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xml.c
6066 lines (4929 loc) · 173 KB
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xml.c
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/*
* Copyright (C) 2004 Andrew Beekhof <andrew@beekhof.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <crm_internal.h>
#include <sys/param.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <time.h>
#include <string.h>
#include <dirent.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#include <math.h>
#include <crm/crm.h>
#include <crm/msg_xml.h>
#include <crm/common/xml.h>
#include <libxml/xmlreader.h>
#if HAVE_BZLIB_H
# include <bzlib.h>
#endif
#if HAVE_LIBXML2
# include <libxml/parser.h>
# include <libxml/tree.h>
# include <libxml/relaxng.h>
#endif
#if HAVE_LIBXSLT
# include <libxslt/xslt.h>
# include <libxslt/transform.h>
#endif
#define XML_BUFFER_SIZE 4096
#define XML_PARSER_DEBUG 0
#define BEST_EFFORT_STATUS 0
void
xml_log(int priority, const char *fmt, ...)
G_GNUC_PRINTF(2, 3);
static inline int
__get_prefix(const char *prefix, xmlNode *xml, char *buffer, int offset);
void
xml_log(int priority, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
qb_log_from_external_source_va(__FUNCTION__, __FILE__, fmt, priority, __LINE__, 0, ap);
va_end(ap);
}
typedef struct {
xmlRelaxNGPtr rng;
xmlRelaxNGValidCtxtPtr valid;
xmlRelaxNGParserCtxtPtr parser;
} relaxng_ctx_cache_t;
struct schema_s {
int type;
float version;
char *name;
char *location;
char *transform;
int after_transform;
void *cache;
};
typedef struct {
int found;
const char *string;
} filter_t;
enum xml_private_flags {
xpf_none = 0x0000,
xpf_dirty = 0x0001,
xpf_deleted = 0x0002,
xpf_created = 0x0004,
xpf_modified = 0x0008,
xpf_tracking = 0x0010,
xpf_processed = 0x0020,
xpf_skip = 0x0040,
xpf_moved = 0x0080,
xpf_acl_enabled = 0x0100,
xpf_acl_read = 0x0200,
xpf_acl_write = 0x0400,
xpf_acl_deny = 0x0800,
xpf_acl_create = 0x1000,
xpf_acl_denied = 0x2000,
};
typedef struct xml_private_s
{
long check;
uint32_t flags;
char *user;
GListPtr acls;
GListPtr deleted_paths;
} xml_private_t;
typedef struct xml_acl_s {
enum xml_private_flags mode;
char *xpath;
} xml_acl_t;
/* *INDENT-OFF* */
static filter_t filter[] = {
{ 0, XML_ATTR_ORIGIN },
{ 0, XML_CIB_ATTR_WRITTEN },
{ 0, XML_ATTR_UPDATE_ORIG },
{ 0, XML_ATTR_UPDATE_CLIENT },
{ 0, XML_ATTR_UPDATE_USER },
};
/* *INDENT-ON* */
static struct schema_s *known_schemas = NULL;
static int xml_schema_max = 0;
static xmlNode *subtract_xml_comment(xmlNode * parent, xmlNode * left, xmlNode * right, gboolean * changed);
static xmlNode *find_xml_comment(xmlNode * root, xmlNode * search_comment);
static int add_xml_comment(xmlNode * parent, xmlNode * target, xmlNode * update);
static bool __xml_acl_check(xmlNode *xml, const char *name, enum xml_private_flags mode);
const char *__xml_acl_to_text(enum xml_private_flags flags);
static int
xml_latest_schema_index(void)
{
return xml_schema_max - 4;
}
static int
xml_minimum_schema_index(void)
{
static int best = 0;
if(best == 0) {
int lpc = 0;
float target = 0.0;
best = xml_latest_schema_index();
target = floor(known_schemas[best].version);
for(lpc = best; lpc > 0; lpc--) {
if(known_schemas[lpc].version < target) {
return best;
} else {
best = lpc;
}
}
best = xml_latest_schema_index();
}
return best;
}
const char *
xml_latest_schema(void)
{
return get_schema_name(xml_latest_schema_index());
}
#define CHUNK_SIZE 1024
static inline bool TRACKING_CHANGES(xmlNode *xml)
{
if(xml == NULL || xml->doc == NULL || xml->doc->_private == NULL) {
return FALSE;
} else if(is_set(((xml_private_t *)xml->doc->_private)->flags, xpf_tracking)) {
return TRUE;
}
return FALSE;
}
#define buffer_print(buffer, max, offset, fmt, args...) do { \
int rc = (max); \
if(buffer) { \
rc = snprintf((buffer) + (offset), (max) - (offset), fmt, ##args); \
} \
if(buffer && rc < 0) { \
crm_perror(LOG_ERR, "snprintf failed at offset %d", offset); \
(buffer)[(offset)] = 0; \
} else if(rc >= ((max) - (offset))) { \
char *tmp = NULL; \
(max) = QB_MAX(CHUNK_SIZE, (max) * 2); \
tmp = realloc((buffer), (max) + 1); \
CRM_ASSERT(tmp); \
(buffer) = tmp; \
} else { \
offset += rc; \
break; \
} \
} while(1);
static void
insert_prefix(int options, char **buffer, int *offset, int *max, int depth)
{
if (options & xml_log_option_formatted) {
size_t spaces = 2 * depth;
if ((*buffer) == NULL || spaces >= ((*max) - (*offset))) {
(*max) = QB_MAX(CHUNK_SIZE, (*max) * 2);
(*buffer) = realloc((*buffer), (*max) + 1);
}
memset((*buffer) + (*offset), ' ', spaces);
(*offset) += spaces;
}
}
static const char *
get_schema_root(void)
{
static const char *base = NULL;
if (base == NULL) {
base = getenv("PCMK_schema_directory");
}
if (base == NULL || strlen(base) == 0) {
base = CRM_DTD_DIRECTORY;
}
return base;
}
static char *
get_schema_path(const char *name, const char *file)
{
const char *base = get_schema_root();
if(file) {
return g_strdup_printf("%s/%s", base, file);
}
return g_strdup_printf("%s/%s.rng", base, name);
}
static int schema_filter(const struct dirent * a)
{
int rc = 0;
float version = 0;
if(strstr(a->d_name, "pacemaker-") != a->d_name) {
/* crm_trace("%s - wrong prefix", a->d_name); */
} else if(strstr(a->d_name, ".rng") == NULL) {
/* crm_trace("%s - wrong suffix", a->d_name); */
} else if(sscanf(a->d_name, "pacemaker-%f.rng", &version) == 0) {
/* crm_trace("%s - wrong format", a->d_name); */
} else if(strcmp(a->d_name, "pacemaker-1.1.rng") == 0) {
/* crm_trace("%s - hack", a->d_name); */
} else {
/* crm_debug("%s - candidate", a->d_name); */
rc = 1;
}
return rc;
}
static int schema_sort(const struct dirent ** a, const struct dirent **b)
{
int rc = 0;
float a_version = 0.0;
float b_version = 0.0;
sscanf(a[0]->d_name, "pacemaker-%f.rng", &a_version);
sscanf(b[0]->d_name, "pacemaker-%f.rng", &b_version);
if(a_version > b_version) {
rc = 1;
} else if(a_version < b_version) {
rc = -1;
}
/* crm_trace("%s (%f) vs. %s (%f) : %d", a[0]->d_name, a_version, b[0]->d_name, b_version, rc); */
return rc;
}
static void __xml_schema_add(
int type, float version, const char *name, const char *location, const char *transform, int after_transform)
{
int last = xml_schema_max;
xml_schema_max++;
known_schemas = realloc(known_schemas, xml_schema_max*sizeof(struct schema_s));
CRM_ASSERT(known_schemas != NULL);
memset(known_schemas+last, 0, sizeof(struct schema_s));
known_schemas[last].type = type;
known_schemas[last].after_transform = after_transform;
if(version > 0.0) {
known_schemas[last].version = version;
known_schemas[last].name = g_strdup_printf("pacemaker-%.1f", version);
known_schemas[last].location = g_strdup_printf("%s.rng", known_schemas[last].name);
} else {
char dummy[1024];
CRM_ASSERT(name);
CRM_ASSERT(location);
sscanf(name, "%[^-]-%f", dummy, &version);
known_schemas[last].version = version;
known_schemas[last].name = strdup(name);
known_schemas[last].location = strdup(location);
}
if(transform) {
known_schemas[last].transform = strdup(transform);
}
if(after_transform == 0) {
after_transform = xml_schema_max;
}
known_schemas[last].after_transform = after_transform;
if(known_schemas[last].after_transform < 0) {
crm_debug("Added supported schema %d: %s (%s)",
last, known_schemas[last].name, known_schemas[last].location);
} else if(known_schemas[last].transform) {
crm_debug("Added supported schema %d: %s (%s upgrades to %d with %s)",
last, known_schemas[last].name, known_schemas[last].location,
known_schemas[last].after_transform,
known_schemas[last].transform);
} else {
crm_debug("Added supported schema %d: %s (%s upgrades to %d)",
last, known_schemas[last].name, known_schemas[last].location,
known_schemas[last].after_transform);
}
}
static int __xml_build_schema_list(void)
{
int lpc, max;
const char *base = get_schema_root();
struct dirent **namelist = NULL;
max = scandir(base, &namelist, schema_filter, schema_sort);
__xml_schema_add(1, 0.0, "pacemaker-0.6", "crm.dtd", "upgrade06.xsl", 3);
__xml_schema_add(1, 0.0, "transitional-0.6", "crm-transitional.dtd", "upgrade06.xsl", 3);
__xml_schema_add(2, 0.0, "pacemaker-0.7", "pacemaker-1.0.rng", NULL, 0);
if (max < 0) {
crm_notice("scandir(%s) failed: %s (%d)", base, strerror(errno), errno);
} else {
for (lpc = 0; lpc < max; lpc++) {
int next = 0;
float version = 0.0;
char *transform = NULL;
sscanf(namelist[lpc]->d_name, "pacemaker-%f.rng", &version);
if((lpc + 1) < max) {
float next_version = 0.0;
sscanf(namelist[lpc+1]->d_name, "pacemaker-%f.rng", &next_version);
if(floor(version) < floor(next_version)) {
struct stat s;
char *xslt = NULL;
transform = g_strdup_printf("upgrade-%.1f.xsl", version);
xslt = get_schema_path(NULL, transform);
if(stat(xslt, &s) != 0) {
crm_err("Transform %s not found", xslt);
free(xslt);
__xml_schema_add(2, version, NULL, NULL, NULL, -1);
break;
} else {
free(xslt);
}
}
} else {
next = -1;
}
__xml_schema_add(2, version, NULL, NULL, transform, next);
free(namelist[lpc]);
free(transform);
}
}
/* 1.1 was the old name for -next */
__xml_schema_add(2, 0.0, "pacemaker-1.1", "pacemaker-next.rng", NULL, 0);
__xml_schema_add(2, 0.0, "pacemaker-next", "pacemaker-next.rng", NULL, -1);
__xml_schema_add(0, 0.0, "none", "N/A", NULL, -1);
free(namelist);
return TRUE;
}
static void
set_parent_flag(xmlNode *xml, long flag)
{
for(; xml; xml = xml->parent) {
xml_private_t *p = xml->_private;
if(p == NULL) {
/* During calls to xmlDocCopyNode(), _private will be unset for parent nodes */
} else {
p->flags |= flag;
/* crm_trace("Setting flag %x due to %s[@id=%s]", flag, xml->name, ID(xml)); */
}
}
}
static void
set_doc_flag(xmlNode *xml, long flag)
{
if(xml && xml->doc && xml->doc->_private){
/* During calls to xmlDocCopyNode(), xml->doc may be unset */
xml_private_t *p = xml->doc->_private;
p->flags |= flag;
/* crm_trace("Setting flag %x due to %s[@id=%s]", flag, xml->name, ID(xml)); */
}
}
static void
__xml_node_dirty(xmlNode *xml)
{
set_doc_flag(xml, xpf_dirty);
set_parent_flag(xml, xpf_dirty);
}
static void
__xml_node_clean(xmlNode *xml)
{
xmlNode *cIter = NULL;
xml_private_t *p = xml->_private;
if(p) {
p->flags = 0;
}
for (cIter = __xml_first_child(xml); cIter != NULL; cIter = __xml_next(cIter)) {
__xml_node_clean(cIter);
}
}
static void
crm_node_created(xmlNode *xml)
{
xmlNode *cIter = NULL;
xml_private_t *p = xml->_private;
if(p && TRACKING_CHANGES(xml)) {
if(is_not_set(p->flags, xpf_created)) {
p->flags |= xpf_created;
__xml_node_dirty(xml);
}
for (cIter = __xml_first_child(xml); cIter != NULL; cIter = __xml_next(cIter)) {
crm_node_created(cIter);
}
}
}
static void
crm_attr_dirty(xmlAttr *a)
{
xmlNode *parent = a->parent;
xml_private_t *p = NULL;
p = a->_private;
p->flags |= (xpf_dirty|xpf_modified);
p->flags = (p->flags & ~xpf_deleted);
/* crm_trace("Setting flag %x due to %s[@id=%s, @%s=%s]", */
/* xpf_dirty, parent?parent->name:NULL, ID(parent), a->name, a->children->content); */
__xml_node_dirty(parent);
}
int get_tag_name(const char *input, size_t offset, size_t max);
int get_attr_name(const char *input, size_t offset, size_t max);
int get_attr_value(const char *input, size_t offset, size_t max);
gboolean can_prune_leaf(xmlNode * xml_node);
void diff_filter_context(int context, int upper_bound, int lower_bound,
xmlNode * xml_node, xmlNode * parent);
int in_upper_context(int depth, int context, xmlNode * xml_node);
int add_xml_object(xmlNode * parent, xmlNode * target, xmlNode * update, gboolean as_diff);
static inline const char *
crm_attr_value(xmlAttr * attr)
{
if (attr == NULL || attr->children == NULL) {
return NULL;
}
return (const char *)attr->children->content;
}
static inline xmlAttr *
crm_first_attr(xmlNode * xml)
{
if (xml == NULL) {
return NULL;
}
return xml->properties;
}
#define XML_PRIVATE_MAGIC (long) 0x81726354
static void
__xml_acl_free(void *data)
{
if(data) {
xml_acl_t *acl = data;
free(acl->xpath);
free(acl);
}
}
static void
__xml_private_clean(xml_private_t *p)
{
if(p) {
CRM_ASSERT(p->check == XML_PRIVATE_MAGIC);
free(p->user);
p->user = NULL;
if(p->acls) {
g_list_free_full(p->acls, __xml_acl_free);
p->acls = NULL;
}
if(p->deleted_paths) {
g_list_free_full(p->deleted_paths, free);
p->deleted_paths = NULL;
}
}
}
static void
__xml_private_free(xml_private_t *p)
{
__xml_private_clean(p);
free(p);
}
static void
pcmkDeregisterNode(xmlNodePtr node)
{
__xml_private_free(node->_private);
}
static void
pcmkRegisterNode(xmlNodePtr node)
{
xml_private_t *p = NULL;
switch(node->type) {
case XML_ELEMENT_NODE:
case XML_DOCUMENT_NODE:
case XML_ATTRIBUTE_NODE:
case XML_COMMENT_NODE:
p = calloc(1, sizeof(xml_private_t));
p->check = XML_PRIVATE_MAGIC;
/* Flags will be reset if necessary when tracking is enabled */
p->flags |= (xpf_dirty|xpf_created);
node->_private = p;
break;
case XML_TEXT_NODE:
case XML_DTD_NODE:
break;
default:
/* Ignore */
crm_trace("Ignoring %p %d", node, node->type);
CRM_LOG_ASSERT(node->type == XML_ELEMENT_NODE);
break;
}
if(p && TRACKING_CHANGES(node)) {
/* XML_ELEMENT_NODE doesn't get picked up here, node->doc is
* not hooked up at the point we are called
*/
set_doc_flag(node, xpf_dirty);
__xml_node_dirty(node);
}
}
static xml_acl_t *
__xml_acl_create(xmlNode * xml, xmlNode *target, enum xml_private_flags mode)
{
xml_acl_t *acl = NULL;
xml_private_t *p = NULL;
const char *tag = crm_element_value(xml, XML_ACL_ATTR_TAG);
const char *ref = crm_element_value(xml, XML_ACL_ATTR_REF);
const char *xpath = crm_element_value(xml, XML_ACL_ATTR_XPATH);
if(tag == NULL) {
/* Compatability handling for pacemaker < 1.1.12 */
tag = crm_element_value(xml, XML_ACL_ATTR_TAGv1);
}
if(ref == NULL) {
/* Compatability handling for pacemaker < 1.1.12 */
ref = crm_element_value(xml, XML_ACL_ATTR_REFv1);
}
if(target == NULL || target->doc == NULL || target->doc->_private == NULL){
CRM_ASSERT(target);
CRM_ASSERT(target->doc);
CRM_ASSERT(target->doc->_private);
return NULL;
} else if (tag == NULL && ref == NULL && xpath == NULL) {
crm_trace("No criteria %p", xml);
return NULL;
}
p = target->doc->_private;
acl = calloc(1, sizeof(xml_acl_t));
if (acl) {
const char *attr = crm_element_value(xml, XML_ACL_ATTR_ATTRIBUTE);
acl->mode = mode;
if(xpath) {
acl->xpath = strdup(xpath);
crm_trace("Using xpath: %s", acl->xpath);
} else {
int offset = 0;
char buffer[XML_BUFFER_SIZE];
if(tag) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "//%s", tag);
} else {
/* Is this even legal xpath syntax? */
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "*");
}
if(ref || attr) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "[");
}
if(ref) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "@id='%s'", ref);
}
if(ref && attr) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, " and ");
}
if(attr) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "@%s", attr);
}
if(ref || attr) {
offset += snprintf(buffer + offset, XML_BUFFER_SIZE - offset, "]");
}
CRM_LOG_ASSERT(offset > 0);
acl->xpath = strdup(buffer);
crm_trace("Built xpath: %s", acl->xpath);
}
p->acls = g_list_append(p->acls, acl);
}
return acl;
}
static gboolean
__xml_acl_parse_entry(xmlNode * acl_top, xmlNode * acl_entry, xmlNode *target)
{
xmlNode *child = NULL;
for (child = __xml_first_child(acl_entry); child; child = __xml_next(child)) {
const char *tag = crm_element_name(child);
const char *kind = crm_element_value(child, XML_ACL_ATTR_KIND);
if (strcmp(XML_ACL_TAG_PERMISSION, tag) == 0){
tag = kind;
}
crm_trace("Processing %s %p", tag, child);
if(tag == NULL) {
CRM_ASSERT(tag != NULL);
} else if (strcmp(XML_ACL_TAG_ROLE_REF, tag) == 0
|| strcmp(XML_ACL_TAG_ROLE_REFv1, tag) == 0) {
const char *ref_role = crm_element_value(child, XML_ATTR_ID);
if (ref_role) {
xmlNode *role = NULL;
for (role = __xml_first_child(acl_top); role; role = __xml_next(role)) {
if (strcmp(XML_ACL_TAG_ROLE, (const char *)role->name) == 0) {
const char *role_id = crm_element_value(role, XML_ATTR_ID);
if (role_id && strcmp(ref_role, role_id) == 0) {
crm_debug("Unpacking referenced role: %s", role_id);
__xml_acl_parse_entry(acl_top, role, target);
break;
}
}
}
}
} else if (strcmp(XML_ACL_TAG_READ, tag) == 0) {
__xml_acl_create(child, target, xpf_acl_read);
} else if (strcmp(XML_ACL_TAG_WRITE, tag) == 0) {
__xml_acl_create(child, target, xpf_acl_write);
} else if (strcmp(XML_ACL_TAG_DENY, tag) == 0) {
__xml_acl_create(child, target, xpf_acl_deny);
} else {
crm_warn("Unknown ACL entry: %s/%s", tag, kind);
}
}
return TRUE;
}
/*
<acls>
<acl_target id="l33t-haxor"><role id="auto-l33t-haxor"/></acl_target>
<acl_role id="auto-l33t-haxor">
<acl_permission id="crook-nothing" kind="deny" xpath="/cib"/>
</acl_role>
<acl_target id="niceguy">
<role id="observer"/>
</acl_target>
<acl_role id="observer">
<acl_permission id="observer-read-1" kind="read" xpath="/cib"/>
<acl_permission id="observer-write-1" kind="write" xpath="//nvpair[@name='stonith-enabled']"/>
<acl_permission id="observer-write-2" kind="write" xpath="//nvpair[@name='target-role']"/>
</acl_role>
<acl_target id="badidea"><role id="auto-badidea"/></acl_target>
<acl_role id="auto-badidea">
<acl_permission id="badidea-resources" kind="read" xpath="//meta_attributes"/>
<acl_permission id="badidea-resources-2" kind="deny" reference="dummy-meta_attributes"/>
</acl_role>
</acls>
*/
const char *
__xml_acl_to_text(enum xml_private_flags flags)
{
if(is_set(flags, xpf_acl_deny)) {
return "deny";
}
if(is_set(flags, xpf_acl_write)) {
return "read/write";
}
if(is_set(flags, xpf_acl_read)) {
return "read";
}
return "none";
}
static void
__xml_acl_apply(xmlNode *xml)
{
GListPtr aIter = NULL;
xml_private_t *p = NULL;
xmlXPathObjectPtr xpathObj = NULL;
if(xml_acl_enabled(xml) == FALSE) {
p = xml->doc->_private;
crm_trace("Not applying ACLs for %s", p->user);
return;
}
p = xml->doc->_private;
for(aIter = p->acls; aIter != NULL; aIter = aIter->next) {
int max = 0, lpc = 0;
xml_acl_t *acl = aIter->data;
xpathObj = xpath_search(xml, acl->xpath);
max = numXpathResults(xpathObj);
for(lpc = 0; lpc < max; lpc++) {
xmlNode *match = getXpathResult(xpathObj, lpc);
char *path = xml_get_path(match);
p = match->_private;
crm_trace("Applying %x to %s for %s", acl->mode, path, acl->xpath);
#ifdef SUSE_ACL_COMPAT
if(is_not_set(p->flags, acl->mode)) {
if(is_set(p->flags, xpf_acl_read)
|| is_set(p->flags, xpf_acl_write)
|| is_set(p->flags, xpf_acl_deny)) {
crm_config_warn("Configuration element %s is matched by multiple ACL rules, only the first applies ('%s' wins over '%s')",
path, __xml_acl_to_text(p->flags), __xml_acl_to_text(acl->mode));
free(path);
continue;
}
}
#endif
p->flags |= acl->mode;
free(path);
}
crm_trace("Now enforcing ACL: %s (%d matches)", acl->xpath, max);
freeXpathObject(xpathObj);
}
p = xml->_private;
if(is_not_set(p->flags, xpf_acl_read) && is_not_set(p->flags, xpf_acl_write)) {
p->flags |= xpf_acl_deny;
p = xml->doc->_private;
crm_info("Enforcing default ACL for %s to %s", p->user, crm_element_name(xml));
}
}
static void
__xml_acl_unpack(xmlNode *source, xmlNode *target, const char *user)
{
#if ENABLE_ACL
xml_private_t *p = NULL;
if(target == NULL || target->doc == NULL || target->doc->_private == NULL) {
return;
}
p = target->doc->_private;
if(pcmk_acl_required(user) == FALSE) {
crm_trace("no acls needed for '%s'", user);
} else if(p->acls == NULL) {
xmlNode *acls = get_xpath_object("//"XML_CIB_TAG_ACLS, source, LOG_TRACE);
free(p->user);
p->user = strdup(user);
if(acls) {
xmlNode *child = NULL;
for (child = __xml_first_child(acls); child; child = __xml_next(child)) {
const char *tag = crm_element_name(child);
if (strcmp(tag, XML_ACL_TAG_USER) == 0 || strcmp(tag, XML_ACL_TAG_USERv1) == 0) {
const char *id = crm_element_value(child, XML_ATTR_ID);
if(id && strcmp(id, user) == 0) {
crm_debug("Unpacking ACLs for %s", id);
__xml_acl_parse_entry(acls, child, target);
}
}
}
}
}
#endif
}
static inline bool
__xml_acl_mode_test(enum xml_private_flags allowed, enum xml_private_flags requested)
{
if(is_set(allowed, xpf_acl_deny)) {
return FALSE;
} else if(is_set(allowed, requested)) {
return TRUE;
} else if(is_set(requested, xpf_acl_read) && is_set(allowed, xpf_acl_write)) {
return TRUE;
} else if(is_set(requested, xpf_acl_create) && is_set(allowed, xpf_acl_write)) {
return TRUE;
} else if(is_set(requested, xpf_acl_create) && is_set(allowed, xpf_created)) {
return TRUE;
}
return FALSE;
}
/* rc = TRUE if orig_cib has been filtered
* That means '*result' rather than 'xml' should be exploited afterwards
*/
static bool
__xml_purge_attributes(xmlNode *xml)
{
xmlNode *child = NULL;
xmlAttr *xIter = NULL;
bool readable_children = FALSE;
xml_private_t *p = xml->_private;
if(__xml_acl_mode_test(p->flags, xpf_acl_read)) {
crm_trace("%s is readable", crm_element_name(xml), ID(xml));
return TRUE;
}
xIter = crm_first_attr(xml);
while(xIter != NULL) {
xmlAttr *tmp = xIter;
const char *prop_name = (const char *)xIter->name;
xIter = xIter->next;
if (strcmp(prop_name, XML_ATTR_ID) == 0) {
continue;
}
xmlUnsetProp(xml, tmp->name);
}
child = __xml_first_child(xml);
while ( child != NULL ) {
xmlNode *tmp = child;
child = __xml_next(child);
readable_children |= __xml_purge_attributes(tmp);
}
if(readable_children == FALSE) {
free_xml(xml); /* Nothing readable under here, purge completely */
}
return readable_children;
}
bool
xml_acl_filtered_copy(const char *user, xmlNode* acl_source, xmlNode *xml, xmlNode ** result)
{
GListPtr aIter = NULL;
xmlNode *target = NULL;
xml_private_t *p = NULL;
xml_private_t *doc = NULL;
*result = NULL;
if(xml == NULL || pcmk_acl_required(user) == FALSE) {
crm_trace("no acls needed for '%s'", user);
return FALSE;
}
crm_trace("filtering copy of %p for '%s'", xml, user);
target = copy_xml(xml);
if(target == NULL) {
return TRUE;
}
__xml_acl_unpack(acl_source, target, user);
set_doc_flag(target, xpf_acl_enabled);
__xml_acl_apply(target);
doc = target->doc->_private;
for(aIter = doc->acls; aIter != NULL && target; aIter = aIter->next) {
int max = 0;
xml_acl_t *acl = aIter->data;
if(acl->mode != xpf_acl_deny) {
/* Nothing to do */
} else if(acl->xpath) {
int lpc = 0;
xmlXPathObjectPtr xpathObj = xpath_search(target, acl->xpath);
max = numXpathResults(xpathObj);
for(lpc = 0; lpc < max; lpc++) {
xmlNode *match = getXpathResult(xpathObj, lpc);
crm_trace("Purging attributes from %s", acl->xpath);
if(__xml_purge_attributes(match) == FALSE && match == target) {
crm_trace("No access to the entire document for %s", user);
freeXpathObject(xpathObj);
return TRUE;
}
}
crm_trace("Enforced ACL %s (%d matches)", acl->xpath, max);
freeXpathObject(xpathObj);
}
}
p = target->_private;
if(is_set(p->flags, xpf_acl_deny) && __xml_purge_attributes(target) == FALSE) {
crm_trace("No access to the entire document for %s", user);
return TRUE;
}