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1433 lines (1242 loc) · 42.5 KB
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#include "uwsgi.h"
/*
subscription subsystem
each subscription slot is as an hashed item in a dictionary
each slot has a circular linked list containing the nodes names
the structure and system is very similar to uwsgi_dyn_dict already used by the mime type parser
This system is not mean to run on shared memory. If you have multiple processes for the same app, you have to create
a new subscriptions slot list.
To avoid removal of already using nodes, a reference count system has been implemented
*/
extern struct uwsgi_server uwsgi;
char *uwsgi_subscription_algo_name(void *ptr) {
struct uwsgi_string_list *usl = uwsgi.subscription_algos;
while(usl) {
if (usl->custom_ptr == ptr) {
return usl->value;
}
usl = usl->next;
}
return NULL;
}
#ifdef UWSGI_SSL
static void uwsgi_subscription_sni_check(struct uwsgi_subscribe_slot *current_slot, struct uwsgi_subscribe_req *usr) {
if (usr->sni_key_len > 0 && usr->sni_crt_len > 0) {
if (!current_slot->sni_enabled) {
char *sni_key = uwsgi_concat2n(usr->sni_key, usr->sni_key_len, "", 0);
char *sni_crt = uwsgi_concat2n(usr->sni_crt, usr->sni_crt_len, "", 0);
char *sni_ca = NULL;
if (usr->sni_ca_len > 0) {
sni_ca = uwsgi_concat2n(usr->sni_ca, usr->sni_ca_len, "", 0);
}
char *servername = NULL;
char *colon = memchr(current_slot->key, ':', current_slot->keylen);
if (colon) {
servername = uwsgi_concat2n(current_slot->key, colon - current_slot->key, "", 0);
}
else {
servername = uwsgi_concat2n(current_slot->key, current_slot->keylen, "", 0);
}
if (uwsgi_ssl_add_sni_item(servername, sni_crt, sni_key, uwsgi.sni_dir_ciphers, sni_ca)) {
current_slot->sni_enabled = 1;
}
if (sni_key)
free(sni_key);
if (sni_crt)
free(sni_crt);
if (sni_ca)
free(sni_ca);
}
}
}
#endif
int uwsgi_subscription_credentials_check(struct uwsgi_subscribe_slot *slot, struct uwsgi_subscribe_req *usr) {
struct uwsgi_string_list *usl = NULL;
uwsgi_foreach(usl, uwsgi.subscriptions_credentials_check_dir) {
char *filename = uwsgi_concat2n(usl->value, usl->len, slot->key, slot->keylen);
struct stat st;
int ret = stat(filename, &st);
free(filename);
if (ret != 0)
continue;
if (st.st_uid != usr->uid)
continue;
if (st.st_gid != usr->gid)
continue;
// accepted...
return 1;
}
return 0;
}
struct uwsgi_subscribe_slot *uwsgi_get_subscribe_slot(struct uwsgi_subscribe_slot **slot, char *key, uint16_t keylen) {
int retried = 0;
retry:
if (keylen > 0xff)
return NULL;
uint32_t hash = djb33x_hash(key, keylen);
int hash_key = hash % 0xffff;
struct uwsgi_subscribe_slot *current_slot = slot[hash_key];
#ifdef UWSGI_DEBUG
uwsgi_log("****************************\n");
while (current_slot) {
uwsgi_log("slot %.*s %d\n", current_slot->keylen, current_slot->key, current_slot->hits);
current_slot = current_slot->next;
}
uwsgi_log("****************************\n");
current_slot = slot[hash_key];
#endif
while (current_slot) {
if (!uwsgi_strncmp(key, keylen, current_slot->key, current_slot->keylen)) {
// auto optimization
if (current_slot->prev) {
if (current_slot->hits > current_slot->prev->hits) {
struct uwsgi_subscribe_slot *slot_parent = current_slot->prev->prev, *slot_prev = current_slot->prev;
if (slot_parent) {
slot_parent->next = current_slot;
}
else {
slot[hash_key] = current_slot;
}
if (current_slot->next) {
current_slot->next->prev = slot_prev;
}
slot_prev->prev = current_slot;
slot_prev->next = current_slot->next;
current_slot->next = slot_prev;
current_slot->prev = slot_parent;
}
}
return current_slot;
}
current_slot = current_slot->next;
// check for loopy optimization
if (current_slot == slot[hash_key])
break;
}
// if we are here and in mountpoints mode, try the domain only variant
if (uwsgi.subscription_mountpoints && !retried) {
char *slash = memchr(key, '/', keylen);
if (slash) {
keylen = slash - key;
retried = 1;
goto retry;
}
}
return NULL;
}
struct uwsgi_subscribe_node *uwsgi_get_subscribe_node(struct uwsgi_subscribe_slot **slot, char *key, uint16_t keylen, struct uwsgi_subscription_client *client) {
if (keylen > 0xff)
return NULL;
struct uwsgi_subscribe_slot *current_slot = uwsgi_get_subscribe_slot(slot, key, keylen);
if (!current_slot)
return NULL;
// slot found, move up in the list increasing hits
current_slot->hits++;
time_t now = uwsgi_now();
struct uwsgi_subscribe_node *node = current_slot->nodes;
int subscription_age;
while (node) {
subscription_age = now - node->last_check;
// is the node alive ?
if ((node->len == 0 && (subscription_age > uwsgi.subscription_tolerance_inactive)) || (node->len > 0 && (subscription_age > uwsgi.subscription_tolerance))) {
if (node->death_mark == 0) {
if (node->len > 0) {
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => marking %.*s as failed (no announce received in %d seconds)\n", (int) uwsgi.mypid, (int) keylen, key, (int) node->len, node->name, uwsgi.subscription_tolerance);
}
else if (node->vassal_len > 0) {
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => marking vassal %.*s as failed (no announce received in %d seconds)\n", (int) uwsgi.mypid, (int) keylen, key, (int) node->vassal_len, node->vassal, uwsgi.subscription_tolerance_inactive);
}
}
node->failcnt++;
node->death_mark = 1;
}
// do i need to remove the node ?
if (node->death_mark && node->reference == 0) {
// remove the node and move to next
struct uwsgi_subscribe_node *dead_node = node;
node = node->next;
// if the slot has been removed, return NULL;
if (uwsgi_remove_subscribe_node(slot, dead_node) == 1) {
return NULL;
}
continue;
}
struct uwsgi_subscribe_node *chosen_node = current_slot->algo(current_slot, node, client);
if (chosen_node)
return chosen_node;
node = node->next;
}
return current_slot->algo(current_slot, node, client);
}
struct uwsgi_subscribe_node *uwsgi_get_subscribe_node_by_name(struct uwsgi_subscribe_slot **slot, char *key, uint16_t keylen, char *val, uint16_t vallen) {
if (keylen > 0xff)
return NULL;
struct uwsgi_subscribe_slot *current_slot = uwsgi_get_subscribe_slot(slot, key, keylen);
if (current_slot) {
struct uwsgi_subscribe_node *node = current_slot->nodes;
while (node) {
if (!uwsgi_strncmp(val, vallen, node->name, node->len)) {
return node;
}
node = node->next;
}
}
return NULL;
}
int uwsgi_remove_subscribe_node(struct uwsgi_subscribe_slot **slot, struct uwsgi_subscribe_node *node) {
int ret = 0;
struct uwsgi_subscribe_node *a_node;
struct uwsgi_subscribe_slot *node_slot = node->slot;
struct uwsgi_subscribe_slot *prev_slot = node_slot->prev;
struct uwsgi_subscribe_slot *next_slot = node_slot->next;
int hash_key = node_slot->hash;
// over-engineering to avoid race conditions
node->len = 0;
if (node == node_slot->nodes) {
node_slot->nodes = node->next;
}
else {
a_node = node_slot->nodes;
while (a_node) {
if (a_node->next == node) {
a_node->next = node->next;
break;
}
a_node = a_node->next;
}
}
free(node);
// no more nodes, remove the slot too
if (node_slot->nodes == NULL) {
ret = 1;
// first check if i am the only node
if ((!prev_slot && !next_slot) || next_slot == node_slot) {
#ifdef UWSGI_SSL
if (node_slot->sign_ctx) {
EVP_PKEY_free(node_slot->sign_public_key);
EVP_MD_CTX_destroy(node_slot->sign_ctx);
}
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
// if there is a SNI context active, destroy it
if (node_slot->sni_enabled) {
uwsgi_ssl_del_sni_item(node_slot->key, node_slot->keylen);
}
#endif
#endif
free(node_slot);
slot[hash_key] = NULL;
goto end;
}
// if i am the main entry point, set the next value
if (node_slot == slot[hash_key]) {
slot[hash_key] = next_slot;
}
if (prev_slot) {
prev_slot->next = next_slot;
}
if (next_slot) {
next_slot->prev = prev_slot;
}
#ifdef UWSGI_SSL
if (node_slot->sign_ctx) {
EVP_PKEY_free(node_slot->sign_public_key);
EVP_MD_CTX_destroy(node_slot->sign_ctx);
}
#endif
free(node_slot);
}
end:
return ret;
}
#ifdef UWSGI_SSL
static int subscription_new_sign_ctx(struct uwsgi_subscribe_slot *, struct uwsgi_subscribe_req *);
static int subscription_is_safe(struct uwsgi_subscribe_req *);
#endif
struct uwsgi_subscribe_node *uwsgi_add_subscribe_node(struct uwsgi_subscribe_slot **slot, struct uwsgi_subscribe_req *usr) {
struct uwsgi_subscribe_slot *current_slot = uwsgi_get_subscribe_slot(slot, usr->key, usr->keylen), *old_slot = NULL, *a_slot;
struct uwsgi_subscribe_node *node, *old_node = NULL;
if ((usr->address_len > 0xff || usr->address_len == 0) && (usr->vassal_len > 0xff || usr->vassal_len == 0))
return NULL;
if (uwsgi.subscription_vassal_required && usr->vassal_len == 0)
return NULL;
if (current_slot) {
#ifdef UWSGI_SSL
if (uwsgi.subscriptions_sign_check_dir && !uwsgi_subscription_sign_check(current_slot, usr)) {
return NULL;
}
#endif
if (uwsgi.subscriptions_credentials_check_dir && !uwsgi_subscription_credentials_check(current_slot, usr)) {
return NULL;
}
int has_address_and_vassal = 0;
if (usr->address_len > 0 && usr->vassal_len > 0)
has_address_and_vassal = 1;
node = current_slot->nodes;
while (node) {
if ((usr->address_len > 0 && !uwsgi_strncmp(node->name, node->len, usr->address, usr->address_len))
|| (usr->vassal_len > 0 && !uwsgi_strncmp(node->vassal, node->vassal_len, usr->vassal, usr->vassal_len))) {
#ifdef UWSGI_SSL
// this should avoid sending sniffed packets...
if (current_slot->sign_ctx && !subscription_is_safe(usr) && usr->unix_check <= node->unix_check) {
uwsgi_log("[uwsgi-subscription for pid %d] invalid (sniffed ?) packet sent for slot: %.*s node: %.*s unix_check: %lu\n", (int) uwsgi.mypid, usr->keylen, usr->key, (int) usr->address_len, usr->address, (unsigned long) usr->unix_check);
return NULL;
}
// eventually the packet could be upgraded to sni...
uwsgi_subscription_sni_check(current_slot, usr);
#endif
// only for vassal mode
if (has_address_and_vassal) {
if (usr->address_len == node->len && !memcmp(usr->address, node->name, node->len)) {
// record already exists, clear it ?
if (usr->clear) {
node->len = 0;
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => cleared address for vassal node: %.*s (weight: %d, backup: %d)\n", (int) uwsgi.mypid, usr->keylen, usr->key, (int) usr->vassal_len, usr->vassal, usr->weight, usr->backup_level);
}
}
else {
memcpy(node->name, usr->address, usr->address_len);
node->len = usr->address_len;
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => updated vassal node: %.*s with address %.*s (weight: %d, backup: %d)\n", (int) uwsgi.mypid, usr->keylen, usr->key, (int) usr->vassal_len, usr->vassal, (int) usr->address_len, usr->address, usr->weight, usr->backup_level);
}
}
// remove death mark and update cores and load
node->death_mark = 0;
node->last_check = uwsgi_now();
node->cores = usr->cores;
node->load = usr->load;
node->weight = usr->weight;
node->backup_level = usr->backup_level;
if (usr->proto_len > 0) {
node->proto = usr->proto[0];
}
if (!node->weight)
node->weight = 1;
node->last_requests = 0;
return node;
}
old_node = node;
node = node->next;
}
#ifdef UWSGI_SSL
if (current_slot->sign_ctx && !subscription_is_safe(usr) && usr->unix_check < (uwsgi_now() - (time_t) uwsgi.subscriptions_sign_check_tolerance)) {
uwsgi_log("[uwsgi-subscription for pid %d] invalid (sniffed ?) packet sent for slot: %.*s node: %.*s unix_check: %lu\n", (int) uwsgi.mypid, usr->keylen, usr->key, usr->address_len, usr->address, (unsigned long) usr->unix_check);
return NULL;
}
// check here as we are sure the node will be added
uwsgi_subscription_sni_check(current_slot, usr);
#endif
node = uwsgi_malloc(sizeof(struct uwsgi_subscribe_node));
node->len = usr->address_len;
node->modifier1 = usr->modifier1;
node->modifier2 = usr->modifier2;
node->requests = 0;
node->last_requests = 0;
node->tx = 0;
node->rx = 0;
node->reference = 0;
node->death_mark = 0;
node->failcnt = 0;
node->cores = usr->cores;
node->load = usr->load;
node->weight = usr->weight;
node->backup_level = usr->backup_level;
if (usr->proto_len > 0) {
node->proto = usr->proto[0];
}
node->unix_check = usr->unix_check;
if (!node->weight)
node->weight = 1;
node->wrr = 0;
node->pid = usr->pid;
node->uid = usr->uid;
node->gid = usr->gid;
node->notify[0] = 0;
if (usr->notify_len > 0 && usr->notify_len < 102) {
memcpy(node->notify, usr->notify, usr->notify_len);
node->notify[usr->notify_len] = 0;
}
node->last_check = uwsgi_now();
node->slot = current_slot;
node->vassal_len = usr->vassal_len;
if (node->len > 0)
memcpy(node->name, usr->address, node->len);
if (usr->vassal_len > 0)
memcpy(node->vassal, usr->vassal, node->vassal_len);
if (old_node) {
old_node->next = node;
}
node->next = NULL;
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => new node: %.*s (weight: %d, backup: %d)\n", (int) uwsgi.mypid, usr->keylen, usr->key, usr->address_len, usr->address, usr->weight, usr->backup_level);
if (node->notify[0]) {
char buf[1024];
int ret = snprintf(buf, 1024, "[subscription ack] %.*s => new node: %.*s", usr->keylen, usr->key, usr->address_len, usr->address);
if (ret > 0 && ret < 1024)
uwsgi_notify_msg(node->notify, buf, ret);
}
return node;
}
else {
current_slot = uwsgi_malloc(sizeof(struct uwsgi_subscribe_slot));
#ifdef UWSGI_SSL
current_slot->sign_ctx = NULL;
if (uwsgi.subscriptions_sign_check_dir && !subscription_new_sign_ctx(current_slot, usr)) {
free(current_slot);
return NULL;
}
#endif
uint32_t hash = djb33x_hash(usr->key, usr->keylen);
int hash_key = hash % 0xffff;
current_slot->hash = hash_key;
current_slot->keylen = usr->keylen;
memcpy(current_slot->key, usr->key, usr->keylen);
if (uwsgi.subscriptions_credentials_check_dir) {
if (!uwsgi_subscription_credentials_check(current_slot, usr)) {
free(current_slot);
return NULL;
}
}
current_slot->key[usr->keylen] = 0;
current_slot->hits = 0;
#ifdef UWSGI_SSL
current_slot->sni_enabled = 0;
uwsgi_subscription_sni_check(current_slot, usr);
#endif
current_slot->nodes = uwsgi_malloc(sizeof(struct uwsgi_subscribe_node));
current_slot->nodes->slot = current_slot;
current_slot->nodes->len = usr->address_len;
current_slot->nodes->reference = 0;
current_slot->nodes->requests = 0;
current_slot->nodes->last_requests = 0;
current_slot->nodes->tx = 0;
current_slot->nodes->rx = 0;
current_slot->nodes->death_mark = 0;
current_slot->nodes->failcnt = 0;
current_slot->nodes->modifier1 = usr->modifier1;
current_slot->nodes->modifier2 = usr->modifier2;
current_slot->nodes->cores = usr->cores;
current_slot->nodes->load = usr->load;
current_slot->nodes->weight = usr->weight;
current_slot->nodes->backup_level = usr->backup_level;
if (usr->proto_len > 0) {
current_slot->nodes->proto = usr->proto[0];
}
current_slot->nodes->unix_check = usr->unix_check;
if (!current_slot->nodes->weight)
current_slot->nodes->weight = 1;
current_slot->nodes->wrr = 0;
current_slot->nodes->pid = usr->pid;
current_slot->nodes->uid = usr->uid;
current_slot->nodes->gid = usr->gid;
current_slot->nodes->notify[0] = 0;
if (usr->notify_len > 0 && usr->notify_len < 102) {
memcpy(current_slot->nodes->notify, usr->notify, usr->notify_len);
current_slot->nodes->notify[usr->notify_len] = 0;
}
if (usr->address_len > 0)
memcpy(current_slot->nodes->name, usr->address, usr->address_len);
current_slot->nodes->vassal_len = usr->vassal_len;
if (current_slot->nodes->vassal_len > 0)
memcpy(current_slot->nodes->vassal, usr->vassal, usr->vassal_len);
current_slot->nodes->last_check = uwsgi_now();
current_slot->nodes->next = NULL;
a_slot = slot[hash_key];
while (a_slot) {
old_slot = a_slot;
a_slot = a_slot->next;
}
if (old_slot) {
old_slot->next = current_slot;
}
current_slot->prev = old_slot;
current_slot->next = NULL;
current_slot->algo = usr->algo;
if (!current_slot->algo) current_slot->algo = uwsgi.subscription_algo;
if (!slot[hash_key] || current_slot->prev == NULL) {
slot[hash_key] = current_slot;
}
uwsgi_log("[uwsgi-subscription for pid %d] new pool: %.*s (hash key: %d, algo: %s)\n", (int) uwsgi.mypid, usr->keylen, usr->key, current_slot->hash, uwsgi_subscription_algo_name(current_slot->algo));
if (usr->address_len > 0) {
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => new node: %.*s (weight: %d, backup: %d)\n", (int) uwsgi.mypid, usr->keylen, usr->key, usr->address_len, usr->address, usr->weight, usr->backup_level);
}
else {
uwsgi_log("[uwsgi-subscription for pid %d] %.*s => new vassal node: %.*s (weight: %d, backup: %d)\n", (int) uwsgi.mypid, usr->keylen, usr->key, usr->vassal_len, usr->vassal, usr->weight, usr->backup_level);
}
if (current_slot->nodes->notify[0]) {
char buf[1024];
int ret = snprintf(buf, 1024, "[subscription ack] %.*s => new node: %.*s", usr->keylen, usr->key, usr->address_len, usr->address);
if (ret > 0 && ret < 1024)
uwsgi_notify_msg(current_slot->nodes->notify, buf, ret);
}
return current_slot->nodes;
}
}
static void send_subscription(int sfd, char *host, char *message, uint16_t message_size) {
int fd = sfd;
struct sockaddr_in udp_addr;
struct sockaddr_un un_addr;
ssize_t ret;
char *udp_port = strchr(host, ':');
if (fd == -1) {
if (udp_port) {
fd = socket(AF_INET, SOCK_DGRAM, 0);
}
else {
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
}
if (fd < 0) {
uwsgi_error("send_subscription()/socket()");
return;
}
uwsgi_socket_nb(fd);
}
else if (fd == -2) {
static int unix_fd = -1;
static int inet_fd = -1;
if (udp_port) {
if (inet_fd == -1) {
inet_fd = socket(AF_INET, SOCK_DGRAM, 0);
if (inet_fd < 0) {
uwsgi_error("send_subscription()/socket()");
return;
}
uwsgi_socket_nb(inet_fd);
}
fd = inet_fd;
}
else {
if (unix_fd == -1) {
unix_fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if (unix_fd < 0) {
uwsgi_error("send_subscription()/socket()");
return;
}
uwsgi_socket_nb(unix_fd);
}
fd = unix_fd;
}
}
if (udp_port) {
udp_port[0] = 0;
memset(&udp_addr, 0, sizeof(struct sockaddr_in));
udp_addr.sin_family = AF_INET;
udp_addr.sin_port = htons(atoi(udp_port + 1));
udp_addr.sin_addr.s_addr = inet_addr(host);
ret = sendto(fd, message, message_size, 0, (struct sockaddr *) &udp_addr, sizeof(udp_addr));
udp_port[0] = ':';
}
else {
memset(&un_addr, 0, sizeof(struct sockaddr_un));
un_addr.sun_family = AF_UNIX;
// use 102 as the magic number
strncat(un_addr.sun_path, host, 102);
if (uwsgi.subscriptions_use_credentials) {
// could be useless as internally the socket could add them automagically
ret = uwsgi_pass_cred2(fd, message, message_size, (struct sockaddr *) &un_addr, sizeof(un_addr));
}
else {
ret = sendto(fd, message, message_size, 0, (struct sockaddr *) &un_addr, sizeof(un_addr));
}
}
if (ret < 0) {
uwsgi_error("send_subscription()/sendto()");
}
if (sfd == -1)
close(fd);
}
static int uwsgi_subscription_ub_fix(struct uwsgi_buffer *ub, uint8_t modifier1, uint8_t modifier2, uint8_t cmd, char *sign) {
#ifdef UWSGI_SSL
if (sign) {
if (uwsgi_buffer_append_keynum(ub, "unix", 4, (uwsgi_now() + (time_t) cmd)))
return -1;
unsigned int signature_len = 0;
char *signature = uwsgi_rsa_sign(sign, ub->buf + 4, ub->pos - 4, &signature_len);
if (signature && signature_len > 0) {
if (uwsgi_buffer_append_keyval(ub, "sign", 4, signature, signature_len)) {
free(signature);
return -1;
}
free(signature);
}
}
#endif
// add uwsgi header
if (uwsgi_buffer_set_uh(ub, 224, cmd)) return -1;
return 0;
}
static struct uwsgi_buffer *uwsgi_subscription_ub(char *key, size_t keysize, uint8_t modifier1, uint8_t modifier2, uint8_t cmd, char *socket_name, char *sign, char *sni_key, char *sni_crt, char *sni_ca) {
struct uwsgi_buffer *ub = uwsgi_buffer_new(4096);
// make space for uwsgi header
ub->pos = 4;
if (uwsgi_buffer_append_keyval(ub, "key", 3, key, keysize))
goto end;
if (uwsgi_buffer_append_keyval(ub, "address", 7, socket_name, strlen(socket_name)))
goto end;
if (uwsgi.subscribe_with_modifier1) {
modifier1 = atoi(uwsgi.subscribe_with_modifier1);
}
if (uwsgi_buffer_append_keynum(ub, "modifier1", 9, modifier1))
goto end;
if (uwsgi_buffer_append_keynum(ub, "modifier2", 9, modifier2))
goto end;
if (uwsgi_buffer_append_keynum(ub, "cores", 5, uwsgi.numproc * uwsgi.cores))
goto end;
if (uwsgi_buffer_append_keynum(ub, "load", 4, uwsgi.shared->load))
goto end;
if (uwsgi.auto_weight) {
if (uwsgi_buffer_append_keynum(ub, "weight", 6, uwsgi.numproc * uwsgi.cores))
goto end;
}
else {
if (uwsgi_buffer_append_keynum(ub, "weight", 6, uwsgi.weight))
goto end;
}
if (sni_key) {
if (uwsgi_buffer_append_keyval(ub, "sni_key", 7, sni_key, strlen(sni_key)))
goto end;
}
if (sni_crt) {
if (uwsgi_buffer_append_keyval(ub, "sni_crt", 7, sni_crt, strlen(sni_crt)))
goto end;
}
if (sni_ca) {
if (uwsgi_buffer_append_keyval(ub, "sni_ca", 6, sni_ca, strlen(sni_ca)))
goto end;
}
if (uwsgi.subscription_notify_socket) {
if (uwsgi_buffer_append_keyval(ub, "notify", 6, uwsgi.subscription_notify_socket, strlen(uwsgi.subscription_notify_socket)))
goto end;
}
else if (uwsgi.notify_socket_fd > -1 && uwsgi.notify_socket) {
if (uwsgi_buffer_append_keyval(ub, "notify", 6, uwsgi.notify_socket, strlen(uwsgi.notify_socket)))
goto end;
}
if (uwsgi_subscription_ub_fix(ub, modifier1, modifier2, cmd, sign)) goto end;
return ub;
end:
uwsgi_buffer_destroy(ub);
return NULL;
}
void uwsgi_send_subscription_from_fd(int fd, char *udp_address, char *key, size_t keysize, uint8_t modifier1, uint8_t modifier2, uint8_t cmd, char *socket_name, char *sign, char *sni_key, char *sni_crt, char *sni_ca) {
if (socket_name == NULL && !uwsgi.sockets)
return;
if (!socket_name) {
socket_name = uwsgi.sockets->name;
}
struct uwsgi_buffer *ub = uwsgi_subscription_ub(key, keysize, modifier1, modifier2, cmd, socket_name, sign, sni_key, sni_crt, sni_ca);
if (!ub)
return;
send_subscription(fd, udp_address, ub->buf, ub->pos);
uwsgi_buffer_destroy(ub);
}
void uwsgi_send_subscription(char *udp_address, char *key, size_t keysize, uint8_t modifier1, uint8_t modifier2, uint8_t cmd, char *socket_name, char *sign, char *sni_key, char *sni_crt, char *sni_ca) {
uwsgi_send_subscription_from_fd(-1, udp_address, key, keysize, modifier1, modifier2, cmd, socket_name, sign, sni_key, sni_crt, sni_ca);
}
#ifdef UWSGI_SSL
static int subscription_is_safe(struct uwsgi_subscribe_req *usr) {
struct uwsgi_string_list *usl = NULL;
uwsgi_foreach(usl, uwsgi.subscriptions_sign_skip_uid) {
if (usl->custom == 0) {
usl->custom = atoi(usl->value);
}
if (usr->uid > 0 && usr->uid == (uid_t) usl->custom) {
return 1;
}
}
return 0;
}
static int subscription_new_sign_ctx(struct uwsgi_subscribe_slot *slot, struct uwsgi_subscribe_req *usr) {
if (subscription_is_safe(usr)) return 1;
if (usr->sign_len == 0 || usr->base_len == 0)
return 0;
if (usr->unix_check < (uwsgi_now() - (time_t) uwsgi.subscriptions_sign_check_tolerance)) {
uwsgi_log("[uwsgi-subscription for pid %d] invalid (sniffed ?) packet sent for slot: %.*s node: %.*s unix_check: %lu\n", (int) uwsgi.mypid, usr->keylen, usr->key, usr->address_len, usr->address, (unsigned long) usr->unix_check);
return 0;
}
char *keyfile = uwsgi_sanitize_cert_filename(uwsgi.subscriptions_sign_check_dir, usr->key, usr->keylen);
FILE *kf = fopen(keyfile, "r");
free(keyfile);
if (!kf) return 0;
slot->sign_public_key = PEM_read_PUBKEY(kf, NULL, NULL, NULL);
fclose(kf);
if (!slot->sign_public_key) {
uwsgi_log("unable to load public key for %.*s\n", usr->keylen, usr->key);
return 0;
}
slot->sign_ctx = EVP_MD_CTX_create();
if (!slot->sign_ctx) {
uwsgi_log("unable to initialize EVP context for %.*s\n", usr->keylen, usr->key);
EVP_PKEY_free(slot->sign_public_key);
return 0;
}
if (!uwsgi_subscription_sign_check(slot, usr)) {
EVP_PKEY_free(slot->sign_public_key);
EVP_MD_CTX_destroy(slot->sign_ctx);
return 0;
}
return 1;
}
int uwsgi_subscription_sign_check(struct uwsgi_subscribe_slot *slot, struct uwsgi_subscribe_req *usr) {
if (subscription_is_safe(usr)) return 1;
if (usr->sign_len == 0 || usr->base_len == 0)
return 0;
if (!slot->sign_ctx) {
if (!subscription_new_sign_ctx(slot, usr)) return 0;
}
if (EVP_VerifyInit_ex(slot->sign_ctx, uwsgi.subscriptions_sign_check_md, NULL) == 0) {
ERR_print_errors_fp(stderr);
return 0;
}
if (EVP_VerifyUpdate(slot->sign_ctx, usr->base, usr->base_len) == 0) {
ERR_print_errors_fp(stderr);
return 0;
}
if (EVP_VerifyFinal(slot->sign_ctx, (unsigned char *) usr->sign, usr->sign_len, slot->sign_public_key) != 1) {
#ifdef UWSGI_DEBUG
ERR_print_errors_fp(stderr);
#endif
return 0;
}
return 1;
}
#endif
int uwsgi_no_subscriptions(struct uwsgi_subscribe_slot **slot) {
int i;
for (i = 0; i < UMAX16; i++) {
if (slot[i])
return 0;
}
return 1;
}
void uwsgi_subscribe(char *subscription, uint8_t cmd) {
size_t subfile_size;
size_t i;
char *key = NULL;
int keysize = 0;
char *modifier1 = NULL;
int modifier1_len = 0;
char *socket_name = NULL;
char *udp_address = subscription;
char *udp_port = NULL;
char *subscription_key = NULL;
char *sign = NULL;
// check for explicit socket_name
char *equal = strchr(subscription, '=');
if (equal) {
socket_name = subscription;
if (socket_name[0] == '=') {
equal = strchr(socket_name + 1, '=');
if (!equal)
return;
*equal = '\0';
struct uwsgi_socket *us = uwsgi_get_shared_socket_by_num(atoi(socket_name + 1));
if (!us)
return;
socket_name = us->name;
}
*equal = '\0';
udp_address = equal + 1;
}
// check for unix socket
if (udp_address[0] != '/') {
udp_port = strchr(udp_address, ':');
if (!udp_port) {
if (equal)
*equal = '=';
return;
}
subscription_key = strchr(udp_port + 1, ':');
}
else {
subscription_key = strchr(udp_address + 1, ':');
}
if (!subscription_key) {
if (equal)
*equal = '=';
return;
}
udp_address = uwsgi_concat2n(udp_address, subscription_key - udp_address, "", 0);
if (subscription_key[1] == '@') {
if (!uwsgi_file_exists(subscription_key + 2))
goto clear;
char *lines = uwsgi_open_and_read(subscription_key + 2, &subfile_size, 1, NULL);
if (subfile_size > 0) {
key = lines;
for (i = 0; i < subfile_size; i++) {
if (lines[i] == 0) {
if (keysize > 0) {
if (key[0] != '#' && key[0] != '\n') {
modifier1 = strchr(key, ',');
if (modifier1) {
modifier1[0] = 0;
modifier1++;
modifier1_len = strlen(modifier1);
keysize = strlen(key);
}
uwsgi_send_subscription(udp_address, key, keysize, uwsgi_str_num(modifier1, modifier1_len), 0, cmd, socket_name, sign, NULL, NULL, NULL);
modifier1 = NULL;
modifier1_len = 0;
}
}
break;
}
else if (lines[i] == '\n') {
if (keysize > 0) {
if (key[0] != '#' && key[0] != '\n') {
lines[i] = 0;
modifier1 = strchr(key, ',');
if (modifier1) {
modifier1[0] = 0;
modifier1++;
modifier1_len = strlen(modifier1);
keysize = strlen(key);
}
uwsgi_send_subscription(udp_address, key, keysize, uwsgi_str_num(modifier1, modifier1_len), 0, cmd, socket_name, sign, NULL, NULL, NULL);
modifier1 = NULL;
modifier1_len = 0;
lines[i] = '\n';
}
}
key = lines + i + 1;
keysize = 0;
continue;
}
keysize++;
}
}
free(lines);
}
else {
modifier1 = strchr(subscription_key + 1, ',');
if (modifier1) {
modifier1[0] = 0;
modifier1++;
sign = strchr(modifier1 + 1, ',');
if (sign) {
*sign = 0;
sign++;
}
modifier1_len = strlen(modifier1);
}
uwsgi_send_subscription(udp_address, subscription_key + 1, strlen(subscription_key + 1), uwsgi_str_num(modifier1, modifier1_len), 0, cmd, socket_name, sign, NULL, NULL, NULL);
if (modifier1)
modifier1[-1] = ',';
if (sign)
sign[-1] = ',';
}
clear:
if (equal)
*equal = '=';
free(udp_address);
}
void uwsgi_subscribe2(char *arg, uint8_t cmd) {
char *s2_server = NULL;
char *s2_key = NULL;
char *s2_socket = NULL;
char *s2_addr = NULL;
char *s2_weight = NULL;
char *s2_sign = NULL;
char *s2_modifier1 = NULL;
char *s2_modifier2 = NULL;
char *s2_check = NULL;
char *s2_sni_key = NULL;
char *s2_sni_crt = NULL;
char *s2_sni_ca = NULL;
char *s2_proto = NULL;
char *s2_algo = NULL;
char *s2_backup = NULL;
char *s2_vassal = NULL;
char *s2_inactive = NULL;
struct uwsgi_buffer *ub = NULL;
if (uwsgi_kvlist_parse(arg, strlen(arg), ',', '=',
"server", &s2_server,
"key", &s2_key,
"socket", &s2_socket,
"addr", &s2_addr,
"address", &s2_addr,
"weight", &s2_weight,
"modifier1", &s2_modifier1,
"modifier2", &s2_modifier2,
"sign", &s2_sign,
"check", &s2_check,
"sni_key", &s2_sni_key,
"sni_crt", &s2_sni_crt,
"sni_ca", &s2_sni_ca,
"proto", &s2_proto,
"algo", &s2_algo,
You can’t perform that action at this time.