diff options
Diffstat (limited to 'registry/registry_internals.c')
| -rw-r--r-- | registry/registry_internals.c | 325 |
1 files changed, 325 insertions, 0 deletions
diff --git a/registry/registry_internals.c b/registry/registry_internals.c new file mode 100644 index 0000000..b54b901 --- /dev/null +++ b/registry/registry_internals.c @@ -0,0 +1,325 @@ +// 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; +} |