Curl ignore ssl certificate error

Make curl ignore certificate errors with a simple addition to the command. Instruct curl to ignore ssl errors and connect to the web server.

Introduction

If you need to make curl ignore certificate errors, make sure you know the consequences of insecure SSL connections and transfers.

You should only practice skipping certificate checks for development purposes.

In this tutorial, you learn how to make curl ignore certificate errors.

How to make curl ignore certificate errors.

The basic syntax for ignoring certificate errors with the curl command is:

curl --insecure [URL]

Alternatively, you can use:

curl -k [URL]
cURL insecure command.

A website is insecure if it has an expired, misconfigured, or no SSL certificate ensuring a safe connection. When you try to use curl to connect to such a website, the output responds with an error.

Note: The --insecure (-k) options is similar to the wget --no-check-certificate command used to avoid certificate authorities checking for a server certificate. To see how wget skips certificate checks, refer to the guide How To Use Wget Command With Examples.

For instance, if you run the command:

curl myawesomewebsite.com

The output should display the content of the URL. However, since this website has an invalid SSL certificate, it shows an error as in the example below.

curl: (60) SSL: no alternative certificate subject name matches target host name 'unixtutorial.test'

This means “peer certificate cannot be authenticated with known CA certificates.”

To bypass this constraint, you can use the --insecure (or -k) option allowing insecure server connections when using SSL. Therefore, you would run:

curl -k myawesomewebsite.com

Conclusion

After reading this article, you should know how to make curl ignore certificate errors. Although this is done simply by adding the -k option, do not instruct curl to ignore SSL errors unless required for development purposes.

Don’t miss out on our other curl guides such as how to set or change user agent with curl and how to send a delete request with curl.

На чтение 3 мин Опубликовано 12.02.2020

Я хотел бы использовать команду curl, чтобы игнорировать предупреждение о сертификатах SSL.

Ведь мы можем получить ошибку подобную этой:

curl: (60) Peer's Certificate issuer is not recognized.
More details here: http://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
of Certificate Authority (CA) public keys (CA certs). If the default
bundle file isn't adequate, you can specify an alternate file
using the --cacert option.

Есть ли в команде curl опция –no-check-certificate ,как например, у команды wget в Linux или Unix-подобной системе?

Вам нужно просто передать параметр -k или –insecure команде curl.

Эта опция явно позволяет curl выполнять «небезопасные» SSL-соединения и передачи данных.

Все SSL-соединения пытаются сделать безопасную передачу данных с помощью пакета сертификатов CA, установленного по умолчанию.

Содержание

  1. Есть ли у curl опция -no-check-certificate, как например, у команд wget на Linux?
  2. cURL | Как игнорировать предупреждения сертификата SSL
  3. Как применить изменения для всех HTTPS-соединений
  4. Как установть доверенный CA  для curl

Есть ли у curl опция -no-check-certificate, как например, у команд wget на Linux?

Следующий синтаксис позволяет команде curl работать с «небезопасными» или «недоверенными» сертификатами SSL:

curl -k url
curl --insecure url
curl --insecure [options] url
curl --insecure -I url

cURL | Как игнорировать предупреждения сертификата SSL

В этом примере отключена проверка сертификата для команды curl:

curl --insecure -I https://202.54.1.2/

или

curl -k -O https://202.54.1.2/file.tar.gz

Без опции -k или –insecure вы получите сообщение об ошибке следующего содержания:

curl: (60) SSL certificate problem: Invalid certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html

curl performs SSL certificate verification by default, using a "bundle"
 of Certificate Authority (CA) public keys (CA certs). If the default
 bundle file isn't adequate, you can specify an alternate file
 using the --cacert option.
If this HTTPS server uses a certificate signed by a CA represented in
 the bundle, the certificate verification probably failed due to a
 problem with the certificate (it might be expired, or the name might
 not match the domain name in the URL).
If you'd like to turn off curl's verification of the certificate, use
 the -k (or --insecure) option.

Вот один полезный пример, где вы сможете получить файл или просмотреть информацию заголовка с удаленного хоста без использования имени домена SNI с поддержкой SSL:

curl -O --insecure --header 'Host: www.example.com' -I https://207.5.1.10/file.html
### или ###
curl -k --header 'Host: www.example.com' -I https://207.5.1.10/file.html

Как применить изменения для всех HTTPS-соединений

Вы можете добавить опцию insecure в ваш файл $HOME/.curlrc:

$ vi $HOME/.curlrc

Сохраните и закройте файл.

Однако я не рекомендую отключать проверки SSL для всех соединений по умолчанию из соображений безопасности.

Как установть доверенный CA  для curl

Можно попробовать следующую команду для самоподписанных сертификатов SSL / TLS:

curl --cacert /pth/to/my/ca.pem https://url
curl --header 'Host: www.cyberciti.biz' --cacert /pth/to/my/ca.pem https://207.5.1.10/nixcraft.tar.gz

Пожалуйста, не спамьте и никого не оскорбляйте.

Это поле для комментариев, а не спамбокс.

Рекламные ссылки не индексируются!

cURL, by default, will ensure each SSL connection is secure by verifying the server’s SSL certificate. You’ll get SSL error when running cURL against https-based websites with SSL certificates that are either misconfigured, expired, or self-signed.

$ curl https://www.example.com/
curl: (51) Unable to communicate securely with peer: requested domain name does not match the server's certificate.

curl: (60) SSL: no alternative certificate subject name matches target host name 'www.example.com'
More details here: https://curl.haxx.se/docs/sslcerts.html

curl: (60) SSL certificate problem: unable to get local issuer certificate
More details here: https://curl.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

You can force cURL to ignore SSL certificate errors by using the insecure option. The option will skip the SSL verification process, and you’ll be able to bypass any SSL error that a site might have while still having SSL-encrypted communication.

Ignoring SSL errors is, of course, not a secure method but is helpful if you trust the website, which may or may not be owned by you. This is equivalent to using —no-check-certificate option in wget.

Steps to disable SSL certificate verification in cURL:

  1. Run curl against website with SSL error.

    $ curl https://www.example.com/
    curl: (51) Unable to communicate securely with peer: requested domain name does not match the server's certificate.
  2. Use insecure option for curl to ignore SSL certificate error.

    $ curl --insecure https://www.example.com/
    <html>
    <head>
    <meta HTTP-EQUIV="REFRESH" content="0; url=/newpage.php">
    </head>
    </html>
    -k, --insecure
           (TLS) By default, every SSL connection curl makes is verified to be secure. This option allows curl to proceed and operate even for server connections otherwise considered insecure.
    
           The server connection is verified by making sure the server's certificate contains the right name and verifies successfully using the cert store.
    
           See this online resource for further details:
            https://curl.haxx.se/docs/sslcerts.html
    
           See also --proxy-insecure and --cacert.
  3. Use shortform insecure option for curl.

    $ curl -k https://www.example.com/
    <html>
    <head>
    <meta HTTP-EQUIV="REFRESH" content="0; url=/newpage.php">
    </head>
    </html>
  4. Add insecure to curl config file to apply the option to every SSL connection.

    $ echo "insecure" >> ~/.curlrc

    Only use this method in development setting or wherever security is not critical.

  5. Test against problematic https website again without specifying insecure option.

    $ curl https://www.example.com/
    <html>
    <head>
    <meta HTTP-EQUIV="REFRESH" content="0; url=/newpage.php">
    </head>
    </html>

Ezoic

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Содержание

  1. 🔑 Как игнорировать ошибки недостоверенных и самоподписанных сертификатов в ssl-соединениях с curl
  2. Есть ли у curl опция -no-check-certificate, как например, у команд wget на Linux?
  3. cURL | Как игнорировать предупреждения сертификата SSL
  4. Как применить изменения для всех HTTPS-соединений
  5. Как установть доверенный CA для curl
  6. ИТ База знаний
  7. Полезно
  8. Навигация
  9. Серверные решения
  10. Телефония
  11. Корпоративные сети
  12. Как заставить curl игнорировать ошибки сертификата
  13. Бесплатный вводный урок на онлайн курс по Linux
  14. Заставить curl игнорировать ошибки SSL
  15. Итоги
  16. Бесплатный вводный урок на онлайн курс по Linux
  17. Полезно?
  18. Почему?
  19. How to Make curl Ignore Certificate Errors
  20. Make curl Ignore SSL Errors
  21. curl Tutorial
  22. Introduction
  23. Install curl
  24. View curl documentation
  25. Basic usage
  26. Common curl options
  27. View verbose output
  28. Save the output as a file
  29. Ignore SSL certificate errors
  30. Compiling curl from source
  31. C++ curl example
  32. Conclusion
  33. Ignoring SSL Certificate Checks with Curl [Python Code]
  34. Python code for Curl Ignore Certificate Checks Example
  35. Curl syntax to ignore certificate validation
  36. Curl SSL Certificate Checks
  37. How to ignore SSL certificate errors using Curl?
  38. Curl example to ignore certificate checks
  39. See also
  40. Generate code snippets for Python and other programming languages

🔑 Как игнорировать ошибки недостоверенных и самоподписанных сертификатов в ssl-соединениях с curl

Я хотел бы использовать команду curl, чтобы игнорировать предупреждение о сертификатах SSL.

Ведь мы можем получить ошибку подобную этой:

Есть ли в команде curl опция –no-check-certificate ,как например, у команды wget в Linux или Unix-подобной системе?

Вам нужно просто передать параметр -k или –insecure команде curl.

Эта опция явно позволяет curl выполнять «небезопасные» SSL-соединения и передачи данных.

Все SSL-соединения пытаются сделать безопасную передачу данных с помощью пакета сертификатов CA, установленного по умолчанию.

Есть ли у curl опция -no-check-certificate, как например, у команд wget на Linux?

Следующий синтаксис позволяет команде curl работать с «небезопасными» или «недоверенными» сертификатами SSL:

cURL | Как игнорировать предупреждения сертификата SSL

В этом примере отключена проверка сертификата для команды curl:

curl —insecure -I https://202.54.1.2/

curl -k -O https://202.54.1.2/file.tar.gz

Вот один полезный пример, где вы сможете получить файл или просмотреть информацию заголовка с удаленного хоста без использования имени домена SNI с поддержкой SSL:

Как применить изменения для всех HTTPS-соединений

Вы можете добавить опцию insecure в ваш файл $HOME/.curlrc:

Как установть доверенный CA для curl

Можно попробовать следующую команду для самоподписанных сертификатов SSL / TLS:

Источник

ИТ База знаний

Курс по Asterisk

Полезно

— Узнать IP — адрес компьютера в интернете

— Онлайн генератор устойчивых паролей

— Онлайн калькулятор подсетей

— Калькулятор инсталляции IP — АТС Asterisk

— Руководство администратора FreePBX на русском языке

— Руководство администратора Cisco UCM/CME на русском языке

— Руководство администратора по Linux/Unix

Навигация

Серверные решения

Телефония

FreePBX и Asterisk

Настройка программных телефонов

Корпоративные сети

Протоколы и стандарты

Как заставить curl игнорировать ошибки сертификата

Если вам нужно заставить curl игнорировать ошибки сертификата, убедитесь, что вы знаете о последствиях небезопасных соединений и передач SSL.

Бесплатный вводный урок на онлайн курс по Linux

Мы собрали концентрат самых востребованных знаний, которые позволят начать карьеру администраторов Linux, расширить текущие знания и сделать уверенный шаг в DevOps

Вам следует практиковаться в пропуске проверки сертификатов только в целях разработки.

В этом руководстве вы узнаете, как заставить curl игнорировать ошибки сертификата.

Заставить curl игнорировать ошибки SSL

Основной синтаксис игнорирования ошибок сертификата с помощью команды curl :

В качестве альтернативы вы можете использовать:

Веб-сайт считается небезопасным, если у него истек срок действия, он неправильно настроен или не имеет сертификата SSL, обеспечивающего безопасное соединение. Когда вы пытаетесь использовать curl для подключения к такому веб-сайту, вывод выдает ошибку.

Примечание. Параметры —insecure (-k) аналогичны команде wget —no-check-certificate , используемой для предотвращения проверки центрами сертификации сертификата сервера.

Например, если вы запустите команду:

Вывод должен отображать содержимое URL-адреса. Однако, поскольку этот веб-сайт имеет недействительный сертификат SSL, он показывает ошибку, как в примере ниже.

Это означает, что «сертификат узла не может быть аутентифицирован с помощью известных сертификатов CA».

Чтобы обойти это ограничение, вы можете использовать параметр —insecure (или — k ), разрешающий небезопасные соединения с сервером при использовании SSL. Следовательно, вы должны запустить:

Итоги

Прочитав эту статью, вы должны знать, как заставить curl игнорировать ошибки сертификата. Хотя это делается просто путем добавления опции -k , не указывайте curl игнорировать ошибки SSL, если это не требуется для целей разработки.

Бесплатный вводный урок на онлайн курс по Linux

Мы собрали концентрат самых востребованных знаний, которые позволят начать карьеру администраторов Linux, расширить текущие знания и сделать уверенный шаг в DevOps

Полезно?

Почему?

😪 Мы тщательно прорабатываем каждый фидбек и отвечаем по итогам анализа. Напишите, пожалуйста, как мы сможем улучшить эту статью.

😍 Полезные IT – статьи от экспертов раз в неделю у вас в почте. Укажите свою дату рождения и мы не забудем поздравить вас.

Источник

How to Make curl Ignore Certificate Errors

Home » DevOps and Development » How to Make curl Ignore Certificate Errors

If you need to make curl ignore certificate errors, make sure you know the consequences of insecure SSL connections and transfers.

You should only practice skipping certificate checks for development purposes.

In this tutorial, you learn how to make curl ignore certificate errors.

Make curl Ignore SSL Errors

The basic syntax for ignoring certificate errors with the curl command is:

Alternatively, you can use:

A website is insecure if it has an expired, misconfigured, or no SSL certificate ensuring a safe connection. When you try to use curl to connect to such a website, the output responds with an error.

Note: The —insecure ( -k ) options is similar to the wget —no-check-certificate command used to avoid certificate authorities checking for a server certificate. To see how wget skips certificate checks, refer to the guide How To Use Wget Command With Examples.

For instance, if you run the command:

The output should display the content of the URL. However, since this website has an invalid SSL certificate, it shows an error as in the example below.

This means “peer certificate cannot be authenticated with known CA certificates.”

To bypass this constraint, you can use the —insecure (or -k ) option allowing insecure server connections when using SSL. Therefore, you would run:

Note: Do you know which type of SSL certificate is best for you? Check out this Ultimate Guide to Types of SSL Certificates.

After reading this article, you should know how to make curl ignore certificate errors. Although this is done simply by adding the -k option, do not instruct curl to ignore SSL errors unless required for development purposes.

Источник

curl Tutorial

Introduction

curl (https://curl.haxx.se/) is an incredibly useful and powerful command-line tool and library. The latest version at the time of this writing is 7.68.0 released January 8, 2020. You can download it from https://curl.haxx.se/download.html and the source code is available at https://github.com/curl/curl.

It’s primary purpose is transferring data over network protocols like HTTP and HTTPS. It supports a large number of other protocols including: FTP, FTPS, Gopher, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, POP3, POP3S, RTMP, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, Telnet and TFTP. It also supports SSL/TLS encryption, cookies, authentication, and proxies.

You can use it as a command-line tool by calling curl or you can use it as a library inside C, C++, or other applications. We will look at several things in this tutorial including:

  • Basic curl usage for making HTTP requests
  • Downloading files
  • Compiling from source
  • Using curl in a C++ application

Install curl

Most Linux distributions come with curl already installed. If not, you can usually use the package manager for your distribution to easily install it. For example, in Ubuntu:

In Windows, you can download the executable from https://curl.haxx.se/download.html or use the Windows Subsystem for Linux (WSL).

Mac users can use the Homebrew formula for curl.

To learn how to build from source, see the «Compiling curl from source» section below.

View curl documentation

You can view the manual page online at https://curl.haxx.se/docs/manpage.html or by running:

You can also view the available flags and options with -h or —help :

Basic usage

By default, curl will make an HTTP request and output the results to standard out (typically the terminal).

Common curl options

When I use curl , there are a few options I find myself using frequently. For example:

  • Viewing verbose output to inspect HTTP headers
  • Saving the output to a file instead of printing to stdout
  • Ignoring SSL certificate errors and self-signed certificates

View verbose output

With the -v or —verbose , curl will output detailed information including the HTTP header information and SSL handshake steps.

Save the output as a file

Use the -o or —output option to tell curl to save the output as a file instead of printing to standard out:

There is another shortcut with a capital O -O . This option will save the file using the name of the file based on the URL. This is handy if you don’t want to specify the name and just have it automatically choose the name. For example, this command will download the file and name it TcpNull-1.0.jar .

Alternatively, but less recommended, you could use redirection to pipe the standard output to a file:

Ignore SSL certificate errors

You can ignore SSL certificate errors by using the -k or —insecure flags which is useful if you have a self-signed certificate.

Compiling curl from source

For compiling, the main files are in the src/ directory. It comes with a CMakeLists.txt file if you want to use CMake. It also comes with a Makefile .

I am using Windows 10 and CMake for my build. If you are using Mac or Linux, CMake can output the appropriate type of build. You simply need to run cmake on the root directory with the CMakeLists.txt file.

It will output several files in whatever directory you are currently in. The primary file of interest is the CURL.sln file which is a Visual Studio solution.

Open the CURL.sln file with Visual Studio (the full Visual Studio, not VS Code). Choose whether you want to build the Debug or Release version and run Build Solution .

If you chose release mode, the .dll file will be located at curllibReleaselibcurl.dll . This is the file you will be linking against when you compile your application that uses curl.

C++ curl example

You will need the compiled libcurl.dll (e.g. curllibReleaselibcurl.dll ) file from the previous build step and the .h files in the include directory curl/include/ .

You can find many examples in C and C++ from the official curl website examples page.

Here is a simple example of making an HTTP request:

This will create an a.exe file that will perform the HTTP request.

Note that you will need to specify the path to the DLL during compile/link time, but after you have the executable, you might need to move the DLL file. The libcurl.dll needs to be in a directory that is in your PATH or in the same directory as the executable.

Conclusion

After following this guide you should know how to install and use curl to perform common tasks like HTTP requests. You should also know how to compile curl from source and use it in a simple C or C++ application.

Источник

Ignoring SSL Certificate Checks with Curl [Python Code]

Python code for Curl Ignore Certificate Checks Example

Curl syntax to ignore certificate validation

The general form of the Curl command to ignore an SSL certificate is as follows:

Curl SSL Certificate Checks

By default, every SSL connection Curl creates checked for security. Every connection is verified by checking that the server certificate is signed by a trusted authority, contains the correct domain name, and has not expired. The Curl Trusted Root Certificate Store comes with a Curl installation and includes a list of CAs and is used to validate server certificates. The -k command-line option allows Curl to continue working on unsecured connections that are otherwise considered insecure and blocked. Use the -k and —insecure options for testing and development purposes only.

How to ignore SSL certificate errors using Curl?

To bypass SSL certificate validation for local and test servers, you can pass the -k or —insecure option to the Curl command. This option explicitly tells Curl to perform «insecure» SSL connections and file transfers. Curl will ignore any security warnings about an invalid SSL certificate and accept it as valid. Your data will continue to be transmitted over an SSL encrypted channel.

Curl example to ignore certificate checks

The following is a Curl example of making an insecure request to expired.badssl.comhost host with the option to ignore SSL certificate errors using the -k or —insecure command-line parameter:

See also

Generate code snippets for Python and other programming languages

Convert your Curl Ignore Certificate Checks request to the PHP, JavaScript/AJAX, Curl/Bash, Python, Java, C#/.NET code snippets using the Python code generator.

Источник

Hello i want to use an API for a website but there an error with my curl command.

I want to disable SSL certificate verification.

curl: (60) SSL certificate problem: self signed certificate in certificate chain
More details here: https://curl.haxx.se/docs/sslcerts.html

curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.

Zach Smith's user avatar

Zach Smith

8,12713 gold badges57 silver badges127 bronze badges

asked Feb 27, 2018 at 15:41

Micky 's user avatar

2

Simply add the -k switch somewhere before the url.

Disclaimer: Use this at your own risk.

man curl | less +/--insecure

-k, —insecure
(TLS) By default, every SSL connection curl makes is verified to be secure. This option allows curl to proceed and operate
even for server connections otherwise considered insecure.

The server connection is verified by making sure the server’s certificate contains the right name and verifies successfully
using the cert store.

See this online resource for further details:
https://curl.haxx.se/docs/sslcerts.html

See also —proxy-insecure and —cacert

Community's user avatar

answered Feb 27, 2018 at 15:46

Gilles Quenot's user avatar

Gilles QuenotGilles Quenot

164k38 gold badges219 silver badges215 bronze badges

4

I am developing and I need to access https://localhost. I know the certificate will not match. I just want curl to ignore that. Currently it gives me the following error message:

curl: (51) SSL peer certificate or SSH remote key was not OK

Is it possible to tell curl to perform the access anyway?

asked Jan 16, 2013 at 23:09

blueFast's user avatar

1

Yeah, you can do that. From curl --help or man curl:

-k, --insecure

(SSL) This option explicitly allows curl to perform «insecure» SSL
connections and transfers. All SSL connections are attempted to be
made secure by using the CA certificate bundle installed by default.
This makes all connections considered «insecure» fail unless -k,
—insecure is used.

See this online resource for further details:
http://curl.haxx.se/docs/sslcerts.html

user524351's user avatar

answered Jan 16, 2013 at 23:11

Mathias R. Jessen's user avatar

7

curl -k or curl --insecure does NOT fix this particular error condition:

curl: (51) SSL peer certificate

Matthias's user avatar

answered Jun 28, 2014 at 21:04

user228425's user avatar

user228425user228425

2012 silver badges2 bronze badges

1

If you truly want to disable curl SSL verification, by default, for ALL use cases, you can do as suggested in this Unix stack exchange answer:

$ echo insecure >> ~/.curlrc

Now should you do this? No, as this is avoiding security checks you should have in place… but if you really really want to do this, caveat emptor!

answered Jul 22, 2020 at 20:15

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Brad ParksBrad Parks

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