15 replies to this topic

[Ocarinha]

Olá!

Como faço um sistema de login com limite de tentativas? Já me falaram para armazenar o número de vezes que o usuário tenta logar no sistema, o ip e o timestamp num banco de dados, até aí tudo bem. O problema é que lan houses, por exemplo, utilizam o mesmo ip para cada máquina e caso o sistema bloqueie um usuário todos os outros com o mesmo ip ficarão sem acesso, por cookie o usuário pode apagá-los e por sessão ela some quando fecha o navegador. Sei que é possível de se fazer isso sem nenhum desses recursos por causa desse site http://www.ccvteam.c...in.php?do=login só não sei como, se alguém puder me ajudar...

[André Manoel]

E aeee!

Então ... a sua dúvida é simples...
Você pode fazer isso de todas as formas que você falou.

Mas a questão é ... você quer bloquear o que? Um login específico?
Se for o login, você terá que usar a sessão e uma conexão com o banco.
Porque se um usuário estiver tentando logar e errar a senha 3 vezes por exemplo, a cada tentativa você pode armazenar o login que ele está tentando usar para logar e quantidade de tentativas.

Se um cara fez 3 vezes com o mesmo login e errou, você conecta no seu banco, atualiza a tabela de usuários com o login desse indivíduo se existir para bloqueado (para isso você pode usar uma flag - bloqueado, desbloqueado - ) e além disso colocar um tempo para que ele possa tentar logar novamente.

Se o cara tentar 3 vezes de um computador e falhar... ele já estará bloqueado no banco.
Então ele pode usar outra máquina de qualquer outro lugar que vai estar bloqueado.

E depois você pode fazer uma verificação para saber se já passou o tempo limite de bloqueio para que ele possa ser bloqueado novamente.

O que vc acha?

[Ocarinha]

Verdade, não tinha pensado nisso, o problema é se outra pessoa digitar o login da pessoa 3 vezes propositalmente, daí independente da senha que ela tentar usar em qualquer pc não vai conseguir depois porque o login já existe no banco. Andei vendo alguns sites aqui e creio que o melhor mesmo é usar captcha assim se ele errar, ao invés de bloquear o ip ou ver o login, ele terá de digitar o código de validação. Vlw André.

Edição feita por: Ocarinha, 27/01/2011, 10:58.

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