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MXS-1354: Store users in a new format

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The users are now stored as an array of JSON objects. Legacy users are
automatically upgraded once they are loaded and a backup of the original
users file is created.

Removed the password parameter from the `remove user` maxadmin command as
well as all of the relevant functions. Requiring that an administrator
knows the password of the account to be deleted is not a sound requirement
now that, at least in theory, two types of accounts can be created.
This commit is contained in:
Markus Mäkelä
2017-08-15 22:51:50 +03:00
parent a3e7fd4f23
commit 2708942762
6 changed files with 119 additions and 215 deletions
Download Patch File Download Diff File Expand all files Collapse all files

309
server/core/adminusers.cc
View File

@ -31,13 +31,12 @@
* @file adminusers.c - Administration user account management
*/
static USERS *loadLinuxUsers();
static USERS *loadInetUsers();
static USERS *load_linux_users();
static USERS *load_inet_users();
static const char *admin_add_user(USERS** pusers, const char* fname,
const char* uname, const char* password);
static const char* admin_remove_user(USERS *users, const char* fname,
const char *uname, const char *passwd);
static const char* admin_remove_user(USERS *users, const char* fname, const char *uname);
@ -54,40 +53,43 @@ static const char INET_USERS_FILE_NAME[] = "passwd";
*/
void admin_users_init()
{
linux_users = loadLinuxUsers();
inet_users = loadInetUsers();
linux_users = load_linux_users();
inet_users = load_inet_users();
}
static const char *admin_add_user(USERS** pusers, const char* fname,
const char* uname, const char* password)
static bool admin_dump_users(USERS* users, const char* fname)
{
FILE *fp;
char path[PATH_MAX];
if (access(get_datadir(), F_OK) != 0)
{
if (mkdir(get_datadir(), S_IRWXU) != 0 && errno != EEXIST)
{
return ADMIN_ERR_PWDFILEOPEN;
MXS_ERROR("Failed to create directory '%s': %d, %s",
get_datadir(), errno, mxs_strerror(errno));
return false;
}
}
snprintf(path, sizeof(path), "%s/%s", get_datadir(), fname);
json_t* json = users_to_json(users);
bool rval = true;
if (json_dump_file(json, path, 0) == -1)
{
MXS_ERROR("Failed to dump admin users to file");
rval = false;
}
return rval;
}
static const char *admin_add_user(USERS** pusers, const char* fname,
const char* uname, const char* password)
{
if (*pusers == NULL)
{
MXS_NOTICE("Create initial password file.");
if ((*pusers = users_alloc()) == NULL)
{
return ADMIN_ERR_NOMEM;
}
if ((fp = fopen(path, "w")) == NULL)
{
MXS_ERROR("Unable to create password file %s: %d, %s", path,
errno, mxs_strerror(errno));
return ADMIN_ERR_PWDFILEOPEN;
}
fclose(fp);
*pusers = users_alloc();
}
if (!users_add(*pusers, uname, password ? password : "", ACCOUNT_ADMIN))
@ -95,183 +97,33 @@ static const char *admin_add_user(USERS** pusers, const char* fname,
return ADMIN_ERR_DUPLICATE;
}
if ((fp = fopen(path, "a")) == NULL)
if (!admin_dump_users(*pusers, fname))
{
MXS_ERROR("Unable to append to password file %s: %d, %s", path,
errno, mxs_strerror(errno));
return ADMIN_ERR_FILEAPPEND;
return ADMIN_ERR_FILEOPEN;
}
if (password)
{
fprintf(fp, "%s:%s\n", uname, password);
}
else
{
fprintf(fp, "%s\n", uname);
}
fclose(fp);
return ADMIN_SUCCESS;
}
static const char* admin_remove_user(USERS *users, const char* fname,
const char *uname, const char *passwd)
static const char* admin_remove_user(USERS *users, const char* fname, const char *uname)
{
FILE* fp;
FILE* fp_tmp;
char path[PATH_MAX];
char path_tmp[PATH_MAX];
char* home;
char fusr[LINELEN];
char fpwd[LINELEN];
char line[LINELEN];
fpos_t rpos;
if (strcmp(uname, DEFAULT_ADMIN_USER) == 0)
{
MXS_WARNING("Attempt to delete the default admin user '%s'.", uname);
return ADMIN_ERR_DELROOT;
}
if (!users_find(users, uname))
if (!users_delete(users, uname))
{
MXS_ERROR("Couldn't find user %s. Removing user failed.", uname);
return ADMIN_ERR_USERNOTFOUND;
}
if (passwd)
if (!admin_dump_users(users, fname))
{
if (admin_verify_inet_user(uname, passwd) == 0)
{
MXS_ERROR("Authentication failed, wrong user/password "
"combination. Removing user failed.");
return ADMIN_ERR_AUTHENTICATION;
}
return ADMIN_ERR_FILEOPEN;
}
/** Remove user from in-memory structure */
users_delete(users, uname);
/**
* Open passwd file and remove user from the file.
*/
snprintf(path, sizeof(path), "%s/%s", get_datadir(), fname);
snprintf(path_tmp, sizeof(path_tmp), "%s/%s_tmp", get_datadir(), fname);
/**
* Rewrite passwd file from memory.
*/
if ((fp = fopen(path, "r")) == NULL)
{
int err = errno;
MXS_ERROR("Unable to open password file %s : errno %d.\n"
"Removing user from file failed; it must be done "
"manually.",
path,
err);
return ADMIN_ERR_PWDFILEOPEN;
}
/**
* Open temporary passwd file.
*/
if ((fp_tmp = fopen(path_tmp, "w")) == NULL)
{
int err = errno;
MXS_ERROR("Unable to open tmp file %s : errno %d.\n"
"Removing user from passwd file failed; it must be done "
"manually.",
path_tmp,
err);
fclose(fp);
return ADMIN_ERR_TMPFILEOPEN;
}
/**
* Scan passwd and copy all but matching lines to temp file.
*/
if (fgetpos(fp, &rpos) != 0)
{
int err = errno;
MXS_ERROR("Unable to process passwd file %s : errno %d.\n"
"Removing user from file failed, and must be done "
"manually.",
path,
err);
fclose(fp);
fclose(fp_tmp);
unlink(path_tmp);
return ADMIN_ERR_PWDFILEACCESS;
}
while (fgets(fusr, sizeof(fusr), fp))
{
char *nl = strchr(fusr, '\n');
if (nl)
{
*nl = '\0';
}
else if (!feof(fp))
{
MXS_ERROR("Line length exceeds %d characters, possible corrupted "
"'passwd' file in: %s", LINELEN, path);
fclose(fp);
fclose(fp_tmp);
return ADMIN_ERR_PWDFILEACCESS;
}
/**
* Compare username what was found from passwd file.
* Unmatching lines are copied to tmp file.
*/
if (strncmp(uname, fusr, strlen(uname) + 1) != 0)
{
if (fsetpos(fp, &rpos) != 0)
{
/** one step back */
MXS_ERROR("Unable to set stream position. ");
}
if (fgets(line, LINELEN, fp))
{
fputs(line, fp_tmp);
}
else
{
MXS_ERROR("Failed to read line from admin users file");
}
}
if (fgetpos(fp, &rpos) != 0)
{
int err = errno;
MXS_ERROR("Unable to process passwd file %s : "
"errno %d.\n"
"Removing user from file failed, and must be "
"done manually.",
path,
err);
fclose(fp);
fclose(fp_tmp);
unlink(path_tmp);
return ADMIN_ERR_PWDFILEACCESS;
}
}
fclose(fp);
/**
* Replace original passwd file with new.
*/
if (rename(path_tmp, path))
{
int err = errno;
MXS_ERROR("Unable to rename new passwd file %s : errno "
"%d.\n"
"Rename it to %s manually.",
path_tmp,
err,
path);
unlink(path_tmp);
fclose(fp_tmp);
return ADMIN_ERR_PWDFILEACCESS;
}
fclose(fp_tmp);
return ADMIN_SUCCESS;
}
@ -348,28 +200,15 @@ json_t* admin_all_users_to_json(const char* host, enum user_type type)
return mxs_json_resource(host, path.c_str(), arr);
}
/**
* Load the admin users
*
* @return Table of users
*/
static USERS *
loadUsers(const char *fname)
USERS* load_legacy_users(FILE* fp)
{
USERS *rval;
FILE *fp;
char path[PATH_MAX], *home;
char path[PATH_MAX];
char uname[80];
int added_users = 0;
snprintf(path, sizeof(path), "%s/%s", get_datadir(), fname);
if ((fp = fopen(path, "r")) == NULL)
{
return NULL;
}
if ((rval = users_alloc()) == NULL)
{
fclose(fp);
return NULL;
}
while (fgets(uname, sizeof(uname), fp))
@ -408,7 +247,6 @@ loadUsers(const char *fname)
added_users++;
}
}
fclose(fp);
if (!added_users)
{
@ -419,15 +257,78 @@ loadUsers(const char *fname)
return rval;
}
static USERS *loadLinuxUsers()
/**
* Load the admin users
*
* @param fname Name of the file in the datadir to load
*
* @return Table of users
*/
static USERS* load_users(const char *fname)
{
return loadUsers(LINUX_USERS_FILE_NAME);
USERS *rval = NULL;
char path[PATH_MAX];
snprintf(path, sizeof(path), "%s/%s", get_datadir(), fname);
FILE* fp = fopen(path, "r");
if (fp)
{
json_error_t err;
json_t* json = json_loadf(fp, 0, &err);
if (json)
{
/** New format users */
rval = users_from_json(json);
}
else
{
/** Old style users file */
rval = load_legacy_users(fp);
if (rval)
{
/** Users loaded successfully, back up the original file and
* replace it with the new one */
const char backup_suffix[] = ".backup";
char newpath[strlen(path) + sizeof(backup_suffix)];
sprintf(newpath, "%s%s", path, backup_suffix);
if (rename(path, newpath) != 0)
{
MXS_ERROR("Failed to rename old users file: %d, %s",
errno, mxs_strerror(errno));
}
else if (!admin_dump_users(rval, fname))
{
MXS_ERROR("Failed to dump new users. Please rename the file "
"'%s' manually to '%s' and restart MaxScale to "
"attempt again.", newpath, path);
}
else
{
MXS_NOTICE("Upgraded users file at '%s' to new format, "
"backup of the old file is stored in '%s'.",
newpath, path);
}
}
}
fclose(fp);
}
return rval;
}
static USERS *loadInetUsers()
static USERS *load_linux_users()
{
return loadUsers(INET_USERS_FILE_NAME);
return load_users(LINUX_USERS_FILE_NAME);
}
static USERS *load_inet_users()
{
return load_users(INET_USERS_FILE_NAME);
}
/**
@ -451,7 +352,7 @@ const char *admin_enable_linux_account(const char *uname)
*/
const char* admin_disable_linux_account(const char* uname)
{
return admin_remove_user(linux_users, LINUX_USERS_FILE_NAME, uname, NULL);
return admin_remove_user(linux_users, LINUX_USERS_FILE_NAME, uname);
}
/**
@ -519,9 +420,9 @@ const char *admin_add_inet_user(const char *uname, const char* password)
*
* @return NULL on success or an error string on failure.
*/
const char* admin_remove_inet_user(const char* uname, const char *password)
const char* admin_remove_inet_user(const char* uname)
{
return admin_remove_user(inet_users, INET_USERS_FILE_NAME, uname, password);
return admin_remove_user(inet_users, INET_USERS_FILE_NAME, uname);
}
/**