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check.c
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/* ################################################################### */
/* Copyright 2022, Pierre Gentile ([email protected]) */
/* */
/* This Source Code Form is subject to the terms of the Mozilla Public */
/* License, v. 2.0. If a copy of the MPL was not distributed with this */
/* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
/* ################################################################### */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <regex.h>
#include <netdb.h>
#include <time.h>
#include <glob.h>
#include <assert.h>
#include <stdarg.h>
#include <sys/types.h>
#include <pwd.h>
#include <grp.h>
#include <sys/stat.h>
#include <dlfcn.h>
#include "xmalloc.h"
#include "config.h"
#include "list.h"
#include "types.h"
#include "log.h"
#include "utils.h"
#include "bst.h"
#include "conf.h"
#include "user.h"
#include "ht.h"
#include "passwd.h"
#include "check.h"
#include "strarray.h"
extern long path_max;
static int
regex_match(rule_t *rule,
char **argv,
int aind,
int pind,
pattern_t **pattern,
ht_t *re_patterns_ht,
char **err);
static int
text_match(rule_t *rule,
char **argv,
int aind,
int pind,
pattern_t **pattern,
ht_t *re_patterns_ht,
char **err);
static int
pos_match(rule_t *rule,
char **argv,
int aind,
int pind,
pattern_t **pattern,
ht_t *re_patterns_ht,
char **err);
static int max_pos = 0;
/* =================================================================== */
/* If the rule has a password parameter ask the target user's password */
/* returns 1 if the password is valid else 0. */
/* =================================================================== */
int
check_password(char *username)
{
int valid = 0;
if (is_in_foreground_process_group())
{
printf("An authorization request for \"%s\" is required.\n", username);
#if defined(HAVE_LIBPAM) && PAM_ENABLED == 1
valid = check_password_pam(username);
#else
valid = check_password_files(username);
#endif
}
return valid;
}
/* ================================================= */
/* Try to open a plugin and lanch its main function. */
/* ================================================= */
int
check_plugin(rule_t *rule, char *plugins_dir, param_t *param)
{
int rc = 0;
void *handle;
char *plugin_name; /* Plugin name, (first value of a plugin parameter. */
char *path = NULL; /* plugin full path. */
char *version; /* Plugin version. */
char *output; /* Plugin output or NULL. */
ll_t *val_list = param->val_list;
ll_node_t *node = val_list->head;
/* Prototypes for the plugin function. */
/* """"""""""""""""""""""""""""""""""" */
char *(*f_version)(void);
int (*f_main)(int, char **, char **);
/* the rest of the plugin parameter's arguments. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
char **args;
if (node)
{
args = xmalloc(val_list->len * sizeof(char *));
args[0] = NULL;
plugin_name = (char *)node->data;
path = xmalloc(strlen(plugins_dir) + strlen(plugin_name) + 1 + 1);
path = strcpy(path, plugins_dir);
path = strcat(path, "/");
path = strcat(path, plugin_name);
node = node->next;
if (val_list->len > 1)
{
int i = 0;
while (node)
{
args[i++] = (char *)node->data;
node = node->next;
}
args[i] = NULL;
}
}
else
{
trace(LOG_DATA, "[%s] missing plugin name.", param->name);
return 0;
}
if (path == NULL)
{
trace(LOG_DATA, "[%s] plugin \"%s\" not found.", param->name, plugin_name);
free(args);
return 0;
}
/* Try to get and the plugin functions. */
/* """""""""""""""""""""""""""""""""""" */
handle = dlopen(path, RTLD_LOCAL | RTLD_LAZY);
if (handle == NULL)
{
trace(LOG_WARN, "Could not open plugin: %s.", dlerror());
free(args);
return 0;
}
f_version = dlsym(handle, "sys_plugin_version"); /* optional function. */
f_main = dlsym(handle, "sys_plugin_main");
if (f_main == NULL)
{
trace(LOG_WARN, "Could not find plugin main function: %s.", dlerror());
free(args);
return 0;
}
version = NULL;
if (f_version)
version = f_version();
rc = f_main(val_list->len - 1, args, &output);
if (output != NULL)
{
if (version)
trace(LOG_INFO,
"[%s/%s] plugin: %s (%s) output: \"%s\"",
rule->tag,
param->name + 1,
plugin_name,
version,
output);
else
trace(LOG_INFO,
"[%s/%s] plugin: %s output: \"%s\"",
rule->tag,
param->name + 1,
plugin_name,
output);
free(output); /* clean-up. */
}
if (dlclose(handle) != 0)
{
trace(LOG_WARN, "Could not close plugin: %s.", dlerror());
free(args); /* clean-up. */
return 0;
}
free(args); /* clean-up. */
return rc;
}
/* ================================================================== */
/* In case the rule has plugin parameter, try to manage them. */
/* Each plugin must return 1 in case of success. */
/* The name of the first failing plugin in returned in failed_plugin. */
/* ================================================================== */
int
check_plugins(rule_t *rule, char *plugins_dir, char **failed_plugin)
{
int rc = 1;
ll_t *param_list;
ll_t *val_list;
ll_node_t *node;
param_t *param;
*failed_plugin = NULL;
param_list = rule->param_list;
if (param_list)
{
node = param_list->head;
while (node)
{
param = (param_t *)node->data;
if (*(param->name) == '%')
#ifdef PLUGINS_ENABLED
if (!check_plugin(rule, plugins_dir, param))
{
*failed_plugin = param->name + 1;
rc = 0;
break;
}
#else
trace(LOG_WARN,
"[%s] plugins not enabled, parameter \"%s\" ignored.",
rule->tag,
param->name);
#endif
node = node->next;
}
}
return rc;
}
/* ================================================================== */
/* Return 1 if at least one of the following parameter exists and has */
/* at least one value, else return 0. */
/* ================================================================== */
int
has_users_groups_netgroups_param(rule_t *rule)
{
char *params[] = { "!users", "users", "!groups", "groups",
"!netgroups", "netgroups", NULL };
char **p = params;
while (*p != NULL)
{
ll_t *val_list;
val_list = get_param_val_list(rule, *p);
if (val_list != NULL && val_list->len > 0)
return 1;
p++;
}
return 0;
}
/* =========================================================== */
/* Check if a rule passes the filters for users/group/netgroups */
/* returns 1 if so else 0. */
/* =========================================================== */
int
check_users_groups_netgroups(rule_t *rule, user_t *user_data)
{
time_t now = time(NULL);
char curr_date[13];
int nu, ng, nnetg;
int u, g, netg;
int denied, allowed;
if (!has_users_groups_netgroups_param(rule))
return 1;
/* Get the current date as a YYYYMMDDhhmm string. */
/* """""""""""""""""""""""""""""""""""""""""""""" */
strftime(curr_date, 13, "%Y%m%d%H%M", localtime(&now));
nu = check_users(rule, user_data, curr_date, "!users", 0);
ng = check_groups(rule, user_data, curr_date, "!groups");
nnetg = check_netgroups(rule, user_data, curr_date, "!netgroups");
denied = nu || ng || nnetg;
u = check_users(rule, user_data, curr_date, "users", 1);
g = check_groups(rule, user_data, curr_date, "groups");
netg = check_netgroups(rule, user_data, curr_date, "netgroups");
allowed = u || g || netg;
if (denied)
return 0;
if (allowed)
return 1;
return 0;
}
int
check_users(rule_t *rule,
user_t *ud,
char *date,
char *param_name,
int check_date)
{
regex_t regex_user;
regex_t regex_host;
ll_t *val_list;
ll_node_t *node;
int found;
found = 0;
/* Get the list of regular expression containing user restrictions. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
val_list = get_param_val_list(rule, param_name);
if (val_list && val_list->len == 0)
{
trace(LOG_WARN,
"users: empty, all users will be %s.",
(*param_name == '!') ? "accepted" : "denied");
if (*param_name == '!')
return 1;
else
return 0;
}
if (val_list)
{
char *delim1, *delim2;
node = val_list->head;
while (node)
{
char *val;
char *user;
char *host;
char *expiration;
int rc1;
int rc2;
host = expiration = NULL;
rc1 = rc2 = 0;
val = (char *)node->data;
/* Extracts the user and host from the value string */
/* """""""""""""""""""""""""""""""""""""""""""""""" */
user = xstrdup(val);
delim1 = strchr(user, '@');
if (delim1)
*delim1 = '\0';
delim2 = strrchr(user, '/');
if (delim2)
{
*delim2 = '\0';
expiration = delim2 + 1;
}
if (delim1 && *(delim1 + 1) != '\0')
host = delim1 + 1;
/* build the regular expression to match the user */
/* """""""""""""""""""""""""""""""""""""""""""""" */
char *str;
str = xmalloc(strlen(user) + 3);
/* make sure the RE does not match a word in the */
/* middle of a string for security reason. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
strcpy(str, "^");
strcat(str, user);
strcat(str, "$");
rc1 = regcomp(®ex_user, str, REG_EXTENDED | REG_NOSUB);
if (rc1 != 0)
{
trace(LOG_DATA,
"[%s] user: invalid regular expression \"%s\"",
rule->tag,
user);
}
free(str);
/* build the regular expression to match the host if any */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""" */
if (host)
{
str = xmalloc(strlen(host) + 3);
/* make sure the RE does not match a word in the */
/* middle of a string for security reason. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
strcpy(str, "^");
strcat(str, host);
strcat(str, "$");
rc2 = regcomp(®ex_host, str, REG_EXTENDED | REG_NOSUB);
if (rc2 != 0)
{
trace(LOG_DATA,
"[%s] host: invalid regular expression \"%s\"",
rule->tag,
host);
}
free(str);
}
/* If the regular expressions were correct, then see if the real user */
/* and hostname match them */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
if (rc1 == 0 && rc2 == 0)
{
if (regexec(®ex_user, ud->name, 0, NULL, 0) == 0)
{
int expired = check_date ? date_has_expired(date, expiration) : 0;
if (expired)
{
regfree(®ex_user);
node = node->next;
continue;
}
if (host && regexec(®ex_host, ud->hostname, 0, NULL, 0))
{
regfree(®ex_user);
regfree(®ex_host);
node = node->next;
continue;
}
found = 1;
break;
}
regfree(®ex_user);
}
else
trace(LOG_DATA,
"[%s] invalid regular expression \"%s\" or \"%s\".",
rule->tag,
user,
host);
node = node->next;
}
}
return found;
}
int
check_netgroups(rule_t *rule, user_t *ud, char *date, char *param_name)
{
ll_t *val_list;
ll_node_t *node;
char *host = NULL;
char *expiration = NULL;
char *delim1;
char *delim2;
int found;
#ifndef HAVE_INNETGR
trace(LOG_DATA, "netgroups are not allowed in this system.") return 0
#endif
found = 0;
/* Get the list of regular expression containing netgroups restrictions. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
val_list = get_param_val_list(rule, param_name);
if (val_list && val_list->len == 0)
{
trace(LOG_WARN,
"netgroups: empty, all netgroups will be %s.",
(*param_name == '!') ? "accepted" : "denied");
if (*param_name == '!')
return 1;
else
return 0;
}
if (val_list)
{
node = val_list->head;
while (node)
{
char *val;
char *netgroup;
val = (char *)node->data;
/* Extracts the netgroup and host from the value string */
/* """""""""""""""""""""""""""""""""""""""""""""""""""" */
netgroup = xstrdup(val);
delim1 = strchr(netgroup, '@');
if (delim1)
*delim1 = '\0';
delim2 = strrchr(netgroup, '/');
if (delim2)
{
*delim2 = '\0';
expiration = delim2 + 1;
}
if (delim1 && *(delim1 + 1) != '\0')
host = delim1 + 1;
/* The netgroups in this list are not regular expressions */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""" */
if (innetgr(val, ud->hostname, ud->name, NULL))
{
if (host && strcmp(host, ud->hostname) != 0)
{
trace(LOG_WARN,
"netgroups: \"%s\" is denied on this hostname.",
netgroup);
node = node->next;
continue;
}
if (date_has_expired(date, expiration))
{
trace(LOG_WARN, "netgroups: \"%s\" validity has expired.", netgroup);
node = node->next;
continue;
}
found = 1;
break;
}
node = node->next;
}
}
return found;
}
int
check_groups(rule_t *rule, user_t *ud, char *date, char *param_name)
{
unsigned r, g, regex_nb;
regex_t **group_regex;
regex_t **host_regex;
ll_t *val_list;
ll_node_t *node;
char *group;
char *host = NULL;
char *expiration = NULL;
char *val;
int found;
int rc1;
int rc2;
found = 0;
/* Get the list of regular expression containing groups restrictions. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
val_list = get_param_val_list(rule, param_name);
if (val_list && val_list->len == 0)
{
trace(LOG_WARN,
"groups: empty, all groups will be %s.",
(*param_name == '!') ? "denied" : "accepted");
if (*param_name == '!')
return 1;
else
return 0;
}
if (val_list)
{
char *delim1, *delim2;
/* Array of regex which will contain compiled regular expression */
/* from the given groups. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
group_regex = xmalloc((val_list->len) * sizeof(regex_t *));
host_regex = xmalloc((val_list->len) * sizeof(regex_t *));
/* Ensure that all the regex slot in the arrays are NULL. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""" */
for (r = 0; r < val_list->len; r++)
{
group_regex[r] = NULL;
host_regex[r] = NULL;
}
/* Initialize the regex production counter */
/* """"""""""""""""""""""""""""""""""""""" */
regex_nb = 0;
for (g = 0; g < ud->groups_nb; g++)
{
rc1 = 0;
rc2 = 0;
r = 0;
node = val_list->head;
while (node)
{
val = (char *)node->data;
/* Extracts the user and host from the value string */
/* """""""""""""""""""""""""""""""""""""""""""""""" */
group = xstrdup(val);
delim1 = strchr(group, '@');
if (delim1)
*delim1 = '\0';
delim2 = strrchr(group, '/');
if (delim2)
{
*delim2 = '\0';
expiration = delim2 + 1;
}
if (delim1 && *(delim1 + 1) != '\0')
host = delim1 + 1;
/* The regex compilation if only done once */
/* (when its place in the array still equates NULL) */
/* """""""""""""""""""""""""""""""""""""""""""""""" */
char *str;
if (group_regex[r] == NULL)
{
str = xmalloc(strlen(group) + 3);
/* make sure the RE does not match a word in the */
/* middle of a string for security reason. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
strcpy(str, "^");
strcat(str, group);
strcat(str, "$");
group_regex[r] = xmalloc(sizeof(regex_t));
rc1 = regcomp(group_regex[r], str, REG_EXTENDED | REG_NOSUB);
if (rc1 != 0)
{
trace(LOG_DATA,
"[%s] group: invalid regular expression \"%s\"",
rule->tag,
group);
}
free(str);
}
if (host)
{
if (host_regex[r] == NULL)
{
str = xmalloc(strlen(host) + 3);
/* make sure the RE does not match a word in the */
/* middle of a string for security reason. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
strcpy(str, "^");
strcat(str, host);
strcat(str, "$");
host_regex[r] = xmalloc(sizeof(regex_t));
rc2 = regcomp(host_regex[r], str, REG_EXTENDED | REG_NOSUB);
if (rc2 != 0)
{
trace(LOG_DATA,
"[%s] host: invalid regular expression \"%s\"",
rule->tag,
host);
}
free(str);
}
}
/* Update the regex production counter if needed */
/* """"""""""""""""""""""""""""""""""""""""""""" */
if (r >= regex_nb)
regex_nb++;
if (rc1 == 0 && rc2 == 0)
/* Check if one of the group in restrictions match the user's */
/* group of the current iteration or if its validity date has */
/* expired. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
{
if (regexec(group_regex[r], ud->group_names[g], 0, NULL, 0) == 0)
{
if (date_has_expired(date, expiration)
|| (host_regex[r]
&& regexec(host_regex[r], ud->hostname, 0, NULL, 0) != 0))
{
r++;
trace(LOG_WARN,
"groups: \"%s\" is denied on this host name "
"or its validity has expired.",
ud->group_names[g]);
node = node->next;
continue;
}
found = 1;
goto success;
}
}
else
trace(LOG_DATA,
"[%s] invalid regular expression \"%s\".",
rule->tag,
ud->group_names[g]);
r++; /* next group in restrictions. */
node = node->next;
}
}
success:
/* Free the produced regex */
/* """"""""""""""""""""""" */
for (r = 0; r < regex_nb; r++)
{
regfree(group_regex[r]);
free(group_regex[r]);
}
free(group_regex);
}
return found;
}
/* =================================================================== */
/* Manage the different cases when the name of the operation passed is */
/* interpreted as an executables. */
/* The possible path in the executable if taken into account. */
/* =================================================================== */
int
check_paths(rule_t *rule, char *user_command, char *param_name, char *rule_tag)
{
ll_t *val_list;
ll_node_t *node;
char *path_pattern;
char *command_path; /* The directory part (before last /) or NULL. */
char *command_base; /* the base part (after the last / if any). */
char *slash; /* The address of the last / if any in user_command. */
char *command; /* A work copy of user_command. */
char *tmp_rule_tag = NULL; /* temp variable used if we must override *
| the executable path when rule_tag has a *
| path. */
enum
{
NOT_FOUND = 0,
FOUND
};
/* ---------------------------------------------------------------------- */
/* 1 command has path + paths param present -> check coherency */
/* 2 command hasn't path + paths param present -> cannot check, accept if */
/* paths deny if !path */
/* 3 command has path + param not present -> cannot check, accept if */
/* paths deny if !path */
/* 4 command hasn't path + param not present -> same as 3. */
/* 5 param present + no paths given -> same as 3. */
/* ---------------------------------------------------------------------- */
path_max = pathconf("/", _PC_PATH_MAX);
if (path_max == -1)
path_max = 4096;
else
path_max++; /* Relative to /. */
/* Get the executable name preceded or not by its path. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""" */
command = xstrdup(rule->executable);
command[strcspn(command, " \t")] = '\0';
/* Extract the path from executable if any. */
/* """""""""""""""""""""""""""""""""""""""" */
slash = strrchr(command, '/');
if (slash != NULL)
{
*slash = '\0';
command_path = realpath(command, NULL);
command_base = slash + 1;
if (command_path == NULL)
error("%s: invalid path.", command);
}
else
{
command_path = NULL;
command_base = command;
}
/* Special processing if the CLI tag parameter have a path: */
/* This path must match the command path is any and if so this path */
/* will be compared with the paths in the "paths" parameter if present. */
/* """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
tmp_rule_tag = xstrdup(rule_tag);
slash = strrchr(tmp_rule_tag, '/');
if (slash != NULL)
{
char *tmp_rule_tag_path;
*slash = '\0';
tmp_rule_tag_path = realpath(tmp_rule_tag, NULL);
/* Fails if the real path is not valid without exiting the program */
/* as this case will be checked later. */
/* """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" */
if (tmp_rule_tag_path == NULL)
{
free(command);
free(tmp_rule_tag);
if (*param_name == '!') /* !paths: */
return FOUND;
else /* paths: */
return NOT_FOUND;
}
if (command_path != NULL && strcmp(command_path, tmp_rule_tag_path) != 0)
error("%s must be the same as the command path (%s).",
tmp_rule_tag_path,
command_path);
else
command_path = tmp_rule_tag_path;
}
/* Extract the list of the values of param_name. */
/* """"""""""""""""""""""""""""""""""""""""""""" */
val_list = get_param_val_list(rule, param_name);
if (val_list && val_list->len == 0)
{
free(command); /* 5 */
free(tmp_rule_tag);
return FOUND;
}
if (val_list) /* 1 or 2 */
{
if (command_path != NULL) /* 1 */
{
node = val_list->head;
while (node)
{
glob_t g;
path_pattern = (char *)node->data;
if (glob(path_pattern, 0, NULL, &g) == 0)
{
int c;
/* Try each of the expanded names found. */
/* ''''''''''''''''''''''''''''''''''''' */
for (c = 0; c < g.gl_pathc; c++)
{
if (strcmp(command_path, g.gl_pathv[c]) == 0)
{
globfree(&g);
goto found1; /* Found a match. */
}
}
}
globfree(&g);
node = node->next;
}
found1:
/* When all paths have been checked... */
/* """"""""""""""""""""""""""""""""""" */
free(command);
free(tmp_rule_tag);
if (node == NULL)
return NOT_FOUND;
else
return FOUND;
}
else /* 2 */
{
size_t len = strlen(command_base);
char *curr_path = calloc(1, path_max);
node = val_list->head;
while (node)
{
glob_t g;
path_pattern = (char *)node->data;
if (strlen(path_pattern) + len + 2 > path_max)
continue;
if (glob(path_pattern, 0, NULL, &g) == 0)
{
int c;
for (c = 0; c < g.gl_pathc; c++)
{
strncpy(curr_path, g.gl_pathv[c], path_max - 2);
curr_path = strcat(curr_path, "/");
curr_path = strcat(curr_path, command_base);
if (file_exists(curr_path))
{
globfree(&g);
goto found2; /* Exit from the loop, if curr_path exists. */
}
}
}
globfree(&g);
node = node->next;
}
found2:
/* When all the paths have been checked... */
/* """"""""""""""""""""""""""""""""""""""" */
free(curr_path);
free(command);
free(tmp_rule_tag);
if (node == NULL)
return NOT_FOUND;
else
return FOUND;
}
}
else /* 3 or 4 */
{
free(command);
free(tmp_rule_tag);
if (*param_name == '!') /* !paths: */
return NOT_FOUND;
else /* paths: */
return FOUND;
}
}
/* ========================================================================= */
/* Utility function to parse a pattern element for use in check_rule_options */
/* */
/* pattern: (in/out) textual representation on the pattern ($* per ex) */
/* type: (out) pattern type (enum). Defaults to TI */
/* pos: (out) pattern suffix to enable the user to set restrictions */
/* on different instances of pattern with the same type */
/* Defaults to -1 */