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449 lines
10 KiB
C
449 lines
10 KiB
C
/*
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* security.c: Implementation of the XSLT security framework
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*
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* See Copyright for the status of this software.
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*
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* daniel@veillard.com
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*/
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#include "precomp.h"
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#ifdef HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if defined(WIN32) && !defined(__CYGWIN__)
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#ifndef INVALID_FILE_ATTRIBUTES
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#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
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#endif
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#endif
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#ifndef HAVE_STAT
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# ifdef HAVE__STAT
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/* MS C library seems to define stat and _stat. The definition
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* is identical. Still, mapping them to each other causes a warning. */
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# ifndef _MSC_VER
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# define stat(x,y) _stat(x,y)
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# endif
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# define HAVE_STAT
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# endif
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#endif
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struct _xsltSecurityPrefs {
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xsltSecurityCheck readFile;
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xsltSecurityCheck createFile;
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xsltSecurityCheck createDir;
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xsltSecurityCheck readNet;
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xsltSecurityCheck writeNet;
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};
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static xsltSecurityPrefsPtr xsltDefaultSecurityPrefs = NULL;
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/************************************************************************
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* *
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* Module interfaces *
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* *
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************************************************************************/
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/**
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* xsltNewSecurityPrefs:
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*
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* Create a new security preference block
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*
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* Returns a pointer to the new block or NULL in case of error
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*/
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xsltSecurityPrefsPtr
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xsltNewSecurityPrefs(void) {
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xsltSecurityPrefsPtr ret;
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xsltInitGlobals();
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ret = (xsltSecurityPrefsPtr) xmlMalloc(sizeof(xsltSecurityPrefs));
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if (ret == NULL) {
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xsltTransformError(NULL, NULL, NULL,
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"xsltNewSecurityPrefs : malloc failed\n");
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return(NULL);
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}
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memset(ret, 0, sizeof(xsltSecurityPrefs));
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return(ret);
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}
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/**
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* xsltFreeSecurityPrefs:
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* @sec: the security block to free
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*
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* Free up a security preference block
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*/
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void
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xsltFreeSecurityPrefs(xsltSecurityPrefsPtr sec) {
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if (sec == NULL)
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return;
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xmlFree(sec);
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}
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/**
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* xsltSetSecurityPrefs:
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* @sec: the security block to update
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* @option: the option to update
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* @func: the user callback to use for this option
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*
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* Update the security option to use the new callback checking function
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*
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* Returns -1 in case of error, 0 otherwise
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*/
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int
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xsltSetSecurityPrefs(xsltSecurityPrefsPtr sec, xsltSecurityOption option,
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xsltSecurityCheck func) {
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xsltInitGlobals();
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if (sec == NULL)
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return(-1);
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switch (option) {
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case XSLT_SECPREF_READ_FILE:
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sec->readFile = func; return(0);
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case XSLT_SECPREF_WRITE_FILE:
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sec->createFile = func; return(0);
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case XSLT_SECPREF_CREATE_DIRECTORY:
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sec->createDir = func; return(0);
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case XSLT_SECPREF_READ_NETWORK:
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sec->readNet = func; return(0);
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case XSLT_SECPREF_WRITE_NETWORK:
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sec->writeNet = func; return(0);
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}
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return(-1);
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}
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/**
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* xsltGetSecurityPrefs:
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* @sec: the security block to update
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* @option: the option to lookup
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*
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* Lookup the security option to get the callback checking function
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*
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* Returns NULL if not found, the function otherwise
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*/
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xsltSecurityCheck
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xsltGetSecurityPrefs(xsltSecurityPrefsPtr sec, xsltSecurityOption option) {
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if (sec == NULL)
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return(NULL);
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switch (option) {
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case XSLT_SECPREF_READ_FILE:
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return(sec->readFile);
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case XSLT_SECPREF_WRITE_FILE:
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return(sec->createFile);
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case XSLT_SECPREF_CREATE_DIRECTORY:
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return(sec->createDir);
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case XSLT_SECPREF_READ_NETWORK:
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return(sec->readNet);
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case XSLT_SECPREF_WRITE_NETWORK:
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return(sec->writeNet);
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}
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return(NULL);
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}
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/**
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* xsltSetDefaultSecurityPrefs:
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* @sec: the security block to use
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*
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* Set the default security preference application-wide
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*/
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void
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xsltSetDefaultSecurityPrefs(xsltSecurityPrefsPtr sec) {
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xsltDefaultSecurityPrefs = sec;
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}
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/**
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* xsltGetDefaultSecurityPrefs:
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*
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* Get the default security preference application-wide
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*
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* Returns the current xsltSecurityPrefsPtr in use or NULL if none
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*/
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xsltSecurityPrefsPtr
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xsltGetDefaultSecurityPrefs(void) {
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return(xsltDefaultSecurityPrefs);
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}
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/**
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* xsltSetCtxtSecurityPrefs:
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* @sec: the security block to use
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* @ctxt: an XSLT transformation context
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*
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* Set the security preference for a specific transformation
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*
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* Returns -1 in case of error, 0 otherwise
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*/
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int
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xsltSetCtxtSecurityPrefs(xsltSecurityPrefsPtr sec,
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xsltTransformContextPtr ctxt) {
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if (ctxt == NULL)
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return(-1);
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ctxt->sec = (void *) sec;
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return(0);
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}
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/**
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* xsltSecurityAllow:
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* @sec: the security block to use
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* @ctxt: an XSLT transformation context
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* @value: unused
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*
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* Function used to always allow an operation
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*
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* Returns 1 always
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*/
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int
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xsltSecurityAllow(xsltSecurityPrefsPtr sec ATTRIBUTE_UNUSED,
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xsltTransformContextPtr ctxt ATTRIBUTE_UNUSED,
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const char *value ATTRIBUTE_UNUSED) {
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return(1);
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}
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/**
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* xsltSecurityForbid:
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* @sec: the security block to use
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* @ctxt: an XSLT transformation context
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* @value: unused
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*
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* Function used to always forbid an operation
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*
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* Returns 0 always
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*/
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int
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xsltSecurityForbid(xsltSecurityPrefsPtr sec ATTRIBUTE_UNUSED,
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xsltTransformContextPtr ctxt ATTRIBUTE_UNUSED,
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const char *value ATTRIBUTE_UNUSED) {
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return(0);
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}
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/************************************************************************
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* *
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* Internal interfaces *
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* *
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************************************************************************/
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/**
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* xsltCheckFilename
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* @path: the path to check
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*
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* function checks to see if @path is a valid source
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* (file, socket...) for XML.
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*
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* TODO: remove at some point !!!
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* Local copy of xmlCheckFilename to avoid a hard dependency on
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* a new version of libxml2
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*
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* if stat is not available on the target machine,
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* returns 1. if stat fails, returns 0 (if calling
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* stat on the filename fails, it can't be right).
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* if stat succeeds and the file is a directory,
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* returns 2. otherwise returns 1.
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*/
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static int
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xsltCheckFilename (const char *path)
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{
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#ifdef HAVE_STAT
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struct stat stat_buffer;
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#if defined(_WIN32) && !defined(__CYGWIN__)
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DWORD dwAttrs;
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dwAttrs = GetFileAttributes(path);
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if (dwAttrs != INVALID_FILE_ATTRIBUTES) {
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if (dwAttrs & FILE_ATTRIBUTE_DIRECTORY) {
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return 2;
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}
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}
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#endif
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if (stat(path, &stat_buffer) == -1)
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return 0;
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#ifdef S_ISDIR
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if (S_ISDIR(stat_buffer.st_mode)) {
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return 2;
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}
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#endif
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#endif
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return 1;
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}
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static int
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xsltCheckWritePath(xsltSecurityPrefsPtr sec,
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xsltTransformContextPtr ctxt,
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const char *path)
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{
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int ret;
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xsltSecurityCheck check;
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char *directory;
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check = xsltGetSecurityPrefs(sec, XSLT_SECPREF_WRITE_FILE);
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if (check != NULL) {
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ret = check(sec, ctxt, path);
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if (ret == 0) {
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xsltTransformError(ctxt, NULL, NULL,
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"File write for %s refused\n", path);
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return(0);
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}
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}
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directory = xmlParserGetDirectory (path);
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if (directory != NULL) {
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ret = xsltCheckFilename(directory);
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if (ret == 0) {
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/*
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* The directory doesn't exist check for creation
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*/
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check = xsltGetSecurityPrefs(sec,
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XSLT_SECPREF_CREATE_DIRECTORY);
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if (check != NULL) {
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ret = check(sec, ctxt, directory);
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if (ret == 0) {
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xsltTransformError(ctxt, NULL, NULL,
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"Directory creation for %s refused\n",
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path);
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xmlFree(directory);
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return(0);
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}
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}
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ret = xsltCheckWritePath(sec, ctxt, directory);
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if (ret == 1)
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ret = mkdir(directory, 0755);
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}
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xmlFree(directory);
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if (ret < 0)
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return(ret);
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}
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return(1);
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}
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/**
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* xsltCheckWrite:
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* @sec: the security options
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* @ctxt: an XSLT transformation context
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* @URL: the resource to be written
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*
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* Check if the resource is allowed to be written, if necessary makes
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* some preliminary work like creating directories
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*
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* Return 1 if write is allowed, 0 if not and -1 in case or error.
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*/
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int
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xsltCheckWrite(xsltSecurityPrefsPtr sec,
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xsltTransformContextPtr ctxt, const xmlChar *URL) {
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int ret;
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xmlURIPtr uri;
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xsltSecurityCheck check;
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uri = xmlParseURI((const char *)URL);
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if (uri == NULL) {
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uri = xmlCreateURI();
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if (uri == NULL) {
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xsltTransformError(ctxt, NULL, NULL,
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"xsltCheckWrite: out of memory for %s\n", URL);
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return(-1);
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}
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uri->path = (char *)xmlStrdup(URL);
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}
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if ((uri->scheme == NULL) ||
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(xmlStrEqual(BAD_CAST uri->scheme, BAD_CAST "file"))) {
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#if defined(_WIN32) && !defined(__CYGWIN__)
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if ((uri->path)&&(uri->path[0]=='/')&&
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(uri->path[1]!='\0')&&(uri->path[2]==':'))
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ret = xsltCheckWritePath(sec, ctxt, uri->path+1);
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else
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#endif
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{
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/*
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* Check if we are allowed to write this file
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*/
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ret = xsltCheckWritePath(sec, ctxt, uri->path);
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}
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if (ret <= 0) {
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xmlFreeURI(uri);
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return(ret);
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}
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} else {
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/*
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* Check if we are allowed to write this network resource
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*/
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check = xsltGetSecurityPrefs(sec, XSLT_SECPREF_WRITE_NETWORK);
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if (check != NULL) {
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ret = check(sec, ctxt, (const char *)URL);
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if (ret == 0) {
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xsltTransformError(ctxt, NULL, NULL,
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"File write for %s refused\n", URL);
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xmlFreeURI(uri);
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return(0);
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}
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}
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}
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xmlFreeURI(uri);
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return(1);
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}
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/**
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* xsltCheckRead:
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* @sec: the security options
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* @ctxt: an XSLT transformation context
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* @URL: the resource to be read
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*
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* Check if the resource is allowed to be read
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*
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* Return 1 if read is allowed, 0 if not and -1 in case or error.
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*/
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int
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xsltCheckRead(xsltSecurityPrefsPtr sec,
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xsltTransformContextPtr ctxt, const xmlChar *URL) {
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int ret;
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xmlURIPtr uri;
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xsltSecurityCheck check;
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uri = xmlParseURI((const char *)URL);
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if (uri == NULL) {
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xsltTransformError(ctxt, NULL, NULL,
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"xsltCheckRead: URL parsing failed for %s\n",
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URL);
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return(-1);
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}
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if ((uri->scheme == NULL) ||
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(xmlStrEqual(BAD_CAST uri->scheme, BAD_CAST "file"))) {
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/*
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* Check if we are allowed to read this file
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*/
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check = xsltGetSecurityPrefs(sec, XSLT_SECPREF_READ_FILE);
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if (check != NULL) {
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ret = check(sec, ctxt, uri->path);
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if (ret == 0) {
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xsltTransformError(ctxt, NULL, NULL,
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"Local file read for %s refused\n", URL);
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xmlFreeURI(uri);
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return(0);
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}
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}
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} else {
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/*
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* Check if we are allowed to write this network resource
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*/
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check = xsltGetSecurityPrefs(sec, XSLT_SECPREF_READ_NETWORK);
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if (check != NULL) {
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ret = check(sec, ctxt, (const char *)URL);
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if (ret == 0) {
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xsltTransformError(ctxt, NULL, NULL,
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"Network file read for %s refused\n", URL);
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xmlFreeURI(uri);
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return(0);
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}
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}
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}
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xmlFreeURI(uri);
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return(1);
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}
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