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OPENSSL-ENV(7SSL) — OpenSSL environment variables

📛 NAME

openssl-env - OpenSSL environment variables

🚀 Quick Reference

Use Case	Command	Description
🔐 Custom SSL CA cert directory	SSL_CERT_DIR	Specify default directory containing CA certificates
🔐 Custom SSL CA cert file	SSL_CERT_FILE	Specify default file containing CA certificates
⚙️ Configuration file path	OPENSSL_CONF	Path to a configuration file
⚙️ Config include directory	OPENSSL_CONF_INCLUDE	Directory for included configuration files
🔌 Dynamic engine directory	OPENSSL_ENGINES	Directory from which dynamic engines are loaded
🧩 Provider directory	OPENSSL_MODULES	Directory from which cryptographic providers are loaded
🪪 CT log list path	CTLOG_FILE	Path to certificate transparency log list
🔧 OpenSSL executable path	OPENSSL	Path to the openssl executable (used by rehash/CA.pl)
🔧 CA.pl config option	OPENSSL_CONFIG	Config option and filename for CA.pl-invoked commands
🔬 Memory allocation debug	OPENSSL_MALLOC_FD / OPENSSL_MALLOC_FAILURES	Debugging memory allocation failures
🔤 Windows UTF-8 support	OPENSSL_WIN32_UTF8	Return UTF-8 encoded strings on Windows
🎲 RNG state file	RANDFILE	State file for random number generator
📡 Timestamping extra args	TSGET	Additional arguments for tsget command
🖥️ CPU feature override	OPENSSL_ia32cap / OPENSSL_sparcv9cap / OPENSSL_ppccap / OPENSSL_armcap / OPENSSL_s390xcap	Control algorithm selection based on processor capabilities
🌐 Proxy settings	NO_PROXY / HTTPS_PROXY / HTTP_PROXY	Specify proxy hostname for HTTP(S) connections

📖 DESCRIPTION

The OpenSSL libraries use environment variables to override the compiled-in default paths for various data. To avoid security risks, the environment is usually not consulted when the executable is set-user-ID or set-group-ID.

• CTLOG_FILE 🪪 — Specifies the path to a certificate transparency log list. See CTLOG_STORE_new(3).
• OPENSSL 🔧 — Specifies the path to the openssl executable. Used by the rehash script (see "Script Configuration" in openssl-rehash(1)) and by the CA.pl script (see "NOTES" in CA.pl(1)).
• OPENSSL_CONF, OPENSSL_CONF_INCLUDE ⚙️ — Specifies the path to a configuration file and the directory for included files. See config(5).
• OPENSSL_CONFIG 🔧 — Specifies a configuration option and filename for the req and ca commands invoked by the CA.pl script. See CA.pl(1).
• OPENSSL_ENGINES 🔌 — Specifies the directory from which dynamic engines are loaded. See openssl-engine(1).
• OPENSSL_MALLOC_FD, OPENSSL_MALLOC_FAILURES 🔬 — If built with debugging, this allows memory allocation to fail. See OPENSSL_malloc(3).
• OPENSSL_MODULES 🧩 — Specifies the directory from which cryptographic providers are loaded. Equivalently, the generic -provider-path command-line option may be used.
• OPENSSL_WIN32_UTF8 🔤 — If set, then UI_OpenSSL(3) returns UTF-8 encoded strings, rather than ones encoded in the current code page, and the openssl(1) program also transcodes the command-line parameters from the current code page to UTF-8. This environment variable is only checked on Microsoft Windows platforms.
• RANDFILE 🎲 — The state file for the random number generator. This should not be needed in normal use. See RAND_load_file(3).
• SSL_CERT_DIR, SSL_CERT_FILE 🔐 — Specify the default directory or file containing CA certificates. See SSL_CTX_load_verify_locations(3).
• TSGET 📡 — Additional arguments for the tsget(1) command.
• OPENSSL_ia32cap, OPENSSL_sparcv9cap, OPENSSL_ppccap, OPENSSL_armcap, OPENSSL_s390xcap 🖥️ — OpenSSL supports a number of different algorithm implementations for various machines and, by default, it determines which to use based on the processor capabilities and run time feature enquiry. These environment variables can be used to exert more control over this selection process. See OPENSSL_ia32cap(3), OPENSSL_s390xcap(3).
• NO_PROXY, HTTPS_PROXY, HTTP_PROXY 🌐 — Specify a proxy hostname. See OSSL_HTTP_parse_url(3).

📜 COPYRIGHT

Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.

3.0.2 — 2026-06-02 — OPENSSL-ENV(7SSL)

OPENSSL-ENV(7SSL) — OpenSSL environment variables 📛 NAME 🚀 Quick Reference 📖 DESCRIPTION 📜 COPYRIGHT