createuser.c

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/*-------------------------------------------------------------------------
 *
 * createuser
 *
 * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/bin/scripts/createuser.c
 *
 *-------------------------------------------------------------------------
 */

#include "postgres_fe.h"

#include <limits.h>

#include "common.h"
#include "common/logging.h"
#include "common/string.h"
#include "fe_utils/option_utils.h"
#include "fe_utils/simple_list.h"
#include "fe_utils/string_utils.h"


static void help(const char *progname);

int
main(int argc, char *argv[])
{
    static struct option long_options[] = {
        {"host", required_argument, NULL, 'h'},
        {"port", required_argument, NULL, 'p'},
        {"username", required_argument, NULL, 'U'},
        {"role", required_argument, NULL, 'g'},
        {"no-password", no_argument, NULL, 'w'},
        {"password", no_argument, NULL, 'W'},
        {"echo", no_argument, NULL, 'e'},
        {"createdb", no_argument, NULL, 'd'},
        {"no-createdb", no_argument, NULL, 'D'},
        {"superuser", no_argument, NULL, 's'},
        {"no-superuser", no_argument, NULL, 'S'},
        {"createrole", no_argument, NULL, 'r'},
        {"no-createrole", no_argument, NULL, 'R'},
        {"inherit", no_argument, NULL, 'i'},
        {"no-inherit", no_argument, NULL, 'I'},
        {"login", no_argument, NULL, 'l'},
        {"no-login", no_argument, NULL, 'L'},
        {"replication", no_argument, NULL, 1},
        {"no-replication", no_argument, NULL, 2},
        {"interactive", no_argument, NULL, 3},
        {"connection-limit", required_argument, NULL, 'c'},
        {"pwprompt", no_argument, NULL, 'P'},
        {"encrypted", no_argument, NULL, 'E'},
        {NULL, 0, NULL, 0}
    };

    const char *progname;
    int         optindex;
    int         c;
    const char *newuser = NULL;
    char       *host = NULL;
    char       *port = NULL;
    char       *username = NULL;
    SimpleStringList roles = {NULL, NULL};
    enum trivalue prompt_password = TRI_DEFAULT;
    ConnParams  cparams;
    bool        echo = false;
    bool        interactive = false;
    int         conn_limit = -2;    /* less than minimum valid value */
    bool        pwprompt = false;
    char       *newpassword = NULL;

    /* Tri-valued variables.  */
    enum trivalue createdb = TRI_DEFAULT,
                superuser = TRI_DEFAULT,
                createrole = TRI_DEFAULT,
                inherit = TRI_DEFAULT,
                login = TRI_DEFAULT,
                replication = TRI_DEFAULT;

    PQExpBufferData sql;

    PGconn     *conn;
    PGresult   *result;

    pg_logging_init(argv[0]);
    progname = get_progname(argv[0]);
    set_pglocale_pgservice(argv[0], PG_TEXTDOMAIN("pgscripts"));

    handle_help_version_opts(argc, argv, "createuser", help);

    while ((c = getopt_long(argc, argv, "h:p:U:g:wWedDsSrRiIlLc:PE",
                            long_options, &optindex)) != -1)
    {
        switch (c)
        {
            case 'h':
                host = pg_strdup(optarg);
                break;
            case 'p':
                port = pg_strdup(optarg);
                break;
            case 'U':
                username = pg_strdup(optarg);
                break;
            case 'g':
                simple_string_list_append(&roles, optarg);
                break;
            case 'w':
                prompt_password = TRI_NO;
                break;
            case 'W':
                prompt_password = TRI_YES;
                break;
            case 'e':
                echo = true;
                break;
            case 'd':
                createdb = TRI_YES;
                break;
            case 'D':
                createdb = TRI_NO;
                break;
            case 's':
                superuser = TRI_YES;
                break;
            case 'S':
                superuser = TRI_NO;
                break;
            case 'r':
                createrole = TRI_YES;
                break;
            case 'R':
                createrole = TRI_NO;
                break;
            case 'i':
                inherit = TRI_YES;
                break;
            case 'I':
                inherit = TRI_NO;
                break;
            case 'l':
                login = TRI_YES;
                break;
            case 'L':
                login = TRI_NO;
                break;
            case 'c':
                if (!option_parse_int(optarg, "-c/--connection-limit",
                                      -1, INT_MAX, &conn_limit))
                    exit(1);
                break;
            case 'P':
                pwprompt = true;
                break;
            case 'E':
                /* no-op, accepted for backward compatibility */
                break;
            case 1:
                replication = TRI_YES;
                break;
            case 2:
                replication = TRI_NO;
                break;
            case 3:
                interactive = true;
                break;
            default:
                fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
                exit(1);
        }
    }

    switch (argc - optind)
    {
        case 0:
            break;
        case 1:
            newuser = argv[optind];
            break;
        default:
            pg_log_error("too many command-line arguments (first is \"%s\")",
                         argv[optind + 1]);
            fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
            exit(1);
    }

    if (newuser == NULL)
    {
        if (interactive)
        {
            newuser = simple_prompt("Enter name of role to add: ", true);
        }
        else
        {
            if (getenv("PGUSER"))
                newuser = getenv("PGUSER");
            else
                newuser = get_user_name_or_exit(progname);
        }
    }

    if (pwprompt)
    {
        char       *pw2;

        newpassword = simple_prompt("Enter password for new role: ", false);
        pw2 = simple_prompt("Enter it again: ", false);
        if (strcmp(newpassword, pw2) != 0)
        {
            fprintf(stderr, _("Passwords didn't match.\n"));
            exit(1);
        }
        free(pw2);
    }

    if (superuser == 0)
    {
        if (interactive && yesno_prompt("Shall the new role be a superuser?"))
            superuser = TRI_YES;
        else
            superuser = TRI_NO;
    }

    if (superuser == TRI_YES)
    {
        /* Not much point in trying to restrict a superuser */
        createdb = TRI_YES;
        createrole = TRI_YES;
    }

    if (createdb == 0)
    {
        if (interactive && yesno_prompt("Shall the new role be allowed to create databases?"))
            createdb = TRI_YES;
        else
            createdb = TRI_NO;
    }

    if (createrole == 0)
    {
        if (interactive && yesno_prompt("Shall the new role be allowed to create more new roles?"))
            createrole = TRI_YES;
        else
            createrole = TRI_NO;
    }

    if (inherit == 0)
        inherit = TRI_YES;

    if (login == 0)
        login = TRI_YES;

    cparams.dbname = NULL;      /* this program lacks any dbname option... */
    cparams.pghost = host;
    cparams.pgport = port;
    cparams.pguser = username;
    cparams.prompt_password = prompt_password;
    cparams.override_dbname = NULL;

    conn = connectMaintenanceDatabase(&cparams, progname, echo);

    initPQExpBuffer(&sql);

    printfPQExpBuffer(&sql, "CREATE ROLE %s", fmtId(newuser));
    if (newpassword)
    {
        char       *encrypted_password;

        appendPQExpBufferStr(&sql, " PASSWORD ");

        encrypted_password = PQencryptPasswordConn(conn,
                                                   newpassword,
                                                   newuser,
                                                   NULL);
        if (!encrypted_password)
        {
            pg_log_error("password encryption failed: %s",
                         PQerrorMessage(conn));
            exit(1);
        }
        appendStringLiteralConn(&sql, encrypted_password, conn);
        PQfreemem(encrypted_password);
    }
    if (superuser == TRI_YES)
        appendPQExpBufferStr(&sql, " SUPERUSER");
    if (superuser == TRI_NO)
        appendPQExpBufferStr(&sql, " NOSUPERUSER");
    if (createdb == TRI_YES)
        appendPQExpBufferStr(&sql, " CREATEDB");
    if (createdb == TRI_NO)
        appendPQExpBufferStr(&sql, " NOCREATEDB");
    if (createrole == TRI_YES)
        appendPQExpBufferStr(&sql, " CREATEROLE");
    if (createrole == TRI_NO)
        appendPQExpBufferStr(&sql, " NOCREATEROLE");
    if (inherit == TRI_YES)
        appendPQExpBufferStr(&sql, " INHERIT");
    if (inherit == TRI_NO)
        appendPQExpBufferStr(&sql, " NOINHERIT");
    if (login == TRI_YES)
        appendPQExpBufferStr(&sql, " LOGIN");
    if (login == TRI_NO)
        appendPQExpBufferStr(&sql, " NOLOGIN");
    if (replication == TRI_YES)
        appendPQExpBufferStr(&sql, " REPLICATION");
    if (replication == TRI_NO)
        appendPQExpBufferStr(&sql, " NOREPLICATION");
    if (conn_limit >= -1)
        appendPQExpBuffer(&sql, " CONNECTION LIMIT %d", conn_limit);
    if (roles.head != NULL)
    {
        SimpleStringListCell *cell;

        appendPQExpBufferStr(&sql, " IN ROLE ");

        for (cell = roles.head; cell; cell = cell->next)
        {
            if (cell->next)
                appendPQExpBuffer(&sql, "%s,", fmtId(cell->val));
            else
                appendPQExpBufferStr(&sql, fmtId(cell->val));
        }
    }
    appendPQExpBufferChar(&sql, ';');

    if (echo)
        printf("%s\n", sql.data);
    result = PQexec(conn, sql.data);

    if (PQresultStatus(result) != PGRES_COMMAND_OK)
    {
        pg_log_error("creation of new role failed: %s", PQerrorMessage(conn));
        PQfinish(conn);
        exit(1);
    }

    PQclear(result);
    PQfinish(conn);
    exit(0);
}


static void
help(const char *progname)
{
    printf(_("%s creates a new PostgreSQL role.\n\n"), progname);
    printf(_("Usage:\n"));
    printf(_("  %s [OPTION]... [ROLENAME]\n"), progname);
    printf(_("\nOptions:\n"));
    printf(_("  -c, --connection-limit=N  connection limit for role (default: no limit)\n"));
    printf(_("  -d, --createdb            role can create new databases\n"));
    printf(_("  -D, --no-createdb         role cannot create databases (default)\n"));
    printf(_("  -e, --echo                show the commands being sent to the server\n"));
    printf(_("  -g, --role=ROLE           new role will be a member of this role\n"));
    printf(_("  -i, --inherit             role inherits privileges of roles it is a\n"
             "                            member of (default)\n"));
    printf(_("  -I, --no-inherit          role does not inherit privileges\n"));
    printf(_("  -l, --login               role can login (default)\n"));
    printf(_("  -L, --no-login            role cannot login\n"));
    printf(_("  -P, --pwprompt            assign a password to new role\n"));
    printf(_("  -r, --createrole          role can create new roles\n"));
    printf(_("  -R, --no-createrole       role cannot create roles (default)\n"));
    printf(_("  -s, --superuser           role will be superuser\n"));
    printf(_("  -S, --no-superuser        role will not be superuser (default)\n"));
    printf(_("  -V, --version             output version information, then exit\n"));
    printf(_("  --interactive             prompt for missing role name and attributes rather\n"
             "                            than using defaults\n"));
    printf(_("  --replication             role can initiate replication\n"));
    printf(_("  --no-replication          role cannot initiate replication\n"));
    printf(_("  -?, --help                show this help, then exit\n"));
    printf(_("\nConnection options:\n"));
    printf(_("  -h, --host=HOSTNAME       database server host or socket directory\n"));
    printf(_("  -p, --port=PORT           database server port\n"));
    printf(_("  -U, --username=USERNAME   user name to connect as (not the one to create)\n"));
    printf(_("  -w, --no-password         never prompt for password\n"));
    printf(_("  -W, --password            force password prompt\n"));
    printf(_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
    printf(_("%s home page: <%s>\n"), PACKAGE_NAME, PACKAGE_URL);
}