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From caf7ff9935ce26fa3aba404d9003b8fbcfeb391b Mon Sep 17 00:00:00 2001
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From: Sumit Bose <sbose@redhat.com>
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Date: Mon, 17 Sep 2018 17:54:26 +0200
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Subject: [PATCH 40/47] pam_sss: add try_cert_auth option
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With this new option pam_sss can be configured to only do Smartcard
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authentication or return an error if this is not possible.
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Related to https://pagure.io/SSSD/sssd/issue/3650
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Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
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(cherry picked from commit d3a18f06162b9585d2db936472b75fdbff37162d)
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---
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src/man/pam_sss.8.xml | 23 +++++++++++++++++++++++
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src/sss_client/pam_sss.c | 9 +++++++++
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src/sss_client/sss_cli.h | 1 +
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3 files changed, 33 insertions(+)
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diff --git a/src/man/pam_sss.8.xml b/src/man/pam_sss.8.xml
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index d8e6a2041a17814b0ad506170645a5983cc05704..ca2e8e20678d102525a9252678dd83459c3338ac 100644
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--- a/src/man/pam_sss.8.xml
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+++ b/src/man/pam_sss.8.xml
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@@ -50,6 +50,9 @@
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<arg choice='opt'>
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<replaceable>prompt_always</replaceable>
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</arg>
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+ <arg choice='opt'>
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+ <replaceable>try_cert_auth</replaceable>
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+ </arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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@@ -200,6 +203,26 @@ auth sufficient pam_sss.so allow_missing_name
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</para>
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</listitem>
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</varlistentry>
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+ <varlistentry>
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+ <term>
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+ <option>try_cert_auth</option>
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+ </term>
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+ <listitem>
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+ <para>
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+ Try to use certificate based authentication, i.e.
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+ authentication with a Smartcard or similar devices. If a
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+ Smartcard is available and the service is allowed for
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+ Smartcard authentication the use will be prompted for a
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+ PIN and the certificate based authentication will
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+ continue
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+ </para>
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+ <para>
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+ If no Smartcard is available or certificate based
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+ authentication is not allowed for the current service
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+ PAM_AUTHINFO_UNAVAIL is returned.
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+ </para>
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+ </listitem>
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+ </varlistentry>
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</variablelist>
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</refsect1>
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diff --git a/src/sss_client/pam_sss.c b/src/sss_client/pam_sss.c
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index b336d1f6197b09c062dd4ece836e088e52fe7393..96ff15adad867aceae17431cd5256ae52e4b9306 100644
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--- a/src/sss_client/pam_sss.c
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+++ b/src/sss_client/pam_sss.c
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@@ -1997,6 +1997,8 @@ static void eval_argv(pam_handle_t *pamh, int argc, const char **argv,
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*flags |= PAM_CLI_FLAGS_ALLOW_MISSING_NAME;
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} else if (strcmp(*argv, "prompt_always") == 0) {
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*flags |= PAM_CLI_FLAGS_PROMPT_ALWAYS;
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+ } else if (strcmp(*argv, "try_cert_auth") == 0) {
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+ *flags |= PAM_CLI_FLAGS_TRY_CERT_AUTH;
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} else {
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logger(pamh, LOG_WARNING, "unknown option: %s", *argv);
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}
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@@ -2405,6 +2407,13 @@ static int pam_sss(enum sss_cli_command task, pam_handle_t *pamh,
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}
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}
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+ if (flags & PAM_CLI_FLAGS_TRY_CERT_AUTH
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+ && pi.cert_list == NULL) {
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+ D(("No certificates for authentication available."));
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+ overwrite_and_free_pam_items(&pi);
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+ return PAM_AUTHINFO_UNAVAIL;
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+ }
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+
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if (strcmp(pi.pam_service, "gdm-smartcard") == 0) {
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ret = check_login_token_name(pamh, &pi, quiet_mode);
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if (ret != PAM_SUCCESS) {
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diff --git a/src/sss_client/sss_cli.h b/src/sss_client/sss_cli.h
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index 3404715d811332e9013f3f88cb733c62147fb502..38e3f999d799556a56ac08f0f3a6b538b8cde9f3 100644
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--- a/src/sss_client/sss_cli.h
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+++ b/src/sss_client/sss_cli.h
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@@ -373,6 +373,7 @@ enum pam_item_type {
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#define PAM_CLI_FLAGS_USE_2FA (1 << 5)
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#define PAM_CLI_FLAGS_ALLOW_MISSING_NAME (1 << 6)
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#define PAM_CLI_FLAGS_PROMPT_ALWAYS (1 << 7)
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+#define PAM_CLI_FLAGS_TRY_CERT_AUTH (1 << 8)
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#define SSS_NSS_MAX_ENTRIES 256
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#define SSS_NSS_HEADER_SIZE (sizeof(uint32_t) * 4)
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--
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2.14.4
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