aboutsummaryrefslogtreecommitdiff
path: root/common/data.c
diff options
context:
space:
mode:
Diffstat (limited to 'common/data.c')
-rw-r--r--common/data.c276
1 files changed, 276 insertions, 0 deletions
diff --git a/common/data.c b/common/data.c
new file mode 100644
index 0000000..ab9710f
--- /dev/null
+++ b/common/data.c
@@ -0,0 +1,276 @@
+#include <ctype.h>
+#include <libconfig.h>
+#include <libssh/libssh.h>
+#include <uthash.h>
+
+#include "config.h"
+#include "data_for_config.h"
+
+struct key {
+ const char *name; // key
+ ssh_key key;
+ UT_hash_handle hh; // makes this structure hashable
+};
+
+struct user {
+ const char *name; // key for hh_user
+ const char *pubkeystr; // key for hh_pubkey
+ UT_hash_handle hh_user, hh_pubkey; // makes this structure hashable, twice
+};
+
+struct host {
+ const char *name;
+ const char *address;
+ const char *user;
+ ssh_key key;
+ const char *pubkeystr;
+ UT_hash_handle hh; // makes this structure hashable
+};
+
+struct key * keys = NULL;
+struct user * users = NULL;
+struct user * pubkeys = NULL;
+struct host *hosts = NULL;
+
+char // returns 0 if ok, something else otherwise
+data_init(const config_t * config)
+{
+ config_setting_t *setting;
+ const int config_dir_len = strlen(CONFIG_DIR);
+
+ // We load the ssh keys in the hastable
+ setting = config_lookup(config, "hostkeys");
+ if(setting != NULL) {
+ int count = config_setting_length(setting);
+ for(int i = 0; i < count; ++i) {
+ config_setting_t *elt = config_setting_get_elem(setting, i);
+ const char *name, *key_path;
+ if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid key entry with no name.\n");
+ return 1;
+ }
+ struct key * tmp;
+ HASH_FIND_STR(keys, name, tmp);
+ if (tmp != NULL) {
+ fprintf(stderr, "Invalid key with duplicate name %s.\n", name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "path", &key_path) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid key entry %s with no path.\n", name);
+ return 1;
+ }
+ tmp = malloc(sizeof(struct key));
+ tmp->name = name;
+ char * key_realpath = malloc(strlen(key_path) + config_dir_len + 1);
+ strcpy(key_realpath, CONFIG_DIR);
+ strcpy(key_realpath + config_dir_len, key_path);
+ switch(ssh_pki_import_privkey_file(key_realpath, NULL, NULL, NULL, &tmp->key)) {
+ case SSH_EOF:
+ fprintf(stderr, "Error importing ssh key from file %s : file doesn't exist or permission denied.\n", key_realpath);
+ free(key_realpath);
+ free(tmp);
+ return 1;
+ break;
+ case SSH_ERROR:
+ fprintf(stderr, "Error importing ssh key from file %s.\n", key_realpath);
+ free(key_realpath);
+ free(tmp);
+ return 1;
+ break;
+ case SSH_OK:
+ break;
+ }
+ HASH_ADD_KEYPTR(hh, keys, tmp->name, strlen(tmp->name), tmp);
+ free(key_realpath);
+ }
+ }
+
+ // We load the users in the hastable
+ setting = config_lookup(config, "users");
+ if(setting != NULL) {
+ int count = config_setting_length(setting);
+ for(int i = 0; i < count; ++i) {
+ config_setting_t *elt = config_setting_get_elem(setting, i);
+ const char *name, *pubkeystr;
+ if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid user entry with no name.\n");
+ return 1;
+ }
+ unsigned int name_len = strlen(name);
+ struct user * tmp;
+ HASH_FIND(hh_user, users, name, name_len, tmp);
+ if (tmp != NULL) {
+ fprintf(stderr, "Invalid user with duplicate name %s.\n", name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "public_key", &pubkeystr) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid user entry %s with no public_key.\n", name);
+ return 1;
+ }
+ // TODO support other key types
+ // And find a cleaner way to strip this key header before importing, and store a type flag
+ char * rsa = "ssh-rsa ";
+ pubkeystr += strlen(rsa);
+ unsigned int pubkeystr_len = strlen(pubkeystr);
+ for (unsigned int i = 0; i < pubkeystr_len; ++i) {
+ if (isspace(pubkeystr[i]) == 0)
+ continue;
+ fprintf(stderr, "Invalid trailing characters in public key for user %s :%s.\n", name, pubkeystr+i);
+ return 1;
+ }
+ HASH_FIND(hh_pubkey, pubkeys, pubkeystr, pubkeystr_len, tmp);
+ if (tmp != NULL) {
+ fprintf(stderr, "Invalid user %s with duplicate public_key with %s.\n", name, tmp->name);
+ return 1;
+ }
+ ssh_key tmpkey;
+ switch(ssh_pki_import_pubkey_base64(pubkeystr, SSH_KEYTYPE_RSA, &tmpkey)) {
+ case SSH_ERROR:
+ fprintf(stderr, "Error importing public key for user %s.\n", name);
+ return 1;
+ break;
+ case SSH_OK:
+ ssh_key_free(tmpkey);
+ break;
+ }
+ tmp = malloc(sizeof(struct user));
+ tmp->name = name;
+ tmp->pubkeystr = pubkeystr;
+ HASH_ADD_KEYPTR(hh_user, users, tmp->name, name_len, tmp);
+ HASH_ADD_KEYPTR(hh_pubkey, pubkeys, tmp->pubkeystr, pubkeystr_len, tmp);
+ }
+ }
+
+ // We load the hosts in the hastable
+ setting = config_lookup(config, "hosts");
+ if(setting != NULL) {
+ int count = config_setting_length(setting);
+ for(int i = 0; i < count; ++i) {
+ config_setting_t *elt = config_setting_get_elem(setting, i);
+ const char *name, *address, *user, *hostkey, *pubkeystr;
+ if (config_setting_lookup_string(elt, "name", &name) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid host entry with no name.\n");
+ return 1;
+ }
+ struct host * tmp;
+ HASH_FIND_STR(hosts, name, tmp);
+ if (tmp != NULL) {
+ fprintf(stderr, "Invalid host with duplicate name %s.\n", name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "address", &address) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid host entry %s with no address.\n", name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "user", &user) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid host entry %s with no user.\n", name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "hostkey", &hostkey) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid host entry %s with no ssh_key.\n", name);
+ return 1;
+ }
+ struct key * key;
+ HASH_FIND_STR(keys, hostkey, key);
+ if (key == NULL) {
+ fprintf(stderr, "Host key \"%s\" was not found for host \"%s\".\n", hostkey, name);
+ return 1;
+ }
+ if (config_setting_lookup_string(elt, "public_key", &pubkeystr) == CONFIG_FALSE) {
+ fprintf(stderr, "Invalid user entry %s with no public_key.\n", name);
+ return 1;
+ }
+ // TODO support other key types
+ // And find a cleaner way to strip this key header before importing, and store a type flag
+ char * ecdsa = "ssh-ed25519 ";
+ pubkeystr += strlen(ecdsa);
+ unsigned int pubkeystr_len = strlen(pubkeystr);
+ for (unsigned int i = 0; i < pubkeystr_len; ++i) {
+ if (isspace(pubkeystr[i]) == 0)
+ continue;
+ fprintf(stderr, "Invalid trailing characters in public key for user %s :%s.\n", name, pubkeystr+i);
+ return 1;
+ }
+ ssh_key tmpkey;
+ switch(ssh_pki_import_pubkey_base64(pubkeystr, SSH_KEYTYPE_ED25519, &tmpkey)) {
+ case SSH_ERROR:
+ fprintf(stderr, "Error importing public key for user %s.\n", name);
+ free(tmp);
+ return 1;
+ break;
+ case SSH_OK:
+ ssh_key_free(tmpkey);
+ break;
+ }
+ tmp = malloc(sizeof(struct host));
+ tmp->name = name;
+ tmp->address = address;
+ tmp->user = user;
+ tmp->key = key->key;
+ tmp->pubkeystr = pubkeystr;
+ HASH_ADD_KEYPTR(hh, hosts, tmp->name, strlen(tmp->name), tmp);
+ }
+ }
+
+ return 0;
+}
+
+void data_clean(void)
+{
+ struct key *current_key, *tmp_key;
+
+ HASH_ITER(hh, keys, current_key, tmp_key) {
+ HASH_DEL(keys, current_key);
+ ssh_key_free(current_key->key);
+ free(current_key);
+ }
+
+ HASH_CLEAR(hh_user, users);
+
+ struct user *current_pubkey, *tmp_pubkey;
+ HASH_ITER(hh_pubkey, pubkeys, current_pubkey, tmp_pubkey) {
+ HASH_DELETE(hh_pubkey, pubkeys, current_pubkey);
+ free(current_pubkey);
+ }
+
+ struct host *current_host, *tmp_host;
+ HASH_ITER(hh, hosts, current_host, tmp_host) {
+ HASH_DEL(hosts, current_host);
+ free(current_host);
+ }
+}
+
+const char * // returns NULL if no user found
+data_get_username_from_pubkey(ssh_key pubkey)
+{
+ const char *username = NULL;
+ char *pubkeystr;
+ if (ssh_pki_export_pubkey_base64(pubkey, &pubkeystr) != SSH_OK) {
+ fprintf(stderr, "Got invalid public key from auth attempt, this shouldn't happen.\n");
+ return NULL;
+ }
+ unsigned int pubkeystr_len = strlen(pubkeystr);
+ struct user *tmp;
+ HASH_FIND(hh_pubkey, pubkeys, pubkeystr, pubkeystr_len, tmp);
+ if (tmp != NULL) {
+ username = tmp->name;
+ }
+ free(pubkeystr);
+ return username;
+}
+
+struct data_host_info * // returns NULL if no key found, this struct is to be freed from the calling code
+data_get_host_info(const char * hostname)
+{
+ struct host * tmp;
+ HASH_FIND_STR(hosts, hostname, tmp);
+ if (tmp != NULL) {
+ struct data_host_info *info = malloc(sizeof(struct data_host_info));
+ info->address = tmp->address;
+ info->username = tmp->user;
+ info->key = tmp->key;
+ info->pubkey = tmp->pubkeystr;
+ return info;
+ }
+ return NULL;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-18 10:05:40 +0000