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/*
* Copyright 2011-2025 the Pacemaker project contributors
*
* The version control history for this file may have further details.
*
* This source code is licensed under the GNU Lesser General Public License
* version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
*/
#include <crm_internal.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#include <glib.h>
#include <crm/common/util.h>
/*!
* \internal
* \brief Read file contents into a string, with trailing whitespace removed
*
* \param[in] filename Name of file to read
*
* \return File contents as a string, or \c NULL on failure or empty file
*
* \note It would be simpler to call \c pcmk__file_contents() directly without
* trimming trailing whitespace. However, this would change hashes for
* existing value files that have trailing whitespace. Similarly, if we
* trim trailing whitespace, it would make sense to trim leading
* whitespace, but this changes existing hashes.
*/
static char *
read_file_trimmed(const char *filename)
{
char *p = NULL;
char *buf = NULL;
int rc = pcmk__file_contents(filename, &buf);
if (rc != pcmk_rc_ok) {
crm_err("Failed to read %s: %s", filename, pcmk_rc_str(rc));
free(buf);
return NULL;
}
if (buf == NULL) {
crm_err("File %s is empty", filename);
return NULL;
}
// Strip trailing white space
for (p = buf + strlen(buf) - 1; (p >= buf) && isspace(*p); p--);
*(p + 1) = '\0';
return buf;
}
/*!
* \internal
* \brief Read checksum from a file and compare against calculated checksum
*
* \param[in] filename File containing stored checksum
* \param[in] secret_value String to calculate checksum from
* \param[in] rsc_id Resource ID (for logging only)
* \param[in] param Parameter name (for logging only)
*
* \return Standard Pacemaker return code
*/
static int
validate_hash(const char *filename, const char *secret_value,
const char *rsc_id, const char *param)
{
char *stored = NULL;
char *calculated = NULL;
int rc = pcmk_rc_ok;
stored = read_file_trimmed(filename);
if (stored == NULL) {
crm_err("Could not read md5 sum for resource %s parameter '%s' from "
"file '%s'",
rsc_id, param, filename);
rc = ENOENT;
goto done;
}
calculated = crm_md5sum(secret_value);
if (calculated == NULL) {
// Should be impossible
rc = EINVAL;
goto done;
}
crm_trace("Stored hash: %s, calculated hash: %s", stored, calculated);
if (!pcmk__str_eq(stored, calculated, pcmk__str_casei)) {
crm_err("Calculated md5 sum for resource %s parameter '%s' does not "
"match stored md5 sum",
rsc_id, param);
rc = pcmk_rc_cib_corrupt;
}
done:
free(stored);
free(calculated);
return rc;
}
/*!
* \internal
* \brief Read secret parameter values from file
*
* Given a table of resource parameters, if any of their values are the
* magic string indicating a CIB secret, replace that string with the
* secret read from the file appropriate to the given resource.
*
* \param[in] rsc_id Resource whose parameters are being checked
* \param[in,out] params Resource parameters to check
*
* \return Standard Pacemaker return code
*/
int
pcmk__substitute_secrets(const char *rsc_id, GHashTable *params)
{
GHashTableIter iter;
char *param = NULL;
char *value = NULL;
GString *filename = NULL;
gsize dir_len = 0;
int rc = pcmk_rc_ok;
if (params == NULL) {
return pcmk_rc_ok;
}
// Some params are sent with operations, so we cannot cache secret params
g_hash_table_iter_init(&iter, params);
while (g_hash_table_iter_next(&iter, (gpointer *) ¶m,
(gpointer *) &value)) {
char *secret_value = NULL;
int hash_rc = pcmk_rc_ok;
if (!pcmk__str_eq(value, "lrm://", pcmk__str_none)) {
// Not a secret parameter
continue;
}
if (filename == NULL) {
// First secret parameter. Fill in directory path for use with all.
crm_debug("Replacing secret parameters for resource %s", rsc_id);
filename = g_string_sized_new(128);
pcmk__g_strcat(filename, PCMK__CIB_SECRETS_DIR "/", rsc_id, "/",
NULL);
dir_len = filename->len;
} else {
// Reset filename to the resource's secrets directory path
g_string_truncate(filename, dir_len);
}
// Path to file containing secret value for this parameter
g_string_append(filename, param);
secret_value = read_file_trimmed(filename->str);
if (secret_value == NULL) {
crm_err("Secret value for resource %s parameter '%s' not found in "
PCMK__CIB_SECRETS_DIR,
rsc_id, param);
rc = ENOENT;
continue;
}
// Path to file containing md5 sum for this parameter
g_string_append(filename, ".sign");
hash_rc = validate_hash(filename->str, secret_value, rsc_id, param);
if (hash_rc != pcmk_rc_ok) {
rc = hash_rc;
free(secret_value);
continue;
}
g_hash_table_iter_replace(&iter, (gpointer) secret_value);
}
if (filename != NULL) {
g_string_free(filename, TRUE);
}
return rc;
}
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