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-rw-r--r--registry/registry_internals.c325
1 files changed, 325 insertions, 0 deletions
diff --git a/registry/registry_internals.c b/registry/registry_internals.c
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+++ b/registry/registry_internals.c
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+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../daemon/common.h"
+#include "registry_internals.h"
+
+struct registry registry;
+
+// ----------------------------------------------------------------------------
+// common functions
+
+// parse a GUID and re-generated to be always lower case
+// this is used as a protection against the variations of GUIDs
+int regenerate_guid(const char *guid, char *result) {
+ uuid_t uuid;
+ if(unlikely(uuid_parse(guid, uuid) == -1)) {
+ info("Registry: GUID '%s' is not a valid GUID.", guid);
+ return -1;
+ }
+ else {
+ uuid_unparse_lower(uuid, result);
+
+#ifdef NETDATA_INTERNAL_CHECKS
+ if(strcmp(guid, result) != 0)
+ info("GUID '%s' and re-generated GUID '%s' differ!", guid, result);
+#endif /* NETDATA_INTERNAL_CHECKS */
+ }
+
+ return 0;
+}
+
+// make sure the names of the machines / URLs do not contain any tabs
+// (which are used as our separator in the database files)
+// and are properly trimmed (before and after)
+static inline char *registry_fix_machine_name(char *name, size_t *len) {
+ char *s = name?name:"";
+
+ // skip leading spaces
+ while(*s && isspace(*s)) s++;
+
+ // make sure all spaces are a SPACE
+ char *t = s;
+ while(*t) {
+ if(unlikely(isspace(*t)))
+ *t = ' ';
+
+ t++;
+ }
+
+ // remove trailing spaces
+ while(--t >= s) {
+ if(*t == ' ')
+ *t = '\0';
+ else
+ break;
+ }
+ t++;
+
+ if(likely(len))
+ *len = (t - s);
+
+ return s;
+}
+
+static inline char *registry_fix_url(char *url, size_t *len) {
+ size_t l = 0;
+ char *s = registry_fix_machine_name(url, &l);
+
+ // protection from too big URLs
+ if(l > registry.max_url_length) {
+ l = registry.max_url_length;
+ s[l] = '\0';
+ }
+
+ if(len) *len = l;
+ return s;
+}
+
+
+// ----------------------------------------------------------------------------
+// HELPERS
+
+// verify the person, the machine and the URL exist in our DB
+REGISTRY_PERSON_URL *registry_verify_request(char *person_guid, char *machine_guid, char *url, REGISTRY_PERSON **pp, REGISTRY_MACHINE **mm) {
+ char pbuf[GUID_LEN + 1], mbuf[GUID_LEN + 1];
+
+ if(!person_guid || !*person_guid || !machine_guid || !*machine_guid || !url || !*url) {
+ info("Registry Request Verification: invalid request! person: '%s', machine '%s', url '%s'", person_guid?person_guid:"UNSET", machine_guid?machine_guid:"UNSET", url?url:"UNSET");
+ return NULL;
+ }
+
+ // normalize the url
+ url = registry_fix_url(url, NULL);
+
+ // make sure the person GUID is valid
+ if(regenerate_guid(person_guid, pbuf) == -1) {
+ info("Registry Request Verification: invalid person GUID, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
+ return NULL;
+ }
+ person_guid = pbuf;
+
+ // make sure the machine GUID is valid
+ if(regenerate_guid(machine_guid, mbuf) == -1) {
+ info("Registry Request Verification: invalid machine GUID, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
+ return NULL;
+ }
+ machine_guid = mbuf;
+
+ // make sure the machine exists
+ REGISTRY_MACHINE *m = registry_machine_find(machine_guid);
+ if(!m) {
+ info("Registry Request Verification: machine not found, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
+ return NULL;
+ }
+ if(mm) *mm = m;
+
+ // make sure the person exist
+ REGISTRY_PERSON *p = registry_person_find(person_guid);
+ if(!p) {
+ info("Registry Request Verification: person not found, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
+ return NULL;
+ }
+ if(pp) *pp = p;
+
+ REGISTRY_PERSON_URL *pu = registry_person_url_index_find(p, url);
+ if(!pu) {
+ info("Registry Request Verification: URL not found for person, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
+ return NULL;
+ }
+ return pu;
+}
+
+
+// ----------------------------------------------------------------------------
+// REGISTRY REQUESTS
+
+REGISTRY_PERSON *registry_request_access(char *person_guid, char *machine_guid, char *url, char *name, time_t when) {
+ debug(D_REGISTRY, "registry_request_access('%s', '%s', '%s'): NEW REQUEST", (person_guid)?person_guid:"", machine_guid, url);
+
+ REGISTRY_MACHINE *m = registry_machine_get(machine_guid, when);
+ if(!m) return NULL;
+
+ // make sure the name is valid
+ size_t namelen;
+ name = registry_fix_machine_name(name, &namelen);
+
+ size_t urllen;
+ url = registry_fix_url(url, &urllen);
+
+ REGISTRY_PERSON *p = registry_person_get(person_guid, when);
+
+ REGISTRY_URL *u = registry_url_get(url, urllen);
+ registry_person_link_to_url(p, m, u, name, namelen, when);
+ registry_machine_link_to_url(m, u, when);
+
+ registry_log('A', p, m, u, name);
+
+ registry.usages_count++;
+
+ return p;
+}
+
+REGISTRY_PERSON *registry_request_delete(char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when) {
+ (void) when;
+
+ REGISTRY_PERSON *p = NULL;
+ REGISTRY_MACHINE *m = NULL;
+ REGISTRY_PERSON_URL *pu = registry_verify_request(person_guid, machine_guid, url, &p, &m);
+ if(!pu || !p || !m) return NULL;
+
+ // normalize the url
+ delete_url = registry_fix_url(delete_url, NULL);
+
+ // make sure the user is not deleting the url it uses
+ if(!strcmp(delete_url, pu->url->url)) {
+ info("Registry Delete Request: delete URL is the one currently accessed, person: '%s', machine '%s', url '%s', delete url '%s'"
+ , p->guid, m->guid, pu->url->url, delete_url);
+ return NULL;
+ }
+
+ REGISTRY_PERSON_URL *dpu = registry_person_url_index_find(p, delete_url);
+ if(!dpu) {
+ info("Registry Delete Request: URL not found for person: '%s', machine '%s', url '%s', delete url '%s'", p->guid
+ , m->guid, pu->url->url, delete_url);
+ return NULL;
+ }
+
+ registry_log('D', p, m, pu->url, dpu->url->url);
+ registry_person_unlink_from_url(p, dpu);
+
+ return p;
+}
+
+
+// a structure to pass to the dictionary_get_all() callback handler
+struct machine_request_callback_data {
+ REGISTRY_MACHINE *find_this_machine;
+ REGISTRY_PERSON_URL *result;
+};
+
+// the callback function
+// this will be run for every PERSON_URL of this PERSON
+static int machine_request_callback(void *entry, void *data) {
+ REGISTRY_PERSON_URL *mypu = (REGISTRY_PERSON_URL *)entry;
+ struct machine_request_callback_data *myrdata = (struct machine_request_callback_data *)data;
+
+ if(mypu->machine == myrdata->find_this_machine) {
+ myrdata->result = mypu;
+ return -1; // this will also stop the walk through
+ }
+
+ return 0; // continue
+}
+
+REGISTRY_MACHINE *registry_request_machine(char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when) {
+ (void)when;
+
+ char mbuf[GUID_LEN + 1];
+
+ REGISTRY_PERSON *p = NULL;
+ REGISTRY_MACHINE *m = NULL;
+ REGISTRY_PERSON_URL *pu = registry_verify_request(person_guid, machine_guid, url, &p, &m);
+ if(!pu || !p || !m) return NULL;
+
+ // make sure the machine GUID is valid
+ if(regenerate_guid(request_machine, mbuf) == -1) {
+ info("Registry Machine URLs request: invalid machine GUID, person: '%s', machine '%s', url '%s', request machine '%s'", p->guid, m->guid, pu->url->url, request_machine);
+ return NULL;
+ }
+ request_machine = mbuf;
+
+ // make sure the machine exists
+ m = registry_machine_find(request_machine);
+ if(!m) {
+ info("Registry Machine URLs request: machine not found, person: '%s', machine '%s', url '%s', request machine '%s'", p->guid, machine_guid, pu->url->url, request_machine);
+ return NULL;
+ }
+
+ // Verify the user has in the past accessed this machine
+ // We will walk through the PERSON_URLs to find the machine
+ // linking to our machine
+
+ // a structure to pass to the dictionary_get_all() callback handler
+ struct machine_request_callback_data rdata = { m, NULL };
+
+ // request a walk through on the dictionary
+ avl_traverse(&p->person_urls, machine_request_callback, &rdata);
+
+ if(rdata.result)
+ return m;
+
+ return NULL;
+}
+
+
+// ----------------------------------------------------------------------------
+// REGISTRY THIS MACHINE UNIQUE ID
+
+static inline int is_machine_guid_blacklisted(const char *guid) {
+ // these are machine GUIDs that have been included in distribution packages.
+ // we blacklist them here, so that the next version of netdata will generate
+ // new ones.
+
+ if(!strcmp(guid, "8a795b0c-2311-11e6-8563-000c295076a6")
+ || !strcmp(guid, "4aed1458-1c3e-11e6-a53f-000c290fc8f5")
+ ) {
+ error("Blacklisted machine GUID '%s' found.", guid);
+ return 1;
+ }
+
+ return 0;
+}
+
+char *registry_get_this_machine_hostname(void) {
+ return registry.hostname;
+}
+
+char *registry_get_this_machine_guid(void) {
+ static char guid[GUID_LEN + 1] = "";
+
+ if(likely(guid[0]))
+ return guid;
+
+ // read it from disk
+ int fd = open(registry.machine_guid_filename, O_RDONLY);
+ if(fd != -1) {
+ char buf[GUID_LEN + 1];
+ if(read(fd, buf, GUID_LEN) != GUID_LEN)
+ error("Failed to read machine GUID from '%s'", registry.machine_guid_filename);
+ else {
+ buf[GUID_LEN] = '\0';
+ if(regenerate_guid(buf, guid) == -1) {
+ error("Failed to validate machine GUID '%s' from '%s'. Ignoring it - this might mean this netdata will appear as duplicate in the registry.",
+ buf, registry.machine_guid_filename);
+
+ guid[0] = '\0';
+ }
+ else if(is_machine_guid_blacklisted(guid))
+ guid[0] = '\0';
+ }
+ close(fd);
+ }
+
+ // generate a new one?
+ if(!guid[0]) {
+ uuid_t uuid;
+
+ uuid_generate_time(uuid);
+ uuid_unparse_lower(uuid, guid);
+ guid[GUID_LEN] = '\0';
+
+ // save it
+ fd = open(registry.machine_guid_filename, O_WRONLY|O_CREAT|O_TRUNC, 444);
+ if(fd == -1)
+ fatal("Cannot create unique machine id file '%s'. Please fix this.", registry.machine_guid_filename);
+
+ if(write(fd, guid, GUID_LEN) != GUID_LEN)
+ fatal("Cannot write the unique machine id file '%s'. Please fix this.", registry.machine_guid_filename);
+
+ close(fd);
+ }
+
+ setenv("NETDATA_REGISTRY_UNIQUE_ID", guid, 1);
+
+ return guid;
+}