forked from pool/util-linux
Stanislav Brabec
b2359319b4
- Implement escape code for printing of ssh host keys in agetty issue file (util-linux-agetty-ssh-host-keys.patch. - Include fixes from https://github.com/util-linux/util-linux/pull/3649 (jsc#PED-8734, util-linux-lib-netlink.patch, util-linux-agetty-netlink.patch). OBS-URL: https://build.opensuse.org/request/show/1302271 OBS-URL: https://build.opensuse.org/package/show/Base:System/util-linux?expand=0&rev=598
112 lines
2.8 KiB
Diff
112 lines
2.8 KiB
Diff
From 275a215e3ee02d8240d22b2bc61abcdd6b24c35f Mon Sep 17 00:00:00 2001
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From: Stanislav Brabec <sbrabec@suse.cz>
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Date: Fri, 8 Aug 2025 02:39:28 +0200
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Subject: [PATCH] agetty: Implement \k: print ssh host keys
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Implement new keyword \k that will print all ssh host keys.
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Signed-off-by: Stanislav Brabec <sbrabec@suse.cz>
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---
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term-utils/agetty.8.adoc | 3 +++
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term-utils/agetty.c | 56 ++++++++++++++++++++++++++++++++++++++++
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2 files changed, 59 insertions(+)
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diff --git a/term-utils/agetty.8.adoc b/term-utils/agetty.8.adoc
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index 6670498f5..f84ec2e1e 100644
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--- a/term-utils/agetty.8.adoc
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+++ b/term-utils/agetty.8.adoc
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@@ -304,6 +304,9 @@ Insert the string "1 user" or "<n> users" where <n> is the number of current use
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v::
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Insert the version of the OS, that is, the build-date and such.
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+k::
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+Print host ssh keys.
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+
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An example. On my system, the following _/etc/issue_ file:
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....
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diff --git a/term-utils/agetty.c b/term-utils/agetty.c
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index c37417e1e..d53882ef7 100644
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--- a/term-utils/agetty.c
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+++ b/term-utils/agetty.c
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@@ -33,6 +33,7 @@
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#include <grp.h>
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#include <pwd.h>
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#include <netdb.h>
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+#include <glob.h>
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#include <sys/utsname.h>
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#include "strutils.h"
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@@ -2706,6 +2707,58 @@ static void dump_iface_all(struct issue *ie,
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fputs("\n", ie->output);
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}
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+#define SSH_KEYGEN_BUFFER_SIZE 512
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+void print_ssh_keys(FILE *fd) {
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+ glob_t glob_result;
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+ int rc;
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+
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+ rc = glob("/etc/ssh/ssh_host_*_key.pub", 0, NULL, &glob_result);
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+ if (rc != 0) {
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+ if (rc == GLOB_NOMATCH) {
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+ fprintf(fd, _("No SSH host keys found.\n"));
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+ }
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+ globfree(&glob_result);
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+ return;
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+ }
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+
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+ for (size_t i = 0; i < glob_result.gl_pathc; i++) {
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+ int pipefd[2];
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+ pid_t pid;
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+
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+ if (pipe(pipefd) == -1) {
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+ continue;
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+ }
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+ pid = fork();
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+ if (pid == -1) {
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+ close(pipefd[0]);
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+ close(pipefd[1]);
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+ continue;
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+ }
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+ if (pid == 0) {
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+ char *argv[] = {"ssh-keygen", "-l", "-f", glob_result.gl_pathv[i], NULL};
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+
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+ close(pipefd[0]);
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+ dup2(pipefd[1], STDOUT_FILENO);
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+ close(pipefd[1]);
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+ execvp("ssh-keygen", argv);
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+ return;
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+ } else {
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+ char buffer[SSH_KEYGEN_BUFFER_SIZE];
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+
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+ close(pipefd[1]);
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+ wait(NULL);
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+ if (fgets(buffer, sizeof(buffer), fdopen(pipefd[0], "r")) != NULL) {
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+ char field2[SSH_KEYGEN_BUFFER_SIZE], field4[SSH_KEYGEN_BUFFER_SIZE];
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+ if (sscanf(buffer, "%*s %s %*s %s", field2, field4) == 2) {
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+ fprintf(fd, _("SSH host key: %s %s\n"), field2, field4);
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+ }
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+ }
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+ close(pipefd[0]);
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+ }
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+ }
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+ globfree(&glob_result);
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+ return;
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+}
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/*
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* parses \x{argument}, if not argument specified then returns NULL, the @fd
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* has to point to one char after the sequence (it means '{').
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@@ -2944,6 +2997,9 @@ static void output_special_char(struct issue *ie,
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}
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break;
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#endif
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+ case 'k':
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+ print_ssh_keys(ie->output);
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+ break;
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default:
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putc(c, ie->output);
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break;
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--
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2.48.1
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