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openssl/crypto/conf/conf_def.c
Pauli 2661d716d9 It isn't necessary to initialise a struct stat before a stat(2) system call. 
The initialisation was also flawed, failing to account for padding and
alignment bytes.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8611)
2019-03-29 20:52:00 +10:00

879 lines
23 KiB
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/*
* Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/* Part of the code in here was originally in conf.c, which is now removed */
#include <stdio.h>
#include <string.h>
#include "internal/cryptlib.h"
#include "internal/o_dir.h"
#include <openssl/lhash.h>
#include <openssl/conf.h>
#include <openssl/conf_api.h>
#include "conf_def.h"
#include <openssl/buffer.h>
#include <openssl/err.h>
#ifndef OPENSSL_NO_POSIX_IO
# include <sys/stat.h>
# ifdef _WIN32
# define stat _stat
# define strcasecmp _stricmp
# endif
#endif
#ifndef S_ISDIR
# define S_ISDIR(a) (((a) & S_IFMT) == S_IFDIR)
#endif
/*
* The maximum length we can grow a value to after variable expansion. 64k
* should be more than enough for all reasonable uses.
*/
#define MAX_CONF_VALUE_LENGTH 65536
static int is_keytype(const CONF *conf, char c, unsigned short type);
static char *eat_ws(CONF *conf, char *p);
static void trim_ws(CONF *conf, char *start);
static char *eat_alpha_numeric(CONF *conf, char *p);
static void clear_comments(CONF *conf, char *p);
static int str_copy(CONF *conf, char *section, char **to, char *from);
static char *scan_quote(CONF *conf, char *p);
static char *scan_dquote(CONF *conf, char *p);
#define scan_esc(conf,p) (((IS_EOF((conf),(p)[1]))?((p)+1):((p)+2)))
#ifndef OPENSSL_NO_POSIX_IO
static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
char **dirpath);
static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx);
#endif
static CONF *def_create(CONF_METHOD *meth);
static int def_init_default(CONF *conf);
static int def_init_WIN32(CONF *conf);
static int def_destroy(CONF *conf);
static int def_destroy_data(CONF *conf);
static int def_load(CONF *conf, const char *name, long *eline);
static int def_load_bio(CONF *conf, BIO *bp, long *eline);
static int def_dump(const CONF *conf, BIO *bp);
static int def_is_number(const CONF *conf, char c);
static int def_to_int(const CONF *conf, char c);
static CONF_METHOD default_method = {
"OpenSSL default",
def_create,
def_init_default,
def_destroy,
def_destroy_data,
def_load_bio,
def_dump,
def_is_number,
def_to_int,
def_load
};
static CONF_METHOD WIN32_method = {
"WIN32",
def_create,
def_init_WIN32,
def_destroy,
def_destroy_data,
def_load_bio,
def_dump,
def_is_number,
def_to_int,
def_load
};
CONF_METHOD *NCONF_default(void)
{
return &default_method;
}
CONF_METHOD *NCONF_WIN32(void)
{
return &WIN32_method;
}
static CONF *def_create(CONF_METHOD *meth)
{
CONF *ret;
ret = OPENSSL_malloc(sizeof(*ret));
if (ret != NULL)
if (meth->init(ret) == 0) {
OPENSSL_free(ret);
ret = NULL;
}
return ret;
}
static int def_init_default(CONF *conf)
{
if (conf == NULL)
return 0;
conf->meth = &default_method;
conf->meth_data = (void *)CONF_type_default;
conf->data = NULL;
return 1;
}
static int def_init_WIN32(CONF *conf)
{
if (conf == NULL)
return 0;
conf->meth = &WIN32_method;
conf->meth_data = (void *)CONF_type_win32;
conf->data = NULL;
return 1;
}
static int def_destroy(CONF *conf)
{
if (def_destroy_data(conf)) {
OPENSSL_free(conf);
return 1;
}
return 0;
}
static int def_destroy_data(CONF *conf)
{
if (conf == NULL)
return 0;
_CONF_free_data(conf);
return 1;
}
static int def_load(CONF *conf, const char *name, long *line)
{
int ret;
BIO *in = NULL;
#ifdef OPENSSL_SYS_VMS
in = BIO_new_file(name, "r");
#else
in = BIO_new_file(name, "rb");
#endif
if (in == NULL) {
if (ERR_GET_REASON(ERR_peek_last_error()) == BIO_R_NO_SUCH_FILE)
CONFerr(CONF_F_DEF_LOAD, CONF_R_NO_SUCH_FILE);
else
CONFerr(CONF_F_DEF_LOAD, ERR_R_SYS_LIB);
return 0;
}
ret = def_load_bio(conf, in, line);
BIO_free(in);
return ret;
}
static int def_load_bio(CONF *conf, BIO *in, long *line)
{
/* The macro BUFSIZE conflicts with a system macro in VxWorks */
#define CONFBUFSIZE 512
int bufnum = 0, i, ii;
BUF_MEM *buff = NULL;
char *s, *p, *end;
int again;
long eline = 0;
char btmp[DECIMAL_SIZE(eline) + 1];
CONF_VALUE *v = NULL, *tv;
CONF_VALUE *sv = NULL;
char *section = NULL, *buf;
char *start, *psection, *pname;
void *h = (void *)(conf->data);
STACK_OF(BIO) *biosk = NULL;
#ifndef OPENSSL_NO_POSIX_IO
char *dirpath = NULL;
OPENSSL_DIR_CTX *dirctx = NULL;
#endif
if ((buff = BUF_MEM_new()) == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
goto err;
}
section = OPENSSL_strdup("default");
if (section == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
if (_CONF_new_data(conf) == 0) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
sv = _CONF_new_section(conf, section);
if (sv == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
goto err;
}
bufnum = 0;
again = 0;
for (;;) {
if (!BUF_MEM_grow(buff, bufnum + CONFBUFSIZE)) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_BUF_LIB);
goto err;
}
p = &(buff->data[bufnum]);
*p = '\0';
read_retry:
BIO_gets(in, p, CONFBUFSIZE - 1);
p[CONFBUFSIZE - 1] = '\0';
ii = i = strlen(p);
if (i == 0 && !again) {
/* the currently processed BIO is at EOF */
BIO *parent;
#ifndef OPENSSL_NO_POSIX_IO
/* continue processing with the next file from directory */
if (dirctx != NULL) {
BIO *next;
if ((next = get_next_file(dirpath, &dirctx)) != NULL) {
BIO_vfree(in);
in = next;
goto read_retry;
} else {
OPENSSL_free(dirpath);
dirpath = NULL;
}
}
#endif
/* no more files in directory, continue with processing parent */
if ((parent = sk_BIO_pop(biosk)) == NULL) {
/* everything processed get out of the loop */
break;
} else {
BIO_vfree(in);
in = parent;
goto read_retry;
}
}
again = 0;
while (i > 0) {
if ((p[i - 1] != '\r') && (p[i - 1] != '\n'))
break;
else
i--;
}
/*
* we removed some trailing stuff so there is a new line on the end.
*/
if (ii && i == ii)
again = 1; /* long line */
else {
p[i] = '\0';
eline++; /* another input line */
}
/* we now have a line with trailing \r\n removed */
/* i is the number of bytes */
bufnum += i;
v = NULL;
/* check for line continuation */
if (bufnum >= 1) {
/*
* If we have bytes and the last char '\\' and second last char
* is not '\\'
*/
p = &(buff->data[bufnum - 1]);
if (IS_ESC(conf, p[0]) && ((bufnum <= 1) || !IS_ESC(conf, p[-1]))) {
bufnum--;
again = 1;
}
}
if (again)
continue;
bufnum = 0;
buf = buff->data;
clear_comments(conf, buf);
s = eat_ws(conf, buf);
if (IS_EOF(conf, *s))
continue; /* blank line */
if (*s == '[') {
char *ss;
s++;
start = eat_ws(conf, s);
ss = start;
again:
end = eat_alpha_numeric(conf, ss);
p = eat_ws(conf, end);
if (*p != ']') {
if (*p != '\0' && ss != p) {
ss = p;
goto again;
}
CONFerr(CONF_F_DEF_LOAD_BIO,
CONF_R_MISSING_CLOSE_SQUARE_BRACKET);
goto err;
}
*end = '\0';
if (!str_copy(conf, NULL, &section, start))
goto err;
if ((sv = _CONF_get_section(conf, section)) == NULL)
sv = _CONF_new_section(conf, section);
if (sv == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO,
CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
goto err;
}
continue;
} else {
pname = s;
end = eat_alpha_numeric(conf, s);
if ((end[0] == ':') && (end[1] == ':')) {
*end = '\0';
end += 2;
psection = pname;
pname = end;
end = eat_alpha_numeric(conf, end);
} else {
psection = section;
}
p = eat_ws(conf, end);
if (strncmp(pname, ".include", 8) == 0
&& (p != pname + 8 || *p == '=')) {
char *include = NULL;
BIO *next;
if (*p == '=') {
p++;
p = eat_ws(conf, p);
}
trim_ws(conf, p);
if (!str_copy(conf, psection, &include, p))
goto err;
/* get the BIO of the included file */
#ifndef OPENSSL_NO_POSIX_IO
next = process_include(include, &dirctx, &dirpath);
if (include != dirpath) {
/* dirpath will contain include in case of a directory */
OPENSSL_free(include);
}
#else
next = BIO_new_file(include, "r");
OPENSSL_free(include);
#endif
if (next != NULL) {
/* push the currently processing BIO onto stack */
if (biosk == NULL) {
if ((biosk = sk_BIO_new_null()) == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (!sk_BIO_push(biosk, in)) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
/* continue with reading from the included BIO */
in = next;
}
continue;
} else if (*p != '=') {
CONFerr(CONF_F_DEF_LOAD_BIO, CONF_R_MISSING_EQUAL_SIGN);
goto err;
}
*end = '\0';
p++;
start = eat_ws(conf, p);
trim_ws(conf, start);
if ((v = OPENSSL_malloc(sizeof(*v))) == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
v->name = OPENSSL_strdup(pname);
v->value = NULL;
if (v->name == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!str_copy(conf, psection, &(v->value), start))
goto err;
if (strcmp(psection, section) != 0) {
if ((tv = _CONF_get_section(conf, psection))
== NULL)
tv = _CONF_new_section(conf, psection);
if (tv == NULL) {
CONFerr(CONF_F_DEF_LOAD_BIO,
CONF_R_UNABLE_TO_CREATE_NEW_SECTION);
goto err;
}
} else
tv = sv;
if (_CONF_add_string(conf, tv, v) == 0) {
CONFerr(CONF_F_DEF_LOAD_BIO, ERR_R_MALLOC_FAILURE);
goto err;
}
v = NULL;
}
}
BUF_MEM_free(buff);
OPENSSL_free(section);
/*
* No need to pop, since we only get here if the stack is empty.
* If this causes a BIO leak, THE ISSUE IS SOMEWHERE ELSE!
*/
sk_BIO_free(biosk);
return 1;
err:
BUF_MEM_free(buff);
OPENSSL_free(section);
/*
* Since |in| is the first element of the stack and should NOT be freed
* here, we cannot use sk_BIO_pop_free(). Instead, we pop and free one
* BIO at a time, making sure that the last one popped isn't.
*/
while (sk_BIO_num(biosk) > 0) {
BIO *popped = sk_BIO_pop(biosk);
BIO_vfree(in);
in = popped;
}
sk_BIO_free(biosk);
#ifndef OPENSSL_NO_POSIX_IO
OPENSSL_free(dirpath);
if (dirctx != NULL)
OPENSSL_DIR_end(&dirctx);
#endif
if (line != NULL)
*line = eline;
BIO_snprintf(btmp, sizeof(btmp), "%ld", eline);
ERR_add_error_data(2, "line ", btmp);
if (h != conf->data) {
CONF_free(conf->data);
conf->data = NULL;
}
if (v != NULL) {
OPENSSL_free(v->name);
OPENSSL_free(v->value);
OPENSSL_free(v);
}
return 0;
}
static void clear_comments(CONF *conf, char *p)
{
for (;;) {
if (IS_FCOMMENT(conf, *p)) {
*p = '\0';
return;
}
if (!IS_WS(conf, *p)) {
break;
}
p++;
}
for (;;) {
if (IS_COMMENT(conf, *p)) {
*p = '\0';
return;
}
if (IS_DQUOTE(conf, *p)) {
p = scan_dquote(conf, p);
continue;
}
if (IS_QUOTE(conf, *p)) {
p = scan_quote(conf, p);
continue;
}
if (IS_ESC(conf, *p)) {
p = scan_esc(conf, p);
continue;
}
if (IS_EOF(conf, *p))
return;
else
p++;
}
}
static int str_copy(CONF *conf, char *section, char **pto, char *from)
{
int q, r, rr = 0, to = 0, len = 0;
char *s, *e, *rp, *p, *rrp, *np, *cp, v;
BUF_MEM *buf;
if ((buf = BUF_MEM_new()) == NULL)
return 0;
len = strlen(from) + 1;
if (!BUF_MEM_grow(buf, len))
goto err;
for (;;) {
if (IS_QUOTE(conf, *from)) {
q = *from;
from++;
while (!IS_EOF(conf, *from) && (*from != q)) {
if (IS_ESC(conf, *from)) {
from++;
if (IS_EOF(conf, *from))
break;
}
buf->data[to++] = *(from++);
}
if (*from == q)
from++;
} else if (IS_DQUOTE(conf, *from)) {
q = *from;
from++;
while (!IS_EOF(conf, *from)) {
if (*from == q) {
if (*(from + 1) == q) {
from++;
} else {
break;
}
}
buf->data[to++] = *(from++);
}
if (*from == q)
from++;
} else if (IS_ESC(conf, *from)) {
from++;
v = *(from++);
if (IS_EOF(conf, v))
break;
else if (v == 'r')
v = '\r';
else if (v == 'n')
v = '\n';
else if (v == 'b')
v = '\b';
else if (v == 't')
v = '\t';
buf->data[to++] = v;
} else if (IS_EOF(conf, *from))
break;
else if (*from == '$') {
size_t newsize;
/* try to expand it */
rrp = NULL;
s = &(from[1]);
if (*s == '{')
q = '}';
else if (*s == '(')
q = ')';
else
q = 0;
if (q)
s++;
cp = section;
e = np = s;
while (IS_ALNUM(conf, *e))
e++;
if ((e[0] == ':') && (e[1] == ':')) {
cp = np;
rrp = e;
rr = *e;
*rrp = '\0';
e += 2;
np = e;
while (IS_ALNUM(conf, *e))
e++;
}
r = *e;
*e = '\0';
rp = e;
if (q) {
if (r != q) {
CONFerr(CONF_F_STR_COPY, CONF_R_NO_CLOSE_BRACE);
goto err;
}
e++;
}
/*-
* So at this point we have
* np which is the start of the name string which is
* '\0' terminated.
* cp which is the start of the section string which is
* '\0' terminated.
* e is the 'next point after'.
* r and rr are the chars replaced by the '\0'
* rp and rrp is where 'r' and 'rr' came from.
*/
p = _CONF_get_string(conf, cp, np);
if (rrp != NULL)
*rrp = rr;
*rp = r;
if (p == NULL) {
CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_HAS_NO_VALUE);
goto err;
}
newsize = strlen(p) + buf->length - (e - from);
if (newsize > MAX_CONF_VALUE_LENGTH) {
CONFerr(CONF_F_STR_COPY, CONF_R_VARIABLE_EXPANSION_TOO_LONG);
goto err;
}
if (!BUF_MEM_grow_clean(buf, newsize)) {
CONFerr(CONF_F_STR_COPY, ERR_R_MALLOC_FAILURE);
goto err;
}
while (*p)
buf->data[to++] = *(p++);
/*
* Since we change the pointer 'from', we also have to change the
* perceived length of the string it points at. /RL
*/
len -= e - from;
from = e;
/*
* In case there were no braces or parenthesis around the
* variable reference, we have to put back the character that was
* replaced with a '\0'. /RL
*/
*rp = r;
} else
buf->data[to++] = *(from++);
}
buf->data[to] = '\0';
OPENSSL_free(*pto);
*pto = buf->data;
OPENSSL_free(buf);
return 1;
err:
BUF_MEM_free(buf);
return 0;
}
#ifndef OPENSSL_NO_POSIX_IO
/*
* Check whether included path is a directory.
* Returns next BIO to process and in case of a directory
* also an opened directory context and the include path.
*/
static BIO *process_include(char *include, OPENSSL_DIR_CTX **dirctx,
char **dirpath)
{
struct stat st;
BIO *next;
if (stat(include, &st) < 0) {
SYSerr(SYS_F_STAT, errno);
ERR_add_error_data(1, include);
/* missing include file is not fatal error */
return NULL;
}
if (S_ISDIR(st.st_mode)) {
if (*dirctx != NULL) {
CONFerr(CONF_F_PROCESS_INCLUDE,
CONF_R_RECURSIVE_DIRECTORY_INCLUDE);
ERR_add_error_data(1, include);
return NULL;
}
/* a directory, load its contents */
if ((next = get_next_file(include, dirctx)) != NULL)
*dirpath = include;
return next;
}
next = BIO_new_file(include, "r");
return next;
}
/*
* Get next file from the directory path.
* Returns BIO of the next file to read and updates dirctx.
*/
static BIO *get_next_file(const char *path, OPENSSL_DIR_CTX **dirctx)
{
const char *filename;
while ((filename = OPENSSL_DIR_read(dirctx, path)) != NULL) {
size_t namelen;
namelen = strlen(filename);
if ((namelen > 5 && strcasecmp(filename + namelen - 5, ".conf") == 0)
|| (namelen > 4 && strcasecmp(filename + namelen - 4, ".cnf") == 0)) {
size_t newlen;
char *newpath;
BIO *bio;
newlen = strlen(path) + namelen + 2;
newpath = OPENSSL_zalloc(newlen);
if (newpath == NULL) {
CONFerr(CONF_F_GET_NEXT_FILE, ERR_R_MALLOC_FAILURE);
break;
}
#ifdef OPENSSL_SYS_VMS
/*
* If the given path isn't clear VMS syntax,
* we treat it as on Unix.
*/
{
size_t pathlen = strlen(path);
if (path[pathlen - 1] == ']' || path[pathlen - 1] == '>'
|| path[pathlen - 1] == ':') {
/* Clear VMS directory syntax, just copy as is */
OPENSSL_strlcpy(newpath, path, newlen);
}
}
#endif
if (newpath[0] == '\0') {
OPENSSL_strlcpy(newpath, path, newlen);
OPENSSL_strlcat(newpath, "/", newlen);
}
OPENSSL_strlcat(newpath, filename, newlen);
bio = BIO_new_file(newpath, "r");
OPENSSL_free(newpath);
/* Errors when opening files are non-fatal. */
if (bio != NULL)
return bio;
}
}
OPENSSL_DIR_end(dirctx);
*dirctx = NULL;
return NULL;
}
#endif
static int is_keytype(const CONF *conf, char c, unsigned short type)
{
const unsigned short * keytypes = (const unsigned short *) conf->meth_data;
unsigned char key = (unsigned char)c;
#ifdef CHARSET_EBCDIC
# if CHAR_BIT > 8
if (key > 255) {
/* key is out of range for os_toascii table */
return 0;
}
# endif
/* convert key from ebcdic to ascii */
key = os_toascii[key];
#endif
if (key > 127) {
/* key is not a seven bit ascii character */
return 0;
}
return (keytypes[key] & type) ? 1 : 0;
}
static char *eat_ws(CONF *conf, char *p)
{
while (IS_WS(conf, *p) && (!IS_EOF(conf, *p)))
p++;
return p;
}
static void trim_ws(CONF *conf, char *start)
{
char *p = start;
while (!IS_EOF(conf, *p))
p++;
p--;
while ((p >= start) && IS_WS(conf, *p))
p--;
p++;
*p = '\0';
}
static char *eat_alpha_numeric(CONF *conf, char *p)
{
for (;;) {
if (IS_ESC(conf, *p)) {
p = scan_esc(conf, p);
continue;
}
if (!IS_ALNUM_PUNCT(conf, *p))
return p;
p++;
}
}
static char *scan_quote(CONF *conf, char *p)
{
int q = *p;
p++;
while (!(IS_EOF(conf, *p)) && (*p != q)) {
if (IS_ESC(conf, *p)) {
p++;
if (IS_EOF(conf, *p))
return p;
}
p++;
}
if (*p == q)
p++;
return p;
}
static char *scan_dquote(CONF *conf, char *p)
{
int q = *p;
p++;
while (!(IS_EOF(conf, *p))) {
if (*p == q) {
if (*(p + 1) == q) {
p++;
} else {
break;
}
}
p++;
}
if (*p == q)
p++;
return p;
}
static void dump_value_doall_arg(const CONF_VALUE *a, BIO *out)
{
if (a->name)
BIO_printf(out, "[%s] %s=%s\n", a->section, a->name, a->value);
else
BIO_printf(out, "[[%s]]\n", a->section);
}
IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, BIO);
static int def_dump(const CONF *conf, BIO *out)
{
lh_CONF_VALUE_doall_BIO(conf->data, dump_value_doall_arg, out);
return 1;
}
static int def_is_number(const CONF *conf, char c)
{
return IS_NUMBER(conf, c);
}
static int def_to_int(const CONF *conf, char c)
{
return c - '0';
}
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