
(PORT_Strncmp(line + 5, name, name_len) == 0)) ||
(lib && (PORT_Strncasecmp(line, "library=", 8) == 0) &&
(PORT_Strncmp(line + 8, lib, lib_len) == 0)))) {
/* yup, we don't need to save any more data, */
PORT_Free(block);
block = NULL;
/* we don't need to collect more of this block */
skip = PR_TRUE;
/* we don't need to continue searching for the block */
found = PR_TRUE;
continue;
}
/* not our match, continue to collect data in this block */
block = nssutil_DupCat(block, line);
continue;
}
/* we've collected a block of data that wasn't the module we were
* looking for, write it out */
if (block) {
fwrite(block, PORT_Strlen(block), 1, fd2);
PORT_Free(block);
block = NULL;
}
/* If we didn't just delete the this block, keep the blank line */
if (!skip) {
fputs(line, fd2);
}
/* we are definately not in a deleted block anymore */
skip = PR_FALSE;
}
fclose(fd);
fclose(fd2);
if (found) {
/* rename dbname2 to dbname */
nssutil_Delete(dbname);
nssutil_Rename(dbname2, dbname);
} else {
nssutil_Delete(dbname2);
}
PORT_Free(dbname2);
PORT_Free(lib);
PORT_Free(name);
PORT_Free(block);
return SECSuccess;
loser:
if (fd != NULL) {
fclose(fd);
}
if (fd2 != NULL) {
fclose(fd2);
}
if (dbname2) {
nssutil_Delete(dbname2);
PORT_Free(dbname2);
}
PORT_Free(lib);
PORT_Free(name);
return SECFailure;
}
/*
* Add a module to the Data base
*/
static SECStatus
nssutil_AddSecmodDBEntry(const char *appName,
const char *filename, const char *dbname,
const char *module, PRBool rw)
{
os_stat_type stat_existing;
os_open_permissions_type file_mode;
FILE *fd = NULL;
char *block = NULL;
PRBool libFound = PR_FALSE;
if (dbname == NULL) {
PORT_SetError(SEC_ERROR_INVALID_ARGS);
return SECFailure;
}
/* can't write to a read only module */
if (!rw) {
PORT_SetError(SEC_ERROR_READ_ONLY);
return SECFailure;
}
/* remove the previous version if it exists */
(void)nssutil_DeleteSecmodDBEntry(appName, filename, dbname, module, rw);
/* get the permissions of the existing file, or use the default */
if (!os_stat(dbname, &stat_existing)) {
file_mode = stat_existing.st_mode;
} else {
file_mode = os_open_permissions_default;
}
fd = lfopen(dbname, lfopen_append, file_mode);
if (fd == NULL) {
return SECFailure;
}
module = NSSUTIL_ArgStrip(module);
while (*module) {
int count;
char *keyEnd = PORT_Strchr(module, '=');
char *value;
if (PORT_Strncmp(module, "library=", 8) == 0) {
libFound = PR_TRUE;
}
if (keyEnd == NULL) {
block = nssutil_DupCat(block, module);
break;
}
block = nssutil_DupnCat(block, module, keyEnd - module + 1);
if (block == NULL) {
goto loser;
}
value = NSSUTIL_ArgFetchValue(&keyEnd[1], &count);
if (value) {
block = nssutil_DupCat(block, NSSUTIL_ArgStrip(value));
PORT_Free(value);
}
if (block == NULL) {
goto loser;
}
block = nssutil_DupnCat(block, "\n", 1);
module = keyEnd + 1 + count;
module = NSSUTIL_ArgStrip(module);
}
if (block) {
if (!libFound) {
fprintf(fd, "library=\n");
}
fwrite(block, PORT_Strlen(block), 1, fd);
fprintf(fd, "\n");
PORT_Free(block);
block = NULL;
}
fclose(fd);
return SECSuccess;
loser:
PORT_Free(block);
fclose(fd);
return SECFailure;
}
char **
NSSUTIL_DoModuleDBFunction(unsigned long function, char *parameters, void *args)
{
char *secmod = NULL;
char *appName = NULL;
char *filename = NULL;
NSSDBType dbType = NSS_DB_TYPE_NONE;
PRBool rw;
static char *success = "Success";
char **rvstr = NULL;
secmod = _NSSUTIL_GetSecmodName(parameters, &dbType, &appName,
&filename, &rw);
if ((dbType == NSS_DB_TYPE_LEGACY) ||
(dbType == NSS_DB_TYPE_MULTIACCESS)) {
/* we can't handle the old database, only softoken can */
PORT_SetError(SEC_ERROR_LEGACY_DATABASE);
rvstr = NULL;
goto done;
}
switch (function) {
case SECMOD_MODULE_DB_FUNCTION_FIND:
rvstr = nssutil_ReadSecmodDB(appName, filename,
secmod, (char *)parameters, rw);
break;
case SECMOD_MODULE_DB_FUNCTION_ADD:
rvstr = (nssutil_AddSecmodDBEntry(appName, filename,
secmod, (char *)args, rw) == SECSuccess)
? &success
: NULL;
break;
case SECMOD_MODULE_DB_FUNCTION_DEL:
rvstr = (nssutil_DeleteSecmodDBEntry(appName, filename,
secmod, (char *)args, rw) == SECSuccess)
? &success
: NULL;
break;
case SECMOD_MODULE_DB_FUNCTION_RELEASE:
rvstr = (nssutil_ReleaseSecmodDBData(appName, filename,
secmod, (char **)args, rw) == SECSuccess)
? &success
: NULL;
break;
}
done:
if (secmod)
PR_smprintf_free(secmod);
if (appName)
PORT_Free(appName);
if (filename)
PORT_Free(filename);
return rvstr;
}