Amazon AWS – Experiência de uso

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Olá.

Nos últimos dias venho utilizando o serviço Amazon AWS e preciso dizer uma coisa, é animal.
Ele foi muito bem pensado (até onde percebi), criei um servidor LAMP em poucos minutos, não satisfeito fui usar o banco de dados relacional deles o RDS, sensacional.
A partir dai comecei a brincar a parte de segurança de acesso deles, muito simples, consegui dizer exatamente que porta estava aberta para quais IPs, públicos ou privados com pouco esforço.
Para finalizar minha experiência, fiz alguns testes com o load balancer. Minha primeira experiencia com essa tecnologia fico até sem saber como fazer esse review.

Tudo o que fiz ficou dentro do uso gratuito de 12 meses deles, para saber mais clique aqui.
Nos próximos posts irei demonstrar algumas aplicações que podem ser feitas

Abraço

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Vagrant para ambiente de dev

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Há alguns dias, perdi um bom tempo tendo que acertar algumas configurações para um servidor WAMP. Sim, isso me irritou, pois como rodar um Apache no Ubuntu é mais fácil eu demorei para achar como configurar. Ai eu tinha que configurar um LAMP e depois um WAMP, isso me deixou um pouco irritado, pois eu fiquei pensando, deveria ter algo melhor para fazer isso.

Mas tudo isso é apenas algo trabalhoso que pode ser feito, não chega a ser um grande problema, agora, imagine que a sua aplicação usa PHP, MySQL, Memcached, Redis, MongoDB e para terminar a festa, uma API RestFul feita em Java rodando no Apache Tomcat. Isso para um projeto, agora pense nos inúmeros ambientes que podemos precisar em uma mesma máquina, instalando tudo isso estaríamos sobrecarregando essa máquina, deixando até as tarefas mais simples como responder um e-mail complicadas de serem executadas pela demora na resposta da máquina.
Agora, você poderia ir desativando e ativando os serviços conforme necessário, porem isso também seria trabalhoso. É nesse ponto que entra o Vagrant. Nele podemos subir uma interface mais próxima ao nosso servidor e habilitar e desabilitar ele com apenas um comando. Como nem tudo na vida é fácil, ainda vamos precisar configurar o ambiente, porem isso sera feito apenas uma vez.

Site Vagrant

Vamos agora ao que interessa 🙂

Para o Vagrant funcionar, precisamos ter um gerenciador de máquinas virtuais, o Vagrant suporta VirtualBox, VMware e Hiper-V. Para nosso teste vamos utilizar a VirtualBox, ela pode ser baixada aqui.

Vamos precisar também baixar o Vagrant Aqui.

Depois dele instalado precisamos iniciar o Vagrant em alguma pasta, da mesma forma que fazemos para o git.

vagrant init

Esse comando vai criar o Vagrantfile, esse arquivo sera usado mais a frente para fazer algumas configurações.

O Vagrant, funciona com “boxes”, que são as VMs. No site vagrantbox.es você pode baixar a box que quiser. Eu escolhi a precise32 para demonstrar.

vagrant box add precise32 http://files.vagrantup.com/precise32.box

Ai só esperar baixar e partir para a configuração.

vagrant up

Esse comando ira iniciar a VM.

Quando ela estiver iniciado, basta acessar ela via ssh e configurar da forma que achar melhor.

vagrant ssh

Se por acaso você fizer merda, basta destruir a VM, depois disso basta iniciar e acessar via ssh.

vagrant destroy

Agora vamos configurar o Vagrantfile.


Vagrant.configure(2) do |config|
    config.vm.box = "ubuntu32"

    config.vm.network :forwarded_port, host: 8080, guest: 80
    config.vm.network :forwarded_port, host: 3306, guest: 3306
end

Com essa configuração, estamos fazendo um redirecionamento de portas, apontando as portas do host (minha máquina) para o guest (VM).
Bom, eu não sei muito sobre o Vagrantfile, mas aqui esta a sua documentação.

Até aqui falamos como configurar, subir e bla bla bla. Agora vamos falar sobre o motivo de usarmos o Vagrant e não a VM direto.

A parte interessante do uso do Vagrant é o fato que ele já monta uma unidade de disco “/vagrant” dentro da VM, essa pasta é a mesma que você fez o “vagrant init”.

Se ainda não consegui te convencer, seguem alguns dos meus motivos para usar o Vagrant.

  • Todo o trabalho para instalar uma VM
  • “vagrant destroy” desfaz toda a merda que você fez
  • Redirecionamento de portas de forma simples
  • “vagrant up” tudo funcionando “vagrant halt” seu computador fica limpo
  • Monta uma unidade de disco por padrão

Acho que é isso, escrevi bastante aqui, espero que tenham gostado.

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Dando continuidade ao post sobre integração contínua com FTP (Se não viu segue o link).

Vamos a como resolvi esse meu problema.

Não vou explicar sobre o Git, esse já tem sua documentação fácil.

Começando com o Bitbucket, ative o pipeline, em seu projeto Configurações > Pipelines > Settings (O Bitbucket ainda não fez toda a tradução)

Criei o arquivo bitbucket-pipelines.yml na raiz do projeto, ele é o responsável pela build. Um exemplo simples, apenas rodando o PHPUnit é esse:

Pronto, com isso a cada commit que for feito, o Bitbucket vai disparar a pipeline e com isso gerar o build, com isso vamos ter o seguinte resultado:

Com o processo de build e testes automatizado, podemos pensar no deploy. Para isso usei o DeployBot. Quando criamos o primeiro repositório, o DeployBot faz uma interface passo a passo, mas, como meu plano é o gratuito, só tenho um repositório e ele esta em uso. Vou mostrar as configurações, ai você pode ajustar 🙂

No primeiro passo, criamos o ambiente, no meu caso, apenas produção (no test no fear).

E suas configurações.

Com a configuração de deploy manual, eu preciso mandar fazer o deploy todas as vezes, se esse servidor fosse de QA, facilmente estaria no automático.

Depois de criar o ambiente, é necessário criar os servidores, essa parte é o simples apontamento para onde os arquivos de deploy devem ir.

Configuração de FTP.

No seu cPanel.

Agora que já sabe para onde vai, hora de ajustar as dependências

Outra coisa que podemos fazer aqui, é colocar arquivos com base no ambiente, isso ajuda nas configurações de banco de dados por exemplo.

Essa parte eu não consegui entender bem, mas, em meus testes, sem usar isso a próxima parte da problema…

Aqui ele simplesmente instancia o docker e executa “php -v”, só para saber a versão mesmo, sem segredo.
Essa é a parte da mágica, o DeployBot, só vai executar essa parte caso o composer.json seja alterado, isso é muito bom, pois não vai enviar a pasta vendor sem a necessidade

Agora é só partir para o deploy.

Quando você executa o deploy a primeira vez, ele vai enviar tudo (TUDO) e ficar mais ou menos assim.

Carregando as dependências.Enviando os arquivos.Quando precisar fazer outro deploy, vai enviar apenas a diferença.Aqui, você também pode ver o arquivo de configuração por ambiente foi enviado.

Agora é só curtir 🙂

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Boa tarde.

Fiz um screencast para mostrar como criar um Load Balancer junto com dois servidores a baixo dele rodando apache na estrutura da Amazon AWS. Eu pensei em fazer com screenshots, mas depois de ver que eu já tinha tirando uns 15 e não estava na metada eu desisti.

Espero que esse post ajude vocês. Caso tenham alguma dúvida ou sugestão para outro screencast só deixar nos comentários 🙂

O video não ficou muito bom quando baixei a qualidade para 480p, mas era isso ou nada no vimeo.

Um abraço

Integração contínua com FTP em hospedagem compartilhada

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Deploy via FTP hoje em dia é tipo o Batman, o herói que nós precisamos e não o que queremos.

Nos últimos dias, estou trabalhando em um projeto que não há orçamento disponível, basicamente, minha esposa mandou parar de gastar.

Junto com um amigo, tenho um plano de revenda de hospedagem compartilhada, esse aqui, vendemos esse serviço para outros amigos e por ai vai. Como não há orçamento para esse projeto, estou usando uma cota minha da revenda.

Sendo uma hospedagem compartilhada eu perco diversas coisas, uma delas é o acesso SSH, algumas até disponibilizam, mas a minha experiência com isso não foi das melhores.

Vamos ao ambiente. Como repositório de código eu deixo no Bitbucket, isso porque eu posso criar repositórios privados de graça. Com ele eu uso o serviço de pipeline, também de graça. No pipeline, posso montar da mesma forma como no Trevis CI, um arquivo de configurações e ele se vira para rodar os testes unitários, de aceitação e por ai vai.

O deploy, faço via FTP, sim é muito chato fazer isso, mas tem um cara que resolve esse problema para mim, novamente, DE GRAÇA, ele é o DeployBot, com ele, consigo rodar “composer install” em uma imagem docker e ele gerencia isso para mim, pega os arquivos criados na pasta vendor e encaminha para o servidor, conforme for alterado o composer.json ele vai enviar novamente essa pasta, caso contrário só vai enviar as alteraçõs que estão no commit, esse gerenciamento é o que possibilita o deploy via FTP ser aceitável.

Juntando tudo isso, eu consigo fazer meus deploys de forma fácil, não preciso deixar as dependências no projeto e o melhor, usar efetivamente um FTP, o DeployBot que se vire nisso.

Volto a falar, existem formas melhores de fazer isso, mas o deploy via FTP é uma realidade, vamos deixar isso pelo menos mais fácil.

Assim que terminar eu posto o mão na massa, explicando como eu fiz tudo.

 

[ATUALIZAÇÃO]

Link explicando como foi feito.

Automatizando o não automático

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Aposto que você já ouviu várias pessoas falando sobre a automatização de tarefas no desenvolvimento de software e acredito que seu foco estava no Jenkins, Trevis CI e por ai vai. Depois de algum tempo trabalhando em um projeto que iniciei na empresa onde trabalho, percebi que os projetos open source tinham uma grande contribuição que ia além das ferramentas de CI.

Nos projetos que participei, notei que algumas das informações que eu precisei pedir para alguém, eu simplesmente não precisaria, essa informação poderia estar em algum lugar mais simples do que na mente de alguém, não falo em documentação em si, falo dos itens básicos para que alguém que não faz parte do seu dia a dia possa te ajudar no seu produto.

Imagine o seguinte. Você faz deploy todos os dias no ambiente de QA, ali você coloca diversas alterações de código, você garante que o código que esta ali funciona basicamente com duas coisas, testes manuais para validar aquele teste automatizado que acabou de fazer e testes automatizados, esses para garantir que não quebrou nada. Para “avançar” de ambiente, não há muita diferença, logo o maior trabalho de deploy automatizado esta em QA.

Agora, como resolver problemas de automatização com as coisas que você não precisa fazer todos os dias. Se não se faz todos os dias não precisa ser automatizado, simples, problema resolvido. Só tem um pequeno problema, sua vida não esta ficando mais fácil.

Como você resolve aquele problema de explicar para o cara novo como a banda toca? Um README.md já resolve a maior parte de seus problemas, um CONTIBUTION.md então, nem se fala. Olhe o README.md do Skeleton do ZF2, ele se explica.

Monte uma documentação pensando em alguém que chegou agora no seu time pode fazer um “hello word”, do contrário, toda a vez que uma nova pessoa chegar ela vai precisar falar com você. Ninguem chega alterando o core, simples assim, por conta disso, essa é a documentação que mais precisa ser visível.

Faça isso com um exemplo simples, formate seu computador (ou crie uma VM), você PRECISA conseguir subir seu projeto seguindo apenas a documentação do README.md e do CONTRIBUTION.md, se precisar ir no stack overflow já sabe seu próximo commit. Ou melhor ainda, use o cara novo, tudo o que ele tiver de fazer para rodar o projeto na máquina dele ele coloca na documentação.

Você não automatizou o processo da criação de uma nova máquina de desenvolvimento, mas você automatizou você, seu conhecimento agora esta em um arquivo de fácil leitura (eu acho), agora não é mais necessário chegar até você para iniciar o projeto, essa documentação já resolve o quick start.

Automatizar não é apenas para as tarefas de todo o dia e sim para tarefas repetitivas, sendo elas eventuais ou não. Toda a vez que você automatiza um processo, você reduz possíveis erros operacionais.

Do MD5/SHA-1 para o futuro

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Se o SHA-1 já é considerado não seguro o MD5 eu não preciso nem comentar sobre ele…

Para quem não viu, em fevereiro de 2017, o Google junto com o instituto CWI confirmou a colisão de SHA-1 e fez a publicação da matéria explicando os processos, linkse aqui.

Olhando para esse cenário, é bem interessante (leia-se: melhor fazer) mudar a forma como você esta gerando os hashs de senhas de seus usuários.

Vamos ao cenário proposto. Você tem uma base de usuários que esta toda usando MD5 (ou SHA-1) e não é interessante você enviar um e-mail para todos eles dizendo que eles precisam alterar suas senhas, com isso, você precisa atualizar o hash de senhas de forma transparente.

A forma como o PHP trata as senhas é com as funções “password_” (você pode ler sobre elas Como armazenar as senhas corretamente com PHP e COST do password_hash), estas funções permitem a nós trabalhar com as senhas da forma mais segura possível para o PHP e além disso, sua implimentação correta nos possibilita estar sempre atualizados nas questões de hashs mais seguros.

Como resolver o cenário de uma base com hashs antigos.

A forma como você faz login hoje é mais ou menos dessa forma:

Como o MD5 gera sempre o mesmo hash para o mesmo dado que foi passado, muitos utilizam o MD5 na consulta do MySQL para trazer o usuário que já tem aquele e-mail e senha, se você esta fazendo isso vai precisar alterar para essa forma, pois na hora de verificar a senha precisamos passar a senha que o usuário informou e o hash para a função “password_verify”.

Entendendo como as funções “password_” operam, devemos alterar o código acima para este:

Esse código basicamente faz a mesma validação de MD5, porém quando o usuário é válido para o MD5 ele já faz um novo hash de senha utilizando a “password_hash” e quando não passa no MD5 ainda não quer dizer que falhou o login, ele vai verificar se o hash é o novo e dessa forma validar com “password_verify”, além disso, você pode ver a função “password_needs_rehash”, ela é utilizada para verificar se o hash ainda é válido para as configurações, imagine que nós melhoramos nossa infraestrutura e com isso podemos mudar o valor da opção “cost”, com isso um hash gerado com “cost 10” não é mais válido para um “cost 11” e por conta disso devemos refazer o hash assim melhorando a segurança dele. Isso também é válido para quando mudamos o algorítimo de hash.

Como você pode ver no comentário da validação MD5, esta marcado para remover essa condição, isso porque quando você não tiver mais senhas em MD5 essa condição será inútil.

Agora a última parte, digamos que você deixe esse código por 1 ano em seu sistema e mesmo assim você ainda tem senhas MD5 em sua base de dados, como resolver isso, já que você não quer deixar seus usuários expostos, mesmo aqueles que não utilizam mais seu sistema.

Como me disse o @ericktedeschi. “Deixa assim por um ano e depois faz o reset da senha, se o cara esta a um ano sem entrar no seu sistema ele nem deve lembrar a senha”. É isso, passou muito tempo, de um reset na senha daqueles usuários. Dessa forma você não vai ter a senha deles em MD5.

Isso é tudo. Fazendo a implementação correta das funções “password_”, você esta protegendo seus usuários e ainda fazendo com que novos algoritmos de hash sejam implementados sem alterações estruturais de seu código.

Como armazenar as senhas corretamente com PHP

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Garantir que as senhas dos usuários estão armazenadas corretamente no banco de dados da um certo trabalho, mas assim, ainda não é ciência de foguete, para você usar md5 porque é fácil. Vale lembrar que o md5 não serve para nada e bem no nível do NADA MESMO.

Muitas vezes, a validação de login fica como responsabilidade do banco de dados (Oi? Claro que não, ta louco!).

Quem não fez algo assim (favor ignorar o sql injection):

$sql = “SELECT id FROM user WHERE email=’$email’ AND password=MD5(‘$password’)”;

Você não valida depois se veio uma linha? Então, quem validou foi o banco…

Sendo desse jeito, não temos muito o que fazer. A primeira coisa que precisa ocorrer é alterar quem valida a senha do usuário e isso quem deve fazer é a aplicação.

Nesse contexto, vamos usar as funções de senhas do PHP.

password_hash

password_verify

Conforme manual, password_hash, vai gerar uma senha bem diferente do md5 e se fizer certinho não mexe mais (spoiler, explico no final).

Simples nesse nível:

Agora, o que é o que.

PASSWORD_DEFAULT

É uma constante do PHP que justamente gerencia qual será o algoritimo de criptografia. Ela será alterada caso em uma nova versão do PHP tenha uma forma melhor de criptografia.

cost

É o “custo” daquele hash, quanto maior o custo maior é o tempo para gerar uma senha (explicação prática do cost aqui). Por padrão o cost é 10, logo se eu não passase ele daria na mesma.

Blz, já salvei a senha do meu usuário e tudo mais, agora como eu valido isso?

Pois é, “tudo” isso.

Como bônus, agora vem a parte do corretamente.

O “password_needs_rehash” verifica se o hash usado como senha ainda é o melhor que há disponível.

Pense assim, hoje você esta usando o “cost” 10, mas amanhã vai começar a usar o 11, ou 12, ou o “PASSWORD_DEFAULT” mudou, quando que você vai alterar o hash da senha do usuário? Dessa forma, você já aproveita que você tem a senha do usuário e criptografa ela no novo padrão de hash.

Dessa forma, quando mudar o padrão de criptografia, ou quando você mudar a configuração do “cost” seu código já vai estar preparado para isso e o hash vai ser alterado para o mais novo.

Espero que isso ajude 🙂

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Mão na massa Restful e Zend Framework 2

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Mais uma postagem da séria Mão na massa. Aqui vamos ter uma aplicação Restful usando Zend Framework 2, esse tipo de aplicação é largamente utilizada para criação de APIs e arquitetura SOA.

Particularmente eu gosto do Rest por ele ser simples, acredito que essa seja a maior vantagem dele. Muitas pessoas dizem que ele é pior do que o SOAP por questões de segurança e bla bla bla. Para você ter uma ideia, podemos usar o OAuth no Rest, acredito que isso seja o suficiente para mostrar que é seguro. Outro motivo é o fato de usar Json, eu simplesmente acho mais legal que XML, nada mais a declarar. 🙂

Depois de falar esse monte de besteiras para você, vamos ao escopo dessa mão na massa.
Fazer um sistema que leia um CEP informado e retorne o endereço completo, o retorno deve ser em JSon e XML.
Para isso vamos fazer algo bem tranquilo, vamos apenas retornar o método get($id), com os dados fixos em um array.

Se você não tiver um ambiente pronto, eu recomendo usar o Vagrant, aqui uma postagem sobre ele e uma de como configrar um servidor LAMP. Ou, você pode usar o servidor embutido:

php -S 0.0.0.0:8080 -t public/ public/index.php

Primeiramente vamos montar o ambiente de desenvolvimento usando o Skeleton que a Zend disponibiliza, eu tenho um fork dele na minha conta do github e é ele que vamos usar. Download Skeleton.

Depois de descompactar e deixar pronto para uso, vamos as modificações.

Sempre tenho problemas na versão do PHP, por isso vamos usar o Zend Framework 2.2, precisamos alterar o composer.

Agora vamos executar o composer

php composer.phar install

Assim que ele terminar de executar já podemos consultar o site, no meu caso http://localhost:8080.

restfullsample

Vamos definir que a nossa URL para fazer a consulta de CEP será “/api/cep[.:format]/[:CEP]”. Como exemplos:

http://localhost:8080/api/cep.json/06460000

ou

http://localhost:8080/api/cep.xml/06460000

Para fazer isso, precisamos criar uma rota na nossa aplicação para ela responder por esse endereço.

cepsample/module/Application/config/module.config.php (link GitHub)

return array(
    'router' => array(
        'routes' => array(
        ...
          'cep' => array(
              'type' => 'Segment',
              'options' => array(
                  'route' => '/api/cep[.:format]/[:id]',
                  'constraints' => array(
                      'format' => '(json)',
                  ),
                  'defaults' => array(
                      'controller' => 'Application\Controller\Cep',
                      'format' => 'json',
                  ),
              ),
          ),

No mesmo arquivo, procure o indíce “controllers”, ele deve se parecer com isso

'controllers' => array(
    'invokables' => array(
        'Application\Controller\Index' => 'Application\Controller\IndexController'
    ),
),

E deve ficar assim

'controllers' => array(
    'invokables' => array(
        'Application\Controller\Index' => 'Application\Controller\IndexController',
        'Application\Controller\Cep' => 'Application\Controller\CepController'
    ),
),

Com o redirect pronto, podemos iniciar a construção do método em Rest

No caminho “modules/Application/src/Application/Controller” crie um arquivo chamado “CepController.php”, ele deve ser assim:

Agora quando acessarmos a URL ele vai nos mostrar o array que foi definido no método get($id). Se não passarmos nada depois no CEP na URL, o retorno será em JSon, podemos passar XML também.

restfull_final_sample

Esse código por ser baixado pelo meu GitHub aqui.

Display LCD e potenciometro – Arduino

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Vamos a mais um post sobre Arduino, pois é estou bem empenhado.

A brincadeira é a seguinte.
Vamos multiplicar o valor lido por dois potenciômetros e mostrar o resultado em um LCD. Simples certo.

O LCD que usei é esse aqui e essa é a pinagem dele.

Pino Função Descrição
1 Alimentação GND
2 Alimentação VCC
3 V0 Pino para ajuste do contraste
4 RS 1 = Dado, 0 = Instrução
5 R/W 1 = Leitura, 0 = Escrita
6 E (Chip select) 1 = Habilita, 0 = Desabilita
7 B0 LSB Barramento de dados
8 B1 Barramento de dados
9 B2 Barramento de dados
10 B3 Barramento de dados
11 B4 Barramento de dados
12 B5 Barramento de dados
13 B6 Barramento de dados
14 B7 Barramento de dados
15 A Anodo do LED de backlight
16 K Katodo do LED de backlight

Como montar o LCD

  • Pino 2 do Arduino vai no 14 do display (Pino 14: B7)
  • Pino 3 do Arduino vai no 13 do display (Pino 13: B6)
  • Pino 4 do Arduino vai no 12 do display (Pino 12: B5)
  • Pino 5 do Arduino vai no 11 do display (Pino 11: B4)
  • Pino 11 do Arduino vai no 6 (Enable) do display
  • Pino 12 do Arduino vai no 4 (RS) do display
  • Vcc do Arduino, ligar nos pinos 2 e 15 do display (Pino 2 : Vdd, Pino 15 : A/Vee)
  • GND do Arduino, ligar nos pinos 1, 5 e 16 do display (Pino 1: GND, Pino 5: RW, Pino 16 : 0v (luz de fundo)
  • Ligar pino 3 do display no pino central do potenciômetro, que vai fazer a regulagem do contraste (Pino 3: Vo (Ajuste de contraste)

Agora que foi explicado como devemos fazer a ligação do LCD, segue o schema do projeto.

LCD Potenciômetro Schema

Com o schema montado, é só abrir a Arduino IDE, colocar o código e mandar para o Arduino.

No fim das contas, o projeto ficou assim.
Os dois potenciômetros (esquerda e meio) são os reponsáveis por fornecer os valores para a multiplicação e o da direita gerência o contraste do LCD.

Tudo montado e rodando ficou assim 🙂
Arduino, LCD e Potenciômetro