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annotate mupdf-source/thirdparty/curl/docs/SSLCERTS.md @ 45:b74429b0f5c4 v1.26.5+1

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+++++ v1.26.5+1
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:13 +0200
parents b50eed0cc0ef
children
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1 SSL Certificate Verification
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2 ============================
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4 SSL is TLS
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5 ----------
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7 SSL is the old name. It is called TLS these days.
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10 Native SSL
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11 ----------
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13 If libcurl was built with Schannel or Secure Transport support (the native SSL
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14 libraries included in Windows and Mac OS X), then this does not apply to
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15 you. Scroll down for details on how the OS-native engines handle SSL
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16 certificates. If you're not sure, then run "curl -V" and read the results. If
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17 the version string says "WinSSL" in it, then it was built with Schannel
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18 support.
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20 It is about trust
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21 -----------------
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23 This system is about trust. In your local CA certificate store you have certs
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24 from *trusted* Certificate Authorities that you then can use to verify that the
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25 server certificates you see are valid. They're signed by one of the CAs you
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26 trust.
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28 Which CAs do you trust? You can decide to trust the same set of companies your
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29 operating system trusts, or the set one of the known browsers trust. That's
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30 basically trust via someone else you trust. You should just be aware that
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31 modern operating systems and browsers are setup to trust *hundreds* of
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32 companies and recent years several such CAs have been found untrustworthy.
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34 Certificate Verification
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35 ------------------------
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37 libcurl performs peer SSL certificate verification by default. This is done
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38 by using a CA certificate store that the SSL library can use to make sure the
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39 peer's server certificate is valid.
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41 If you communicate with HTTPS, FTPS or other TLS-using servers using
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42 certificates that are signed by CAs present in the store, you can be sure
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43 that the remote server really is the one it claims to be.
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45 If the remote server uses a self-signed certificate, if you don't install a CA
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46 cert store, if the server uses a certificate signed by a CA that isn't
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47 included in the store you use or if the remote host is an impostor
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48 impersonating your favorite site, and you want to transfer files from this
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49 server, do one of the following:
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51 1. Tell libcurl to *not* verify the peer. With libcurl you disable this with
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52 `curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);`
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54 With the curl command line tool, you disable this with -k/--insecure.
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56 2. Get a CA certificate that can verify the remote server and use the proper
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57 option to point out this CA cert for verification when connecting. For
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58 libcurl hackers: `curl_easy_setopt(curl, CURLOPT_CAPATH, capath);`
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60 With the curl command line tool: --cacert [file]
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62 3. Add the CA cert for your server to the existing default CA certificate
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63 store. The default CA certificate store can changed at compile time with the
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64 following configure options:
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66 --with-ca-bundle=FILE: use the specified file as CA certificate store. CA
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67 certificates need to be concatenated in PEM format into this file.
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69 --with-ca-path=PATH: use the specified path as CA certificate store. CA
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70 certificates need to be stored as individual PEM files in this directory.
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71 You may need to run c_rehash after adding files there.
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73 If neither of the two options is specified, configure will try to auto-detect
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74 a setting. It's also possible to explicitly not hardcode any default store
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75 but rely on the built in default the crypto library may provide instead.
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76 You can achieve that by passing both --without-ca-bundle and
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77 --without-ca-path to the configure script.
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79 If you use Internet Explorer, this is one way to get extract the CA cert
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80 for a particular server:
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82 - View the certificate by double-clicking the padlock
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83 - Find out where the CA certificate is kept (Certificate>
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84 Authority Information Access>URL)
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85 - Get a copy of the crt file using curl
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86 - Convert it from crt to PEM using the openssl tool:
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87 openssl x509 -inform DES -in yourdownloaded.crt \
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88 -out outcert.pem -text
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89 - Add the 'outcert.pem' to the CA certificate store or use it stand-alone
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90 as described below.
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92 If you use the 'openssl' tool, this is one way to get extract the CA cert
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93 for a particular server:
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95 - `openssl s_client -showcerts -servername server -connect server:443 > cacert.pem`
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96 - type "quit", followed by the "ENTER" key
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97 - The certificate will have "BEGIN CERTIFICATE" and "END CERTIFICATE"
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98 markers.
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99 - If you want to see the data in the certificate, you can do: "openssl
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100 x509 -inform PEM -in certfile -text -out certdata" where certfile is
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101 the cert you extracted from logfile. Look in certdata.
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102 - If you want to trust the certificate, you can add it to your CA
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103 certificate store or use it stand-alone as described. Just remember that
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104 the security is no better than the way you obtained the certificate.
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105
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106 4. If you're using the curl command line tool, you can specify your own CA
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107 cert path by setting the environment variable `CURL_CA_BUNDLE` to the path
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108 of your choice.
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109
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110 If you're using the curl command line tool on Windows, curl will search
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111 for a CA cert file named "curl-ca-bundle.crt" in these directories and in
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112 this order:
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113 1. application's directory
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114 2. current working directory
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115 3. Windows System directory (e.g. C:\windows\system32)
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116 4. Windows Directory (e.g. C:\windows)
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117 5. all directories along %PATH%
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118
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119 5. Get a better/different/newer CA cert bundle! One option is to extract the
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120 one a recent Firefox browser uses by running 'make ca-bundle' in the curl
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121 build tree root, or possibly download a version that was generated this
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122 way for you: [CA Extract](https://curl.haxx.se/docs/caextract.html)
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123
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124 Neglecting to use one of the above methods when dealing with a server using a
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125 certificate that isn't signed by one of the certificates in the installed CA
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126 certificate store, will cause SSL to report an error ("certificate verify
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127 failed") during the handshake and SSL will then refuse further communication
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128 with that server.
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129
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130 Certificate Verification with NSS
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131 ---------------------------------
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132
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133 If libcurl was built with NSS support, then depending on the OS distribution,
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134 it is probably required to take some additional steps to use the system-wide
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135 CA cert db. RedHat ships with an additional module, libnsspem.so, which
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136 enables NSS to read the OpenSSL PEM CA bundle. On openSUSE you can install
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137 p11-kit-nss-trust which makes NSS use the system wide CA certificate store. NSS
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138 also has a new [database format](https://wiki.mozilla.org/NSS_Shared_DB).
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139
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140 Starting with version 7.19.7, libcurl automatically adds the 'sql:' prefix to
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141 the certdb directory (either the hardcoded default /etc/pki/nssdb or the
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142 directory configured with SSL_DIR environment variable). To check which certdb
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143 format your distribution provides, examine the default certdb location:
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144 /etc/pki/nssdb; the new certdb format can be identified by the filenames
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145 cert9.db, key4.db, pkcs11.txt; filenames of older versions are cert8.db,
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146 key3.db, secmod.db.
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147
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148 Certificate Verification with Schannel and Secure Transport
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149 -----------------------------------------------------------
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150
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151 If libcurl was built with Schannel (Microsoft's native TLS engine) or Secure
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152 Transport (Apple's native TLS engine) support, then libcurl will still perform
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153 peer certificate verification, but instead of using a CA cert bundle, it will
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154 use the certificates that are built into the OS. These are the same
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155 certificates that appear in the Internet Options control panel (under Windows)
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156 or Keychain Access application (under OS X). Any custom security rules for
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157 certificates will be honored.
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158
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159 Schannel will run CRL checks on certificates unless peer verification is
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160 disabled. Secure Transport on iOS will run OCSP checks on certificates unless
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161 peer verification is disabled. Secure Transport on OS X will run either OCSP
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162 or CRL checks on certificates if those features are enabled, and this behavior
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163 can be adjusted in the preferences of Keychain Access.
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164
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165 HTTPS proxy
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166 -----------
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167
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168 Since version 7.52.0, curl can do HTTPS to the proxy separately from the
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169 connection to the server. This TLS connection is handled separately from the
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170 server connection so instead of `--insecure` and `--cacert` to control the
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171 certificate verification, you use `--proxy-insecure` and `--proxy-cacert`.
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172 With these options, you make sure that the TLS connection and the trust of the
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173 proxy can be kept totally separate from the TLS connection to the server.