使用到这个函数的代码部分：sshd.c里
    if (auth_password(user, "")) {
        ~~~~~~~~~~~~~~~~~~~~~~~
        /* Authentication with empty password succeeded. */
        authentication_type = SSH_AUTH_PASSWORD;
        authenticated = 1;
        /* Success packet will be sent after loop below. */
    } else {
        /* Indicate that authentication is needed. */
        packet_start(SSH_SMSG_FAILURE);
        packet_send();
        packet_write_wait();
    }
和
            /* Try authentication with the password. */
            if (auth_password(user, password)) {
                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                /* Successful authentication. */
                /* Clear the password from memory. */
                memset(password, 0, strlen(password));
                xfree(password);
                log_msg("Password authentication for %.100s accepted.", user);
                authentication_type = SSH_AUTH_PASSWORD;
                authenticated = 1;
                break;
            }
            debug("Password authentication for %.100s failed.", user);
            memset(password, 0, strlen(password));
            xfree(password);
            break;
【 在 sxdxsimple (雾里龙虾) 的大作中提到: 】
: 这段函数的意思是
: 如果密码为空,
: 则判断:如果已经输入的用户名是guest(不分大小写)
: ...................
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FROM 60.4.28.*